A core-pulling corrugated tube single-seat angle valve for liquid hydrogen

Abstract

This invention provides a single-seat angle valve with a bellows and core-pulling mechanism for liquid hydrogen, which has good sealing performance in the low-temperature environment of liquid hydrogen and can prevent liquid hydrogen leakage. It includes a valve body, a valve core installed inside the valve body, a valve stem connected to the valve core, a valve cover extending from the top of the valve stem, and a valve cover including an upper valve cover and a lower valve cover, which are connected by valve cover bolts. The upper valve cover is fitted onto the top of the valve stem. The length of the valve body and valve stem is extended to form an extended neck. The valve stem is fitted with a bellows, a connecting pipe, and a vacuum jacket from the inside to the outside. The vacuum jacket also encloses the valve body. The inner side of the top of the vacuum jacket is welded to the outer side of the bottom of the lower valve cover. The top of the connecting pipe is fixedly connected to the inner side of the lower valve cover, and the bottom of the connecting pipe is fixedly connected to the valve body. The upper and lower valve covers are sealed by a bellows. A disc is provided at the top of the bellows. The disc at the top of the bellows is press-fitted between the upper and lower valve covers. Sealing gaskets are respectively installed on the top and bottom surfaces of the disc. The bottom of the bellows is welded to the valve stem.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, specifically a single-seat angle valve with a core-pulling bellows for liquid hydrogen. Background Technology

[0002] Hydrogen energy boasts high energy density and is clean and pollution-free, making it highly valued by various industries in the context of advocating sustainable development and low-carbon environmental protection. Due to its extremely low temperature and high fluidity, liquid hydrogen requires valves to maintain sufficient strength and toughness under operating conditions, ensuring zero leakage and preventing fires and explosions caused by liquid hydrogen leaks.

[0003] Existing liquid hydrogen valves are susceptible to leakage due to the proximity of the valve cover to the valve core. The cover is easily affected by the low temperature of the liquid hydrogen within the valve core, causing the sealing gaskets and packing to expand and contract with temperature changes. This expansion and contraction creates gaps at the valve cover's seal, affecting its sealing performance and leading to liquid hydrogen leakage. Furthermore, the valve body and valve core are typically sealed using a valve seat, which is connected to the valve body via bolts. In the low-temperature environment of liquid hydrogen, the sealing gaskets on these bolts also expand and contract with temperature changes, creating gaps and causing further leakage. Summary of the Invention

[0004] To address the drawback of existing liquid hydrogen valves where thermal expansion and contraction in the cryogenic environment of liquid hydrogen affects sealing performance and leads to liquid hydrogen leakage, this invention provides a single-seat angle valve with a pull-out bellows design for liquid hydrogen. This valve offers excellent sealing performance in cryogenic liquid hydrogen environments, thus preventing liquid hydrogen leakage.

[0005] A single-seat angle valve with a bellows and pull-out mechanism for liquid hydrogen includes a valve body, a valve core installed within the valve body, the valve core connected to a valve stem, the top of the valve stem extending out of a valve cover, the valve cover including an upper valve cover and a lower valve cover, the upper valve cover and the lower valve cover being connected by valve cover bolts, the upper valve cover being fitted onto the top of the valve stem, the cavity of the upper valve cover being funnel-shaped, a packing seat being installed in the upper half of the cavity of the upper valve cover, the packing seat being filled with two layers of packing, a packing spacer being provided between the two layers of packing, a packing gland being press-fitted onto the top of the upper packing, a packing pressure plate being press-fitted onto the top of the packing gland, a dustproof ring being provided between the packing pressure plate and the packing gland, and the packing pressure plate being fixedly installed on the top of the upper valve cover by packing bolts; characterized in that: the valve body The valve stem is lengthened to form an extended neck; the valve stem is sequentially fitted with a bellows, a connecting pipe, and a vacuum jacket from the inside out, the vacuum jacket also enclosing the valve body, and the inner side of the top end of the vacuum jacket is welded to the outer side of the bottom end of the lower valve cover; the top end of the connecting pipe is fixedly connected to the inner side of the lower valve cover, and the bottom end of the connecting pipe is fixedly connected to the valve body; the upper valve cover and the lower valve cover are sealed by the bellows, the top end of the bellows is provided with a disc, the top disc of the bellows is press-fitted between the upper valve cover and the lower valve cover, the top and bottom surfaces of the disc are respectively padded with sealing gaskets, the bottom end of the bellows is welded to the valve stem, the bottom end of the cavity of the upper valve cover is connected to the bellows, and the inner diameter of the bellows is smaller than the inner diameter of the bottom end of the cavity of the upper valve cover.

[0006] Its further features are:

[0007] The inner side of the valve body is provided with a sealing surface that matches the shape of the valve core, so that the valve body and the valve core plane fit together to seal.

[0008] The valve core has a pressure relief hole, which connects the cavity of the valve body and the cavity of the connecting pipe;

[0009] A guide layer is provided on the inner side of the valve body.

[0010] With the above-described structure of this invention, the valve body and valve stem are lengthened to form an extended neck and placed in a vacuum jacket. This isolates the valve cover from the liquid hydrogen inside the valve core, preventing the sealing parts from being affected by the thermal expansion and contraction of liquid hydrogen at low temperatures. This ensures a better sealing effect for the valve cover and prevents liquid hydrogen leakage. The bellows prevents the medium from leaking outward through the valve stem. The bellows expands and contracts accordingly with the up-and-down movement of the valve stem, while ensuring a tight seal between the sealing surfaces to prevent leakage. A certain pre-tightening force is applied during bellows installation to ensure sufficient sealing force under different operating conditions, improving the sealing effect. The valve body and valve core are sealed by a planar sealing surface, eliminating the need for bolts and avoiding sealing problems caused by the thermal expansion and contraction of bolt gaskets under cryogenic conditions. This further ensures the sealing effect and prevents liquid hydrogen leakage. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model;

[0012] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0013] Figure 3 for Figure 1 Enlarged view of point B in the middle. Detailed Implementation

[0014] See Figure 1 , Figure 2 A single-seat angle valve with a bellows and core for liquid hydrogen includes a valve body 1, a valve core 3 installed inside the valve body 1, a valve stem 4 connected to the valve core 3, a valve cover extending from the top of the valve stem 4, and a valve cover including an upper valve cover 6 and a lower valve cover 7 connected by valve cover bolts 8. The upper valve cover 6 is fitted onto the top of the valve stem 4. The cavity of the upper valve cover 6 is funnel-shaped. A packing seat 9 is installed in the upper half of the cavity of the upper valve cover 6. Two layers of packing are packed on the packing seat 9. A packing spacer 10 is provided between the two layers of packing. A packing gland 12 is pressed onto the top of the upper packing. A packing pressure plate 13 is pressed onto the top of the packing gland 12. A dustproof ring 14 is provided between the packing pressure plate 13 and the packing gland 12. The packing pressure plate 13 is fixedly installed on the top of the upper valve cover 6 by packing bolts 15. The length of valve body 1 and valve stem 4 is increased to form an extended neck, which keeps the easily leaking valve cover away from liquid hydrogen and prevents gaps caused by thermal expansion and contraction of the valve cover from affecting the seal.

[0015] The valve stem 4 is fitted with a bellows 2, a connecting pipe 17, and a vacuum jacket 18 sequentially from the inside out. The vacuum jacket 18 also encloses the valve body 1. The inner top of the vacuum jacket 18 is welded to the outer bottom of the lower valve cover 7. The top of the connecting pipe 17 is fixedly connected to the inner side of the lower valve cover 7, and the bottom of the connecting pipe 17 is fixedly connected to the valve body 1. The connecting pipe 17 and the vacuum jacket 18 can isolate the valve cover from the liquid hydrogen flow section, further ensuring that it is not affected by the liquid hydrogen temperature, keeping the valve stable at a suitable operating temperature, and also preventing excessive heat exchange between the liquid hydrogen and the outside environment, which would affect the transport of liquid hydrogen.

[0016] The upper valve cover 6 and the lower valve cover 7 are sealed by a bellows 2. A disc 16 is located at the top of the bellows 2, and this disc 16 is press-fitted between the upper valve cover 6 and the lower valve cover 7. Sealing gaskets 5 are respectively installed on the top and bottom surfaces of the disc 16. The bottom end of the bellows 2 is welded to the valve stem 4. The bottom end of the cavity of the upper valve cover 6 is connected to the bellows 2. The inner diameter of the bellows 2 is smaller than the inner diameter of the bottom end of the cavity of the upper valve cover 6. The bellows 2 prevents the medium from leaking out through the valve stem 4. The bellows 2 expands and contracts accordingly with the up-and-down movement of the valve stem 4, while ensuring a tight seal between the sealing surfaces to prevent leakage. A certain preload is applied during installation of the bellows 2 to ensure sufficient sealing force under different operating conditions.

[0017] The inner side of the valve body 1 is provided with a sealing surface that matches the shape of the valve core 3, so that the valve body 1 and the valve core 3 are sealed by planar contact, avoiding the use of threaded connection to seal the valve body 1 and the valve core 3, avoiding the problem of bolt gasket sealing under ultra-low temperature conditions, and further ensuring the sealing effect.

[0018] The valve core 3 has a pressure relief hole 19, which connects the cavity of the valve body 1 and the cavity of the connecting pipe 17, allowing the medium to flow between the cavity of the valve body 1 and the cavity of the connecting pipe 17, so that the pressure on both sides is the same, and avoiding the impact of pressure imbalance in the cavity of the valve body 1 and the cavity of the connecting pipe 17 on the up and down movement of the valve core 3.

[0019] See Figure 3 A guide layer 20 is provided on the inner side of the valve body 1. In this embodiment, the guide layer 20 is preferably made of hard alloy by overlay welding on the inner side of the valve body 1. The guide layer 20 serves to guide the valve core 3, ensuring that the valve body 1 and the valve core 3 are located on the same center line.

Claims

1. A single-seat angle valve with a bellows and pull-out mechanism for liquid hydrogen, comprising a valve body, a valve core installed within the valve body, the valve core connected to a valve stem, a valve cover extending from the top of the valve stem, the valve cover comprising an upper valve cover and a lower valve cover, the upper valve cover and the lower valve cover being connected by valve cover bolts, the upper valve cover being fitted onto the top of the valve stem, the cavity of the upper valve cover being funnel-shaped, a packing seat being installed in the upper half of the cavity of the upper valve cover, two layers of packing being pressed onto the packing seat, a packing spacer being provided between the two layers of packing, a packing gland being press-fitted onto the top of the upper packing, a packing pressure plate being press-fitted onto the top of the packing gland, a dustproof ring being provided between the packing pressure plate and the packing gland, and the packing pressure plate being fixedly installed on the top of the upper valve cover by packing bolts; characterized in that: The valve body and valve stem are lengthened to form an extended neck; the valve stem is fitted with a bellows, a connecting pipe, and a vacuum jacket sequentially from the inside to the outside, and the vacuum jacket also encloses the valve body. The inner side of the top end of the vacuum jacket is welded to the outer side of the bottom end of the lower valve cover; the top end of the connecting pipe is fixedly connected to the inner side of the lower valve cover, and the bottom end of the connecting pipe is fixedly connected to the valve body; the upper valve cover and the lower valve cover are sealed by the bellows, and a disc is provided at the top end of the bellows. The disc at the top end of the bellows is press-fitted between the upper valve cover and the lower valve cover. Sealing gaskets are respectively installed on the top and bottom surfaces of the disc. The bottom end of the bellows is welded to the valve stem. The bottom end of the cavity of the upper valve cover is connected to the bellows, and the inner diameter of the bellows is smaller than the inner diameter of the bottom end of the cavity of the upper valve cover.

2. The core-pulled bellows single seat angle valve for liquid hydrogen according to claim 1, characterized in that: The valve body has a sealing surface on its inner side that matches the shape of the valve core, so that the valve body and the valve core plane fit together to seal.

3. The single seat bellows core-pulled angle valve for liquid hydrogen of claim 1, wherein: The valve core has a pressure relief hole, which connects the cavity of the valve body and the cavity of the connecting pipe.

4. The single seat bellows core-pulled corrugated tube angle valve for liquid hydrogen of claim 1, wherein: A guide layer is provided on the inner side of the valve body.

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