Emergency cut-off stop valve for liquid hydrogen

Abstract

The utility model provides an emergency cut-off stop valve for liquid hydrogen, which comprises a valve body, a valve clack, a fixer and a sealing ring, and the valve clack is arranged in the valve body; the valve clack is suitable for abutting against the side wall of a runner opening in the valve body. The fixer is connected with the bottom of the valve clack; the sealing ring is arranged between the valve clack and the fixator and is configured to protrude out of the circumferential side of the valve clack, and the part, protruding out of the circumferential side of the valve clack, of the sealing ring is suitable for abutting against the side wall of a runner opening in the valve body and sealing the runner opening; the side wall depth of a flow channel opening in the valve body is larger than the width of the sealing ring protruding out of the circumferential side of the valve clack. The depth of the side wall of the flow channel opening in the valve body is larger than the width of the part, protruding out of the circumferential side of the valve clack, of the sealing ring, after the sealing ring loses efficacy due to excessive abrasion, effective sealing can still be formed through tight attaching between the valve clack and the side wall of the flow channel opening in the valve body, and liquid hydrogen medium leakage is prevented.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to an emergency shut-off valve for liquid hydrogen. Background Technology

[0002] Gate valves are a widely used and extremely important type of shut-off valve. The sealing of a gate valve is achieved by applying torque to the valve stem, which in turn applies pressure to the valve disc in the axial direction, causing the valve disc sealing surface to fit tightly against the valve seat sealing surface, preventing the medium from leaking along the gap between the sealing surfaces. Gate valves are relatively durable due to the low friction between the sealing surfaces during opening and closing. They also have a small opening height, are easy to manufacture, and are convenient to maintain. They are suitable not only for medium and low pressure but also for high pressure.

[0003] Liquid hydrogen is mostly transported through pipelines, and shut-off valves are commonly used in these pipelines. These valves play a crucial role in cutting off and throttling the medium in their respective pipelines. However, due to the extremely low temperature of liquid hydrogen, conventional shut-off valves on the market, such as the cryogenic shut-off valve for liquid hydrogen disclosed in CN116292931A, achieve sealing directly through the contact between the valve core and the valve body. This single sealing method makes them prone to leakage. Utility Model Content

[0004] In view of this, the present invention provides an emergency shut-off valve for liquid hydrogen to solve the problem of the single sealing method of existing cryogenic shut-off valves for liquid hydrogen.

[0005] In a first aspect, this utility model provides an emergency shut-off valve for liquid hydrogen, comprising:

[0006] Valve body;

[0007] A valve disc is located inside the valve body; the valve disc is adapted to abut against the side wall of the flow channel opening inside the valve body.

[0008] A retainer is connected to the bottom of the valve disc;

[0009] A sealing ring is disposed between the valve disc and the retainer. The sealing ring is configured to protrude from the periphery of the valve disc. The portion of the sealing ring protruding from the periphery of the valve disc is adapted to abut against the side wall of the flow channel port inside the valve body and close the flow channel port.

[0010] The depth of the inner flow channel sidewall of the valve body is greater than the width of the portion of the sealing ring that protrudes from the valve disc.

[0011] This liquid hydrogen emergency shut-off valve features an internal flow channel. A valve disc abuts against this flow channel to seal it, thus cutting off the liquid flow inside the valve body. A retainer is connected to the bottom of the valve disc, and a sealing ring is placed between the valve disc and the retainer. The retainer secures the sealing ring, which protrudes from the valve disc's periphery. This protruding portion of the sealing ring abuts against the sidewall of the internal flow channel within the valve body, sealing the flow channel. By ensuring the depth of the internal flow channel sidewall is greater than the width of the protruding portion of the sealing ring, even if the sealing ring fails due to excessive wear, an effective seal can still be formed by the valve disc tightly adhering to the sidewall of the internal flow channel, preventing liquid hydrogen leakage.

[0012] In one alternative embodiment, at least one of the contact surfaces between the sealing ring and the retainer is a sloped surface.

[0013] This liquid hydrogen emergency shut-off valve has a structure in which at least one of the contact surfaces between the sealing ring and the retainer is a ramp surface. Therefore, when the retainer squeezes the sealing ring towards the valve disc, the retainer can squeeze the ramp surface of the sealing ring through the ramp surface to fix the sealing ring.

[0014] In one alternative embodiment, the contact point between the sealing ring and the valve disc is provided with a stepped structure.

[0015] This liquid hydrogen emergency shut-off valve features a stepped structure at the contact point between the sealing ring and the valve disc, increasing the contact area between them and forming a labyrinth seal to prevent liquid hydrogen from penetrating and leaking between the valve disc and the sealing ring.

[0016] In one alternative embodiment, the sealing ring is made of high-performance plastic.

[0017] In one alternative embodiment, the retainer and the valve disc are connected by screws, and the screw heads are spot-welded.

[0018] In one alternative embodiment, the emergency shut-off valve for liquid hydrogen further includes a guide sleeve that is fitted onto the surface of the valve stem and limits the position of the valve stem.

[0019] This liquid hydrogen emergency shut-off valve features a guide sleeve that positions the valve stem during operation, preventing damage to the sealing ring caused by misalignment due to valve body dimensional errors. Simultaneously, the guide sleeve, positioned between the valve body and stem, prevents rapid upward flow of liquid hydrogen, thus avoiding packing freezing and increased valve opening / closing torque. It also prevents excessive hydrogen accumulation in the upper cavity of the valve body (due to liquid hydrogen evaporation and the lower density of gaseous hydrogen compared to liquid hydrogen), thus reducing the risk of higher pressure at the top compared to the bottom.

[0020] In one alternative embodiment, the guide sleeve is filled between the valve body and the valve stem.

[0021] In one alternative embodiment, the emergency shut-off valve for liquid hydrogen further includes a valve cover connected to the valve body, and the valve stem passing through the valve cover.

[0022] In one alternative embodiment, the emergency shut-off valve for liquid hydrogen further includes packing material that fills the space between the valve cover and the valve stem.

[0023] This utility model provides an emergency shut-off valve for liquid hydrogen, which has the following advantages:

[0024] 1. This utility model provides an emergency shut-off valve for liquid hydrogen, including a valve body, a valve disc, a retainer, and a sealing ring. The valve disc is located inside the valve body; the valve disc is adapted to abut against the side wall of the flow channel inside the valve body; the retainer is connected to the bottom of the valve disc; the sealing ring is located between the valve disc and the retainer, and the sealing ring is configured to protrude from the periphery of the valve disc. The portion of the sealing ring protruding from the periphery of the valve disc is adapted to abut against the side wall of the flow channel inside the valve body and close the flow channel; wherein, the depth of the side wall of the flow channel inside the valve body is greater than the width of the portion of the sealing ring protruding from the periphery of the valve disc.

[0025] This liquid hydrogen emergency shut-off valve features an internal flow channel. A valve disc abuts against this flow channel to seal it, thus cutting off the liquid flow inside the valve body. A retainer is connected to the bottom of the valve disc, and a sealing ring is placed between the valve disc and the retainer. The retainer secures the sealing ring, which protrudes from the valve disc's periphery. This protruding portion of the sealing ring abuts against the sidewall of the internal flow channel within the valve body, sealing the flow channel. By ensuring the depth of the internal flow channel sidewall is greater than the width of the protruding portion of the sealing ring, even if the sealing ring fails due to excessive wear, an effective seal can still be formed by the valve disc tightly adhering to the sidewall of the internal flow channel, preventing liquid hydrogen leakage.

[0026] 2. This utility model provides an emergency shut-off valve for liquid hydrogen, wherein at least one of the contact surfaces between the sealing ring and the retainer is a sloping surface, and the sealing ring is configured to be squeezed through the sloping surface to partially protrude from the periphery of the valve disc.

[0027] This liquid hydrogen emergency shut-off valve has a structure in which at least one of the contact surfaces between the sealing ring and the retainer is a ramp surface. Therefore, when the retainer squeezes the sealing ring towards the valve disc, the retainer can squeeze the ramp surface of the sealing ring through the ramp surface to fix the sealing ring.

[0028] 3. This utility model provides an emergency shut-off valve for liquid hydrogen, wherein the sealing ring and the valve disc have a stepped structure at their contact point.

[0029] This liquid hydrogen emergency shut-off valve features a stepped structure at the contact point between the sealing ring and the valve disc, increasing the contact area between them and forming a labyrinth seal to prevent liquid hydrogen from penetrating and leaking between the valve disc and the sealing ring.

[0030] 4. This utility model provides an emergency shut-off valve for liquid hydrogen. The emergency shut-off valve for liquid hydrogen also includes a guide sleeve, which is sleeved on the surface of the valve stem and limits the position of the valve stem.

[0031] This liquid hydrogen emergency shut-off valve features a guide sleeve that positions the valve stem during operation, preventing damage to the sealing ring caused by misalignment due to valve body dimensional errors. Simultaneously, the guide sleeve, positioned between the valve body and stem, prevents rapid upward flow of liquid hydrogen, thus avoiding packing freezing and increased valve opening / closing torque. It also prevents excessive hydrogen accumulation in the upper cavity of the valve body (due to liquid hydrogen evaporation and the lower density of gaseous hydrogen compared to liquid hydrogen), thus reducing the risk of higher pressure at the top compared to the bottom. Attached Figure Description

[0032] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific 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 from these drawings without creative effort.

[0033] Figure 1 This is a schematic structural view of the emergency shut-off valve for liquid hydrogen provided in an embodiment of the present invention;

[0034] Figure 2 This is a partial enlarged view of the valve disc in the emergency shut-off valve for liquid hydrogen provided in an embodiment of this utility model;

[0035] Figure 3 This is a partial enlarged view of the sealing ring in the emergency shut-off valve for liquid hydrogen provided in an embodiment of this utility model.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1-Valve body;

[0038] 2-Valve disc;

[0039] 3-Fixer;

[0040] 4-Sealing ring;

[0041] 5-Guide sleeve;

[0042] 6-Valve cover;

[0043] 8-Valve stem. Detailed Implementation

[0044] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. 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.

[0045] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0046] Example

[0047] Liquid hydrogen is mostly transported through pipelines, and gate valves are commonly used valves on liquid hydrogen transport pipelines. Gate valves play an important role in cutting off and throttling the medium in the pipeline they are in. However, due to the ultra-low temperature characteristics of liquid hydrogen, conventional gate valves on the market currently achieve sealing by directly contacting the valve core with the valve body. This single sealing method of liquid hydrogen cryogenic gate valves makes them prone to leakage.

[0048] Therefore, this embodiment provides an emergency shut-off valve for liquid hydrogen, such as... Figures 1 to 3 As shown, the device includes a valve body 1, a valve disc 2, a retainer 3, and a sealing ring 4. The valve disc 2 is located inside the valve body 1. The valve disc 2 is adapted to abut against the side wall of the flow channel opening inside the valve body 1. The retainer 3 is connected to the bottom of the valve disc 2. The sealing ring 4 is located between the valve disc 2 and the retainer 3. The sealing ring 4 is configured to protrude from the periphery of the valve disc 2. The portion of the sealing ring 4 protruding from the periphery of the valve disc 2 is adapted to abut against the side wall of the flow channel opening inside the valve body 1 and seal the flow channel opening. The depth of the side wall of the flow channel opening inside the valve body 1 is greater than the width of the portion of the sealing ring 4 protruding from the periphery of the valve disc 2.

[0049] like Figures 1 to 3As shown, the valve body 1 has a flow channel orifice inside. The valve disc 2 is used to abut against the flow channel orifice to close it, thereby cutting off the liquid inside the valve body 1. A retainer 3 is connected to the bottom of the valve disc 2, and a sealing ring 4 is provided between the valve disc 2 and the retainer 3. During installation, the retainer 3 presses the sealing ring 4 towards the valve disc 2 to fix the sealing ring 4. The portion of the sealing ring 4 protruding from the periphery of the valve disc 2 is adapted to abut against the side wall of the flow channel orifice inside the valve body 1 and close the flow channel orifice.

[0050] In this embodiment, by setting the depth of the inner flow channel sidewall of the valve body 1 to be greater than the width of the portion of the sealing ring 4 protruding from the valve disc 2, even if the sealing ring 4 fails due to excessive wear, an effective seal can still be formed by the valve disc 2 and the inner flow channel sidewall of the valve body 1, thus preventing leakage of liquid hydrogen medium.

[0051] Specifically, such as Figure 3 As shown, the sealing ring 4 abuts against the side wall of the flow channel inside the valve body 1. At this time, the width of the sealing ring 4 is significantly smaller than the depth of the side wall of the flow channel inside the valve body 1, so that the valve disc 2 can also be partially located at the side wall of the flow channel inside the valve body 1. Thus, after the sealing ring 4 fails due to excessive wear, it can ensure that the valve disc 2 and the side wall of the flow channel inside the valve body 1 are tightly fitted to form an effective seal.

[0052] In this embodiment, at least one of the contact surfaces between the sealing ring 4 and the retainer 3 is a ramp surface, and the sealing ring 4 is configured to be squeezed through the ramp surface to partially protrude from the periphery of the valve disc 2.

[0053] Specifically, such as Figure 3 In the embodiment shown, point a is a sloping surface. Therefore, when the retainer 3 presses the sealing ring 4 towards the valve disc 2, the retainer 3 can press the sloping surface of the sealing ring 4 through the sloping surface at point a, so as to achieve the compression of the sealing ring 4 without leakage.

[0054] In this embodiment, as Figure 3 As shown, a stepped structure is provided at the contact point between the sealing ring 4 and the valve disc 2. By providing a stepped structure at the contact point between the sealing ring 4 and the valve disc 2, the contact area between the sealing ring 4 and the valve disc 2 is increased, forming a labyrinth seal between them to prevent liquid hydrogen from penetrating and leaking between the valve disc 2 and the sealing ring 4.

[0055] In this embodiment, the sealing ring 4 is made of high-performance plastic. Using a high-performance plastic sealing ring 4 provides a better sealing effect than metal seals under liquid hydrogen conditions.

[0056] In this embodiment, the retainer 3 and the valve disc 2 are connected by screws, and the screw heads are spot-welded to prevent them from falling off.

[0057] In this embodiment, the emergency shut-off valve for liquid hydrogen also includes a guide sleeve 5, which is fitted onto the surface of the valve stem 8 and limits the position of the valve stem 8.

[0058] During the valve opening and closing process, the guide sleeve 5 surrounds and positions the valve stem 8, preventing damage to the sealing ring 4 when it comes into close contact with the valve body 1 due to misalignment caused by dimensional errors in the valve body 1. Simultaneously, the guide sleeve 5 fills the space between the valve body 1 and the valve stem 8, preventing the rapid upward flow of liquid hydrogen and thus avoiding packing freezing, which would increase the valve opening and closing torque. It also prevents excessive hydrogen accumulation in the upper cavity of the valve body (due to liquid hydrogen evaporation, and the lower density of gaseous hydrogen compared to liquid hydrogen), thus reducing the risk of higher pressure in the upper part compared to the lower part.

[0059] In this embodiment, as Figure 1 As shown, the emergency shut-off valve for liquid hydrogen also includes a valve cover 6, which is connected to the valve body 1. The valve stem 8 passes through the valve cover 6, and packing fills the space between the valve cover 6 and the valve stem 8.

[0060] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. An emergency shut-off valve for liquid hydrogen, characterized in that, include: Valve body (1); A valve disc (2) is disposed inside the valve body (1); the valve disc (2) is adapted to abut against the side wall of the flow channel inside the valve body (1); Fixer (3) is connected to the bottom of the valve disc (2); A sealing ring (4) is disposed between the valve disc (2) and the retainer (3). The sealing ring (4) is configured to protrude from the periphery of the valve disc (2). The portion of the sealing ring (4) protruding from the periphery of the valve disc (2) is adapted to abut against the side wall of the internal flow channel of the valve body (1) and close the flow channel. The depth of the inner flow channel sidewall of the valve body (1) is greater than the width of the portion of the sealing ring (4) protruding from the valve disc (2) around the periphery.

2. The emergency shut-off valve for liquid hydrogen according to claim 1, characterized in that, At least one of the contact surfaces between the sealing ring (4) and the fixing device (3) is a sloped surface.

3. The emergency shut-off valve for liquid hydrogen according to claim 2, characterized in that, The sealing ring (4) and the valve disc (2) are provided with a stepped structure at the contact point.

4. The emergency shut-off valve for liquid hydrogen according to claim 2 or 3, characterized in that, The sealing ring (4) is made of high-performance plastic.

5. The emergency shut-off valve for liquid hydrogen according to claim 4, characterized in that, The fixture (3) and the valve disc (2) are connected by screws, and the screw heads are spot-welded.

6. The emergency shut-off valve for liquid hydrogen according to claim 1, characterized in that, It also includes a guide sleeve (5), which is fitted onto the surface of the valve stem (8) and limits the valve stem (8).

7. The emergency shut-off valve for liquid hydrogen according to claim 6, characterized in that, The guide sleeve (5) is filled between the valve body (1) and the valve stem (8).

8. The emergency shut-off valve for liquid hydrogen according to claim 7, characterized in that, It also includes a valve cover (6), which is connected to the valve body (1), and the valve stem (8) passes through the valve cover (6).

9. The emergency shut-off valve for liquid hydrogen according to claim 8, characterized in that, It also includes packing material, which fills the space between the valve cover and the valve stem.

Images