Liquid hydrogen valve with vacuum sandwich structure

Abstract

The utility model relates to the technical field of liquid hydrogen valves, in particular to a liquid hydrogen valve with a vacuum sandwich structure, a piston part is arranged in a valve body part in a sliding mode and connected with a valve cover part, the valve cover part is used for controlling the piston part to slide up and down, when the piston part moves upwards, a pipeline part is connected, and the liquid hydrogen valve is opened. When the piston part moves downwards, the pipeline part is disconnected, and the liquid hydrogen valve is closed; the barrel cavity, the outer cavity and the inner cavity are all in a vacuum state, heat exchange between the first interlayer part and the second interlayer part is little, the temperature drop of the second interlayer part is low, the temperature is higher than that of a piston body, and the situation that the temperature of the screw is absorbed, so that the screw is cooled and frozen, the liquid hydrogen valve cannot be normally opened and closed, and use of the liquid hydrogen valve is affected is avoided; the annular cavity is also in a vacuum state, so that the heat conductivity coefficient of the valve body part is reduced, external atmosphere is prevented from exchanging heat with liquid hydrogen, the liquid hydrogen is prevented from being vaporized due to temperature rise, and damage caused by too high internal air pressure of the liquid hydrogen valve is avoided.

Description

Technical Field

[0001] This utility model relates to the field of liquid hydrogen valve technology, and in particular to a liquid hydrogen valve with a vacuum jacket structure. Background Technology

[0002] Liquid hydrogen valves are used to control the flow of liquid hydrogen. Due to the special properties of liquid hydrogen, liquid hydrogen valves have strict requirements in terms of design, material selection, and performance. Liquid hydrogen has an extremely low temperature, approximately -253℃, requiring valve materials to maintain good mechanical properties, toughness, and resistance to cold brittleness at this temperature, such as austenitic stainless steel. Simultaneously, good thermal insulation measures are necessary to reduce heat transfer and prevent liquid hydrogen evaporation and leakage. Liquid hydrogen is prone to leakage and is flammable and explosive, necessitating reliable sealing performance from the valve to prevent both external and internal leakage. Typically, a hard metal seal structure is used, employing special designs such as combinations of bellows, packing, and O-rings to meet low-emission requirements. Given the flammable and explosive nature of liquid hydrogen, the valve must use explosion-proof materials, fire-resistant actuators, instruments, and cables, and possess stringent certifications. Furthermore, safety risks arising from pressure increases and oxygen condensation must be considered.

[0003] Chinese patent application CN202411479553.X discloses a liquid hydrogen shut-off valve. This valve employs a multi-layered sealing structure—comprising a first sealing assembly, a second sealing assembly, and a third sealing assembly—to reduce the likelihood of gas leakage within the valve. This improves the sealing performance between the valve stem assembly and the main body, as well as between the extension tube and the valve cover, thereby enhancing the valve's safety. Several heat dissipation rings are connected to the outer periphery of the connecting seat, which helps improve heat dissipation efficiency at the connecting seat and reduces the possibility of the second sealing assembly freezing and being damaged. Liquid hydrogen has an extremely low temperature, approximately -253°C. The shut-off valve disclosed in this application lacks a vacuum jacket structure, and relying solely on heat dissipation rings is insufficient to achieve effective anti-icing, easily leading to damage to the liquid hydrogen valve. Utility Model Content

[0004] The main objective of this invention is to provide a liquid hydrogen valve with a vacuum jacket structure to solve the problem in related technologies where liquid hydrogen shut-off valves lack a vacuum jacket structure and rely solely on heat dissipation rings to achieve effective anti-icing.

[0005] To achieve the above objectives, according to one aspect of the present invention, a liquid hydrogen valve with a vacuum jacket structure is provided, including a valve cover portion and a pipeline portion, wherein the valve cover portion is located above the pipeline portion and is used to control the on / off state of the pipeline portion, and further includes a valve body portion, wherein the valve body portion is fixedly disposed below the valve cover portion and is used to support the valve cover portion.

[0006] The piston is slidably disposed inside the valve body and connected to the valve cover. The valve cover is used to control the piston to slide up and down. When the piston moves upward, the pipeline is connected and the liquid hydrogen valve is opened. When the piston moves downward, the pipeline is disconnected and the liquid hydrogen valve is closed.

[0007] Furthermore, the valve cover includes a valve cover, a screw, and a handwheel. The screw passes through the valve cover and is threadedly connected to the valve cover. The handwheel is fixedly mounted on the top of the screw.

[0008] Furthermore, the valve body includes a valve body, an annular cavity, and a plug cavity. The valve body is fixedly disposed below the valve cover. The plug cavity is disposed in the middle of the lower end of the valve body. The annular cavity is disposed in the inner outer ring of the valve body and is located outside the plug cavity. The plug cavity is used to accommodate the piston.

[0009] Furthermore, the pipeline section includes an upstream pipeline and a downstream pipeline. The upstream pipeline is fixedly located on the left side of the bottom end of the valve body, and the downstream pipeline is fixedly located on the right side of the bottom end of the valve body. Both the upstream pipeline and the downstream pipeline are connected to the plug cavity.

[0010] Furthermore, the piston portion includes a piston body, a first interlayer portion and a second interlayer portion, the second interlayer portion being fixedly disposed at the bottom end of the screw, the first interlayer portion being fixedly disposed at the bottom end of the second interlayer portion, and the piston body being fixedly disposed at the bottom end of the first interlayer portion.

[0011] Furthermore, the first interlayer includes a cylindrical assembly, a chamber assembly, and several cross braces. The cylindrical assembly includes an outer cylinder and an inner cylinder, and the chamber assembly includes an outer cavity and an inner cavity. The inner cylinder is located inside the outer cylinder. The top ends of both the outer cylinder and the inner cylinder are fixedly connected to the bottom end of the second interlayer, and their bottom ends are fixedly connected to the piston body. The outer cavity is located between the outer cylinder and the inner cylinder, and the inner cavity is located inside the inner cylinder. The cross braces are all located inside the outer cavity and are fixedly connected to both the outer cylinder and the inner cylinder.

[0012] Furthermore, the cross brace includes an arc-shaped block assembly, a crossbar assembly, and several transverse protrusions. The arc-shaped block assembly includes a first arc-shaped block and a second arc-shaped block. The crossbar assembly includes two frustums and a crossbar. The two frustums are respectively fixed at both ends of the crossbar. The crossbar is fixedly connected to the first arc-shaped block and the second arc-shaped block through the frustums. The transverse protrusions are all fixedly located outside the first arc-shaped block and the second arc-shaped block. The first arc-shaped block is fixedly connected to the inner cylinder through the transverse protrusions, and the second arc-shaped block is fixedly connected to the outer cylinder through the transverse protrusions.

[0013] Furthermore, the second interlayer includes a cylindrical body, a cylindrical cavity, and several vertical support sections. The cylindrical cavity is located inside the cylindrical body, and the vertical support sections are all located inside the cylindrical cavity and are all fixedly connected to the cylindrical body. Each vertical support section includes several column groups and several connecting rods. Each column group includes a column, two connecting columns, and several vertical rods. The two connecting columns are respectively fixedly installed at both ends of the column. The vertical rods are all fixedly installed on the outside of the connecting columns and are all fixedly connected to the cylindrical body. The two ends of each connecting rod are respectively fixedly connected to two adjacent columns.

[0014] Compared with the prior art, this utility model has the following beneficial effects: The truncated cone increases the contact area between the crossbar and the first and second arc-shaped blocks, reducing the pressure on the first and second arc-shaped blocks and preventing them from being crushed by the crossbar; the first and second arc-shaped blocks enlarge the area at the end of the crossbar, distributing more transverse protrusions, enhancing the support strength of the cross bracing to the outer cylinder, preventing the outer cylinder from being deformed by external gas pressure, thus reducing the vacuum volume inside and making it unable to effectively insulate the liquid hydrogen; each transverse protrusion has a small diameter and a small contact area with the outer or inner cylinder, reducing thermal bridging and further reducing the thermal conductivity of the first interlayer; the three columns are arranged in a triangle, and multiple connecting rods are provided between adjacent columns, connecting the three columns into a whole, enhancing the overall stability of the vertical support. Qualitatively, the support for the cylinder is strengthened to prevent it from being flattened by the outside atmosphere, reducing the vacuum volume and increasing the thermal conductivity of the second jacket, which would hinder effective insulation of liquid hydrogen. The vertical rod reduces the contact area between the column and the cylinder, effectively reducing the thermal bridge effect and further enhancing the insulation effect of liquid hydrogen. The cylinder cavity, outer cavity, and inner cavity are all in a vacuum state, with less heat exchange between the first and second jackets. The temperature drop of the second jacket is lower, and its temperature is relatively higher than that of the piston body. This prevents the screw from absorbing the temperature of the screw, causing it to cool down and freeze, which would prevent the liquid hydrogen valve from opening and closing normally and affecting its use. The annular cavity is also in a vacuum state, reducing the thermal conductivity of the valve body and preventing heat exchange between the outside atmosphere and liquid hydrogen, which would cause the liquid hydrogen temperature to rise and vaporize, thus avoiding damage due to excessive gas pressure inside the liquid hydrogen valve. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall design of this utility model;

[0016] Figure 2 This is a cross-sectional view of the present invention;

[0017] Figure 3 This is a cross-sectional view of the piston part of this utility model;

[0018] Figure 4 This is a schematic diagram of the cross brace structure of this utility model;

[0019] Figure 5 This is a schematic diagram of the vertical support structure of this utility model.

[0020] Illustration:

[0021] 1. Valve cover; 11. Valve cover; 12. Screw; 13. Handwheel;

[0022] 2. Valve body section; 21. Valve body; 22. Annular cavity; 23. Plug cavity;

[0023] 3. Upstream pipelines;

[0024] 4. Downstream pipelines;

[0025] 5. Piston section; 51. Piston body; 52. First interlayer section; 53. Second interlayer section; 520. Transverse protrusion; 521. Outer cylinder; 522. Inner cylinder; 523. Outer cavity; 524. Inner cavity; 525. Horizontal support section; 526. First arc-shaped block; 527. Second arc-shaped block; 528. Frustum; 529. Horizontal bar; 531. Cylinder body; 532. Cylinder cavity; 533. Vertical support section; 534. Column; 535. Connecting rod; 536. Connecting column; 537. Vertical bar. Detailed Implementation

[0026] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0027] Please see Figures 1 to 5 This embodiment provides a liquid hydrogen valve with a vacuum jacket structure, including a valve cover 1 and a pipeline. The valve cover 1 is located above the pipeline and is used to control the on / off state of the pipeline. It also includes a valve body 2, which is fixedly disposed below the valve cover 1 and is used to support the valve cover 1.

[0028] The piston part 5 is slidably disposed inside the valve body part 2 and connected to the valve cover part 1. The valve cover part 1 is used to control the piston part 5 to slide up and down. When the piston part 5 moves upward, the pipeline is connected and the liquid hydrogen valve is opened. When the piston part 5 moves downward, the pipeline is disconnected and the liquid hydrogen valve is closed.

[0029] The valve cover part 1 includes a valve cover 11, a screw 12 and a handwheel 13. The screw 12 is inserted through the valve cover 11 and is threadedly connected to the valve cover 11. The handwheel 13 is fixedly mounted on the top of the screw 12.

[0030] The valve body 2 includes a valve body 21, an annular cavity 22, and a plug cavity 23. The valve body 21 is fixedly located below the valve cover 11. The plug cavity 23 is located in the middle of the lower end of the valve body 21. The annular cavity 22 is located in the inner outer ring of the valve body 21 and is located outside the plug cavity 23. The plug cavity 23 is used to accommodate the piston part 5. The annular cavity 22 is in a vacuum state, which reduces the thermal conductivity of the valve body 2 and prevents the outside air from exchanging heat with the liquid hydrogen, causing its temperature to rise and vaporize.

[0031] The pipeline section includes an upstream pipeline 3 and a downstream pipeline 4. The upstream pipeline 3 is fixedly located on the left side of the bottom end of the valve body 21, and the downstream pipeline 4 is fixedly located on the right side of the bottom end of the valve body 21. Both the upstream pipeline 3 and the downstream pipeline 4 are connected to the plug cavity 23. Liquid hydrogen flows from the upstream pipeline 3 into the plug cavity 23 and then from the plug cavity 23 into the downstream pipeline 4.

[0032] The piston part 5 includes a piston body 51, a first interlayer part 52 and a second interlayer part 53. The second interlayer part 53 is fixedly disposed at the bottom end of the screw 12, the first interlayer part 52 is fixedly disposed at the bottom end of the second interlayer part 53, and the piston body 51 is fixedly disposed at the bottom end of the first interlayer part 52.

[0033] The piston body 51 is made of polytetrafluoroethylene (PTFE), which has an extremely low coefficient of friction, good chemical and thermal stability, and hardly reacts with any chemical substances, thus resisting the corrosion of liquid hydrogen. At the same time, it maintains good flexibility and sealing performance at low temperatures, ensuring the sealing of the liquid hydrogen valve.

[0034] The first interlayer portion 52 includes a cylindrical assembly, a chamber assembly, and several cross bracing portions 525. The cylindrical assembly includes an outer cylinder 521 and an inner cylinder 522. The chamber assembly includes an outer cavity 523 and an inner cavity 524. Both the outer cavity 523 and the inner cavity 524 are in a vacuum state to reduce the thermal conductivity of the first interlayer portion 52 and prevent liquid hydrogen from absorbing heat. The inner cylinder 522 is located inside the outer cylinder 521. The top ends of both the outer cylinder 521 and the inner cylinder 522 are fixedly connected to the bottom end of the second interlayer portion 53, and the bottom ends are fixedly connected to the piston body 51. The outer cavity 523 is located between the outer cylinder 521 and the inner cylinder 522, and the inner cavity 524 is located inside the inner cylinder 522. The cross bracing portions 525 are all located inside the outer cavity 523 and are fixedly connected to both the outer cylinder 521 and the inner cylinder 522.

[0035] The cross brace 525 includes an arc-shaped block assembly, a crossbar assembly, and several transverse protrusions 520. The arc-shaped block assembly includes a first arc-shaped block 526 and a second arc-shaped block 527. The crossbar assembly includes two frustums 528 and a crossbar 529. The two frustums 528 are fixedly mounted at both ends of the crossbar 529. The crossbar 529 is fixedly connected to the first arc-shaped block 526 and the second arc-shaped block 527 through the frustums 528. The transverse protrusions 520 are all fixedly mounted on the outside of the first arc-shaped block 526 and the second arc-shaped block 527. The first arc-shaped block 526 is fixedly connected to the inner cylinder 522 through the transverse protrusions 520. The second arc-shaped block 527 is fixedly connected to the outer cylinder 521 through the transverse protrusions 520.

[0036] The truncated cone 528 increases the contact area between the crossbar 529 and the first arc-shaped block 526 and the second arc-shaped block 527, reducing the pressure on the first arc-shaped block 526 and the second arc-shaped block 527 and preventing them from being crushed by the crossbar 529. The first arc-shaped block 526 and the second arc-shaped block 527 enlarge the area at the end of the crossbar 529, distributing more transverse protrusions 520, enhancing the support strength of the cross brace 525 for the outer cylinder 521, preventing the outer cylinder 521 from being squeezed and deformed by external air pressure, thus reducing the vacuum volume inside and making it unable to effectively insulate the liquid hydrogen. Each transverse protrusion 520 has a small diameter and a small contact area with the outer cylinder 521 or the inner cylinder 522, reducing thermal bridging and further reducing the thermal conductivity of the first interlayer 52.

[0037] The second interlayer 53 includes a cylinder 531, a cylindrical cavity 532, and several vertical support sections 533. The cylindrical cavity 532 is located inside the cylinder 531 and is in a vacuum state to prevent liquid hydrogen from absorbing heat and vaporizing. The vertical support sections 533 are all located inside the cylindrical cavity 532 and are all fixedly connected to the cylinder 531. The vertical support section 533 includes several column groups and several connecting rods 535. The column group includes a column 534, two connecting columns 536, and several vertical rods 537. The two connecting columns 536 are respectively fixedly installed at both ends of the column 534. The vertical rods 537 are all fixedly installed on the outside of the connecting columns 536 and are all fixedly connected to the cylinder 531. The two ends of the connecting rods 535 are respectively fixedly connected to two adjacent columns 534.

[0038] The three columns 534 are arranged in a triangle, and multiple connecting rods 535 are provided between adjacent columns 534 to connect the three columns 534 into a whole, which enhances the overall stability of the vertical support 533, strengthens the support for the cylinder 531, prevents the cylinder 531 from being flattened by the outside atmosphere, reduces the vacuum volume, and causes the thermal conductivity of the second interlayer 53 to increase, making it unable to effectively insulate the liquid hydrogen. The vertical rods 537 reduce the contact area between the columns 534 and the cylinder 531, effectively reducing the thermal bridge effect and further enhancing the insulation effect of the liquid hydrogen.

[0039] Turning handwheel 13 moves screw 12 downward along valve cover 11, pushing piston 5 downward and blocking the bottom of plug chamber 23, disconnecting upstream pipe 3 and downstream pipe 4. Liquid hydrogen cannot flow from upstream pipe 3 through plug chamber 23 into downstream pipe 4, and the liquid hydrogen valve is closed. Connect upstream pipe 3 to the liquid hydrogen source and downstream pipe 4 to the equipment end. Turning handwheel 13 in the opposite direction moves screw 12 upward along valve cover 11, pushing piston 5 upward and away from the bottom of plug chamber 23. Upstream pipe 3 and downstream pipe 4 are connected by plug chamber 23, and liquid hydrogen flows from upstream pipe 3 through plug chamber 23 into downstream pipe 4 for equipment use, and the liquid hydrogen valve is opened. After liquid hydrogen contacts piston body 51, the temperature of piston body 51 drops sharply due to heat exchange. The cavities 523 and 524 are filled with vacuum, so the thermal conductivity of the first interlayer 52 is low, resulting in less heat exchange between the piston body 51 and the first interlayer 52. The temperature drop of the first interlayer 52 is low, and its temperature is relatively higher than that of the piston body 51. The cylindrical cavity 532 is also in a vacuum state, and the thermal conductivity of the second interlayer 53 is also low. The heat exchange between the first interlayer 52 and the second interlayer 53 is also low, resulting in a lower temperature drop of the second interlayer 53. Its temperature is relatively higher than that of the piston body 51, preventing the screw 12 from absorbing heat and freezing, which would prevent the liquid hydrogen valve from opening and closing properly and affecting its use. The annular cavity 22 is also in a vacuum state, reducing the thermal conductivity of the valve body 2 and preventing heat exchange between the external atmosphere and the liquid hydrogen, which would cause the liquid hydrogen to rise in temperature and vaporize, thus avoiding damage due to excessive internal pressure in the liquid hydrogen valve.

[0040] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A liquid hydrogen valve with a vacuum jacket structure, comprising a valve cover portion (1) and a pipeline portion, wherein the valve cover portion (1) is located above the pipeline portion and is used to control the on / off state of the pipeline portion, characterized in that, Also includes: Valve body (2), which is fixedly disposed below valve cover (1) and is used to support valve cover (1); The valve body (2) includes a valve body (21), an annular cavity (22), and a plug cavity (23). Piston part (5), the piston part (5) is slidably disposed inside the valve body part (2) and connected to the valve cover part (1). The valve cover part (1) is used to control the piston part (5) to slide up and down. When the piston part (5) moves upward, the pipeline part is connected and the liquid hydrogen valve is opened. When the piston part (5) moves downward, the pipeline part is disconnected and the liquid hydrogen valve is closed. The piston section (5) includes a piston body (51), a first interlayer section (52), and a second interlayer section (53). The second interlayer section (53) is fixedly disposed at the bottom end of the screw (12), and the first interlayer section (52) is fixedly disposed at the bottom end of the second interlayer section (53). The piston body (51) is fixedly disposed at the bottom end of the first interlayer section (52). The first interlayer section (52) includes a cylindrical assembly, a chamber assembly, and several cross braces (525). The cylindrical assembly includes an outer cylinder. (521) and inner cylinder (522), the chamber assembly includes an outer cavity (523) and an inner cavity (524), the inner cylinder (522) is located inside the outer cylinder (521), the top ends of the outer cylinder (521) and the inner cylinder (522) are fixedly connected to the bottom end of the second interlayer (53), and the bottom ends are fixedly connected to the piston body (51), the outer cavity (523) is located between the outer cylinder (521) and the inner cylinder (522), and the inner cavity (524) is located within the inner cylinder (521). 22) Inside, the horizontal support parts (525) are all located inside the outer cavity (523) and are fixedly connected to both the outer cylinder (521) and the inner cylinder (522); the second interlayer part (53) includes a cylinder body (531), a cylinder cavity (532) and several vertical support parts (533), the cylinder cavity (532) is located inside the cylinder body (531), the vertical support parts (533) are all located inside the cylinder cavity (532) and are fixedly connected to both the cylinder body (531), the vertical support parts (525) are all located inside the cylinder cavity (532) and are fixedly connected to both the cylinder body (531), the vertical support parts (525) are all located inside the cylinder cavity (532) and are fixedly connected to both the cylinder body (531), the vertical support parts (525) are all located inside the cylinder cavity (532) and are fixedly connected to both the cylinder body (52 ...2) and the inner cylinder (522). 33) Includes several column groups and several connecting rods (535). The column group includes a column (534), two connecting columns (536) and several vertical rods (537). The two connecting columns (536) are respectively fixed at both ends of the column (534). The vertical rods (537) are all fixed on the outside of the connecting columns (536) and are all fixedly connected to the cylinder (531). The two ends of the connecting rods (535) are respectively fixedly connected to two adjacent columns (534).

2. The liquid hydrogen valve with a vacuum jacket structure according to claim 1, characterized in that, The valve cover (1) includes a valve cover (11), a screw (12) and a handwheel (13). The screw (12) is inserted through the valve cover (11) and threadedly connected to the valve cover (11). The handwheel (13) is fixedly located on the top of the screw (12).

3. The liquid hydrogen valve with a vacuum jacket structure according to claim 2, characterized in that, The valve body (21) is fixedly disposed below the valve cover (11), the plug cavity (23) is disposed in the middle of the lower end of the valve body (21), the annular cavity (22) is disposed in the inner outer ring of the valve body (21) and is located outside the plug cavity (23), and the plug cavity (23) is used to accommodate the piston part (5).

4. The liquid hydrogen valve with a vacuum jacket structure according to claim 3, characterized in that, The pipeline section includes an upstream pipeline (3) and a downstream pipeline (4). The upstream pipeline (3) is fixedly located on the left side of the bottom end of the valve body (21), and the downstream pipeline (4) is fixedly located on the right side of the bottom end of the valve body (21). Both the upstream pipeline (3) and the downstream pipeline (4) are connected to the plug cavity (23).

5. The liquid hydrogen valve with a vacuum jacket structure according to claim 4, characterized in that, The cross brace (525) includes an arc-shaped block group, a crossbar group, and several transverse protrusions (520). The arc-shaped block group includes a first arc-shaped block (526) and a second arc-shaped block (527). The crossbar group includes two frustums (528) and a crossbar (529). The two frustums (528) are fixedly disposed at both ends of the crossbar (529). The crossbar (529) is fixedly connected to the first arc-shaped block (526) and the second arc-shaped block (527) through the frustums (528). The transverse protrusions (520) are all fixedly disposed on the outside of the first arc-shaped block (526) and the second arc-shaped block (527). The first arc-shaped block (526) is fixedly connected to the inner cylinder (522) through the transverse protrusions (520). The second arc-shaped block (527) is fixedly connected to the outer cylinder (521) through the transverse protrusions (520).

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