Low-pressure zero-leakage impact-resistant one-way valve structure

Abstract

The utility model belongs to the technical field of aviation fuel systems, and discloses a low-pressure zero-leakage impact-resistant one-way valve structure which comprises a cylindrical pin, an inlet pipe nozzle, a valve assembly and a torsional spring. A cylindrical pin is arranged on the side wall face above an opening of the inlet pipe nozzle, one end of the valve assembly is connected with the cylindrical pin shaft, the other end of the valve assembly is a valve with a sealing face, the torsional spring is wound on the cylindrical pin, one end of the torsional spring is matched with the inlet pipe nozzle, and the other end of the torsional spring is matched with the valve assembly. The elastic force of the torsion spring enables the valve assembly to be pressed outside the opening of the inlet pipe nozzle. By improving the structure of the rocker arm, adding the variable cross-section reinforcing ribs on the rocker arm, arranging the spring pre-tightening structure, arranging the low-rigidity torsion spring and adding the torsion spring mounting and positioning holes, the minimum starting pressure fluctuation caused by the displacement of the torsion spring can be effectively prevented, the service life of the torsion spring is prolonged, the internal sealing performance is improved, and faults are reduced; reverse zero leakage of the minimum starting pressure is achieved, the impact resistance is high, the service life is long, surge is avoided, and the safety and reliability of the device are improved.

Description

Technical Field

[0001] This utility model belongs to the field of aviation fuel system technology, and relates to a self-sealing one-way valve, and more particularly to a low-pressure zero-leakage impact-resistant one-way valve structure. Background Technology

[0002] The low-pressure check valve in the fuel system is an essential component, functioning to supply and shut off fuel. The minimum starting pressure and internal sealing performance of the check valve are crucial parameters that cannot be ignored. A lower minimum starting pressure (less than 1.9 kPa) makes it more difficult to guarantee internal sealing performance (at a reverse pressure of 0.49 kPa). Furthermore, the lower the minimum starting pressure, the more susceptible the check valve is to significant fluid impact during opening and closing, placing higher demands on the valve's structural impact resistance.

[0003] In existing structures, the first type uses a valve + cylindrical pin + valve seat to rotate the valve, thereby controlling its opening, closing, and sealing. In this structure, the opening pressure matches the valve weight. Because there is no pre-pressure generated by elastic elements on the valve, the opening pressure is generally low, making it suitable for situations where leakage requirements are not stringent. Furthermore, since the rocker arm is made of a uniformly thick metal plate, typically 0.8~1.0mm thick, its thinness allows it to deform under the transient impact of the inlet medium. This deformation affects the contact of the valve's sealing surface, consequently impacting the minimum opening force and internal sealing performance.

[0004] In the existing structure, the second structural form achieves valve rotation through a combination of a valve, a cylindrical pin, a valve seat, and a torsion spring, thereby controlling the valve's opening, closing, and sealing. In this structure, the valve torsion spring acts directly on the valve. Although this eliminates the rocker arm structure and solves the problem of rocker arm deformation, due to the limitations of the product structure, the torsion spring acts directly on the valve. Because the torsion spring, at different torsion spring angles, rotates around the cylindrical pin during opening and closing, and because there is a radial clearance between the inner diameter of the torsion spring and the cylindrical pin, and an axial clearance between the length of the torsion spring and the cylindrical pin, the torsion spring will move radially and axially. This causes the pressure point of the torsion spring acting on the valve to shift accordingly, resulting in unstable opening pressure. After the first opening and closing, subsequent opening and closing cycles show pressure fluctuations of 11%. Furthermore, after a period of repeated opening and closing, wear and indentations will appear on the contact surface between the torsion spring and the valve, affecting both appearance and lifespan.

[0005] In the existing structure, when a reverse low pressure (0.49 kPa pressure) is applied to the inside of the low-pressure one-way valve, leakage (3~5 ml) occurs inside the one-way valve, which cannot guarantee the requirement of zero leakage. Moreover, after durability environmental tests such as life and vibration, the leakage of the one-way valve increases, and leakage of varying degrees occurs inside, which cannot meet the increasingly stringent reliability requirements of civil aviation components. Utility Model Content

[0006] To address the aforementioned issues, this invention provides a low-pressure, zero-leakage, impact-resistant one-way valve structure, achieving an impact-resistant, zero-leakage, highly reliable, and long-life valve structure, which can also better realize product functions and performance.

[0007] The technical solution of this utility model is as follows:

[0008] A low-pressure, zero-leakage, impact-resistant one-way valve structure includes a cylindrical pin, an inlet nozzle, a valve assembly, and a torsion spring. A cylindrical pin is provided on the side wall above the opening of the inlet nozzle. One end of the valve assembly is connected to the cylindrical pin shaft, and the other end of the valve assembly is a valve with a self-sealing surface. The torsion spring is wound around the cylindrical pin. One end of the torsion spring cooperates with the inlet nozzle, and the other end of the torsion spring cooperates with the valve assembly. The elastic force of the torsion spring causes the valve assembly to press against the opening of the inlet nozzle.

[0009] Furthermore, the valve assembly is specifically a pressure-sealed valve, and the sealing surface of the pressure-sealed valve is a sealing surface that integrates structural sealing.

[0010] Furthermore, the valve assembly also includes a rocker arm, which is connected to a cylindrical pin. The lower end of the rocker arm is provided with a mounting hole that mates with the pressure-sealed valve. The connection structure is connected and fixed to the pressure-sealed valve through the mounting hole.

[0011] Furthermore, the rocker arm is also provided with a full-circumference reinforcing rib; specifically, the full-circumference reinforcing rib extends downward from the upper left of the rocker arm, all the way to the upper left position of the mounting hole at the lower end of the rocker arm, then circles around the mounting hole and returns to the upper right position of the mounting hole at the lower end of the rocker arm, and then extends upward to the upper right of the rocker arm.

[0012] Furthermore, the structure of the valve assembly in conjunction with the torsion spring is a torsion spring arm mounting and positioning hole on the rocker arm, specifically located on the circumferential reinforcing rib of the rocker arm.

[0013] Furthermore, the side wall above the opening of the inlet nozzle is provided with a lug for installing a cylindrical pin, and the structure for the inlet nozzle to cooperate with the torsion spring is located next to the lug. The structure for cooperating with the torsion spring is the torsion spring torsion arm mounting positioning hole.

[0014] Furthermore, the inlet nozzle opening is equipped with a protruding flow guide structure.

[0015] Technical effects of this utility model:

[0016] This invention improves the rocker arm structure by adding variable cross-section reinforcing ribs, a spring preload structure, a low-stiffness torsion spring, and adding torsion spring mounting and positioning holes. This effectively prevents fluctuations in minimum starting pressure caused by torsion spring movement, increases torsion spring life, enhances internal sealing, reduces malfunctions, and simultaneously achieves the following: lower minimum starting pressure (less than 1.9 kPa), low pressure (0.49 kPa), zero reverse leakage, high impact resistance, long life, avoidance of surge, and improved safety and reliability of the device. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic cross-sectional view of a one-way valve structure according to this utility model;

[0019] Figure 2 This is a schematic cross-sectional view of the structure of a one-way valve assembly according to this utility model;

[0020] Figure 3 This is a schematic diagram of a one-way valve rocker arm according to this utility model;

[0021] Figure 4 This is a schematic diagram of a one-way valve pressure-sealed valve structure according to the present invention;

[0022] Figure 5 This is a schematic diagram of a one-way valve inlet nozzle according to this utility model;

[0023] Among them, 1-cylindrical pin, 2-outer nut, 3-retaining ring, 4-inlet nozzle, 5-sealing ring, 6-valve assembly, 7-torsion spring, 8-outlet nozzle;

[0024] 4.1 — Torsion spring torsion arm mounting and positioning hole; 4.2 — Flow guiding structure;

[0025] 6.1-Rocker arm, 6.2-Lower gasket, 6.3-Pressure-sealed valve, 6.4-Upper gasket, 6.5-Torsion spring arm mounting and positioning hole, 6.6-Reinforcing rib along the entire circumference, 6.7-Mounting hole. Detailed Implementation

[0026] This section describes embodiments of the present invention, used to explain and illustrate the technical solutions of the present invention. Unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0027] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating directions or positional relationships, are based on the orientation or positional relationships in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or device referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include more than one of those features. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integrated connection; they can refer to a mechanical connection or a point connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] Example 1:

[0030] A low-pressure, zero-leakage, impact-resistant one-way valve structure includes a cylindrical pin 1, an inlet nozzle 4, a valve assembly 6, and a torsion spring 7. The cylindrical pin 1 is provided on the side wall above the opening of the inlet nozzle 4. One end of the valve assembly 6 is axially connected to the cylindrical pin 1, and the other end of the valve assembly 6 is a valve with a self-sealing surface. The torsion spring 7 is wound around the cylindrical pin 1. One end of the torsion spring 7 cooperates with the inlet nozzle 4, and the other end of the torsion spring 7 cooperates with the valve assembly 6. The elastic force of the torsion spring 7 causes the valve assembly 6 to press against the opening of the inlet nozzle 4.

[0031] The valve assembly 6 is specifically the pressure-sealed valve 6.3, whose sealing surface is an integrated structural sealing surface.

[0032] The valve assembly 6 also includes a rocker arm 6.1, which is connected to the cylindrical pin 1. The lower end of the rocker arm 6.1 is provided with a mounting hole 6.7 that mates with the pressure-sealed valve 6.3. The connection structure is connected and fixed to the pressure-sealed valve 6.3 through the mounting hole 6.7.

[0033] The rocker arm 6.1 is also provided with a full-circumference reinforcing rib 6.6; the full-circumference reinforcing rib 6.6 is specifically: extending downward from the upper left of the rocker arm 6.1, all the way to the upper left of the mounting hole 6.7 at the lower end of the rocker arm 6.1, then around the mounting hole 6.7 once and returning to the upper right of the mounting hole 6.7 at the lower end of the rocker arm 6.1, and then extending upward to the upper right of the rocker arm 6.1.

[0034] The structure of the valve assembly 6 and the torsion spring 7 is provided by the torsion spring arm mounting and positioning hole 6.5 on the rocker arm 6.1. Specifically, the torsion spring arm mounting and positioning hole 6.5 is provided on the full-circumference reinforcing rib 6.6 of the rocker arm 6.1.

[0035] The side wall above the opening of the inlet nozzle 4 is provided with a lug for installing the cylindrical pin 1. The structure of the inlet nozzle 4 cooperating with the torsion spring 7 is located next to the lug. The structure cooperating with the torsion spring 7 is the torsion spring torsion arm mounting positioning hole 4.1.

[0036] The inlet nozzle 4 opening is equipped with a protruding guide structure 4.2.

[0037] Example 2:

[0038] A valve structure comprises a cylindrical pin 1, a nut 2, a retaining ring 3, an inlet nozzle 4, a sealing ring 5, a valve assembly 6, a torsion spring 7, an outlet nozzle 8, and other components. The valve assembly includes a rocker arm 6.1, a lower washer 6.2, a pressure-sealed valve 6.3, and an upper washer 6.4.

[0039] A new type of valve structure features a rocker arm 6.1 with two variable cross-section reinforcing ribs symmetrically added circumferentially along the outer side of the valve assembly 6. Compared to existing rocker arms, the material thickness is reduced by 37.5% (from 0.8mm to 0.5mm), and the weight of the new rocker arm structure is reduced by 34%. Furthermore, rounded corners are used for weak, bent parts (rounded corners R0.0.2~0.8 are added to concave areas, and rounded corners R0.1~0.7 are added to convex areas), increasing the rocker arm stiffness by four times. This allows the rocker arm to connect the valve, gasket, and torsion spring, and support the entire valve, thus improving impact resistance.

[0040] A valve structure includes a torsion spring mounting hole on the rocker arm and at the inlet nozzle. One end of the torsion spring is inserted into the rocker arm mounting hole, and the other end into the inlet nozzle mounting hole, preventing excessive wear caused by direct contact between the torsion spring arm and the valve. The mounting hole and the torsion spring wire have a clearance of (0.66~0.86) mm. The torsion spring acts on the rocker arm, providing the valve with pre-torque, ensuring minimum opening and closing pressure, and improving the valve's internal sealing. Compared to the traditional design where the clearance between the torsion spring length and the valve installation length is 1.7 mm, this effectively reduces the axial movement of the torsion spring (by 64.7%), overcomes the fluctuations in opening pressure after multiple openings, and provides vibration damping and buffering.

[0041] By rationally setting the pre-torsion angle of the torsion spring acting on the valve, the wire diameter, number of turns, structural parameters, torsion spring connection structure, rubber sealing pressure, rocker arm center of mass, and other comprehensive factors, it is possible to simultaneously meet the requirement of zero leakage inside the one-way valve under the minimum starting pressure (<1.9kPa) (reverse low pressure (0.49kPa pressure)).

[0042] A valve structure is provided, wherein the valve assembly is provided with two gaskets of different thicknesses. The pressure-sealed valve is placed flat on the tooling gaskets, and the valve, gaskets, and rocker arm are pressed together. Figure 5 Assembly involves inserting the fine end of a tooling punch into the valve's positioning hole and striking the tooling with a hammer until the pressure-sealed valve port is forced open, achieving a reliable connection between the rocker arm, gasket, and pressure-sealed valve. Compared to traditional threaded connections, this overcomes the problem of loosening of the thread tightening torque during vibration, thus providing resistance to impact vibration and ensuring a reliable connection.

[0043] A valve structure is provided with an annular groove on a metal valve and a vulcanized rubber material. The rubber material is designed in the shape of a hook and protrudes (0.28~0.48) mm from the metal sealing surface. When the valve is subjected to reverse pressure, the squeezed rubber material fills the annular groove, increasing the sealing contact area and making the low-pressure internal sealing performance of the device more reliable.

[0044] A valve structure is provided in which the length of the cylindrical pin is slightly less than the chord length corresponding to the outlet housing, ensuring that the cylindrical pin will not fall off under vibration and impact. Compared with the traditional structure, which uses one end of the cylindrical pin to be pressed or the other end to be interference fit, making it non-removable and difficult to repair and replace, this structure allows the cylindrical pin to be removed and replaced, making maintenance convenient and reducing costs.

[0045] A valve structure is provided, in which a steel wire is connected to an inlet nozzle via an outer nut. During assembly, a low-temperature lubricant is applied to the annular groove of the inlet nozzle, which is then inserted into the positioning groove. A guide ring is used to position the retaining ring, and the end of the guide rod is struck with a hammer. When the retaining ring enters half the length of the annular groove, the device is fixed with a vise. A 3mm diameter drill bit is mounted in reverse on a bench drill press (drill rod downwards). The drill press handwheel is operated, and the head of the drill rod is used to press down on the retaining ring, ensuring that the end of the retaining ring is sunk 0.1~0.2mm into the nut plane.

[0046] A valve structure with a 135° smooth transition section at the outlet reduces media disturbance at the outlet and lowers local media flow resistance.

[0047] A valve structure with a low-stiffness torsion spring solves the valve surge caused by unstable medium flow in the upstream and downstream systems; and matched with the internal structure, it achieves a long service life (85,000 opening and closing cycles) for the entire product.

[0048] A valve structure with a flow guiding structure at the inlet nozzle reduces media disturbance, lowers local pressure drop, and improves product flow characteristics.

[0049] A valve structure with an O-ring at the threaded connection between the inlet and outlet nozzles to ensure external sealing.

[0050] A valve structure, which consists of a rocker arm, torsion spring, gasket, valve, and cylindrical pin, is designed using static balance and transient impact design theory. This design is superior to existing structural designs (static balance), achieving low-pressure zero leakage, stable minimum starting pressure, and improved impact resistance and lifespan by more than 26%.

[0051] Example 3:

[0052] refer to Figure 1 , Figure 2 A one-way valve mainly consists of a cylindrical pin 1, an outer nut 2, a retaining ring 3, an inlet nozzle 4, a sealing ring 5, a valve assembly 6, a torsion spring 7, and an outlet nozzle 8. The valve assembly includes a rocker arm 6.1, a gasket 6.2, a pressure-sealed valve 6.3, and a gasket 6.4.

[0053] The one-way valve is used in aviation fuel systems. The valve rotates around a cylindrical pin and, under the action of a sealing torsion spring, presses against the mating surface to seal. When the oil pressure is high, the oil acts on the valve. When the force difference between the two sides of the valve reaches the opening requirement, the oil overcomes the torsion spring force, causing the valve to rotate upwards, connecting the inlet and outlet. The oil pressure overcomes the torsion spring force to open the valve. When closing is required, if the oil supply stops or the oil pressure is insufficient to overcome the torsion spring force, the valve returns to its original position under the action of the torsion spring force, pressing against the mating surface to seal.

[0054] refer to Figure 1 , Figure 3 The rocker arm structure incorporates a torsion spring mounting and positioning hole, providing installation space for one end of the torsion spring. During installation, the fixed end of the torsion spring is inserted into the mounting hole of the inlet valve seat. This prevents incorrect installation, reduces spring movement on the rocker arm, and avoids excessive wear caused by direct contact between the torsion spring and the valve. This results in stable valve performance and improved durability. The torsion spring provides accurate axial preload, effectively preventing and improving reverse sealing, and also provides vibration damping and buffering, preventing frequent valve impacts on the housing and extending the lifespan of both the valve and the torsion spring. The rocker arm structure features symmetrical variable cross-section reinforcing ribs along the outer circumference of the rocker arm. Compared to existing structures, this reduces material thickness by 37.5%, weight by 34%, and increases stiffness by 4 times. Rounded corners are used for weak points and bending areas, enabling the rocker arm to connect the valve, gasket, and torsion spring, and support the entire valve, improving its impact resistance and reliability.

[0055] refer to Figure 4The metal valve is equipped with an annular groove and filled with vulcanized rubber. The rubber is designed in the shape of a hook, with the rubber protruding (0.28~0.48) mm from the metal sealing surface. When the valve is subjected to reverse pressure, the squeezed rubber fills the annular groove, increasing the sealing contact area and making the low-pressure internal sealing performance of the device more reliable.

[0056] refer to Figure 5 The valve assembly includes two gaskets of different thicknesses. The pressure-sealed valve is placed flat on the tooling gaskets, and the fine end of the tooling punch is inserted into the valve's positioning hole. The tooling is then struck with a hammer until the pressure-sealed valve port is forced open, achieving a reliable connection between the rocker arm, gaskets, and pressure-sealed valve. Compared to traditional threaded connections, the product's thread tightening torque will not loosen during vibration, thus providing resistance to impact and vibration and ensuring a reliable connection.

[0057] The inlet nozzle is equipped with a flow guiding structure to reduce media disturbance, achieve internal pressure stabilization, reduce local pressure drop, and improve product flow characteristics.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should be covered within the protection scope of this utility model.

Claims

1. A low-pressure, zero-leakage, impact-resistant one-way valve structure, characterized in that, It includes a cylindrical pin (1), an inlet nozzle (4), a valve assembly (6), and a torsion spring (7); a cylindrical pin (1) is provided on the side wall above the opening of the inlet nozzle (4), one end of the valve assembly (6) is connected to the cylindrical pin (1) shaft, and the other end of the valve assembly (6) is a valve with a self-sealing surface. The torsion spring (7) is wrapped around the cylindrical pin (1), one end of the torsion spring (7) is engaged with the inlet nozzle (4), and the other end of the torsion spring (7) is engaged with the valve assembly (6). The elastic force of the torsion spring (7) causes the valve assembly (6) to press against the opening of the inlet nozzle (4).

2. The low-pressure, zero-leakage, impact-resistant one-way valve structure according to claim 1, characterized in that, The valve assembly (6) is specifically a pressure-sealed valve (6.3), and the sealing surface of the pressure-sealed valve (6.3) is a sealing surface that integrates structural sealing.

3. The low-pressure, zero-leakage, impact-resistant one-way valve structure according to claim 2, characterized in that, The valve assembly (6) also includes a rocker arm (6.1), which is connected to a cylindrical pin (1) shaft. The lower end of the rocker arm (6.1) is provided with a mounting hole (6.7) that mates with the pressure-sealed valve (6.3). The connection structure is connected and fixed to the pressure-sealed valve (6.3) through the mounting hole (6.7).

4. The low-pressure, zero-leakage, impact-resistant one-way valve structure according to claim 3, characterized in that, The rocker arm (6.1) is also provided with a full-circumference reinforcing rib (6.6); the full-circumference reinforcing rib (6.6) is specifically: extending downward from the upper left side of the rocker arm (6.1) all the way to the upper left position of the mounting hole (6.7) at the lower end of the rocker arm (6.1), then circling around the mounting hole (6.7) and returning to the upper right position of the mounting hole (6.7) at the lower end of the rocker arm (6.1), and then extending upward to the upper right side of the rocker arm (6.1).

5. The low-pressure, zero-leakage, impact-resistant one-way valve structure according to claim 4, characterized in that, The structure of the valve assembly (6) and the torsion spring (7) is provided in the torsion spring arm mounting positioning hole (6.5) on the rocker arm (6.1). Specifically, the torsion spring arm mounting positioning hole (6.5) is provided on the full-circumference reinforcing rib (6.6) of the rocker arm (6.1).

6. The low-pressure, zero-leakage, impact-resistant one-way valve structure according to claim 1, characterized in that, The side wall above the opening of the inlet nozzle (4) is provided with an ear plate for installing a cylindrical pin (1). The structure of the inlet nozzle (4) and the torsion spring (7) is located next to the ear plate. The structure of the torsion spring (7) is the torsion spring torsion arm mounting positioning hole (4.1).

7. The low-pressure, zero-leakage, impact-resistant one-way valve structure according to claim 1, characterized in that, The inlet nozzle (4) has a protruding guide structure (4.2) at the opening.

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