An extrusion pin connection assembly and liquid oxygen butterfly valve

Abstract

An extruded pin connection assembly consists of a pin body, a valve stem, a valve plate, a fixing pin, and a fastening screw. The valve stem is a cylindrical shaft with a U-shaped groove. The valve plate is disc-shaped with a boss on its back, which contains a circular hole. The valve stem shaft fits into the circular hole of the valve plate. The pin body is a combination of a wedge-shaped key and a rectangular platform. The bottom surface of the pin body fits tightly against the back of the valve plate. The wedge-shaped key fits tightly into the U-shaped groove of the valve stem. The rectangular platform is provided with a pin hole and a screw hole, and is fastened to the valve plate via a fixing pin and a fastening screw. The connection structure of the present invention is safe and reliable in stress-bearing state, can be used for a long time, and can also meet requirements under low-temperature conditions.

Description

Technical Field

[0001] The invention relates to an extrusion pin-type connection assembly and a liquid oxygen butterfly valve, belonging to the technical fields of aerospace and liquid rocket engines, and is used in a liquid oxygen butterfly valve of an oxidizer supply system of a liquid rocket engine. Background Art

[0002] Over the past half century, with the continuous development of the space industry, humanity has made tremendous achievements in conquering space and developing and utilizing space resources. This is largely due to the continuous advancement of rocket propulsion technology. Major space powers around the world have developed a number of advanced liquid rocket engines, which are used to power various launch vehicles. These engines have enabled the launch of artificial satellites, manned spaceflight, lunar landings, Mars exploration, global satellite communications and television broadcasting, and even the establishment of the global Internet. These achievements have greatly promoted the development of human civilization and achieved immeasurable economic and social benefits.

[0003] Liquid rockets generally consist of a fairing, instrument compartment, interstage, oxidizer and fuel tanks, a pressurization and delivery system, an engine, and a tail stage. Liquid rocket engines primarily consist of a thrust chamber, a turbopump, a gas generator, and various valves and pipelines. Today's liquid rocket engines utilize an increasing number of valve types. With the application of butterfly valves in cryogenic oxidizer delivery systems, it has been discovered that the connecting components of butterfly valves are subject to severe stress and are prone to damage. Furthermore, under low-temperature operating conditions, the materials of the opening and closing parts shrink and deform, causing the round pins to loosen and fall off easily, leading to connection failure and rendering the butterfly valve inoperable. Therefore, the aerospace industry urgently needs to find an effective technical solution to the problems of low wear and tear on the opening and closing parts of liquid oxygen butterfly valves, as well as their tendency to loosen and fall off. Summary of the Invention

[0004] The technical problem solved by the present invention is to solve the technical problem that the connection components of the butterfly valve are subjected to poor stress conditions, which easily lead to damage, and the material shrinkage deformation caused by low temperature working conditions, which leads to connection failure. This application proposes a new connection method, changes the pin-type connection form of the valve stem and valve plate of the original butterfly valve opening and closing parts, improves the stress state of the pin body during the force transmission process, and overcomes the technical problem that the connection components of the butterfly valve are subjected to poor stress conditions, which easily lead to damage and make the butterfly valve unable to operate.

[0005] The technical solution of the present invention is:

[0006] The present application provides an extruded pin-type connection assembly for use in a liquid oxygen butterfly valve in a liquid rocket engine power oxidizer supply system. The extruded pin-type connection assembly comprises a pin body 1, a valve stem 2, a valve plate 3, a fixing pin 4, and a fastening screw 5. The valve stem 2 is a cylindrical shaft with a U-shaped groove formed thereon. The valve plate 3 is disc-shaped and has a boss formed on the back side of the valve plate 3. The boss has a circular hole formed therein. The shaft of the valve stem 2 is assembled into the circular hole of the valve plate 3.

[0007] Preferably, the pin body includes a wedge-shaped key and a rectangular platform, and the wedge-shaped key and the rectangular platform are an integrated structure;

[0008] Preferably, the bottom surface of the pin body 1 is tightly fitted with the back surface of the valve plate 3, and the wedge-shaped key portion is tightly assembled in the U-shaped groove of the valve stem 2;

[0009] Optionally, a pin hole and a screw hole are provided on the rectangular platform, wherein the pin hole is used to accommodate a fixing pin, and the screw hole is used to accommodate a fastening screw; and the rectangular platform is fastened to the valve plate 3 by the fixing pin and the fastening screw;

[0010] Optionally, the diameter of the pin hole is smaller than the diameter of the screw hole;

[0011] Optionally, the diameter of the valve plate 3 is D, the diameter of the valve stem 2 is d, the length is L, the length of the rectangular platform is A, the cross section of the rectangular platform is a square, the side length of the square is B, the contact area between the wedge key and the valve stem 2 is S, the elastic modulus of the material of the valve stem 2 is E1, the Poisson's ratio is V1, the elastic modulus of the material of the wedge key (11) is E2, the Poisson's ratio is V2, the wedge angle of the wedge key is θ, and θ satisfies the following conditions: ;

[0012] The present application also provides a liquid oxygen butterfly valve, comprising a drive device and a connection assembly, wherein the connection assembly is an extrusion pin-type connection assembly;

[0013] An optional drive device is connected to the connecting assembly and drives the valve stem of the connecting assembly to rotate 90 degrees. The valve stem converts the rotational force into an extrusion force through the pin body and transmits it to the valve plate, causing the valve plate to rotate 90 degrees.

[0014] The extrusion pin connection described in the present invention has the following working process: the butterfly valve drive device is connected to the valve stem head and drives the valve stem to rotate 90 degrees. The valve stem transmits the rotational force to the valve plate through the pin body, so that the outer circular surface of the valve plate is in close contact with or disengaged from the inner surface of the butterfly valve sealing ring, thereby realizing medium sealing or circulation and achieving the purpose of opening and closing the valve.

[0015] The advantages of the present invention over the prior art are: the present invention applies an extrusion pin connection to a butterfly valve in a liquid rocket engine oxidizer supply system, changing the original round pin connection to an extrusion pin connection, so that the pin body changes from completely bearing shear stress to completely bearing extrusion force during the force transmission process, thereby improving the stress state of the pin body; and overcoming the problem of material shrinkage deformation caused by low temperature working conditions, which leads to connection failure and makes the butterfly valve unable to work. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a front view of the structure of the extruded pin-type connection assembly of this application when the valve plate is closed;

[0017] Figure 2 This is a front view of the structure of the extruded pin-type connection assembly of this application when the valve plate is open;

[0018] Figure 3 This is a top-down cross-sectional view of the structure of the extruded pin-type connection assembly of this application when the valve plate is open;

[0019] Figure 4 This is a cross-sectional view of the pin body of the extruded pin connection assembly of this application;

[0020] Figure 5 This is a top view of the pin body of the extruded pin connection assembly of this application;

[0021] Figure 6 This is a front view of the valve stem of the extruded pin-type connection assembly of this application;

[0022] Figure 7 A cross-sectional view of the valve stem of the extruded pin-type connection assembly for this application;

[0023] Figure 8 This is a front cross-sectional view of the valve plate of the extruded pin-type connection assembly of this application;

[0024] Figure 9 This is a top cross-sectional view of the valve plate of the extruded pin-type connection assembly of this application;

[0025] Figure 10 This is a left side view of the valve plate of the extruded pin-type connection assembly of this application;

[0026] Figure 11 This is a partial structural diagram of the pin body installation of the extruded pin connection assembly of this application;

[0027] Figure 12 It is a cross-sectional view of a round pin type connection assembly in the prior art; Description of the drawings:

[0029] 1-pin body, 2-valve stem, 3-valve plate, 4-fixing pin, 5-fastening screw, 6-sealing ring, 7-actuator. DETAILED DESCRIPTION

[0030] The specific embodiments of the present invention are described below with reference to the accompanying drawings;

[0031] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are merely for the purpose of facilitating the description of the present invention and simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed or operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0032] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more;

[0033] In the description of this application, it should be noted that, unless otherwise specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0034] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples;

[0035] In the field of aerospace, the research and development of liquid rocket engines and related technologies has always been one of the focuses of the industry. With the increasing number of valve types used in liquid rocket engines, especially with the introduction and application of existing butterfly valves in liquid rocket engines, the technical problems of large wear and tear of the opening and closing parts of liquid oxygen butterfly valves (hereinafter referred to as "butterfly valves") and easy loosening and falling off have been exposed. Figure 12 As shown;

[0036] In order to solve this technical problem, the inventors of the present invention conducted intensive research and found that the defects and deficiencies in the prior art are mainly due to the fact that the connection between the valve stem and the valve plate of the existing butterfly valve opening and closing parts is greatly limited. The inventors of the present invention further found that the existing butterfly valve opening and closing parts are connected in a round pin straight-insertion manner. This connection method, on the one hand, means that when the valve stem transmits power to the valve plate, the transmission force is completely converted into the shear stress borne by the round pin, resulting in a poor stress condition for the round pin. On the other hand, under low-temperature working conditions, the opening and closing parts material will shrink and deform, causing the round pin to easily loosen and fall off, thereby causing the connection to fail and the butterfly valve to stop working.

[0037] Based on the above findings and combined with years of practical work experience, the inventors of the present invention have creatively proposed a new connection method and designed an extruded pin-type connection assembly. The present invention will be described in detail below with reference to the accompanying drawings.

[0038] Figure 1 、 Figure 2 They are the front views of the structure when the extrusion pin-type connection valve plate is closed and open. Figure 3 This is a top cross-sectional view of the structure of the extrusion pin-type connection valve plate of the present invention when it is open;

[0039] Liquid rocket engines include thrust chambers, turbopumps, gas generators, various valves (such as butterfly valves), and various pipelines. Among them, valves are used to achieve fluid control. The butterfly valve of the present application includes at least a drive device and a connecting assembly. The connecting assembly specifically adopts an extrusion pin-type connection method and is used in liquid oxygen butterfly valves in liquid rocket engine power oxidizer supply systems. In actual use, the butterfly valve drive device is connected to the valve stem head and drives the valve stem to rotate 90°. The valve stem completely converts the rotational force into extrusion force through the pin body and transmits it to the valve plate, causing the valve plate to rotate 90°. Before the valve plate rotates, its outer cylindrical sealing surface is in close contact with the inner surface of the butterfly valve sealing ring, cutting off the medium in front and behind the valve plate; after the valve plate rotates, its outer cylindrical sealing surface is separated from the inner surface of the butterfly valve sealing surface, connecting the medium in front and behind the valve plate, thereby achieving the purpose of opening and closing the butterfly valve. Figure 4 This is a cross-sectional view of the pin body of the extruded pin connection in this application. Figure 5 This is a top view of the extruded pin-type connection pin body of this application;

[0040] like Figure 1-5As shown, the extruded pin connection assembly provided by the present application includes a pin body 1, a valve stem 2, a valve plate 3, a fixing pin 4 and a fastening screw 5. The valve stem 2 is a cylindrical shaft with a U-shaped groove. The valve plate 3 is disc-shaped with a boss on the back thereof, a circular hole in the boss, and the shaft of the valve stem 2 is assembled in the circular hole of the valve plate 3. The pin body 1 is a combination of a wedge-shaped key and a rectangular platform. The bottom surface of the pin body 1 fits tightly against the back of the valve plate 3. The wedge-shaped key portion is tightly assembled in the U-shaped groove of the valve stem 2. The rectangular platform portion is provided with a pin hole and a screw hole, and is fastened to the valve plate 3 by a fixing pin and a fastening screw.

[0041] Combine Figure 4 、 Figure 5 As shown, the pin body 1 is a combination of a wedge-shaped key and a rectangular platform 12. It can be understood that the pin body includes the wedge-shaped key and the rectangular platform, and the wedge-shaped key and the rectangular platform are an integrated component. The rectangular platform is provided with large and small holes. Figure 4 、 Figure 5 The corresponding small hole is the pin hole, and the large hole is the screw hole. The diameter of the valve plate 3 is D, the diameter of the valve stem 2 is d, and the length is L. The length of the rectangular platform is A, the cross-section of the rectangular platform is a square, and the side length of the square is B. The contact area between the wedge key and the valve stem 2 is S. The elastic modulus of the valve stem 2 material is E1, and the Poisson's ratio is V1. The elastic modulus of the wedge key material is E2, and the Poisson's ratio is V2. The wedge angle of the wedge key is θ, and θ satisfies the following conditions: ;

[0042] Figure 6 、 Figure 7 They are respectively a front view and a cross-sectional view of the extruded pin-type connection valve stem of the present application. Figure 6 、 Figure 7 The outer contour of the valve stem 2 can be clearly expressed in the figure, that is, the valve stem 2 is a cylindrical shaft body with a U-shaped groove on the shaft body. Figure 6 A U-shaped groove is formed on the shaft at the lower middle portion of the middle valve stem 2;

[0043] Figure 8 、 Figure 9 、 Figure 10 The valve plate in the extruded pin connection assembly of this application is introduced from different perspectives;

[0044] Figure 11 This is a partial structural diagram of the installation of the extruded pin type connection pin body of this application. Figure 11 As can be seen, a circular hole is provided on the disc-shaped valve plate 3. It should be noted that the valve plate 3 can be disc-shaped or can be designed as a plate surface with other arcs as needed. A boss is provided on the back of the valve plate 3. A circular hole is opened on the boss;

[0045] The pin body 1 is composed of a wedge-shaped key and a rectangular platform, which are integral components. The valve stem 2 is assembled into a circular hole in the valve plate 3. The pin body 1 is a combination of a wedge-shaped key and a rectangular platform. The bottom surface of the pin body 1 fits tightly against the back of the valve plate 3. The wedge-shaped key fits tightly into the U-shaped groove of the valve stem 2. The rectangular platform is provided with a pin hole and a screw hole and is fastened to the valve plate 3 by a fixing pin and a fastening screw.

[0046] The present application also provides a liquid oxygen butterfly valve, which at least includes a drive device and a connection assembly. The butterfly valve adopts an extrusion pin connection assembly. The drive device in the liquid oxygen butterfly valve of the present application is connected to the head of the valve stem 2, and drives the valve stem 3 to perform a 90° rotational movement. The valve stem 2 transmits the rotational force to the valve plate 3 through the pin body 1, so that the outer circular surface of the valve plate 3 is in close contact with or disengaged from the inner surface of the butterfly valve sealing ring, thereby realizing medium sealing or circulation, and achieving the purpose of opening and closing the valve. The present invention creatively designs an extrusion pin connection assembly and applies it to the butterfly valve of the liquid rocket engine oxidizer supply system, changing the original round pin connection to an extrusion pin connection, so that the pin body changes from completely bearing shear stress to completely bearing extrusion force during the force transmission process, and the force properties undergo a qualitative change, thereby improving the force state of the pin body. Furthermore, the extruded pin assembly of the present application is made of a material having a certain elastic modulus. In addition, when the butterfly valve is closed, the outer surface of the valve plate 3 is in close contact with the inner surface of the butterfly valve sealing ring, thereby overcoming the problem of cold shrinkage and deformation of the material caused by low temperature working conditions, which leads to connection failure and makes the butterfly valve unable to work.

[0047] Practice has proven that the extruded pin connection assembly used in the application improves the stress state of the pin body, ensures the safe and reliable opening and closing of the butterfly valve under low-temperature conditions, and ensures the working stability of the liquid rocket engine;

[0048] The above description is only a specific embodiment of the present invention, but the protection of the present invention is not limited thereto. Any non-substantial improvement made by those skilled in the art without changing the principle and applied to the technical field of liquid rocket engine propellant gas generators shall also be considered within the scope of protection of the present invention.

[0049] The contents not described in detail in the specification of the present invention belong to the prior art known to those skilled in the art.

Claims

1. An extruded pin connection assembly for use in a liquid oxygen butterfly valve in a liquid rocket engine power oxidizer supply system, characterized in that: The extrusion pin connection assembly comprises a pin body (1), a valve stem (2), a valve plate (3), a fixing pin (4) and a fastening screw (5); the valve stem (2) is a cylindrical shaft body, and a U-shaped groove is provided on the shaft body; the valve plate (3) is disc-shaped, and a boss is provided on the back of the valve plate (3), and a circular hole is provided in the boss, and the shaft body of the valve stem (2) is assembled in the circular hole of the valve plate (3); The pin body (1) comprises a wedge-shaped key and a rectangular platform, and the wedge-shaped key and the rectangular platform are an integrated structure; The rectangular platform is provided with a pin hole and a screw hole, wherein the pin hole is used to accommodate a fixing pin, and the screw hole is used to accommodate a fastening screw; and the rectangular platform is fastened to the valve plate (3) by the fixing pin and the fastening screw; The bottom surface of the pin body (1) is tightly fitted with the back surface of the valve plate (3), and the wedge-shaped key portion is tightly assembled in the U-shaped groove on the valve stem (2).

2. The extruded pin connection assembly according to claim 1, wherein: The diameter of the pin hole is smaller than the diameter of the screw hole.

3. The extruded pin connection assembly according to claim 1, characterized in that: The diameter of the valve plate (3) is D, the diameter of the valve stem (2) is d, the length is L, the length of the rectangular platform is A, the cross section of the rectangular platform is a square, the side length of the square is B, the contact area between the wedge key and the valve stem (2) is S, the elastic modulus of the valve stem (2) material is E1, the Poisson's ratio is V1, the elastic modulus of the wedge key material is E2, the Poisson's ratio is V2, the wedge angle of the wedge key is θ, and θ satisfies the following conditions:

4. A liquid oxygen butterfly valve, comprising a drive device and a connecting assembly, characterized in that: The connection assembly is an extruded pin-type connection assembly according to any one of claims 1 to 3.

5. The liquid oxygen butterfly valve according to claim 4, characterized in that: The driving device is connected to the connecting assembly and drives the valve stem of the connecting assembly to perform a 90° rotational movement. The valve stem converts the rotational force into an extrusion force through the pin body and transmits it to the valve plate, causing the valve plate to rotate 90°.

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