Hydrogen sealing structure of in-situ hydrogen low-temperature mechanical testing machine system

Abstract

The utility model provides a kind of in-situ hydrogen low-temperature mechanical testing machine system hydrogen sealing structure including test seal assembly and vacuum cavity neck pipe flange, wherein: test seal assembly includes test seal flange, seal ring compression flange and air inlet pipe, test seal flange center is provided with test movable pull rod, and test seal flange is provided with one seal ring compression flange in the upper and lower sides respectively, and with test movable pull rod, test seal flange seal adheres, test seal flange bottom and vacuum cavity neck pipe flange adhere seal, and test seal flange inside is provided with air inlet channel;Test seal flange bottom and the seal of vacuum cavity neck pipe flange, the seal of test movable pull rod, the seal of test seal flange, air inlet pipe connects air inlet channel, the utility model utilizes air inlet pipe and passes into high-purity micro-positive pressure nitrogen in seal place by air inlet channel, can strengthen the seal of seal place, isolate internal hydrogen and external oxygen.

Description

Technical Field

[0001] This utility model relates to the field of low-temperature sealing technology, and in particular to a hydrogen sealing structure for an in-situ hydrogen-contaminated low-temperature mechanical testing machine system. Background Technology

[0002] The in-situ hydrogen-containing cryogenic mechanical testing system requires the test component to be immersed in liquid hydrogen. Since the liquid hydrogen needs to be stored in a vacuum container to maintain its temperature, the test sample is immersed in liquid hydrogen, and the pull rod and reaction rod to be tested are also assembled in the vacuum chamber.

[0003] Vacuum containers for storing liquid hydrogen are typically sealed by welding. However, in-situ cryogenic mechanical testing machines for hydrogen require the installation of test specimens. The specimens are placed inside the vacuum chamber, and a movable pull rod applies tension. Therefore, after the test specimens are installed, a pre-assembled flange is needed to seal the top. The top flange also needs to pass through the movable pull rod for sealing. Since hydrogen is a relatively reactive gas with the smallest molecular weight and is prone to explosion, it is necessary to achieve both dynamic and static sealing of the hydrogen at the flange and the movable pull rod on the container. In particular, it is necessary to ensure the dynamic sealing of the container to guarantee the safety of the hydrogen container. Utility Model Content

[0004] To address the issue of dynamic sealing during testing, this invention proposes a hydrogen sealing structure for an in-situ hydrogen-exposed low-temperature mechanical testing machine system.

[0005] This utility model is achieved through the following technical solution: This utility model proposes an in-situ hydrogen-sealed structure for a cryogenic mechanical testing system, comprising a test sealing component and a vacuum chamber neck flange, wherein: The test sealing assembly includes a test sealing flange, a sealing ring clamping flange, and an air inlet pipe. A test movable pull rod is provided at the center of the test sealing flange. The sealing ring clamping flange is provided on both the upper and lower sides of the test sealing flange and is sealed and fitted with the test movable pull rod and the test sealing flange. The bottom of the test sealing flange is fitted and sealed with the neck flange of the vacuum chamber. An air inlet channel is provided inside the test sealing flange. The sealing points at the bottom of the test sealing flange and the neck flange of the vacuum chamber, the sealing points of the test movable pull rod, the sealing points of the test sealing flange, and the air inlet pipe connecting to the air inlet channel.

[0006] Furthermore, the test sealing assembly also includes a first sealing ring, with at least two first sealing rings disposed between the test sealing flange and the vacuum chamber neck flange. The test sealing flange and the vacuum chamber neck flange press the first sealing rings to complete the seal, and the air inlet channel side is located between the two first sealing rings.

[0007] Furthermore, the test sealing assembly also includes a second sealing ring. Two second sealing rings are disposed on the upper and lower sides of the test sealing flange, and the second sealing rings are in contact with the test sealing flange, the sealing ring clamping flange, and the test movable pull rod. The test sealing flange, the sealing ring clamping flange, and the test movable pull rod together compress the second sealing ring to complete the seal. The other side of the air inlet channel is located between the two sealing rings.

[0008] Furthermore, the first sealing ring is an O-ring.

[0009] Furthermore, the second sealing ring is an X-shaped sealing ring.

[0010] Furthermore, a test reaction support rod is provided at the bottom of the test sealing flange, and the test reaction support rod is fixedly connected to the test sealing flange.

[0011] Furthermore, the test sealing assembly also includes a fixing screw, which passes through a flat washer and a spring washer in sequence and fixes the sealing ring compression flange to the test sealing flange.

[0012] Furthermore, plugs are provided on both sides of the test sealing flange, and the plugs seal one side of the air intake channel.

[0013] The beneficial effects of this utility model are: (1) The hydrogen sealing structure of the in-situ hydrogen-exposed low-temperature mechanical testing machine system proposed in this utility model utilizes the air inlet pipe to introduce high-purity micro-positive pressure nitrogen into the sealing area through the air inlet channel, which can strengthen the sealing of the sealing area and isolate the internal hydrogen from the external oxygen.

[0014] (2) The hydrogen sealing structure of the in-situ hydrogen-exposed low-temperature mechanical testing machine system proposed in this utility model has two first sealing rings and two second sealing rings. The two sealing rings provide double sealing, and at the same time, the air inlet channel introduces micro-positive pressure high-purity nitrogen between the two sealing rings, which can enhance the sealing and isolate oxygen in the external air. Attached Figure Description

[0015] Figure 1 This is a structural diagram of the hydrogen sealing structure of the in-situ hydrogen-exposed low-temperature mechanical testing machine system of this utility model; Figure 2 This is a schematic diagram of the sealing principle of the hydrogen sealing structure of the in-situ hydrogen-exposed low-temperature mechanical testing machine system of this utility model; In the diagram: 1. Vacuum chamber neck flange; 2. Test sealing flange; 3. Sealing ring clamping flange; 4. Inlet pipe; 5. Test movable tie rod; 6. Inlet air passage; 7. First sealing ring; 8. Second sealing ring; 9. Fixing screw; 10. Plug; 11. Test reaction support rod.

[0016] The purpose, features, and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0017] To more clearly and completely illustrate the technical solution of this utility model, the following description, in conjunction with the accompanying drawings, will further explain this utility model.

[0018] Please refer to Figures 1-2 This utility model proposes an in-situ hydrogen-sealed structure for a cryogenic mechanical testing system, comprising a test sealing component and a vacuum chamber neck flange 1, wherein: The test sealing assembly includes a test sealing flange 2, a sealing ring clamping flange 3, and an air inlet pipe 4. A test movable pull rod 5 is provided in the center of the test sealing flange 2. Sealing ring clamping flanges 3 are provided on the upper and lower sides of the test sealing flange 2, and are sealed and fitted with the test movable pull rod 5 and the test sealing flange 2. The bottom of the test sealing flange 2 is fitted and sealed with the vacuum chamber neck flange 1. An air inlet channel 6 is provided inside the test sealing flange 2. Test the seal between the bottom of the sealing flange 2 and the vacuum chamber neck flange 1, test the seal of the movable pull rod 5, test the seal of the sealing flange 2, and connect the air inlet pipe 4 to the air inlet channel 6.

[0019] In a specific implementation, the vacuum chamber neck flange 1 is connected to the vacuum container. The test sealing flange 2 is used for the installation of static planar seal and dynamic circumferential (test movable pull rod 5) seal after the test sample is installed. The test movable pull rod 5 passes through the test sealing flange 2 and extends into the vacuum chamber to pull the sample. The bottom of the test sealing flange 2 is sealed to the vacuum chamber neck flange 1. The inner side of the test sealing flange 2 is sealed to the sealing ring clamping flange 3 and the test movable pull rod 5. The inlet channel 6 is cross-shaped. The number of inlet channels 6 and inlet pipes 4 can be selected according to the actual situation. For example, one inlet channel 6 is set on each of the left and right sides of the test sealing flange 2. At the same time, an inlet pipe 4 is set on each inlet channel. The transverse part of the inlet channel 6 connects the inner side of the test sealing flange 2 to the sealing point of the sealing ring clamping flange 3 and the test movable pull rod 5. The inlet pipe 4 introduces high-purity micro-positive pressure nitrogen into the inlet channel 6. The high-purity micro-positive pressure nitrogen enters the sealing point, which can strengthen the sealing point and isolate the internal hydrogen from the external oxygen.

[0020] Furthermore, the test sealing assembly also includes a first sealing ring 7, with at least two first sealing rings 7 disposed between the test sealing flange 2 and the vacuum chamber neck flange 1. The test sealing flange 2 and the vacuum chamber neck flange 1 press the first sealing rings 7 to complete the seal, and one side of the air intake channel 6 is located between the two first sealing rings 7.

[0021] In a specific implementation, two first sealing rings 7 are arranged sequentially outward from the center of the test sealing flange 2, and the first sealing rings 7 complete the static seal between the test sealing flange 2 and the vacuum chamber neck flange 1.

[0022] Furthermore, the test sealing assembly also includes a second sealing ring 8. Two second sealing rings 8 are disposed on the upper and lower sides of the test sealing flange 2, and the second sealing rings 8 are in contact with the test sealing flange 2, the sealing ring clamping flange 3, and the test movable pull rod 5. The test sealing flange 2, the sealing ring clamping flange 3, and the test movable pull rod 5 together squeeze the second sealing rings 8 to complete the seal. The other side of the air intake channel 6 is located between the two sealing rings.

[0023] In a specific embodiment, the second sealing ring 8 is disposed between the test sealing flange 2, the sealing ring clamping flange 3 and the test movable pull rod 5. The two second sealing rings 8 are arranged vertically on the upper and lower sides of the test sealing flange 2. The sealing ring clamping flange 3 presses the second sealing ring 8 onto the test sealing flange 2, while the second sealing ring 8 is tightly fitted against the test movable pull rod 5.

[0024] In one embodiment, using two first sealing rings 7 and two second sealing rings 8 enhances the sealing performance. By introducing high-purity nitrogen gas at a pressure greater than the hydrogen pressure inside the vacuum chamber between the two first sealing rings 7 and the two second sealing rings 8 through the inlet channel 6, the internal hydrogen and external oxygen can be better isolated. (Refer to...) Figure 2 The second sealing ring 8 seals at the middle. Figure 2 The red arrows indicate the airflow direction, and the blue arrows indicate the hydrogen flow direction. The same applies to the first sealing ring 7.

[0025] Furthermore, the first sealing ring 7 is an O-ring, and the second sealing ring 8 is an X-ring.

[0026] In a specific embodiment, the first sealing ring 7 has an O-shaped cross section, the second sealing ring 8 has an X-shaped cross section, the second sealing ring 8 seals three components, and the first sealing ring 7 seals two components.

[0027] Furthermore, a test reaction support rod 11 is provided at the bottom of the test sealing flange 2, and the test reaction support rod 11 is fixedly connected to the test sealing flange 2.

[0028] In a specific implementation, the test reaction support rod 11 is used to provide a reaction support force to the test interactive pull rod.

[0029] Furthermore, the test sealing assembly also includes a fixing screw 9, which passes through the flat washer and the spring washer in sequence and fixes the sealing ring clamping flange 3 to the test sealing flange 2.

[0030] In a specific implementation, bolts are used to press the sealing ring against the flange 3 for fixation, and flat gaskets and elastic gaskets are used for fastening the installation and preventing loosening.

[0031] Furthermore, plugs 10 are also provided on both sides of the test sealing flange 2, and the plugs 10 seal one side of the air inlet channel 6.

[0032] In a specific implementation, when processing the air intake channel 6, since the test sealing flange 2 is integrally formed, it is impossible to process it from the inner wall to the outer side. Instead, a cylindrical groove that is interconnected is processed in both the horizontal and vertical directions. The plug 10 is used to block the leaking part of the test sealing flange 2 to prevent gas leakage. The plug 10 can also be replaced with the air intake pipe 4 for connection.

[0033] Of course, there may be other implementations of this utility model. Based on this implementation, other implementations obtained by those skilled in the art without any creative effort are all within the scope of protection of this utility model.

Claims

1. A hydrogen-sealing structure for an in-situ hydrogen-contaminated cryogenic mechanical testing system, characterized in that, This includes test-sealed components and vacuum chamber neck flanges, among which: The test sealing assembly includes a test sealing flange, a sealing ring clamping flange, and an air inlet pipe. A test movable pull rod is provided at the center of the test sealing flange. The sealing ring clamping flange is provided on both the upper and lower sides of the test sealing flange and is sealed and fitted with the test movable pull rod and the test sealing flange. The bottom of the test sealing flange is fitted and sealed with the neck flange of the vacuum chamber. An air inlet channel is provided inside the test sealing flange. The sealing points at the bottom of the test sealing flange and the neck flange of the vacuum chamber, the sealing points of the test movable pull rod, the sealing points of the test sealing flange, and the air inlet pipe connecting to the air inlet channel.

2. The hydrogen-sealing structure of the in-situ hydrogen-contaminated cryogenic mechanical testing machine system according to claim 1, characterized in that, The test sealing assembly further includes a first sealing ring, with at least two first sealing rings disposed between the test sealing flange and the vacuum chamber neck flange. The test sealing flange and the vacuum chamber neck flange press the first sealing rings to complete the seal, and the air inlet channel side is located between the two first sealing rings.

3. The hydrogen-sealing structure of the in-situ hydrogen-contaminated cryogenic mechanical testing machine system according to claim 1, characterized in that, The test sealing assembly also includes a second sealing ring. Two second sealing rings are disposed on the upper and lower sides of the test sealing flange, and the second sealing rings are in contact with the test sealing flange, the sealing ring clamping flange, and the test movable pull rod. The test sealing flange, the sealing ring clamping flange, and the test movable pull rod together compress the second sealing ring to complete the seal. The other side of the air inlet channel is located between the two sealing rings.

4. The hydrogen-sealing structure of the in-situ hydrogen-contaminated cryogenic mechanical testing machine system according to claim 2, characterized in that, The first sealing ring is an O-ring.

5. The hydrogen-sealing structure of the in-situ hydrogen-contaminated cryogenic mechanical testing machine system according to claim 3, characterized in that, The second sealing ring is an X-shaped sealing ring.

6. The hydrogen-sealing structure of the in-situ hydrogen-contaminated cryogenic mechanical testing machine system according to claim 5, characterized in that, The bottom of the test sealing flange is provided with a test reaction support rod, which is fixedly connected to the test sealing flange.

7. The hydrogen-sealing structure of the in-situ hydrogen-contaminated cryogenic mechanical testing machine system according to claim 1, characterized in that, The test sealing assembly also includes a fixing screw, which passes through a flat washer and a spring washer in sequence and fixes the sealing ring clamping flange to the test sealing flange.

8. The hydrogen-sealing structure of the in-situ hydrogen-contaminated cryogenic mechanical testing machine system according to claim 1, characterized in that, The test sealing flange is also provided with plugs on both sides, and the plugs seal one side of the air intake channel.

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