Coaxial motor-driven pintle actuating device with double gas channels

Abstract

The invention discloses a coaxial motor-driven pintle actuating device with double gas channels, which comprises a pintle used for moving back and forth under the driving of a servo actuating motor so as to change the shielding area of the pintle to the outlet of a propellant flow channel and further adjust the flow of the propellant; the rear end of the spray pipe converges, the spray pipe sleeves the rear half section of the pintle, the spray pipe and the pintle are coaxially arranged, the two fuel gas channel shells are front-back through shells, and fuel gas channels are formed in the two fuel gas channel shells; a gap between the two fuel gas channel shells is used for containing the front end of the pintle and a radial push rod and a tightening component of the servo actuation motor, and the fuel gas channels are used for receiving fuel gas and conveying the fuel gas to the spray pipe on the premise that the fuel gas does not make contact with the front end of the pintle. On the premise that the overall length and space of an engine are not sacrificed, coaxial movement of the pintle and gas flow, reliable dynamic sealing in the reciprocating movement process of the pintle and long-time efficient thermal protection of the servo actuation motor can be achieved at the same time.

Description

Technical Field

[0001] This invention belongs to the field of coaxial needle-operated actuators, and particularly relates to a coaxial motor-driven needle-operated actuator with dual gas channels. Background Technology

[0002] The development of needle-bolt variable thrust engines is still in the early stages of engineering prototype development, and most designs focus on non-coaxial needle-bolt actuators for ground-based experiments. Compared to non-coaxial structures, coaxial needle-bolt engines offer advantages such as lower negative mass and more balanced flow field development within the combustion chamber. Furthermore, compared to existing gas-driven and vortex valve-driven methods, direct electric motor drive offers advantages such as faster response times, higher control precision, no need for an external gas source, and lightweight, compact design that does not rely on propellant combustion. Current needle-bolt engines cannot achieve coaxial needle-bolt arrangement and miniaturized design due to technical bottlenecks in sealing and thermal protection. Summary of the Invention

[0003] The purpose of this invention is to provide a needle bolt actuation device driven by a coaxial motor with dual gas passages, so as to solve the problem that existing needle bolt motors cannot achieve coaxial arrangement and miniaturization of the needle bolt.

[0004] This invention adopts the following technical solution: a needle-bolt actuation device driven by a coaxial motor with dual gas passages, comprising:

[0005] The needle plug, whose front end is connected to a servo actuator motor, is used to move back and forth under the drive of the servo actuator motor, thereby changing its blocking area on the propellant flow channel outlet and thus adjusting the propellant flow rate.

[0006] The nozzle converges at its rear end and is fitted onto the rear half of the needle plug and is coaxially arranged with the needle plug. The front end of the nozzle has a motion hole for the front end of the needle plug to extend forward into the nozzle cavity, thereby connecting the front end of the needle plug to the servo motor.

[0007] The two gas passage housings are through-hole housings, each containing a gas passage. Both are located at the front end of the nozzle and are connected to the nozzle. The gap between the two gas passage housings is used to accommodate the front end of the needle plug and the radial push rod and compression component of the servo actuator motor. The gas passage is used to receive gas and deliver the gas to the nozzle without contacting the front end of the needle plug.

[0008] The beneficial effects of this invention are:

[0009] This invention uses a servo motor to directly drive the needle bolt to reciprocate along the engine axis, thereby changing the size of the engine throat area to change the engine combustion chamber pressure and overall thrust.

[0010] The gas channel housing of the present invention enables the flow of propellant gas, and a radial push rod and a compression component for installing a servo actuator motor are used between the two gas channel housings, while ensuring the coaxial installation of the pin and the propellant gas flow direction;

[0011] This invention can achieve, without sacrificing the overall length and space of the engine, the coaxial movement of the needle plug and the gas flow, the reliable dynamic sealing of the reciprocating motion of the needle plug, and the long-term efficient thermal protection of the servo actuator motor.

[0012] The transmission rod and the needle head of the present invention are connected by a heat insulation sleeve, which can ensure that the needle can resist the combustion chamber gas and condensed phase erosion for a long time while ensuring a stable and reliable connection. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the present invention;

[0014] Figure 2 This is a schematic diagram of the structure of the needle plug of the present invention;

[0015] Figure 3 This is a three-dimensional sectional view of the present invention.

[0016] Among them: 10. Needle bolt; 11. Servo actuation motor; 12. Nozzle; 13. Gas passage housing; 15. Boss; 16. Limiting hole; 17. Motion hole; 18. Limiting rod; 19. Transmission rod; 20. Needle bolt head; 21. Fixing rod; 22. Clamping rod; 23. Combustion chamber; 24. Inner sleeve; 25. Outer sleeve; 26. Pin. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0018] In the description of this invention, 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 the invention 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 the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "multiple" means two or more. The term "orientation" in this invention refers to the orientation of the device or element according to the invention. Figure 1Description of the state's progression.

[0019] This invention discloses a coaxial motor-driven pin-operated actuating device with dual gas passages, such as... Figure 1-3 As shown, it includes: needle plug 10, nozzle 12, and two gas passage housings 13.

[0020] The front end of the needle plug 10 is connected to the servo motor 11. The needle plug 10 is used to move back and forth under the drive of the servo motor 11, thereby changing its blocking area on the propellant flow channel outlet and thus adjusting the propellant flow rate.

[0021] The rear end of the nozzle 12 converges and is fitted onto the rear half of the needle plug 10 and is coaxially arranged with the needle plug 10. The front end of the nozzle 12 is provided with a motion hole 17, which is used for the front end of the needle plug 10 to extend forward into the inner cavity of the nozzle 12, thereby connecting the front end of the needle plug 10 with the servo motor 11.

[0022] Both gas passage housings 13 are through-hole housings, and both gas passage housings 13 contain gas passages. Both gas passage housings 13 are located at the front end of the nozzle 12 and are connected to the nozzle 12. The gap between the two gas passage housings 13 is used to accommodate the front end of the needle plug 10 and the radial push rod and compression component of the servo actuation motor 11. The gas passage is used to receive gas and deliver the gas to the nozzle 12 without contacting the front end of the needle plug 10.

[0023] This configuration ensures that the radial push rod and compression component of the servo actuator motor are isolated from the high-temperature gas inside the gas passage housing 13, preventing the radial push rod and compression component of the servo actuator motor from being exposed to the high temperature of the gas, thereby reducing the need for heat protection treatment of the radial push rod and compression component of the servo actuator motor.

[0024] A protruding boss 15 is integrally connected to the outer wall of the front end of the nozzle 12. A limiting hole 16 is opened through the center of the boss 15 along the front-back direction. The limiting hole 16 is coaxially arranged with the motion hole 17. The limiting hole 16 is used for the front end of the needle bolt 10 to pass through the motion hole 17 and extend forward out of the limiting hole 16, and connect to the servo actuation motor 11.

[0025] The pin 10, from front to back, includes a limiting rod 18, a transmission rod 19, and a pin head 20, all coaxially arranged. The limiting rod 18, from front to back, consists of a fixed rod 21 and a locking rod 22, integrally connected and coaxially arranged. The fixed rod 21 is used to connect to the servo actuation motor 11. The rear end of the locking rod 22 has a connecting groove from back to front, and the connecting groove has an internal thread that connects to the front end of the transmission rod 19. The front end of the transmission rod 19 protrudes forward and extends into the connecting groove to connect to the rear end of the locking rod 22.

[0026] The transmission rod 19 and the needle head 20 are connected by a heat insulation sleeve. The heat insulation sleeve includes an inner sleeve 24 and an outer sleeve 25 arranged coaxially. The outer sleeve 25 is fitted around the inner sleeve 24. The inner sleeve 24 is a groove-shaped structure with an open front end and a closed rear end. The front end of the inner sleeve 24 is integrally connected to the front end of the outer sleeve 25. The outer sleeve 25 is a groove-shaped structure with an open rear end and an integrally connected front end to the front end of the inner sleeve 24. The front opening of the inner sleeve 24 is used for the rear end of the transmission rod 19 to extend into. The annular gap between the inner sleeve 24 and the outer sleeve 25 is used for the front end of the needle head 20 to be inserted, thereby fixing the inner sleeve 24, the outer sleeve 25, the transmission rod 19 and the needle head 20 in the left and right directions with the pin 26.

[0027] Two sealing rings are provided on the front half of the transmission rod 19 at the position corresponding to the boss 15.

[0028] The present invention also discloses an engine with a needle-operated device, comprising: a combustion chamber 23, two gas passage housings 13 and a nozzle 12 connected sequentially from front to back, wherein the nozzle 12 is equipped with a needle-operated device.

[0029] Example

[0030] In this embodiment, a Φ180-210mm propellant combustion chamber 23 is selected, which is connected to two gas channel housings 13 by a flange. The two gas channel housings 13 are arc-shaped strip channels with a length of 110mm, a height of 100mm, and a maximum width of 55mm along the front-rear direction. The gap between the two gas channel housings 13 is ≥60mm. The boss 15 has a long half-axis of 108mm, a short half-axis of 94mm, and a width of 50mm, and is an ellipsoidal structure. The limiting hole 16 on the boss 15 is Φ10mm. The needle bolt 10 has a length of 127mm and a maximum outer diameter of 20mm. Two sealing rings are set at the position of the boss 15, 10mm from the front end of the transmission rod 19. The diameter of the pin is Φ3mm.

[0031] The radial push rod and clamping component of the servo actuator 11 are installed in the gap between the two gas passage housings 13, effectively reducing the thermal protection pressure of the servo actuator 11. The servo actuator 11 adopts a servo motor radial reduction mechanism to drive the ball screw in a push-pull electric cylinder design. The servo motor is equipped with a brake and is installed in a folding manner. The front end of the radial push rod is connected to the cantilever push-pull rod and the limit rod 18 shaft. Among them, the ball screw nut pair is selected as the standard ball screw 1205; the 40 series servo motor is selected, with a power of 200W, a rated torque of 0.64N·m, and a rated speed of 3000rpm.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A needle-bolt actuation device driven by a coaxial motor with dual gas passages, characterized in that, include: The needle plug (10) is connected to the front end of the servo motor (11) and is used to move back and forth under the drive of the servo motor (11), thereby changing its blocking area on the propellant flow channel outlet and thus adjusting the propellant flow rate. The nozzle (12) converges at its rear end and is fitted onto the rear half of the needle plug (10) and is coaxially arranged with the needle plug (10). The nozzle (12) has a motion hole (17) at its front end. The motion hole (17) is used for the front end of the needle plug (10) to extend forward into the inner cavity of the nozzle (12), thereby connecting the front end of the needle plug (10) with the servo motor (11). The two gas passage housings (13) are through housings that run from front to back. Both housings contain gas passages and are located at the front end of the nozzle (12) and connected to the nozzle (12). The gap between the two gas passage housings (13) is used to accommodate the front end of the needle plug (10) and the radial push rod and compression component of the servo actuation motor (11). The gas passages are used to receive gas and deliver the gas to the nozzle (12) without contacting the front end of the needle plug (10).

2. The needle-bolt actuation device with a coaxial motor drive and dual gas passages according to claim 1, characterized in that, The nozzle (12) has a forward-protruding boss (15) integrally connected to the outer wall of the front end. A limiting hole (16) is opened through the center of the boss (15) along the front-back direction. The limiting hole (16) is coaxially arranged with the motion hole (17). The limiting hole (16) is used for the front end of the needle bolt (10) to pass through the motion hole (17) and extend forward out of the limiting hole (16), and connect to the servo actuation motor (11).

3. The needle-bolt actuation device with a coaxial motor drive and dual gas passages according to claim 2, characterized in that, The needle plug (10) includes, from front to back, a limiting rod (18), a transmission rod (19), and a needle plug head (20) arranged coaxially; The limiting rod (18) is composed of a fixed rod (21) and a clamping rod (22) that are integrally connected and coaxially arranged from front to back. The fixed rod (21) is used to connect with the servo motor (11). The rear end of the clamping rod (22) is provided with a connecting groove from back to front. The connecting groove is provided with an internal thread and is threaded to the front end of the transmission rod (19).

4. A needle-bolt actuation device with a coaxial motor drive and dual gas passages according to claim 3, characterized in that, The front end of the transmission rod (19) protrudes forward and extends into the connecting groove to be threadedly connected to the rear end of the clamp rod (22).

5. A needle-bolt actuation device with a coaxial motor driven and having dual gas passages according to claim 3, characterized in that, The transmission rod (19) and the needle head (20) are connected by a heat insulation sleeve. The heat insulation sleeve includes an inner sleeve (24) and an outer sleeve (25) arranged coaxially. The outer sleeve (25) is fitted around the inner sleeve (24). The inner sleeve (24) is a groove-shaped structure with an open front end and a closed rear end. The front end of the inner sleeve (24) is integrally connected to the front end of the outer sleeve (25). The outer sleeve (25) is a groove-shaped structure with an open rear end and an integrally connected front end to the front end of the inner sleeve (24). The front opening of the inner sleeve (24) is used for the rear end of the transmission rod (19) to extend into. The annular gap between the inner sleeve (24) and the outer sleeve (25) is used for the front end of the needle head (20) to be inserted, thereby allowing the pin (26) to fix the inner sleeve (24), the outer sleeve (25), the transmission rod (19), and the needle head (20) in the left and right directions.

6. A needle-bolt actuation device with a coaxial motor driven and having dual gas passages according to claim 3, characterized in that, Two sealing rings are provided on the front half of the transmission rod (19) at the position corresponding to the boss (15).

7. An engine comprising a pin-operated device as described in any one of claims 1-6, characterized in that, include: The combustion chamber (23), the gas passage housing (13), and the nozzle (12) are connected sequentially from front to back, and the nozzle (12) is equipped with a needle-operated device.

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