Fatigue test device for liquid hydrogen dewar

Abstract

The utility model relates to a fatigue test device for liquid hydrogen dewar. Include: content container simulation spare, outer container simulation spare, neck pipe, driver, crankshaft and connecting rod, content container simulation spare is used for simulating the real content container after being filled with set liquid, outer container simulation spare is used for supporting neck pipe and content container simulation spare, outer container simulation spare is set in the outside of content container simulation spare, one end of neck pipe is connected with the top end of content container simulation spare, and the other end is connected with the top end inner wall of outer container simulation spare, one end of crankshaft is connected with driver, and the other end is connected with connecting rod, the other end of connecting rod is connected with the side of content container simulation spare, and the connecting position is the center of mass position after the real content container plus set liquid, driver is used for driving crankshaft to do reciprocating rotation, and crankshaft is used for driving connecting rod to do reciprocating motion in horizontal direction to push content container simulation spare to swing in the set direction. The application has high test efficiency and low cost.

Description

Technical Field

[0001] This utility model relates to the field of cryogenic technology, and in particular to a fatigue testing device for liquid hydrogen Dewar. Background Technology

[0002] A liquid hydrogen Dewar comprises an outer shell, a neck tube, an inner liner, and insulation materials. The neck tube connects the outer shell and inner liner, forming a crucial component. A liquid hydrogen Dewar is a container holding liquid hydrogen at 20K. Due to the extremely low storage temperature, heat leakage through the neck tube must be minimized to reduce the static evaporation rate. Simultaneously, the liquid hydrogen Dewar must be impact-resistant to ensure safety during transportation, requiring sufficient strength and rigidity from the neck tube. Since the leakage rate requirement of the neck tube contradicts the strength and rigidity of its structure, selecting appropriate neck tube diameter, wall thickness, and material is crucial for the performance and safety of the liquid hydrogen Dewar.

[0003] Currently, most Dewar products are designed based on practical experience to select wall thickness, length and material. After the product is manufactured, vibration tests are conducted according to testing standards. If problems occur during the test, the neck tube is disassembled and returned to the factory for repair. The testing costs are high and seriously affect the product development progress.

[0004] Therefore, there is an urgent need to provide a fatigue testing device for liquid hydrogen Dewars to solve the above-mentioned technical problems. Utility Model Content

[0005] This invention provides a fatigue testing device for liquid hydrogen Dewar, which has high testing efficiency and low cost.

[0006] One embodiment of this utility model provides a fatigue testing device for a liquid hydrogen Dewar, comprising: an inner container simulation component, an outer container simulation component, a neck tube, a driver, a crankshaft, and a connecting rod; the inner container simulation component is used to simulate a real inner container after being filled with a set liquid, and the outer container simulation component is used to support the neck tube and the inner container simulation component;

[0007] The outer container simulation component is fitted over the inner container simulation component. One end of the neck tube is connected to the top of the inner container simulation component, and the other end is connected to the inner wall of the top of the outer container simulation component. One end of the crankshaft is connected to the driver, and the other end is connected to the connecting rod. The other end of the connecting rod is connected to the side of the inner container simulation component, and the connection position is the center of mass of the actual inner container after the set liquid is added.

[0008] The driver is used to drive the crankshaft to perform reciprocating rotation, and the crankshaft is used to drive the connecting rod to perform reciprocating horizontal motion, so as to push the inner container simulation component to swing in a set direction.

[0009] In one possible design, the swing amplitude of the connecting rod is equal to the distance between the vacuum interlayer at the center of the actual inner container and the actual outer container.

[0010] In one possible design, the oscillation amplitude, oscillation frequency, and oscillation time of the inner container simulation element are determined according to the test standards of actual vibration tests.

[0011] In one possible design, the driver is a motor.

[0012] In one possible design, the speed, rotation time, and power of the motor are determined based on the oscillation frequency, oscillation time, and oscillation amplitude of the inner container simulation element.

[0013] In one possible design, a first connecting plate is also included for connecting the outer container simulator and the neck tube;

[0014] The end of the neck tube away from the inner container simulation component is welded to the first connecting plate, and the top end of the outer container simulation component is connected to the first connecting plate by bolts.

[0015] In one possible design, a second connecting plate and a third connecting plate are also included;

[0016] One end of the second connecting plate is connected to the end of the connecting rod away from the crankshaft, and the other end is connected to the third connecting plate by bolts. The other end of the third connecting plate is connected to the inner container simulation component.

[0017] In one possible design, a bracket is also included; the driver is fixed to the bracket.

[0018] This invention provides a fatigue testing device for a liquid hydrogen Dewar. In this embodiment, firstly, since the connection position between the connecting rod and the inner container simulation component is equal to the center of mass of the actual inner container plus the set liquid, the inner container simulation component is completely equivalent to the actual inner container. Therefore, testing can be conducted without manufacturing the actual inner container, thus not affecting the production cycle and saving costs. Then, by setting components such as a motor, crankshaft, and connecting rod, the inner container simulation component can be driven to swing in a set direction, thereby stretching the neck tube, causing it to bend and spring back under tension, completing the fatigue test. Based on the test results, it is determined whether the diameter, material, and wall thickness of the neck tube meet the requirements. If not, the neck tube parameters can be changed and the test repeated, which is convenient and quick. Therefore, this application can verify the neck tube design in a short period, obtain the optimal neck tube model, accelerate the entire product development cycle, and reduce subsequent testing costs. Attached Figure Description

[0019] 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.

[0020] Figure 1 This is a schematic diagram of the fatigue testing device for a liquid hydrogen container provided in an embodiment of the present invention.

[0021] Figure label:

[0022] 1-Inner container simulation component; 2-Outer container simulation component; 3-Neck tube; 4-Driver; 5-Crankshaft; 6-Connecting rod;

[0023] 7-First connecting plate; 8-Second connecting plate; 9-Third connecting plate; 10-Bolt; 11-Bracket. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0025] like Figure 1 As shown, this utility model embodiment provides a fatigue testing device for a liquid hydrogen Dewar, comprising an inner container simulation component 1, an outer container simulation component 2, a neck tube 3, a driver 4, a crankshaft 5, and a connecting rod 6; the inner container simulation component 1 is used to simulate the real inner container after being filled with a set liquid, and the outer container simulation component 2 is used to support the neck tube and the inner container simulation component;

[0026] The outer container simulation component 2 is fitted onto the outside of the inner container simulation component 1. One end of the neck tube 3 is connected to the top of the inner container simulation component 1, and the other end is connected to the inner wall of the top of the outer container simulation component 2. One end of the crankshaft 5 is connected to the driver 4, and the other end is connected to the connecting rod 6. The other end of the connecting rod 6 is connected to the side of the inner container simulation component 1, and the connection position is the center of mass position of the real inner container after adding the set liquid.

[0027] The driver 4 is used to drive the crankshaft 5 to perform reciprocating rotation, and the crankshaft 5 is used to drive the connecting rod 6 to perform horizontal reciprocating motion, so as to push the inner container simulation component 1 to swing in a set direction.

[0028] In this embodiment, firstly, since the connection position between the connecting rod 6 and the inner container simulation component 1 is equal to the center of mass of the actual inner container plus the set liquid, the inner container simulation component 1 can be completely equivalent to the actual inner container. Therefore, the test can be carried out without manufacturing the actual inner container, thus not affecting the production cycle and saving costs. Then, by setting components such as the motor, crankshaft 5, and connecting rod 6, the inner container simulation component 1 can be driven to swing in a set direction, thereby pulling the neck tube 3, causing the neck tube 3 to bend and spring back under tension, completing the fatigue test. Based on the test results, it is determined whether the diameter, material, and wall thickness of the neck tube 3 meet the requirements. If they do not meet the requirements, the parameters of the neck tube 3 can be changed and the test repeated, which is convenient and quick. Therefore, this application can verify the neck tube 3 scheme in a short period of time, obtain the optimal neck tube 3 model, accelerate the entire product development cycle, and reduce subsequent testing costs.

[0029] It should be noted that the inner container simulation component 1 can be a cylinder, box, or steel plate, as long as its center of mass is equivalent to the actual center of mass of the real inner container plus the set liquid. The outer container simulation component 2 is used to simulate the supporting function of the real outer container and can be a frame fixed to the ground or platform, as long as it can stably support the neck tube 3 and the inner container simulation component 1. This application does not specifically limit the shape and material of the inner container simulation component 1 and the outer container simulation component 2. In addition, the distance between the top of the outer container simulation component 2 and the top of the inner container simulation component 1 is equal to the length of the real neck tube 3.

[0030] In some implementations, the swing amplitude of link 6 is equal to the distance between the vacuum interlayer at the center of the actual inner container and the actual outer container.

[0031] In this step, since the limit of the inner container's swing when a real liquid hydrogen Dewar is in use is the collision between its wall and the wall of the outer container, that is, its maximum swing amplitude is the distance between the vacuum interlayers at the center of the liquid hydrogen Dewar, it is necessary to limit the swing amplitude of the inner container simulation component 1 during the experiment to make it close to the actual vibration test and ensure the accuracy of the test results.

[0032] In some implementations, the oscillation amplitude, oscillation frequency, and oscillation time of the inner container simulator 1 are determined according to the test standards of the actual vibration test. By making the test conditions consistent with the actual test standards, the accuracy of the test results is ensured.

[0033] In some embodiments, the driver 4 is a motor. The motor's speed, rotation time, and power are determined based on the oscillation frequency, oscillation time, and oscillation amplitude of the inner container simulation element 1.

[0034] Of course, the driver 4 can also be a hydraulic cylinder mechanism, etc., and this application does not make specific limitations.

[0035] In some embodiments, a first connecting plate 7 is also included for connecting the outer container simulator 2 and the neck tube 3;

[0036] The end of the neck tube 3 away from the inner container simulation part 1 is welded to the first connecting plate 7, and the top of the outer container simulation part 2 is connected to the first connecting plate 7 by bolts 10.

[0037] In this step, by setting the first connecting plate 7 and connecting the first connecting plate 7 to the outer container simulation part 2 with bolts 10, it is easy to disassemble for subsequent testing of other models of neck tube 3.

[0038] In some embodiments, a second connecting plate 8 and a third connecting plate 9 are also included;

[0039] One end of the second connecting plate 8 is connected to the end of the connecting rod 6 away from the crankshaft 5, and the other end is connected to the third connecting plate 9 by bolt 10. The other end of the third connecting plate 9 is connected to the inner container simulation component 1.

[0040] In this step, by setting a second connecting plate 8 and a third connecting plate 9, and connecting the second connecting plate 8 and the third connecting plate 9 with bolts 10, it is easy to disassemble for subsequent testing of other models of neck tube 3.

[0041] In some embodiments, a bracket 11 is also included; the driver 4 is fixed to the bracket 11. By setting the bracket 11, it is convenient to select appropriate crankshaft 5 and connecting rod 6 lengths, the footprint is small, and it is convenient to adjust the working angle.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0043] Finally, it should be noted that the above description is only a preferred embodiment of this utility model and is used only to illustrate the technical solution of this utility model, and is not intended to limit the protection scope of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model are included within the protection scope of this utility model.

Claims

1. A fatigue testing device for a liquid hydrogen Dewar, characterized in that, include: The inner container simulater (1), the outer container simulater (2), the neck tube (3), the driver (4), the crankshaft (5), and the connecting rod (6); the inner container simulater (1) is used to simulate the real inner container after being filled with a set liquid, and the outer container simulater (2) is used to support the neck tube (3) and the inner container simulater (1); The outer container simulation component (2) is sleeved on the outside of the inner container simulation component (1). One end of the neck tube (3) is connected to the top of the inner container simulation component (1), and the other end is connected to the inner wall of the top of the outer container simulation component (2). One end of the crankshaft (5) is connected to the driver (4), and the other end is connected to the connecting rod (6). The other end of the connecting rod (6) is connected to the side of the inner container simulation component (1), and the connection position is the center of mass position of the real inner container after the set liquid is added. The driver (4) is used to drive the crankshaft (5) to perform reciprocating rotation, and the crankshaft (5) is used to drive the connecting rod (6) to perform reciprocating horizontal motion, so as to push the inner container simulation component (1) to swing in a set direction.

2. The fatigue testing apparatus according to claim 1, characterized in that, The swing amplitude of the connecting rod (6) is the distance between the vacuum interlayer at the center of the real inner container and the real outer container.

3. The fatigue testing apparatus according to claim 1, characterized in that, The swing amplitude, swing frequency and swing time of the inner container simulation component (1) are determined according to the test standards of the actual vibration test.

4. The fatigue testing apparatus according to claim 1, characterized in that, The driver (4) is a motor.

5. The fatigue testing apparatus according to claim 4, characterized in that, The speed, rotation time and power of the motor are determined based on the oscillation frequency, oscillation time and oscillation amplitude of the inner container simulation component (1).

6. The fatigue testing apparatus according to claim 1, characterized in that, It also includes a first connecting plate (7) for connecting the outer container simulator (2) and the neck tube (3); The neck tube (3) is welded to the first connecting plate (7) at one end away from the inner container simulation (1), and the top end of the outer container simulation (2) is connected to the first connecting plate (7) by bolts (10).

7. The fatigue testing apparatus according to claim 1, characterized in that, It also includes a second connecting plate (8) and a third connecting plate (9); One end of the second connecting plate (8) is connected to the end of the connecting rod (6) away from the crankshaft (5), and the other end is connected to the third connecting plate (9) by bolts (10). The other end of the third connecting plate (9) is connected to the inner container simulation component (1).

8. The fatigue testing apparatus according to claim 1, characterized in that, It also includes a bracket (11); the driver (4) is fixed to the bracket (11).

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