Large-diameter low-flow resistance exhaust isolation valve

Abstract

The application relates to a large-diameter low-flow-resistance exhaust isolation valve, which comprises a shell, a valve core, a mounting seat, a piston and an elastic member. Two ends of the shell are respectively provided with an air inlet suitable for flowing-in gas and an air outlet suitable for flowing-out gas, and the shell is internally provided with a mounting seat; the piston is movably arranged in the cavity of the mounting seat and can move in the direction towards or away from the air inlet; the valve core comprises a valve rod and a conical member; one end of the valve rod is inserted into the cavity of the mounting seat and connected with the piston, the other end of the valve rod is connected with the conical member, the tip of the conical member faces the air inlet and is opposite to the center of the air inlet; an air-forcing cavity is formed in the side wall of the shell and is communicated with the cavity of the mounting seat, and when gas is introduced into the cavity of the mounting seat through the air-forcing cavity, the piston can drive the valve core to move in the direction towards the air inlet; the elastic member is arranged in the mounting seat and connected with the piston and is suitable for resetting the piston and the valve core.

Description

Technical Field

[0001] This application relates to the field of axial flow exhaust isolation valve technology, and in particular to a large-diameter, low-flow-resistance exhaust isolation valve. Background Technology

[0002] The hydrogen tank of the new-generation manned lunar rocket adopts a symmetrical exhaust design, with two symmetrically distributed hydrogen exhaust ports. An exhaust isolation valve is installed before one of these ports. This valve is closed during the ground testing and launch phase to block exhaust from that port. During the high-altitude phase, the valve is opened to achieve symmetrical exhaust. For the high exhaust flow of the hydrogen tank, a conventionally designed valve with a compact internal structure would result in significant flow resistance. Furthermore, due to the high fluidity of hydrogen and its extremely high velocity during rocket exhaust, the valve is prone to fatigue and damage from repeated fluid scouring and micro-vibrations during long-term continuous operation. This can lead to gas leaks and poor valve sealing. Therefore, a valve with low flow resistance is needed in the hydrogen tank exhaust path to improve exhaust flow.

[0003] Therefore, this application proposes a large-diameter, low-flow-resistance exhaust isolation valve to reduce the resistance to gas flow. Summary of the Invention

[0004] In view of this, this application proposes a large-diameter, low-flow-resistance exhaust isolation valve.

[0005] According to one aspect of this application, a large-diameter, low-flow-resistance exhaust isolation valve is provided, comprising: a housing, a valve core, a mounting base, a piston, and an elastic element; The housing has an inlet for gas to flow in and an outlet for gas to flow out at both ends, and a mounting base is provided inside the cavity of the housing. The piston is movably disposed within the cavity of the mounting base and can move toward or away from the air inlet; The valve core includes: a valve stem and a tapered member; one end of the valve stem extends into the cavity of the mounting seat and is connected to the piston, and the other end of the valve stem is connected to the tapered member, the tip of the tapered member facing the air inlet and opposite to the center of the air inlet; A forced ventilation chamber is provided on the side wall of the housing. The forced ventilation chamber is connected to the cavity of the mounting base. When gas is introduced into the cavity of the mounting base through the forced ventilation chamber, the piston can drive the valve core to move in the direction of the air inlet, thereby blocking the air inlet. The elastic element is located within the mounting base and connected to the piston, which is suitable for resetting the piston and valve core.

[0006] In one possible implementation, the air inlet end of the housing is provided with a sealing neck, and the shape of the tapered member is adapted to the shape of the sealing neck so that the outer wall of the tapered member can fit tightly against the inner wall of the sealing neck.

[0007] In one possible implementation, the end of the mounting base facing the air outlet is provided with an end cap.

[0008] In one possible implementation, the body of the end cap has a conical structure, with the tip of the end cap facing the air outlet and opposite to the center of the air outlet.

[0009] In one possible implementation, the top of the mounting base has multiple vent holes that communicate with the cavity of the mounting base.

[0010] In one possible implementation, the piston has an elastic element mounting groove, one end of the elastic element is inserted into the elastic element mounting groove, and the other end of the elastic element abuts against the top inner wall of the mounting seat.

[0011] In one possible implementation, the elastic element is a spring, which is fitted onto the valve stem.

[0012] In one possible implementation, the area of ​​the air outlet is larger than the area of ​​the air inlet.

[0013] In one possible implementation, the end of the housing with the air inlet has two or more flange connection holes.

[0014] Beneficial effects: The inlet of the housing is suitable for connecting to the hydrogen tank exhaust path. Gas in the hydrogen tank exhaust path enters the cavity of the housing through the inlet and flows out through the outlet. The piston moving within the mounting seat can drive the valve core to move within the housing, thereby closing or opening the inlet. Because the conical component is located inside the cavity of the housing, the gas entering the housing flows through the conical component and the mounting seat. In this application, the conical component is designed with a conical structure, and its tip is directly opposite the center of the inlet, which reduces the frontal area and thus reduces the resistance to gas flow. After the gas enters the housing, it is dispersed after passing the tip of the conical component and flows around the conical component, eventually flowing out through the outlet. At the same time, under the elastic force of the elastic component, the conical component can be pressed away from the inlet, making the conical component closely contact the mounting seat, thereby improving the positional stability of the valve core and preventing the conical component from moving and interfering with the gas flow during gas flow, further reducing flow resistance. This application achieves both gas cutoff and conduction in the hydrogen tank exhaust path while reducing the resistance of the internal valve core to the gas, ensuring that large-flow gas can pass smoothly through the inside of the housing.

[0015] Other features and aspects of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0016] The accompanying drawings, which are included in and form part of this specification, illustrate exemplary embodiments, features, and aspects of this application together with the specification and serve to explain the principles of this application.

[0017] Figure 1 This is a cross-sectional view of the large-diameter, low-flow-resistance exhaust isolation valve in the open state according to an embodiment of this application. Figure 2 This is a cross-sectional view of a large-diameter, low-flow-resistance exhaust isolation valve in the closed state according to an embodiment of this application.

[0018] Housing 100, valve core 400, piston 300, elastic element 500, air inlet 120, air outlet 130, valve stem 420, conical part 410, vent hole 220, end cap 210, connecting part 240, forced ventilation chamber 700, energy storage sealing ring 600, limit nut 620. Detailed Implementation

[0019] Various exemplary embodiments, features, and aspects of this application will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0020] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application or to simplify 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. Therefore, they should not be construed as limitations on this application.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0022] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0023] Furthermore, to better illustrate this application, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this application can be implemented without certain specific details. In some instances, methods, means, components, and circuits well-known to those skilled in the art have not been described in detail in order to highlight the main points of this application.

[0024] Figure 1 This is a cross-sectional view of the large-diameter, low-flow-resistance exhaust isolation valve in the open state according to an embodiment of this application. Figure 2 This is a cross-sectional view of a large-diameter, low-flow-resistance exhaust isolation valve according to an embodiment of this application in its closed state. Figure 1 As shown, a large-diameter, low-flow-resistance exhaust isolation valve includes: a housing 100, a mounting base 200, a valve core 400, a piston 300, and an elastic element 500; the housing 100 has an inlet 120 for inflowing gas and an outlet 130 for outflowing gas at its two ends, and the mounting base 200 is provided inside the cavity of the housing 100; the piston 300 is movably disposed in the cavity of the mounting base 200 and can move toward or away from the inlet 120; the valve core 400 includes: a valve stem 420 and a conical element 410; one end of the valve stem 420 extends into the cavity of the mounting base 200 and is connected to the piston 300, and the other end of the valve stem 420... One end is connected to a tapered member 410, the tip of which faces the air inlet 120 and is opposite to the center of the air inlet 120; a forced ventilation chamber 700 is provided on the side wall of the housing 100 and the mounting base 200, the forced ventilation chamber 700 is connected to the cavity of the mounting base 200, and is suitable for sealing the air inlet 120 by the piston 300 under the pressure of the gas when gas is introduced into the cavity of the mounting base 200 through the forced ventilation chamber 700; an elastic member 500 is provided in the mounting base 200 and connected to the piston 300, and is suitable for resetting the piston 300 and the valve core 400.

[0025] It should be noted here that this application is for an important single unit in a launch vehicle pressurization and delivery system, which is typically used for the emission and isolation of hydrogen tank gas in the pressurization and delivery system. The housing 100 provides installation space for the internal mounting base 200, valve core 400, piston 300, etc. The inlet and outlet ends of the housing 100 are suitable for connecting to the hydrogen tank exhaust path. Gas in the hydrogen tank exhaust path enters the cavity of the housing 100 through the inlet 120 and flows out through the outlet 130. The mounting base 200 provides a mounting foundation for the valve core 400 and piston 300. The piston 300's movement within the cavity of the mounting base 200 drives the valve core 400 to move within the housing 100. Since the tapered member 410 at one end of the valve core 400 is directly opposite the inlet 120, the tapered member 410 can move towards the inlet 120 and embed into the inlet end of the housing 100, thus sealing the inlet 120. At this time, the large-diameter, low-flow-resistance exhaust isolation valve is in a sealed state, preventing gas in the hydrogen tank exhaust path from flowing into the housing 100, thereby achieving a blocking effect. The function of cutting off gas flow: When the conical member 410 moves away from the air inlet 120, the conical member 410 moves away from the air inlet end of the housing 100, thereby opening the air inlet 120. At this time, the large-diameter low-flow-resistance exhaust isolation valve is in the open state, and the gas in the hydrogen tank exhaust path can flow from the air inlet 120 into the housing 100 and out from the air outlet 130, thereby playing the function of guiding gas flow. Since the conical member 410 is set inside the cavity of the housing 100, the gas entering the housing 100 will flow through the conical member 410 and the mounting base 200. In this application, the conical member 410 is set in a conical structure, and its tip is directly opposite to the center of the air inlet 120, which can reduce the windward area, thereby reducing the resistance of the conical member 410 to gas flow. After the gas entering the housing 100 flows through the tip of the conical member 410, it is dispersed and flows around the conical member 410, and finally flows out from the air outlet 130. This application achieves both gas cutoff and conduction in the hydrogen tank exhaust path while reducing the resistance of the internal valve core 400 to the gas, ensuring that high-flow gas can smoothly pass through the housing 100. The elastic element 500 is disposed inside the mounting base 200, with one end of the elastic element 500 abutting against the inner top wall of the mounting base 200 and the other end abutting against the piston 300. Under the elastic force of the elastic element 500, the mounting base 200 can be pressed tightly towards the gas outlet 130. Thus, when the gas is cut off, the elastic force of the elastic element 500 can drive the piston 300 to push the conical element 410 away from the gas inlet 120, ultimately making the conical element 410 tightly contact the mounting base 200 and achieve resetting. Furthermore, it can improve the positional stability of the valve core 400, avoid the vertical displacement of the conical element 410 during gas flow, and prevent interference with gas flow, further reducing flow resistance.

[0026] In one possible implementation, a forced ventilation cavity 700 is provided on the side wall of the housing 100 and the mounting base 200. The forced ventilation cavity 700 is connected to the cavity of the mounting base 200 and is suitable for introducing gas into the mounting base 200. It should be noted here that the forced ventilation chamber 700 penetrates the side walls of the housing 100 and the mounting base 200; one end of the forced ventilation chamber 700 is suitable for communication with an external air source device, and the other end of the forced ventilation chamber 700 is connected to the interior of the cavity of the mounting base 200. The external air source device is suitable for introducing gas into the cavity of the mounting base 200 through the forced ventilation chamber 700. As the air pressure inside the mounting base 200 continuously increases, the piston 300 overcomes the elastic force of the elastic element 500 and moves towards the air inlet 120, thereby driving the valve core 400 and its conical element 410 to move towards the air inlet 120. When the conical element 410 is in complete contact with the inner side wall of the housing 100, it blocks the air inlet 120 of the housing 100. The large-diameter, low-flow-resistance exhaust isolation valve is then closed. Under the continuous pressure of the air pressure inside the mounting base 200, the piston 300 effectively overcomes the elastic force of the elastic element 500, causing the valve core 400 to continuously press against the housing 100, providing the sealing pressure required for medium sealing, and keeping the air inlet 120 sealed. When the external air source equipment is cut off and the air is withdrawn, the air pressure inside the cavity of the mounting base 200 gradually decreases until the gas pressure is less than the elastic force of the elastic element 500. The elastic element 500 then resets and pushes the piston 300 toward the air outlet 130, simultaneously driving the valve core 400 away from the air inlet 120. At this point, the large-diameter, low-flow-resistance exhaust isolation valve is opened. Finally, the elastic force of the elastic element 500 allows the conical element 410 to contact the mounting base 200 tightly, achieving reset.

[0027] In the initial state, this application maintains a normally open state. Under the pressure of the elastic element 500 and the self-weight of the valve core 400, the conical part 410 of the valve core 400 is in close contact with the mounting seat 200, avoiding interference with the smooth flow of gas. Compared to maintaining a normally closed structure in the initial state, it is less likely for the elastic element to undergo plastic deformation, avoiding the phenomenon of poor sealing and air leakage caused by insufficient elasticity and reduced sealing pressure of the elastic element 500 in the closed state. By applying pressure with air pressure, this application can not only improve the sealing performance of the air inlet 120 in the closed state, but also make the valve core 400 tend to move towards the air outlet 130 (pressing against the mounting seat 200) in the open state, so as to ensure the gas flow efficiency and reduce the valve flow resistance.

[0028] In one possible implementation, such as Figure 2As shown, the air inlet end of the housing 100 is provided with a sealing neck 140. The shape of the conical member 410 is adapted to the shape of the sealing neck 140 so that the outer side wall of the conical member 410 can fit tightly against the inner side wall of the sealing neck 140. The air inlet 120 and the air outlet 130 of the housing 100 are directly opposite each other. The main body of the housing 100 has a cylindrical structure, and the position near the air inlet 120 has a smoothly transitioning tapered structure to form the sealing neck 140. The inner wall of the sealing neck 140 is a smooth sealing surface, which is suitable for close contact with the outer side wall of the conical member 410.

[0029] Furthermore, the area of ​​the outlet 130 is larger than that of the inlet 120, creating a gradually expanding flow channel cross-section. This effectively reduces the flow resistance of the gas as it flows from the inlet 120 to the outlet 130, ensuring that the valve cavity does not become a throttling point in the system flow channel.

[0030] In one possible implementation, the area of ​​the outlet 130 minus (the maximum cross-sectional area of ​​the conical member 410 + the cross-sectional area of ​​the connecting portion 240) equals the flow area within the housing 100; the flow area within the housing 100 is greater than the inlet area to ensure no additional flow resistance is generated. Preferably, the gas flow area within the housing 100 is greater than 20% of the inlet area.

[0031] In one possible implementation, the end of the housing 100 with the air inlet 120 is provided with a flange connecting plate, and the flange connecting plate has multiple flange connection holes 110 arranged sequentially along the circumference of the flange connecting plate. It should be noted that the housing 100 can be fixedly connected to the hydrogen tank exhaust pipe through the flange connecting plate.

[0032] In one possible implementation, the main body of the mounting base 200 is cylindrical with a hollow cavity inside. The end of the mounting base 200 near the air inlet 120 is provided with a through pipe 250 through which the valve core 400 passes. The through pipe 250 extends into the interior of the mounting base 200, and the inner cavity of the through pipe 250 is connected to the interior of the cavity of the mounting base 200. The valve stem 420 of the valve core 400 is matched with the through pipe 250. The valve stem 420 passes through the inner cavity of the through pipe 250 and extends into the interior of the cavity of the mounting base 200 and is fixedly connected to the piston 300. The through pipe 250 is designed to guide and limit the movement of the valve core 400, ensuring that the valve stem 420 moves along its length without deviation.

[0033] In one possible implementation, the top of the mounting base 200 is provided with multiple vent holes 220, which are connected to the cavity of the mounting base 200. It should be noted that the vent holes 220 are provided to ensure that the piston 300 can move normally within the mounting base 200. Gas can enter and exit the mounting base 200 through the vent holes 220, thereby avoiding obstruction of the piston 300's movement due to air pressure.

[0034] Furthermore, multiple vent holes 220 are arranged in a ring along the circumference of the top surface of the mounting base 200.

[0035] In one possible implementation, the mounting base 200 has an annular weight-reducing groove 230 on the side facing the tapered member 410. This is intended to effectively reduce the structural mass while ensuring the main strength and structural integrity of the mounting base 200. This lightweight design helps to reduce the static load of the entire valve and can also alleviate the inertial influence of the piston 300 during operation to a certain extent, thereby improving the dynamic response performance and operational sensitivity of the valve.

[0036] In one possible implementation, the mounting base 200 is provided with an end cap 210 at the end facing the air outlet 130. The open end of the end cap 210 is fastened to the end of the mounting base 200 facing the air outlet 130, thereby sealing the cavity inside the mounting base 200. Furthermore, the end cap 210 and the mounting base 200 are fixed with 12 circumferentially distributed M6 bolts.

[0037] In one possible implementation, the main body of the end cap 210 is a conical structure, with the tip of the end cap 210 facing the air outlet 30 and opposite to the center of the air outlet 130. By setting the end cap 210 at the bottom of the mounting base 200 in a conical structure, the conical spatial construction effectively increases the cross-sectional area and local accommodating space of the air outlet, thereby reducing the obstruction encountered by the gas flow when passing through the end of the mounting base 200. Furthermore, the gradually contracting guide shape of the cone towards the tip guides and promotes the smooth convergence of gas inside the cavity of the housing 100 towards the center, ensuring that the gas can be quickly and efficiently drawn out from inside the housing 100, effectively reducing overall flow resistance and improving exhaust efficiency.

[0038] Preferably, the main body of the end cap 210 has a conical structure, and the tip of the end cap 210 is rounded; the tip of the end cap 210 is located at the center of the air outlet 130.

[0039] In one possible implementation, such as Figure 2 As shown, a sealing gasket 211 is provided between the end cap 210 and the mounting base 200 to ensure the reliability of the structural sealing and airtight performance of the joint between the two. Preferably, the sealing gasket 211 is a copper metal gasket.

[0040] In one possible implementation, the mounting base 200 is disposed on the inner sidewall of the housing 100. Further, the mounting base 200 is connected to the housing 100 via a connecting portion 240. The main body of the connecting portion 240 is a cylindrical or cuboid block structure; one side of the connecting portion 240 is fixedly connected to the inner wall of the housing 100, and the other side of the connecting portion 240 is fixedly connected to the mounting base 200; under the support of the connecting portion 240, the mounting base 200 can be suspended in the middle of the housing 100.

[0041] Preferably, the housing 100, the connecting part 240, and the mounting base 200 are integrally formed, thus constituting a compact, robust, and durable integral component. This not only significantly improves the structural strength and overall stability of the valve but also effectively eliminates assembly errors, loosening, and leakage risks that may arise from separate connections. It allows the connecting part 240 and the mounting base 200 to be securely and precisely suspended in the middle position of the housing 100, providing a solid guarantee for the long-term reliable sealing of the valve in the harsh operating environment of liquid hydrogen temperatures.

[0042] In one possible implementation, the forced ventilation chamber 700 sequentially passes through the housing 100, the connecting portion 240, and the mounting base 200, thereby communicating with the cavity 800 of the mounting base 200. Further, the forced ventilation chamber 700 includes: an inlet chamber 710, a through chamber 720, and an intake chamber 730 sequentially connected; the main body of the inlet chamber 710 has a frustum-shaped perforated structure, with its large opening facing outwards and its small opening connecting to the through chamber 720. This shape facilitates the smooth entry and gradual acceleration of gas, reducing eddies and pressure loss at the inlet. The main bodies of the through chamber 720 and the intake chamber 730 both have cylindrical perforated structures, ensuring the regularity and smoothness of the internal flow channels. Furthermore, the end face diameter of the intake chamber 730 is smaller than that of the through chamber 720. This gradually narrowing transition structure can appropriately constrain and guide the airflow, allowing an external pressure-stabilized gas source to stably supply gas to the forced ventilation chamber.

[0043] In one possible implementation, such as Figure 2 As shown, the inner wall of the mounting base 200 is provided with a frustum-shaped guide surface 212. The guide surface 212 is designed to gradually expand from the air inlet 120 to the air outlet 130. The guide surface 212 is located on the side of the ventilation forced cavity 700 near the end cover 210. It is used to optimize the airflow guidance path. When the airflow is released from the ventilation forced cavity 700, the guide surface 212 can effectively receive and guide the airflow to diffuse smoothly towards the end cover 210, so that it can enter the lower space inside the cavity 800 of the mounting base 200 more efficiently and evenly. This makes it easier for the airflow to fill the target area in time. It can also play a buffering and stabilizing role in the gas flow process, reducing the turbulence caused by sudden changes in flow direction or direct impact on the mounting base 200.

[0044] In one possible implementation, one end of the valve stem 420 is fixedly connected to the piston 300, and the other end of the valve stem 420 is fixedly connected to the inner center of the conical member 410. The valve stem 420 acts as a connecting bridge between the conical member 410 and the piston 300, transmitting the movement of the piston 300 to the conical member 410. Preferably, the valve stem 420 and the conical member 410 are integrally formed, eliminating assembly gaps or loose connections between the valve stem 420 and the conical member 410, greatly improving the coaxiality and structural rigidity between components, and ensuring the long-term sealing performance and operational safety of the entire exhaust isolation valve.

[0045] Furthermore, the main body of the conical component 410 has a conical structure, which can guide the airflow to flow smoothly along its conical surface and effectively reduce vortex phenomena. In order to further optimize the flow characteristics, the tip of the conical component 410 has a smooth rounded corner design; it significantly reduces the additional pressure loss caused by the abrupt change in cross-section when the airflow passes through the conical component 410, thereby further reducing the overall flow resistance and improving the flow efficiency of the valve.

[0046] The tapered component 410, valve stem 420, mounting base 200, piston 300, and housing 100 are coaxially arranged, and the maximum width of the tapered component 410 is the same as the outer diameter of the mounting base 200, ensuring that the side walls of the tapered component 410 and the mounting base 200 are located in the same curved surface when they are in contact with each other.

[0047] Preferably, the interior of the conical member 410 is a cavity, and the lower center of the conical member 410 is connected to the top of the valve stem 420. The apex angle of the conical member 410 is in the range of 125°±10°.

[0048] In one possible implementation, the main body of the valve stem 420 is cylindrical; the bottom end of the valve stem 420 protrudes and is provided with a connecting screw 422, which passes through the fixing hole at the bottom center of the mounting base 200. The fixing nut 421 is threaded onto the connecting screw 422 and connected to the bottom surface of the mounting base 200, thereby connecting the valve stem 420 to the mounting base 200.

[0049] The diameter of the connecting screw 422 is smaller than the diameter of the valve stem 420.

[0050] In one possible implementation, the piston 300 has a cavity with one end open, and the open end of the piston 300 faces the air inlet 120 of the housing 100. A fixing hole is provided at the center of the bottom of the piston 300, and the connecting screw 422 of the valve stem 420 is adapted to pass through the fixing hole at the bottom of the piston 300.

[0051] In one possible implementation, the valve stem 420 is fixedly connected to the piston 300 by a retaining nut 421, such as... Figure 1As shown, the fixing nut 421 is coaxially arranged with the fixing hole, and the connecting screw 422 is sequentially inserted into the fixing hole at the bottom of the piston 300 and the screw hole of the fixing nut 421, and is threadedly connected to the fixing nut 421, thereby realizing the fixed connection between the valve stem 420 and the piston 300.

[0052] In one possible implementation, an energy storage seal ring 600 is provided between the piston 300 and the mounting base 200. The energy storage seal ring 600 matches the piston 300 and is sleeved on the outer side wall of the piston 300, and the energy storage seal ring 600 is placed on the outer protrusion of the piston 300. It should be noted that the outer side of the energy storage seal ring 600 is in close contact with the inner side wall of the mounting base 200, which can compensate for the eccentricity of the piston 300 during movement and prevent wear between the mounting base 200 and the piston 300, and ensure that the incoming gas does not escape into the upper cavity of the mounting base 200.

[0053] Preferably, the energy storage sealing ring 600 is a low-temperature resistant spring energy storage sealing ring.

[0054] In one possible implementation, a limiting nut 620 is provided on the outer side of the piston 300 and is located above the energy storage sealing ring 600. The outer side wall of the piston 300 is provided with a threaded structure. The limiting nut 620 matches the piston 300. The limiting nut 620 is sleeved on the piston 300 and threadedly connected to the piston 300. It should be noted that the setting of the limiting nut 620 is used to limit the energy storage sealing ring 600 below, so as to prevent the energy storage sealing ring 600 from being displaced or even falling off the piston 300 when the piston 300 moves in the mounting seat 200.

[0055] It should be noted that if the ventilation forced chamber 700 stops supplying air, the pressure inside the ventilation forced chamber 700 will drop; therefore, air supply must be continuous when the valve is closed to keep the pressure in the ventilation forced chamber 700 constant in order to ensure the sealing force of the main valve.

[0056] In one possible implementation, such as Figure 2 As shown, the piston 300 has an elastic element mounting groove 310; one end of the elastic element 500 is inserted into the elastic element mounting groove 310, and the other end of the elastic element 500 abuts against the top inner wall of the mounting base 200. It should be noted that the top inner wall of the mounting base 200 has a protruding elastic element limiting ring, which matches the inner diameter of the elastic element 500. The limiting ring is located inside the elastic element 500. Under the limiting action of the limiting ring and the elastic element mounting groove 310 on both ends of the elastic element 500, the elastic element 500 will not displace during compression and extension, ensuring that the elastic element 500 can apply a vertical force to the piston 300.

[0057] Preferably, the elastic element 500 is a spring made of common stainless steel (e.g., 1Cr18Ni9Ti), and is sleeved on the outside of the through pipe 250. The sleeved arrangement ensures that the inner diameter of the spring matches the outer diameter of the through pipe 250, so that the spring can stably surround the through pipe 250. Thus, during axial compression and rebound, the elastic force generated by the spring can be effectively transmitted to the piston 300 and the mounting seat 200, providing continuous elastic support and reset force for the vertical movement of the piston 300.

[0058] The air source equipment inputs forced air pressure into the mounting base 200 through the forced air chamber 700, which acts on the piston 300 to generate upward force. The forced air pressure needs to overcome the force generated by the gas pressure in the exhaust pipe acting on the air inlet 200 and the spring force, and also needs to provide sufficient sealing pressure to ensure valve sealing.

[0059] The forced air pressure inside the mounting base 200 is determined by the formula A2×P2=A1×P1+F. 弹 +F mf Perform the calculations; where A1 is the area of ​​the intake port 120, P1 is the gas pressure in the exhaust pipe, A2 is the cross-sectional area of ​​the piston 300, P2 is the forced air pressure, and F... 弹 It is the spring force, F mf It refers to the sealing force (the specific value is determined based on actual needs).

[0060] In one possible implementation, the housing 100, mounting base 200, valve core 400, and piston 300 can all be made of common aluminum alloy materials (e.g., 5A06).

[0061] This application possesses the following main technical specifications and core features: (1) The diameter of the air inlet 120 is Φ80mm. This size can meet the system's requirements for large flow of gas, while also taking into account the compactness of the valve structure; (2) The operating temperature range is 20K to 323K, which can adapt to the extremely low temperature (about 20K) environment encountered in the storage and transportation of liquid hydrogen, and is compatible with operating conditions near room temperature; (3) The working pressure range is 0.08MPa to 0.4MPa, covering the pressure span from low back pressure start-up to normal operating conditions, ensuring that the valve can be stably opened, closed and sealed under different system pressures; (4) Applicable media include, but are not limited to, liquid hydrogen, hydrogen gas and helium gas; (5) Excellent flow resistance characteristics. The flow resistance is only 8 kPa under rated operating conditions. The low flow resistance loss helps to improve the efficiency of the entire exhaust system and reduce energy consumption, reflecting its "low flow resistance" design advantage.

[0062] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A large-diameter, low-flow-resistance exhaust isolation valve, characterized in that, include: Housing, valve core, mounting base, piston, and elastic element; The housing has an air inlet for inflowing gas and an air outlet for outflowing gas at both ends, and the mounting base is provided inside the cavity of the housing. The piston is movably disposed within the cavity of the mounting base and can move toward or away from the air inlet. The valve core includes: a valve stem and a tapered component; One end of the valve stem extends into the cavity of the mounting base and is connected to the piston, and the other end of the valve stem is connected to the tapered member, with the tip of the tapered member facing the air inlet and opposite to the center of the air inlet; The sidewall of the housing and the sidewall of the mounting base are provided with ventilation forced chambers. The ventilation forced chambers are connected to the cavity of the mounting base. When gas is introduced into the cavity of the mounting base through the ventilation forced chambers, the piston can drive the valve core to move in the direction toward the air inlet, thereby blocking the air inlet. The elastic element is disposed within the mounting base and connected to the piston, and is suitable for resetting the piston and the valve core.

2. The large-diameter, low-flow-resistance exhaust isolation valve according to claim 1, characterized in that, The air inlet end of the housing is provided with a sealing neck, and the shape of the conical member is adapted to the shape of the sealing neck so that the outer side wall of the conical member can fit tightly with the inner side wall of the sealing neck.

3. The large-diameter, low-flow-resistance exhaust isolation valve according to claim 1, characterized in that, The mounting base is provided with an end cap at the end facing the air outlet.

4. The large-diameter, low-flow-resistance exhaust isolation valve according to claim 3, characterized in that, The main body of the end cap has a conical structure, and the tip of the end cap faces the air outlet and is opposite to the center of the air outlet.

5. A large-diameter, low-flow-resistance exhaust isolation valve according to claim 1, characterized in that, The top of the mounting base has multiple vent holes, which are connected to the cavity of the mounting base.

6. A large-diameter, low-flow-resistance exhaust isolation valve according to claim 1, characterized in that, The piston has an elastic element mounting groove, one end of the elastic element is inserted into the elastic element mounting groove, and the other end of the elastic element abuts against the top inner wall of the mounting base.

7. A large-diameter, low-flow-resistance exhaust isolation valve according to claim 6, characterized in that, The elastic element is a spring, and the spring is sleeved on the valve stem.

8. A large-diameter, low-flow-resistance exhaust isolation valve according to claim 6, characterized in that, The area of ​​the air outlet is larger than the area of ​​the air inlet.

9. A large-diameter, low-flow-resistance exhaust isolation valve according to claim 1, characterized in that, The housing has two or more flange connection holes at one end where the air inlet is located.

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