Zero-consumption liquid nitrogen tank, pressure calculation method and manufacturing method

Abstract

The invention discloses a zero-consumption liquid nitrogen tank, a pressure calculation method and a manufacturing method, and the method comprises the steps: setting a closed space in the liquid nitrogen tank, and filling the space with quantitative liquid nitrogen; s1, calculating the actual pressure of the closed space in the liquid nitrogen tank at the given temperature; s2, performing pressure correction based on the liquid nitrogen proportion to obtain a pressure correction coefficient; and S3, performing target pressure calculation by using the pressure correction coefficient. The liquid nitrogen filling device has the beneficial effects that the proper amount of liquid nitrogen is filled in a balanced mode according to the calculated pressure intensity borne by the tank body, the optimal effect under the condition that safety is guaranteed is achieved, and the problems that the effect is poor due to too little filling and hidden dangers exist due to too much filling are solved; and the liquid nitrogen can be used for a whole life only by adding the liquid once, so that the use cost of the liquid nitrogen is greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of sample storage, and in particular to a zero-consumption liquid nitrogen tank, a pressure calculation method and a manufacturing method. Background Art

[0002] In the field of biological sample storage, cryogenic storage and retrieval equipment is used to store biological samples such as blood samples, vaccines, bacteria and virus strains at low temperatures, so that the samples are kept in a low temperature state and preserved active.

[0003] Currently, the cooling device used is liquid nitrogen cooling, but each liquid nitrogen tank has a large demand for liquid nitrogen every day, and the consumed liquid nitrogen vaporizes and escapes. The wasted liquid nitrogen cannot be recycled, which increases a lot of costs.

[0004] However, in some closed liquid nitrogen bottles, if the amount of liquid nitrogen filled in is too little, the effect will be poor, and if the amount of liquid nitrogen filled in is too much, there will be a potential danger of excessive pressure. For this reason, the inventor has designed a zero-consumption liquid nitrogen tank, a pressure calculation method and a manufacturing method. Summary of the invention

[0005] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0006] In view of the above problems or problems existing in the prior art, the present invention is proposed.

[0007] Therefore, the purpose of the present invention is to provide a method for calculating the pressure of a liquid nitrogen tank, which can solve the problem that the liquid nitrogen consumed by the existing liquid nitrogen tank evaporates and escapes, and the wasted liquid nitrogen cannot be recycled, which increases a lot of costs. The tank body is light and convenient to use. The corresponding pressure calculation method can obtain the most suitable liquid nitrogen filling amount of the liquid nitrogen bottle, preventing the problem of poor effect due to too little filling and hidden dangers due to too much filling.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions: a method for calculating the pressure of a liquid nitrogen tank, comprising providing a closed space in the liquid nitrogen tank, and filling the space with a certain amount of liquid nitrogen;

[0009] S1: Calculate the actual pressure of the enclosed space in the liquid nitrogen tank at a given temperature;

[0010] S2: Based on the proportion of liquid nitrogen, perform pressure correction to obtain a pressure correction coefficient;

[0011] S3: Calculate the target pressure using the pressure correction coefficient.

[0012] As a preferred solution of the method for calculating the pressure of the liquid nitrogen tank of the present invention, wherein: S1 adopts the vapor pressure function: P = Pc·exp(∑(Ni·Θti)·Tc / T);

[0013] Where P represents vapor pressure; Pc represents critical pressure; Ni and ti represent constants and exponents of liquid nitrogen; Tc represents the critical temperature of liquid nitrogen; T represents absolute temperature, and θ is the temperature correction coefficient.

[0014] As a preferred solution of the method for calculating the pressure of a liquid nitrogen tank of the present invention, the temperature correction coefficient is calculated as follows: Θ=1-Tc / T.

[0015] As a preferred solution of the method for calculating the pressure of a liquid nitrogen tank of the present invention, the target pressure calculation formula is: Pi=k·P; wherein Pi represents the pressure; k represents the pressure correction coefficient.

[0016] As a preferred solution of the method for calculating the pressure of a liquid nitrogen tank of the present invention, the parameters Ni and ti of the liquid nitrogen can be obtained through experimental data.

[0017] As a preferred solution of the method for calculating the pressure of a liquid nitrogen tank of the present invention, the pressure correction coefficient k is a value obtained based on the pressure at different temperatures after different liquid nitrogen proportions.

[0018] The present invention also provides a zero-consumption liquid nitrogen tank, which can contain liquid nitrogen through a tank body. When the temperature in the tank rises, the liquid nitrogen is gasified, and when the temperature drops, the nitrogen is liquefied again, so that liquid nitrogen is circulated, thereby achieving one-time liquid addition and lifelong use, saving a large amount of liquid nitrogen and greatly reducing costs; the tank body is small in size, and refrigeration and cooling are carried out by conducting temperature to the outside, so it can be applied to a variety of usage scenarios, is easy to take out, and can be recycled.

[0019] In order to achieve the above technical effects, the present invention also provides the following technical solution: comprising a tank body, a sealed area is formed in the tank body, the sealed area is filled with liquid nitrogen, and the liquid nitrogen is filled in an amount according to the pressure that the tank body can withstand obtained by the liquid nitrogen tank pressure calculation method.

[0020] As a preferred solution of the zero-consumption liquid nitrogen tank of the present invention, a refrigeration cycle component is arranged on the tank body, which can cool and liquefy the vaporized nitrogen in the tank body, and a heat preservation component is arranged on the refrigeration cycle component, which can keep the refrigeration cycle component warm.

[0021] As a preferred solution of the zero-consumption liquid nitrogen tank of the present invention, the refrigeration cycle component includes a refrigeration component and a liquefaction component; the liquefaction component is connected to the refrigeration component, the refrigeration component can cool the liquefaction component, and the liquefaction component can liquefy nitrogen.

[0022] As a preferred solution of the zero-consumption liquid nitrogen tank of the present invention, the liquefier is arranged at the upper end of the tank body and inside the heat preservation assembly.

[0023] As a preferred solution of the zero-consumption liquid nitrogen tank of the present invention, the insulation component includes a vacuum insulation layer; the interior of the vacuum insulation layer is vacuum, and the vertical circumference of the vacuum insulation layer is arranged on the outer side of the upper end of the tank body.

[0024] As a preferred solution of the zero-consumption liquid nitrogen tank of the present invention, the heat-insulating component further comprises an extraction member; the extraction member is arranged on the vacuum heat-insulating layer, and the extraction member can extract the gas inside the vacuum heat-insulating layer.

[0025] As a preferred solution of the new elderly walking assistance vehicle of the present invention, a sealing piece is also provided on the tank body, and liquid nitrogen can enter the interior of the tank body through the sealing piece, and the sealing piece can seal the tank body.

[0026] The present invention also provides a method for manufacturing a zero-consumption liquid nitrogen tank. The method can realize the manufacturing process of the zero-consumption liquid nitrogen tank and ensure the sealing and stability of the liquid nitrogen tank.

[0027] In order to realize the manufacturing process of the liquid nitrogen tank, the present invention also provides a method for manufacturing a zero-consumption liquid nitrogen tank, including a zero-consumption liquid nitrogen tank, and the following manufacturing method,

[0028] D1: The tank body is welded and sealed;

[0029] D2: The upper end of the tank is sealed and connected to the liquefied component, and the liquefied component is connected to the refrigeration component;

[0030] D3: Install a vacuum insulation layer on the upper part of the tank and wrap the liquefied parts;

[0031] D4: Use the extraction component to extract the gas inside the vacuum insulation layer, so that the vacuum insulation layer can keep the liquefied component cool;

[0032] D5: Open the plugging piece and inject a quarter of liquid nitrogen into the tank;

[0033] D6: Seal the plugging piece and the tank body.

[0034] The beneficial effect of the liquid nitrogen tank pressure calculation method of the present invention is that an appropriate amount of liquid nitrogen is evenly filled in according to the pressure that the tank body can withstand, so as to achieve the optimal effect under the condition of ensuring safety, and prevent the problem of poor effect caused by filling too little and hidden dangers caused by filling too much.

[0035] The beneficial effects of the zero-consumption liquid nitrogen tank of the present invention are as follows: 1. The tank body contains liquid nitrogen, and the liquid nitrogen is gasified when the temperature in the tank rises. When the temperature drops, the nitrogen is liquefied again, so that the liquid nitrogen is circulated, so that the liquid is added once and used for life, which saves a lot of liquid nitrogen and greatly reduces the cost. 2. The tank body is small in size, and can be used in a variety of usage scenarios by conducting the temperature to the outside for refrigeration and cooling. It is convenient to take and recycle. 3. The liquefied part, the rear end of the liquefied part can be connected to the external refrigeration part to liquefy the part for refrigeration. The front end of the liquefied part is set in a fin shape, which can increase the contact area with the gas in the tank body, and the refrigeration rate is faster. At the same time, it is convenient for the gaseous liquid nitrogen to flow downward from the fin after low-temperature liquefaction. 4. A vacuum insulation layer is arranged around the upper end of the tank body, which can prevent the refrigeration of the liquefied part in the tank body from diffusing from the side to the outside, thereby reducing energy consumption. 5. A plugging part is arranged at the lower end of the tank body. When the plugging part is opened, liquid nitrogen can be injected, and it is sealed after completion to ensure the sealing and stability of the tank body.

[0036] The beneficial effects of the zero-consumption liquid nitrogen tank manufacturing method of the present invention are as follows: the tank body can be sealed by the manufacturing method, and the gas inside the vacuum insulation layer can be extracted by using the extraction component, so that the vacuum insulation layer can keep the liquefied component cold; one quarter of liquid nitrogen is injected into the interior according to the volume of the tank body, and the sealing component is sealed and connected to the tank body through the sealing component, thereby ensuring the sealing and stability of the liquid nitrogen tank, and realizing that the liquid is added once and it can be used for life. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0038] Figure 1 Experimental data for the calculation method of liquid nitrogen tank pressure.

[0039] Figure 2 This is the pressure calculation curve of the liquid nitrogen tank pressure calculation method.

[0040] Figure 3 This is a step-by-step diagram for calculating the pressure of a liquid nitrogen tank.

[0041] Figure 4 This is a three-dimensional schematic diagram of a zero-consumption liquid nitrogen tank.

[0042] Figure 5 This is a cross-sectional view of the tank body of a zero-consumption liquid nitrogen tank.

[0043] Figure 6 for Figure 5 Enlarged view of F1 of the zero-consumption liquid nitrogen tank.

[0044] Figure 7 for Figure 5 Enlarged view of F2 of the zero-consumption liquid nitrogen tank.

[0045] Figure 8 This is a cross-sectional view of the overall structure of the zero-consumption liquid nitrogen tank.

[0046] Fig. 9 Schematic diagram of the steps for making a zero-consumption liquid nitrogen tank.

[0047] Reference numerals: tank body, 1; refrigeration cycle component, 2; insulation component, 3; refrigeration component, 21; liquefaction component, 22; vacuum insulation layer, 31; extraction component, 32; blocking component, 4; DETAILED DESCRIPTION

[0048] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0049] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0050] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0051] Example 1

[0052] Reference Figures 1 to 3 , which is the first embodiment of the present invention, and provides a method for calculating the pressure of a liquid nitrogen tank, comprising setting a closed space in the liquid nitrogen tank, and filling the space with a certain amount of liquid nitrogen;

[0053] S1: Calculate the actual pressure of the enclosed space in the liquid nitrogen tank at a given temperature;

[0054] S2: Based on the proportion of liquid nitrogen, perform pressure correction to obtain a pressure correction coefficient;

[0055] S3: Calculate the target pressure using the pressure correction coefficient.

[0056] Preferably, a temperature is set and then the actual pressure of the enclosed space in the liquid nitrogen tank is calculated; the pressure is corrected according to the proportion of liquid nitrogen in the liquid nitrogen tank, thereby obtaining a pressure correction coefficient; through the above operation, a calculation formula method for the new pressure, i.e., the target pressure, is obtained, and the calculation of the target pressure is realized. Through this calculation method, it can be obtained how much liquid nitrogen should be put in different liquid nitrogen tanks to achieve the best effect.

[0057] It should be noted that we need to combine the percentage of liquid nitrogen in the enclosed space and the pressure at different temperatures to form a pressure calculation formula. We can assume that the percentage of liquid nitrogen in the enclosed space will affect the vapor pressure, and we need to ensure that at any given temperature, the pressure does not exceed the safe threshold.

[0058] Furthermore, the vapor pressure function is used in S1: P = Pc·exp(∑(Ni·Θti)·Tc / T);

[0059] Where P represents vapor pressure; Pc represents critical pressure; Ni and ti represent constants and exponents of liquid nitrogen; Tc represents the critical temperature of liquid nitrogen; T represents absolute temperature, and θ is the temperature correction coefficient.

[0060] Preferably, using the vapor pressure function, we can calculate the actual pressure at a given temperature. For example, the pressure at +20°C, -135°C, and -147°C;

[0061] Furthermore, the temperature correction coefficient is calculated: Θ = 1-Tc / T.

[0062] Furthermore, the target pressure calculation formula is: Pi = k·P; wherein Pi represents pressure; k represents a pressure correction coefficient.

[0063] Furthermore, the parameters Ni and ti of liquid nitrogen can be obtained through experimental data.

[0064] Furthermore, the pressure correction factor k is a value obtained based on the pressure at different temperatures after different liquid nitrogen percentages.

[0065] It should be noted that the pressure correction coefficient k is a value obtained based on different liquid nitrogen proportions. The pressure correction coefficient is different at different temperatures and is obtained through experiments.

[0066] It should be noted that according to the known conditions;

[0067] The critical temperature of liquid nitrogen is Tc: -146.958°C (converted to Kelvin is 126.2K);

[0068] The critical pressure of liquid nitrogen is Pc = 3.3958 MPa;

[0069] Liquid nitrogen parameters Ni,ti: experimentally obtained N1 = 1, t1 = 0.3;

[0070] The pressure calculation process of the closed space when it is stable at +20℃, -135℃, and -147℃ (as follows), the closed space, liquid nitrogen with a volume ratio of 23%, stable state -190℃ (83.15K)) closed; the density value is 188Kg / m 3 ;

[0071] It should be noted that the pressure calculation process at +20°C is as follows:

[0072] Pressure calculation process when the closed space is stable at +20℃, closed space, liquid nitrogen accounts for 23% of the volume, stable state -190℃ (83.15K)) closed; density value is 188Kg / m 3 ;

[0073] The parameters of liquid nitrogen Ni,ti, are obtained through experimental calculation, N1=1, t1=0.3

[0074] Adjustment coefficient k: k = 4.077, obtained through experiments;

[0075] Temperature: T = 293.15K (+20°C)

[0076] Calculate Θ:

[0077] Θ=1-T / Tc=1-293.15 / 126.2≈0.58

[0078] Calculate the vapor pressure P:

[0079] P=Pc·exp(N1·Θt1·Tc / T)

[0080] P=3.3958exp[1·(0.58)0.3·126.2 / 293.15]

[0081] exp[1·(0.58)0.3·126.2 / 293.15]≈exp(0.479·0.43)≈exp(0.2062)≈1.2295

[0082] P≈3.3958·1.2295≈4.1751MPa

[0083] Calculate the pressure Pi:

[0084] Pi=k·P=4.077·4.1751=17.022MPa≈17MPa.

[0085] It should be noted that the pressure at -135°C is calculated as follows:

[0086] The critical temperature of liquid nitrogen is Tc: -146.958°C (converted to Kelvin is 126.2K);

[0087] The critical pressure of liquid nitrogen is Pc = 3.3958 MPa

[0088] Temperature: T = 138.15K

[0089] The parameters of liquid nitrogen Ni,ti, are obtained through experimental calculation, N1 = 1, t1 = 0.3

[0090] K = 0.769, obtained by experiment;

[0091] Calculate Θ:

[0092] Θ=1-T / Tc=1-138.15 / 126.2≈0.087

[0093] Calculate the vapor pressure P:

[0094] P=Pc·exp(N1·Θt1·Tc / / T)

[0095] P=3.3958·exp(1·0.0870.3·126.2 / 138.15)

[0096] exp(1·0.48·0.913)≈exp(0.439)≈1.552;

[0097] P≈3.3958·1.552≈5.27MPa

[0098] Calculate the pressure Pi:

[0099] Pi = K·P;

[0100] Pi=0.769·5.27≈4.053MPa≈4MPa

[0101] Calculation of safe pressure at -147℃

[0102] The critical temperature of liquid nitrogen is Tc: -146.958°C (converted to Kelvin is 126.2K);

[0103] The critical pressure of liquid nitrogen is Pc = 3.3958 MPa

[0104] Temperature: T = 126.15K (-147°C)

[0105] Liquid nitrogen parameters Ni,ti, constant N1 = 1, index t1 = 0.3

[0106] K = 0.884, obtained by experiment;

[0107] Calculate Θ:

[0108] Θ = 1-T / Tc = 0.0004 at the critical point;

[0109] Calculate the pressure Pi: Pi = k·P

[0110] Pi=k·Pc exp[∑(Ni·Θti)·Tc / T]=0.884·3.3958·exp[∑(Ni·Θti)·Tc / T]

[0111] exp[∑(Ni·Θti)·Tc / T]≈[1·(0.0004)0.3·126.2 / 126.15]≈1.00006

[0112] P=0.13·1.00006=0.130006

[0113] Pi=0.884·3.3958·1.00006≈3.002MPa≈3MPa

[0114] Based on the above calculations, it is shown how to use the physical properties of liquid nitrogen and the environmental conditions to estimate the pressure inside a container at a certain liquid nitrogen percentage at a specific temperature.

[0115] It should be noted that according to calculations, when there is about one-quarter of the volume of liquid nitrogen in the tank, the pressure generated by vaporization has the lowest impact on the strength and service life of the tank, and will not cause any safety hazards.

[0116] In summary, the liquid nitrogen tank pressure calculation method of the present invention achieves the optimal effect while ensuring safety by calculating the pressure that the tank can withstand and filling in an appropriate amount of liquid nitrogen in a balanced manner, thereby preventing the problem of poor effect due to filling too little and hidden dangers due to filling too much.

[0117] Example 2

[0118] Reference Figures 3 to 8 , which is the second embodiment of the present invention, is based on embodiment 1 and further provides a zero-consumption liquid nitrogen tank including a tank body 1, a sealed area is formed in the tank body 1, and the sealed area is filled with liquid nitrogen, and the liquid nitrogen is filled with the amount of liquid nitrogen according to the pressure that the tank body 1 can withstand obtained by the liquid nitrogen tank pressure calculation method according to any one of claims 1-6.

[0119] Preferably, liquid nitrogen is disposed inside the tank body 1 , and the tank body 1 can be ultra-low temperature cooled, and the sample can be ultra-low temperature frozen through the tank body 1 .

[0120] Furthermore, a refrigeration cycle component 2 is provided on the tank body 1, and the refrigeration cycle component 2 can cool and liquefy vaporized nitrogen in the tank body 1. A heat preservation component 3 is provided on the refrigeration cycle component 2, and the heat preservation component 3 can keep the refrigeration cycle component 2 warm.

[0121] Preferably, liquid nitrogen can be vaporized in the tank body 1, and the nitrogen can be liquefied by using the refrigeration cycle component 2. The liquid nitrogen is circulated and vaporized inside the tank body 1 and then liquefied by the refrigeration cycle component 2, so that the liquid nitrogen can be circulated only once, which greatly reduces the cost of using liquid nitrogen.

[0122] Furthermore, the refrigeration cycle assembly 2 includes a refrigeration component 21 and a liquefaction component 22; the liquefaction component 22 is connected to the refrigeration component 21, the refrigeration component 21 can cool the liquefaction component 22, and the liquefaction component 22 can liquefy nitrogen.

[0123] Preferably, the refrigeration element 21 is a Stirling refrigerator, which can perform cyclic refrigeration on the liquefaction element 22. The temperature of the vaporized nitrogen can be reduced through the liquefaction element 22, so that the nitrogen can be converted into liquid nitrogen.

[0124] Preferably, the bottom of the liquefied component 22 is configured to be fin-shaped, which can increase the contact area between the nitrogen and the liquefied component 22 and make the liquefaction speed faster.

[0125] Furthermore, the liquefier 22 is disposed at the upper end of the tank body 1 and inside the heat preservation assembly 3 .

[0126] Preferably, by arranging the liquefier 22 at the upper end of the tank body 1, it is convenient to liquefy the rising nitrogen, and the liquid nitrogen after liquefaction will flow into the tank body 1 again, thus realizing a cyclic conversion.

[0127] Furthermore, the insulation component 3 includes a vacuum insulation layer 31 ; the interior of the vacuum insulation layer 31 is vacuum, and the vacuum insulation layer 31 is vertically circumferentially arranged on the outer side of the upper end of the tank body 1 .

[0128] Preferably, the vacuum insulation layer 31 can prevent the cooling of the liquefied component 22 in the tank from spreading to the outside from the side, thereby reducing energy consumption.

[0129] Furthermore, the thermal insulation component 3 also includes an extraction member 32 ; the extraction member 32 is disposed on the vacuum thermal insulation layer 31 , and the extraction member 32 can extract the gas inside the vacuum thermal insulation layer 31 .

[0130] Preferably, the gas in the vacuum insulation layer 31 can be evacuated by providing an extraction member 32 so that the vacuum insulation layer 31 remains vacuum.

[0131] Furthermore, a sealing member 4 is provided on the tank body 1 , through which liquid nitrogen can enter the tank body 1 , and the sealing member 4 can seal the tank body 1 .

[0132] Preferably, the tank body 1 can be sealed by the plugging member 4; when the plugging member 4 is in the open state, liquid nitrogen can be injected into the tank body 1. After the liquid nitrogen is injected, the plugging member 4 is sealed with the tank body 1 and is in an undetachable state.

[0133] In summary, the present invention contains liquid nitrogen through the tank body 1, and the temperature in the tank increases to gasify the liquid nitrogen. The nitrogen can be liquefied through the refrigeration cycle component 2, so as to circulate the liquid nitrogen, so as to achieve one-time liquid addition and lifelong use, saving a large amount of liquid nitrogen and greatly reducing the cost; the tank body 1 is small in size, and can be used in various usage scenarios by conducting refrigeration to the external temperature, which is convenient to take and can be recycled; the rear end of the liquefied component 22 can be connected to the refrigeration component 21, and the front end of the liquefied component 22 is configured to be fin-shaped, which can increase the contact area with the gas in the tank body, and the refrigeration rate is faster, and at the same time, it is convenient for the gaseous liquid nitrogen to flow downward from the fin after low-temperature liquefaction; a vacuum insulation layer 31 is arranged around the upper end of the tank body 1, which can prevent the refrigeration of the liquefied component 22 in the tank body from diffusing from the side to the outside, thereby reducing energy consumption; liquid nitrogen is injected into the tank body from the lower end injection port, and is sealed by the plugging component 4 after injection, and the plugging component 4 is supported by the sealing material to ensure the sealing and stability of the tank body 1.

[0134] Example 3

[0135] Reference Fig. 9 , which is the third embodiment of the present invention, based on Embodiment 1 and Embodiment 2, further provides a method for manufacturing a zero-consumption liquid nitrogen tank, including the following manufacturing method,

[0136] D1: Tank body 1 is welded and sealed;

[0137] D2: The upper end of the tank body 1 is sealed and connected to the liquefier 22, and the liquefier 22 is connected to the refrigeration element 21;

[0138] D3: The vacuum insulation layer 31 is placed on the upper part of the tank body 1 and wraps the liquefied component 22;

[0139] D4: The gas inside the vacuum insulation layer 31 is extracted by the extraction member 32, so that the vacuum insulation layer 31 keeps the liquefied member 22 cool;

[0140] D5: Open the plugging piece 4 and inject a quarter of liquid nitrogen into the tank body 1;

[0141] D6: The blocking member 4 is sealed and connected to the tank body 1.

[0142] In summary, the tank body 1 can be sealed through this manufacturing method, and the gas inside the vacuum insulation layer 31 can be extracted by the extraction part 32, so that the vacuum insulation layer 31 can keep the liquefied part 22 cold; according to the volume of the tank body, one quarter of liquid nitrogen is injected into the interior, and the sealing part 4 is used to seal the tank body 1 to ensure the sealing and stability of the liquid nitrogen tank, so that it can be used for life after adding liquid once.

[0143] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0144] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0145] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0146] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for calculating the pressure of a liquid nitrogen tank, characterized in that: A closed space is provided in a liquid nitrogen tank, and a fixed amount of liquid nitrogen is filled into the space; S1: Calculate the actual pressure of the enclosed space in the liquid nitrogen tank at a given temperature; S2: Based on the proportion of liquid nitrogen, perform pressure correction to obtain a pressure correction coefficient; S3: Calculate the target pressure using the pressure correction coefficient.

2. The method for calculating the pressure of a liquid nitrogen tank according to claim 1, wherein: The vapor pressure function is used in S1: P = Pc·exp(∑(Ni·Θti)·Tc / T); Where P represents the vapor pressure; Pc represents the critical pressure; Ni and ti represent the constant and exponent of liquid nitrogen; Tc represents the critical temperature of liquid nitrogen; T represents the absolute temperature, and θ is the temperature correction coefficient.

3. The method for calculating the pressure of a liquid nitrogen tank according to claim 2, wherein: Calculate the temperature correction coefficient: Θ = 1-Tc / T.

4. The method for calculating the pressure of a liquid nitrogen tank according to claim 3, wherein: The target pressure calculation formula is: Pi = k·P; Pi represents the pressure; k represents the pressure correction coefficient.

5. The method for calculating the pressure of a liquid nitrogen tank according to claim 4, characterized in that: The parameters Ni and ti of liquid nitrogen can be obtained through experimental data.

6. The method for calculating the pressure of a liquid nitrogen tank according to claim 4, characterized in that: The pressure correction factor k is a value obtained based on the pressure at different temperatures after different liquid nitrogen percentages.

7. A zero-consumption liquid nitrogen tank, characterized in that: The invention comprises a tank body (1), wherein a sealed area is formed in the tank body (1), wherein the sealed area is filled with liquid nitrogen, and the liquid nitrogen is filled in an amount corresponding to a pressure that the tank body (1) can withstand obtained by the method for calculating the pressure of a liquid nitrogen tank according to any one of claims 1 to 6.

8. The zero-consumption liquid nitrogen tank according to claim 7, characterized in that: The tank body (1) is provided with a refrigeration cycle component (2), and the refrigeration cycle component (2) can cool and liquefy vaporized nitrogen in the tank body (1); the refrigeration cycle component (2) is provided with a heat preservation component (3), and the heat preservation component (3) can keep the refrigeration cycle component (2) warm.

9. The zero-consumption liquid nitrogen tank according to claim 8, characterized in that: The refrigeration cycle component (2) comprises a refrigeration component (21) and a liquefaction component (22); the liquefaction component (22) is connected to the refrigeration component (21); the refrigeration component (21) can cool the liquefaction component (22); and the liquefaction component (22) can liquefy nitrogen.

10. The zero-consumption liquid nitrogen tank according to claim 9, characterized in that: The liquefaction component (22) is arranged at the upper end of the tank body (1) and is arranged inside the heat preservation component (3).

11. The zero-consumption liquid nitrogen tank according to claim 10, characterized in that: The heat-insulating component (3) comprises a vacuum heat-insulating layer (31); the interior of the vacuum heat-insulating layer (31) is vacuum, and the vacuum heat-insulating layer (31) is vertically circumferentially arranged on the outer side of the upper end of the tank body (1).

12. The zero-consumption liquid nitrogen tank according to claim 11, characterized in that: The heat-insulating component (3) further comprises an extraction member (32); the extraction member (32) is arranged on the vacuum heat-insulating layer (31), and the extraction member (32) can extract the gas inside the vacuum heat-insulating layer (31).

13. The zero-consumption liquid nitrogen tank according to claim 12, characterized in that: The tank body (1) is also provided with a sealing member (4), through which liquid nitrogen can enter the interior of the tank body (1), and the sealing member (4) can seal the tank body (1).

14. A method for manufacturing a zero-consumption liquid nitrogen tank, characterized in that: The invention comprises the zero-consumption liquid nitrogen tank as claimed in claim 13, and the following manufacturing method: D1: The tank body (1) is welded and sealed; D2: The upper end of the tank body (1) is sealed and connected to the liquefier (22), and the liquefier (22) is connected to the refrigeration element (21); D3: a vacuum insulation layer (31) is placed on the upper part of the tank body (1) and wraps the liquefied component (22); D4: extracting gas from the vacuum insulation layer (31) using the extraction member (32), so that the vacuum insulation layer (31) keeps the liquefied member (22) cool; D5: Open the plugging piece (4) and inject a quarter of liquid nitrogen into the tank body (1); D6: The sealing member (4) is connected to the tank body (1) in a sealed manner.

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