Space electric valve with built-in ball screw

Abstract

The utility model provides a kind of built-in ball screw's aerospace electric valve, including valve body, the end cap of being set to the upper end of valve body, the ball screw drive mechanism of being arranged in valve body, the valve core assembly being connected with ball screw drive mechanism and being located in the valve cavity of valve body, bottom sealing structure being set to the lower part of valve cavity and top sealing structure being set to the upper part of valve cavity;Valve body is equipped with inlet, outlet and circulation precooling mouth;Valve sleeve is provided in valve cavity, and valve core assembly is arranged in valve sleeve;Ball screw drive mechanism is arranged in valve body and is used to be connected with driving motor transmission connection.The utility model discloses a kind of built-in ball screw's aerospace electric valve, solve the problem that the traditional main road valve in relevant technology realizes switch function and needs at least to rely on gas cylinder, pressure reducing valve and solenoid valve three kinds of valves and through complex pipeline connection collaborative work, leading to engine pipeline system connection complex, and then its overall reliability is significantly reduced under the mechanical environment.

Description

Technical Field

[0001] This utility model belongs to the field of aerospace technology, and in particular relates to an aerospace electric valve with a built-in ball screw. Background Technology

[0002] Currently, liquid rocket engine mainline valves generally employ pneumatic control. Their working principle is as follows: control gas in a high-pressure cylinder is first reduced to a predetermined pressure by a pressure-reducing valve, and then, controlled by a solenoid valve, is delivered to the control chamber of the mainline valve, thereby driving the valve to open and close. Because traditional mainline valves in related technologies require at least three valves—a gas cylinder, a pressure-reducing valve, and a solenoid valve—to function in coordination through complex piping connections, the engine piping system becomes complex, with numerous valve types, leading to a significant reduction in overall reliability under mechanical conditions. Utility Model Content

[0003] In view of this, the present invention aims to at least partially solve one of the related technical problems.

[0004] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0005] An aerospace electric valve with a built-in ball screw includes a valve body, an end cap disposed at the upper end of the valve body, a ball screw transmission mechanism disposed in the valve body, a valve core assembly connected to the ball screw transmission mechanism and located in the valve cavity of the valve body, a bottom sealing structure disposed at the lower part of the valve cavity, and a top sealing structure disposed at the upper part of the valve cavity.

[0006] The valve body is provided with an inlet, an outlet, and a circulating precooling port;

[0007] A valve sleeve is provided inside the valve cavity, and the valve core assembly is disposed inside the valve sleeve;

[0008] The ball screw transmission mechanism is arranged in the valve body and is used for transmission connection with the drive motor.

[0009] The valve core assembly is fixedly connected to the ball screw transmission mechanism and is movable relative to the valve body along the axial direction of the valve cavity;

[0010] The bottom sealing structure is located at the lower part of the valve cavity, opposite to the inlet;

[0011] The top sealing structure is located at the upper part of the valve cavity, opposite to the circulating precooling port;

[0012] The outer circle of the valve sleeve and the inner wall of the valve body form a circumferential annular cavity in the axial direction between the inlet and the bottom sealing structure;

[0013] The valve body sidewall is provided with a lateral through hole that communicates with the circumferential annular cavity;

[0014] The lateral through hole is connected to the circulating precooling port;

[0015] The valve core assembly moves between a first position and a second position under the drive of the ball screw transmission mechanism, wherein:

[0016] In the first position, the valve core assembly abuts against the bottom sealing structure;

[0017] In the second position, the valve core assembly abuts against the top sealing structure.

[0018] Furthermore, the ball screw transmission mechanism includes a ball screw and a nut that cooperates with it, and the nut is fixedly connected to the valve core assembly.

[0019] Furthermore, the valve core assembly is a split structure, comprising an upper valve core and a lower valve core that are threaded together.

[0020] Furthermore, a plurality of first sealing rings are provided on the outer periphery of the threaded connection between the upper valve core and the lower valve core.

[0021] Furthermore, a guide support is provided inside the valve cavity, which cooperates with the valve core assembly to restrict the rotation of the valve core assembly relative to the valve body and guide it axially.

[0022] Furthermore, the inlet is located at the bottom of the valve body, the outlet is located in the middle section of the side of the valve body and is perpendicular to the inlet axis, and the circulating precooling port is located on the upper right side wall of the valve body.

[0023] Furthermore, a blowout port is provided on the side wall of the valve body, and the blowout port is located in the middle of the valve cavity and is disposed opposite to the middle section of the valve core assembly.

[0024] Furthermore, the end cap and the valve body are detachably connected by screws, and a second sealing ring is installed between the end cap and the valve body to isolate the internal medium of the valve body from flowing to the outside.

[0025] Compared with existing technologies, the aerospace electric valve with a built-in ball screw described in this utility model has the following advantages:

[0026] 1. This solution arranges transmission and actuation components simultaneously within the space enclosed by the valve body and end cap, and uses the axial contact of the valve core assembly between two sealing structures to switch between the main circuit and the pre-cooling branch circuit. This allows the switching to be achieved within a single valve, eliminating the need for multiple external valves and complex pipelines. Structurally, this significantly reduces the number of connection points and interfaces, thereby reducing potential leakage points and simplifying the assembly and leak detection process. Meanwhile, since the pre-cooling flow is directly led out through the circumferential annular cavity and its lateral through holes formed inside the valve body, it avoids the need for additional external flow intake pipelines to occupy the envelope space. This allows for compact arrangement and support within a narrow compartment. The detachable connection between the end cap and the valve body ensures sealing performance while improving maintenance convenience and the operability of replacing seals on-site. Overall, this solution demonstrates higher system integration and engineering adaptability.

[0027] 2. This solution features a dedicated sealing ring on the outer periphery of the split threaded connection of the valve core assembly to block any potential bypasses. A circumferential annular cavity established between the valve sleeve and valve body at the inlet and lower sealing positions stably confines the pre-cooled flow to the upstream region of the valve seat, preventing disordered fluid flow near the valve core from affecting the seal. Combined with a guide structure within the valve cavity, the valve core assembly achieves axial sliding fit and anti-rotation constraint, maintaining uniform sealing line load and positional consistency during reciprocating opening and closing. This helps reduce sealing surface wear under conditions of low temperature, vibration, and thermal shrinkage, improving seal life and positioning repeatability. Simultaneously, the static seal between the end cap and valve body forms a reliable barrier to the outside environment, allowing for residual removal and purging of the middle cavity or outlet side without disassembling the main seal, further enhancing sealing reliability and maintenance efficiency throughout the entire lifespan. Attached Figure Description

[0028] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0029] Figure 1 This is a schematic diagram of the closed state of an aerospace electric valve with a built-in ball screw, as described in an embodiment of this utility model.

[0030] Figure 2 This is a schematic diagram of the open state of an aerospace electric valve with a built-in ball screw, as described in an embodiment of this utility model.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Top sealing structure; 2. Circulation precooling port; 3. Third sealing ring; 4. Blowout port; 5. Upper valve core; 6. Lower valve core; 7. Bottom sealing structure; 8. First sealing ring; 9. Deep groove ball bearing; 10. Ball screw drive mechanism; 11. Fourth sealing ring; 12. Second sealing ring. Detailed Implementation

[0033] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0034] 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 orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0035] 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 integral connection; they can refer to a mechanical connection or an electrical 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.

[0036] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0037] Referring to the background art regarding the need for high-pressure air sources, pressure reducing / stabilizing valves, solenoid valves, and multi-stage control pipelines to work together in the operation of pneumatic main circuit valves, this embodiment proposes an aerospace electric valve with a built-in ball screw for propellant main circuit control. Its overall structure consists of a valve body and an end cap forming a valve cavity. A ball screw transmission mechanism 10 and an axially movable valve core assembly are arranged within this valve cavity. A bottom sealing structure 7 is provided at the lower part of the valve cavity, and a top sealing structure 1 is provided at the upper part. Through the axial displacement of the valve core assembly relative to the valve body and the contact relationship between the two sealing structures, switching sealing between the main circuit and the pre-cooling branch circuit is achieved within the same valve. The valve body is provided with an inlet for connection to the main propellant pipe and an outlet for connection to the engine fluid supply pipeline. A circulation pre-cooling pipeline is also provided on the upper right side wall of the valve body. Cold port 2, a purge port 4 can be set in the middle of the valve body side wall for maintenance purging or residual liquid drainage. The upper end of the valve body is detachably connected to the end cap with screws, and a second sealing ring 12 is installed between the end cap and the valve body. The second sealing ring 12 is located in the sealing groove where the two meet to isolate the leakage path of the medium in the valve body cavity to the outside. In order to form a pre-cooling flow intake structure, a valve sleeve is set in the valve cavity. The valve sleeve and the valve body are sealed by a third sealing ring 3. The valve core assembly is set in the inner hole of the valve sleeve. The outer circle of the valve sleeve and the inner wall of the valve body form a circumferential annular cavity in the axial direction between the inlet and the bottom sealing structure 7. A lateral through hole is opened on the side wall of the valve body to communicate with the circumferential annular cavity. The lateral through hole communicates with the circulating pre-cooling port 2. Thus, the lateral flow intake and outlet of the pre-cooling branch is completed inside the valve body without the need for external additional pipelines.

[0038] The ball screw drive mechanism 10 is arranged inside the valve body and is used for transmission connection with the output shaft of the external drive motor. The ball screw drive mechanism 10 includes a ball screw and a nut that mates with it. The nut is fixedly connected to the valve core assembly and is preferably detachably assembled by screws to facilitate quick separation during maintenance and replacement of seals. The valve core assembly can reciprocate relative to the valve body along the valve cavity axis and switch between a first position and a second position. In the first position, the valve core assembly is axially abutting against the bottom sealing structure 7. In the second position, the valve core assembly is axially abutting against the top sealing structure 1. In this embodiment, the valve core assembly is a split structure, consisting of an upper valve core 5 and a lower valve core 6 connected by threads to reduce processing difficulty and facilitate independent maintenance and replacement. At the same time, multiple first seals are provided on the outer periphery of the threaded connection between the upper valve core 5 and the lower valve core 6. Ring 8 is used to block possible bypass leakage channels formed along the thread meshing gap and maintain effective isolation between the internal and external cavities of the valve core assembly under conditions of low temperature, vibration, and assembly tolerance superposition. To ensure that the valve core assembly maintains linear guidance during ball screw transmission and avoids rotation relative to the valve body, a guide support is set in the valve cavity. The guide support and the relative mating surface of the valve core assembly form a sliding guide relationship. The guide support is fixed to the mounting base on the end cover or valve body by screws. The radial clearance of the guide fit is selected according to the sliding fit standard to reduce the wobble during the movement and ensure coaxial contact and line contact pressure distribution with the top sealing structure 1 and the bottom sealing structure 7 at the moment of contact. The end cover and the valve body are detachably connected by circumferentially distributed screws. The second sealing ring 12 is set in the annular sealing groove of the mating surface of the two to form a static sealing barrier to the outside of the valve cavity.

[0039] The bottom sealing structure 7 is arranged in the lower part of the valve cavity, opposite to the inlet, and its sealing surface matches the lower end face of the valve core assembly to achieve axial contact when the valve core assembly is in the first position; the top sealing structure 1 is arranged in the upper part of the valve cavity, opposite to the circulation precooling port 2, and its sealing position is adapted to the relative arrangement of the end cover and valve sleeve to achieve another axial contact when the valve core assembly is in the second position; the outlet on the valve body is located in the middle of the right side and is perpendicular to the axis of the inlet; the circulation precooling port 2 on the upper right side wall of the valve body is connected to the circumferential annular cavity inside the valve body through the aforementioned lateral through hole; the blowout port 4 in the middle of the side wall of the valve body is arranged opposite to the middle section of the valve cavity and does not participate in the passage switching during normal liquid supply or precooling switching, but is only used during maintenance purging or residual removal by placing the valve core assembly in the middle position and aligning it with the corresponding cavity.

[0040] During assembly, the valve sleeve is first positioned and installed into the valve body's inner bore, ensuring coaxiality with the valve body. Then, the bottom sealing structure 7 is installed in the sealing seat at the bottom of the valve cavity. Subsequently, the top sealing structure 1 and the second sealing ring 12 are pre-installed on the mounting surface of the end cover. The ball screw transmission mechanism 10, the guide support, and the valve core assembly are arranged sequentially in the valve cavity. Then, the end cover and the valve body are reliably fixed with screws. When assembling the valve core assembly, the upper valve core 5 and the lower valve core 6 are first threaded together, and the first sealing ring 8 is installed on their outer circumference. Then, the nut of the transmission mechanism is fixed to the valve core assembly with screws, so that the ball screw transmission mechanism 10 drives the valve core assembly to move smoothly along the axial direction. At the same time, the radial runout is controlled by the sliding fit between the outer circle of the valve core and the inner bore of the valve sleeve, ensuring that the two sealing structures obtain a stable sealing line load when they come into contact.

[0041] In this embodiment, the support and sealing system used within the valve cavity enclosed by the valve body and end cover is further optimized to adapt to low-temperature media and vibration conditions. The deep groove ball bearing used to support the transmission components is preferably a type with its own sealing ring or a structure with additional sealing rings on both sides of its seat bore, forming a first local isolation between the bearing working area and the medium area of ​​the valve cavity. Simultaneously, the upper and lower sealing positions of the valve cavity adopt a sealing ring structure with a top sealing structure 1 and a bottom sealing structure 7, respectively. The sealing rings are made of polychlorotrifluoroethylene and installed with an annular groove. During assembly, they are pre-tightened axially or radially according to the pre-compression ratio to ensure stable contact under low-temperature contraction and pressure pulsation conditions. To prevent the medium from flowing along the transmission channel... On the drive side, a fourth sealing ring 11 (pan-locking ring) is added between the ball screw transmission mechanism 10 and the end cover at the part where the ball screw transmission mechanism 10 passes through the end cover. This sealing ring is set in the sealing groove of the through hole of the end cover and forms a sealing pair with the outer surface of the ball screw transmission mechanism 10. In addition to the static sealing of the end cover and valve body mating surface by the second sealing ring 12, it forms an independent sealing barrier at the transmission shaft channel. Together with the first sealing ring 8 on the outer periphery of the threaded connection of the valve core assembly, it blocks potential bypasses. Overall, a partitioned sealing relationship is established between the bearing area, the transmission channel and the valve cavity medium area, which prevents the medium from entering the motor side space through the ball screw channel and improves the long-term sealing reliability and maintenance convenience of the whole valve under low temperature, high pressure and vibration environment.

[0042] How this example works

[0043] Step 1: The external drive motor drives the ball screw transmission mechanism 10 to move the valve core assembly downward to the first position. The valve core assembly axially abuts against the bottom sealing structure 7. The axial passage from the inlet to the lower part of the valve cavity is shut off at the bottom seal. At the same time, the circumferential annular cavity between the inlet and the bottom sealing structure 7 is connected to the circulation precooling port 2 through the lateral through hole in the side wall of the valve body. Thus, the lateral flow of the precooling branch is realized inside the valve body. At this time, the blow-out port 4 is not aligned with the middle section of the valve core assembly and remains closed. The outlet side cavity does not participate in the flow in this state.

[0044] Step 2: The external drive motor drives the ball screw transmission mechanism 10 in reverse to move the valve core assembly upward to the second position. The valve core assembly abuts axially with the top sealing structure 1. The pre-cooling flow path located in the upper part of the valve cavity is shut off at the top seal. The bottom sealing structure 7 no longer abuts with the valve core assembly. The inlet turns to the outlet through the flow channel around the valve core assembly to achieve main path connection. In the above reciprocating process, the first sealing ring 8 forms a bypass blockage on the outer periphery of the upper and lower valve core threaded connection, the second sealing ring 12 forms a static seal on the mating surface of the end cover and the valve body, and the guide support provides axial guidance and positional consistency for the valve core assembly.

[0045] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An aerospace electric valve with a built-in ball screw, characterized in that: It includes a valve body, an end cap disposed at the upper end of the valve body, a ball screw drive mechanism (10) disposed in the valve body, a valve core assembly connected to the ball screw drive mechanism (10) and located in the valve cavity of the valve body, a bottom sealing structure (7) disposed at the lower part of the valve cavity, and a top sealing structure (1) disposed at the upper part of the valve cavity. The valve body is provided with an inlet, an outlet and a circulating precooling port (2); A valve sleeve is provided inside the valve cavity, and the valve core assembly is disposed inside the valve sleeve; The ball screw transmission mechanism (10) is arranged in the valve body and is used for transmission connection with the drive motor; The valve core assembly is fixedly connected to the ball screw transmission mechanism (10) and is movable relative to the valve body along the axial direction of the valve cavity; The bottom sealing structure (7) is located at the lower part of the valve cavity, opposite to the inlet; The top sealing structure (1) is located at the upper part of the valve cavity, opposite to the circulating precooling port (2); The outer circle of the valve sleeve and the inner wall of the valve body form a circumferential annular cavity in the axial direction between the inlet and the bottom sealing structure (7); The valve body sidewall is provided with a lateral through hole that communicates with the circumferential annular cavity; The lateral through hole is connected to the circulating precooling port (2); The valve core assembly moves between a first position and a second position under the drive of the ball screw transmission mechanism (10), wherein: In the first position, the valve core assembly abuts against the bottom sealing structure (7); In the second position, the valve core assembly abuts against the top sealing structure (1).

2. The aerospace electric valve with a built-in ball screw according to claim 1, characterized in that: The ball screw transmission mechanism (10) includes a ball screw and a nut that cooperates with it, and the nut is fixedly connected to the valve core assembly.

3. The aerospace electric valve with a built-in ball screw according to claim 1, characterized in that: The valve core assembly is a split structure, including an upper valve core (5) and a lower valve core (6) that are threaded together.

4. The aerospace electric valve with a built-in ball screw according to claim 3, characterized in that: Multiple first sealing rings (8) are provided on the outer periphery of the threaded connection between the upper valve core (5) and the lower valve core (6).

5. An aerospace electric valve with a built-in ball screw according to any one of claims 3 or 4, characterized in that: A guide support is provided inside the valve cavity. The guide support cooperates with the valve core assembly to restrict the rotation of the valve core assembly relative to the valve body and guide it axially.

6. An aerospace electric valve with a built-in ball screw according to claim 5, characterized in that: The inlet is located at the bottom of the valve body, the outlet is located in the middle section of the side of the valve body and is perpendicular to the inlet axis, and the circulating precooling port (2) is located on the upper right side wall of the valve body.

7. The aerospace electric valve with a built-in ball screw according to claim 1, characterized in that: The valve body sidewall is provided with a blow-out port (4), which is located in the middle of the valve cavity and is positioned opposite to the middle section of the valve core assembly.

8. An aerospace electric valve with a built-in ball screw according to claim 5, characterized in that: The end cap and the valve body are detachably connected by screws, and a second sealing ring (12) is installed between the end cap and the valve body to isolate the internal medium of the valve body from flowing to the outside.

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