Ellipsoidal metal diaphragm with pre-set ball socket on top

Abstract

The present invention relates to an ellipsoidal metal diaphragm with a pre-set socket on the top, which is in the field of liquid propellant extrusion-isolator devices for aircraft power systems. The diaphragm comprises a socket section, a transition section, and an ellipsoidal section. The socket section, the transition section, and the ellipsoidal section are sequentially connected to form a metal diaphragm that is cut into a semi-ellipsoidal shape along the long axis. The socket section is spherically concave and located at the top of the metal diaphragm. The profile of the ellipsoidal section is ellipsoidal. The transition section is a circular arc section that is tangentially transitioned between the socket section and the ellipsoidal section. The present invention utilizes the socket structure of the socket section with a pre-set socket section on the top, allowing the top portion that is prone to instability to serve as a guide groove. The ellipsoidal metal diaphragm is first flipped from the top, thereby achieving reliable and orderly flipping of the ellipsoidal metal diaphragm. This effectively solves the problem of premature instability of the top that cannot be solved by the traditional method of setting an R-bend angle at the equator and gradually starting to flip from the equator R-bend angle, thereby ensuring the reliability of flipping.

Description

Technical Field

[0001] The invention relates to the field of liquid propellant extrusion-isolating devices of aircraft power systems, in particular to an ellipsoidal metal diaphragm with a pre-set ball socket on the top. Background Art

[0002] As one of the important extrusion-isolation management devices of propellant tanks, metal diaphragms are widely used in various aircraft power systems due to their high reliability and simple structure. They can achieve gas-liquid isolation by themselves, and discharge the propellant through their own deformation under the action of gas pressure. Depending on the material they are made of, diaphragms can be divided into metal diaphragms and non-metallic diaphragms. Among them, metal diaphragms can meet the long-term pre-packaging needs of various aircraft systems while ensuring reliability due to their simple structure. Conventional metal diaphragms usually use an R flange set at the equator to achieve orderly flipping starting from the equator. However, for ellipsoidal metal diaphragms with a major axis Rx / minor axis Ry ratio greater than 1, due to the excessive bending moment at the top, the top is prone to premature collapse and instability during the flipping process, resulting in bidirectional wrinkles with simultaneous flipping of the equator and the top, causing the metal diaphragm to rupture during the flipping process, making it impossible to achieve orderly and reliable flipping. Therefore, it is necessary to design an ellipsoidal metal diaphragm that can achieve orderly and reliable deformation to solve the above problems.

[0003] A prior art search revealed publication number CN113247311A, which discloses a cylindrical diaphragm comprising a diaphragm cylinder, an inflation connector, and an assembly connector. The diaphragm cylinder consists of a barrel, a first end cap, and a second end cap, each seamlessly connected. The inner cavity formed by its inner surface is used to charge pressurized gas. The inflation connector is connected to the first end cap of the diaphragm cylinder at the extreme hole and communicates with the inner cavity of the diaphragm cylinder for assembly and inflation and deflation of the diaphragm. The assembly connector is connected to the second end cap of the diaphragm cylinder at the extreme hole for assembly of the diaphragm. This patented technology suffers from the aforementioned corresponding problems. Summary of the Invention

[0004] In view of the defects in the prior art, the object of the present invention is to provide an ellipsoidal metal diaphragm with a pre-set ball socket on the top.

[0005] According to the present invention, an ellipsoidal metal diaphragm with a pre-set ball socket on the top comprises a ball socket section, a transition section and an ellipsoidal section;

[0006] The ball and socket section, the transition section and the ellipsoid section are connected in sequence to form a metal diaphragm that is cut into a semi-ellipsoidal shape along the long axis direction. The ball and socket section is spherically concave and is located on the top of the metal diaphragm. The profile of the ellipsoid section is ellipsoidal, and the transition section is a circular arc section that is tangentially transitioned between the ball and socket section and the ellipsoid section.

[0007] In some embodiments, the ball and socket segment has a basic wall thickness, and the wall thickness from the connecting edge of the ball and socket segment and the transition segment to the opening edge of the ellipsoid segment gradually increases while maintaining a smooth transition.

[0008] In some embodiments, the cumulative increase in wall thickness from the connecting edge of the ball and socket segment and the transition segment to the opening edge of the ellipsoid segment is 0.5 to 3 mm.

[0009] In some embodiments, the wall thickness of the ball and socket segment is 0.5-2 mm, the radius of the ball and socket segment is 20-50 mm, and the depth h of the concave apex of the ball and socket segment relative to the ellipsoid segment is 5-30 mm.

[0010] In some embodiments, the major semi-axis R of the ellipsoid segment X With the minor axis R Y The ratio is 1 to 3.

[0011] In some embodiments, the radius of the transition section is 100-200 mm.

[0012] In some embodiments, ribs are further included, wherein the ribs are annular protrusions arranged at intervals in the latitudinal direction along the outer peripheral surface of the metal diaphragm.

[0013] In some embodiments, the rib is an annular bar with a rectangular cross-section.

[0014] In some embodiments, the protruding height H of the rib is 0.5-1.5 mm, the width t1 is 1-2 mm, and the chamfers r1 on both sides of the rib in contact with the surface of the metal diaphragm are 0.1-0.3 mm.

[0015] In some embodiments, the number of the ribs disposed on the outer peripheral surface of the metal diaphragm is 3 to 10.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention utilizes the ball-and-socket structure of the pre-set ball-and-socket section at the top, allowing the top portion that is prone to instability to serve as a guide groove. The ellipsoidal metal diaphragm is first flipped from the top, thereby achieving reliable and orderly flipping of the ellipsoidal metal diaphragm. This effectively solves the problem of premature instability of the top that cannot be solved by the traditional method of setting an R-bend angle at the equator and gradually flipping from the equator R-bend angle, thereby ensuring the reliability of flipping.

[0018] 2. The present invention breaks the structural limitation of the transmission metal diaphragm, which is that it is difficult to realize an ellipsoidal metal diaphragm with a semi-long-short axis ratio greater than 1, and meets the demand for compact axial installation space of the aircraft propellant metal diaphragm tank.

[0019] 3. The present invention provides annular ribs on the metal diaphragm, so that the center of mass of the ellipsoidal metal diaphragm is stable and does not shift during the discharge process, there is no lateral instability during the flipping process, and there is no liquid shaking, which is beneficial to the attitude control of the aircraft.

[0020] 4. The ellipsoidal metal diaphragm of the present invention can ensure long-term storage of storable liquids and long-term contact with high-temperature gases, which is beneficial to the pre-packaging of propellants in missile weapon power systems and the application of high-temperature gas boosting systems.

[0021] 5. The ellipsoidal metal diaphragm with a pre-set ball socket on the top of the present invention has a stable pressure difference during the flipping process, which is conducive to the efficient discharge of liquid in the tank; BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0023] Figure 1 A three-dimensional diagram of the ellipsoidal metal diaphragm with a pre-set ball socket on the top provided by the present invention;

[0024] Figure 2 A two-dimensional cross-sectional view of an ellipsoidal metal diaphragm with a pre-set ball socket on the top provided by the present invention;

[0025] Figure 3 This is a partial enlarged view of the ribs of the ellipsoidal metal diaphragm with a pre-set ball socket on the top provided by the present invention. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0027] Example 1

[0028] This embodiment provides an ellipsoidal metal diaphragm with a pre-set ball socket on the top, such as Figure 1-3 As shown, it includes a ball and socket segment 1, a transition segment 2 and an ellipsoid segment 3. The ball and socket segment 1, the transition segment 2 and the ellipsoid segment 3 are sequentially connected to form a metal diaphragm that is cut into a semi-ellipsoidal shape along the long axis direction. The ball and socket segment 1 is located at the top of the metal diaphragm. The ball and socket segment 1 is spherically concave, and the concave top of the spherically concave ball and socket segment 1 is located in the inner cavity of the metal diaphragm. The radius of the ball and socket segment 1 is 20 to 50 mm, and its depth h is 5 to 30 mm. The so-called depth h of the ball and socket segment 1 refers to the distance between the concave top of the ball and socket segment 1 and the top of the extension line of the profile of the ellipsoid segment 3, as shown Figure 2As shown. Transition section 2 is a circular arc segment sandwiched between ball-and-socket section 1 and ellipsoidal section 3, forming a tangential transition. The radius of transition section 2 is 100 to 200 mm. The profile of ellipsoidal section 3 is ellipsoidal. One end of ellipsoidal section 3 is tangentially connected to transition section 2, and the other end is an opening. Ball-and-socket section 1, transition section 2, and ellipsoidal section 3 are integrally formed into a metal diaphragm. The opening of ellipsoidal section 3 can be connected to external components using hot melt welding methods such as electron beam welding, argon arc welding, and laser welding.

[0029] In this embodiment, the ball-and-socket structure of the pre-set ball-and-socket section at the top is utilized to allow the top portion, which is prone to instability, to serve as a guide groove. The ellipsoidal metal diaphragm is first flipped from the top, thereby achieving reliable and orderly flipping of the ellipsoidal metal diaphragm. This effectively solves the problem of premature instability of the top that cannot be solved by the traditional method of setting an R-bend angle at the equator and gradually flipping from the equator R-bend angle, thereby ensuring the reliability of the flipping.

[0030] In some embodiments, the ball and socket segment 1 serves as the basic wall thickness, and the wall thickness gradually increases and smoothly transitions from the transition connection between the ball and socket segment 1 and the transition segment 2 to the opening edge of the ellipsoid segment 3. The ball and socket segment 1 serving as the basic wall thickness means that the wall thickness in this segment is set to a uniform wall thickness and is the thinnest. In some embodiments, the wall thickness t of the ball and socket segment 1 is 0.5 to 2 mm, and the cumulative thickening from the transition connection between the ball and socket segment 1 and the transition segment 2 to the opening edge of the ellipsoid segment 3 is 0.5 to 3 mm. The so-called cumulative thickening refers to the difference between the wall thickness at the transition connection between the ball and socket segment 1 and the transition segment 2 and the wall thickness at the opening edge of the ellipsoid segment 3. The ball and socket segment serves as the basic wall thickness, and the wall thickness after the ball and socket segment begins to gradually thicken, which can not only further improve the guiding effect, but also ensure the reliability of flipping.

[0031] In some embodiments, the semi-major axis R of the ellipsoid segment 3 X With the minor axis R Y The ratio is 1-3. Based on the structure of the pre-installed ball socket on the top of the ellipsoidal metal diaphragm, the ratio of the major and minor axes of the ellipsoidal segment 3 can be greater than 1. This overcomes the structural limitation of the ellipsoidal metal diaphragm that it is difficult to achieve a major and minor axis ratio greater than 1 for the transmission metal diaphragm, and meets the requirement of compact axial installation space for the metal diaphragm tank of the aircraft propellant.

[0032] Example 2

[0033] This embodiment 2 is formed on the basis of embodiment 1. By providing annular ribs on the metal diaphragm, the center of mass of the ellipsoidal metal diaphragm is kept stable and does not shift during the discharge process, and there is no lateral instability or liquid sloshing during the flipping process, which is beneficial to the attitude control of the aircraft. Specifically:

[0034] like Figure 1-3As shown, annular raised ribs 4 are formed on the surface of the metal diaphragm. The number of ribs 4 is 3 to 10. A plurality of ribs 4 are arranged at intervals along different dimensions of the outer peripheral surface of the metal diaphragm. The ribs 4 are mainly distributed on the outer peripheral surface of the ellipsoidal segment 3 and the transition segment 2. In some embodiments, the cross-sectional shape of the rib 4 is rectangular. The raised height H of the rib 4 with a rectangular cross-section is 0.5 to 1.5 mm, and the width t1 is 1 to 2 mm. The chamfer r1 at the connection between the two side surfaces of the rib 4 with a rectangular cross-section and the outer peripheral surface of the metal diaphragm is 0.1 to 0.3 mm. By optimizing the cross-sectional shape of the rib 4 and the corresponding parameters, the stability of the metal diaphragm flipping process is further improved.

[0035] Compared with the conventional equatorial preset R-flange form used in the prior art, the top of the diaphragm is prone to premature instability during the flipping process, thus failing to flip in an orderly manner. The present invention not only solves the problem of the ellipsoidal metal diaphragm with an excessively large ratio of the major and minor axes, but also has the advantages of small axial size, high reliability, small displacement of the emission center of mass, and no lateral instability during the flipping process.

[0036] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0037] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. The embodiments of this application and the features in the embodiments may be combined with each other in any manner unless there is a conflict.

Claims

1. An ellipsoidal metal diaphragm with a pre-set ball socket on the top, characterized in that: It comprises a ball-and-socket section (1), a transition section (2) and an ellipsoid section (3); The ball-and-socket section (1), the transition section (2), and the ellipsoid section (3) are sequentially connected to form a metal diaphragm that is cut into a semi-ellipsoidal shape along the long axis direction; the ball-and-socket section (1) is spherically concave and located on the top of the metal diaphragm; the profile of the ellipsoid section (3) is an ellipsoid; and the transition section (2) is a circular arc section that is a tangential transition between the ball-and-socket section (1) and the ellipsoid section (3); The ball and socket section (1) has a basic wall thickness, and the wall thickness gradually increases from the connecting edge of the ball and socket section (1) and the transition section (2) to the opening edge of the ellipsoid section (3) while maintaining a smooth transition; It also includes ribs (4), which are annular protrusions arranged at intervals in the latitudinal direction along the outer peripheral surface of the metal diaphragm; The number of the ribs (4) arranged on the outer peripheral surface of the metal diaphragm is 3 to 10.

2. The ellipsoidal metal diaphragm with a pre-set ball socket on the top according to claim 1, characterized in that: The cumulative increase in wall thickness from the connecting edge of the ball and socket section (1) and the transition section (2) to the opening edge of the ellipsoid section (3) is 0.5 to 3 mm.

3. The ellipsoidal metal diaphragm with a pre-set ball socket on the top according to claim 1, characterized in that: The wall thickness of the ball and socket segment (1) is 0.5 to 2 mm, the radius of the ball and socket segment (1) is 20 to 50 mm, and the depth h of the concave vertex of the ball and socket segment (1) relative to the ellipsoid segment (3) is 5 to 30 mm.

4. The ellipsoidal metal diaphragm with a pre-set ball socket on the top according to claim 1, characterized in that: The major semi-axis R of the ellipsoid segment (3) X With the minor axis R Y The ratio is 1 to 3.

5. The ellipsoidal metal diaphragm with a pre-set ball socket on the top according to claim 1, characterized in that: The radius of the transition section (2) is 100-200 mm.

6. The ellipsoidal metal diaphragm with a pre-set ball socket on the top according to claim 1, characterized in that: The rib (4) is an annular bar with a rectangular cross section.

7. The ellipsoidal metal diaphragm with a pre-set ball socket on the top according to claim 1, characterized in that: The rib (4) has a protruding height H of 0.5 to 1.5 mm and a width t1 of 1 to 2 mm. The chamfers r1 on both sides of the rib (4) in contact with the metal diaphragm surface are 0.1 to 0.3 mm.

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