A small tactical missile with a wobble nozzle

Abstract

The present application is suitable for the technical field of solid rocket engine nozzle, and provides a swing nozzle for small tactical missile, which comprises a fixed body, a movable body, a driving mechanism connected with the movable body, and a separation surface between the movable body and the fixed body located downstream of the throat of the swing nozzle, wherein the movable body is connected with the fixed body through spherical surface cooperation to form movable connection, so that the movable body can swing around the swing ball center, and the driving mechanism is used to drive the movable body to swing around the swing ball center. The swing nozzle for small tactical missile provided by the present application sets the separation surface between the movable body and the fixed body downstream of the throat of the swing nozzle, which can significantly reduce the friction resistance between the separation surface of the movable body and the fixed body, and the swing nozzle can be driven to swing by using a driving mechanism with small power and small size, so that the swing nozzle is light and small in size, the production cost of the swing nozzle is reduced, and the swing nozzle is convenient for application in small tactical missile.

Description

Technical Field

[0001] This invention relates to the field of nozzle technology for solid rocket engines, and more specifically to a swing nozzle for a small tactical missile. Background Technology

[0002] Missiles and rockets achieve flight requirements such as rapid maneuvering during the active phase, vertical launch with turning, over-the-shoulder launch, and high-altitude aerodynamic flight through thrust vector control of solid rocket engines. The use of oscillating nozzles in small tactical missiles is one of the most important methods of thrust vector control for solid rocket engines.

[0003] In existing technologies, oscillating nozzles for large tactical missiles are highly mature and mainly used in medium and large solid rocket motors. However, for small tactical weapon solid rocket motors, miniaturizing oscillating nozzles for small tactical missiles faces technological bottlenecks. The moving and fixed bodies of the oscillating nozzle typically connect via a spherical joint, with a drive mechanism propelling the moving body to oscillate around the center of the oscillating sphere. Because the separation surface between the moving and fixed bodies in traditional oscillating nozzles is located upstream of the nozzle throat, and the internal pressure at this location corresponds to the high pressure upstream of the nozzle throat, the friction between the moving and fixed bodies is high. This necessitates a high-power and large-volume drive mechanism to achieve the oscillation of the moving body, making miniaturization difficult and increasing production costs, thus limiting the application of oscillating nozzles in small tactical missiles. Summary of the Invention

[0004] This invention provides a small tactical missile oscillating nozzle, aiming to solve the problems of existing oscillating nozzles being difficult to miniaturize and having high production costs.

[0005] The present invention is implemented as follows: a small tactical missile oscillating nozzle is provided, comprising:

[0006] Fixed body;

[0007] A movable body, wherein the movable body and the fixed body are movably connected via a spherical fit, allowing the movable body to oscillate around the center of the oscillating sphere along its entire axis, and the separation surface between the movable body and the fixed body is located downstream of the throat of the oscillating nozzle; and

[0008] A drive mechanism connected to the movable body is used to drive the movable body to swing around the center of the oscillating ball along its entire axis.

[0009] Preferably, the fixed body is provided with a first spherical body, and the movable body includes a nozzle diffuser section and a second spherical body fixed to the nozzle diffuser section. The second spherical body and the first spherical body form a spherical fit, and the nozzle diffuser section and the fixed body form the separation surface through the spherical fit.

[0010] Preferably, the first spherical body of the fixed body and the second spherical body of the movable body are sealed by a sealing element.

[0011] Preferably, the drive mechanism includes:

[0012] A first driving mechanism connected to the movable body is used to drive the movable body to swing up and down around the center of the swing ball;

[0013] A second drive mechanism connected to the movable body is used to drive the movable body to swing left and right around the center of the swing ball.

[0014] Preferred options also include:

[0015] A first connecting pin is connected to the movable body, and the first driving mechanism is connected to the first connecting pin and drives the movable body to swing up and down around the center of the swing ball through the first connecting pin;

[0016] A second connecting pin is connected to the movable body, and the second driving mechanism is connected to the second connecting pin and drives the movable body to swing left and right around the center of the swing ball through the second connecting pin.

[0017] Preferred options also include:

[0018] An anti-torsion member is fixed to the fixed body. The anti-torsion member forms a spherical fit with the movable body. The anti-torsion member is provided with guide grooves that correspond to the first connecting pin and the second connecting pin respectively. The first connecting pin and the second connecting pin pass through the corresponding guide grooves and are connected to the movable body.

[0019] Preferably, the anti-torsion member has a third spherical body, and the anti-torsion member wraps around the second spherical body of the movable body through the third spherical body, and the anti-torsion member forms a spherical fit with the second spherical body of the movable body through the third spherical body.

[0020] Preferably, a graphite lubricant is provided between the anti-torsion component and the movable body.

[0021] Preferred options also include:

[0022] The sleeve that encloses the anti-torsion component has through holes that correspond one-to-one with the guide grooves. The first connecting pin and the second connecting pin pass through the corresponding through holes and the corresponding guide grooves and are connected to the movable body.

[0023] The present invention provides a oscillating nozzle for a small tactical missile. By setting the separation surface of the moving body and the fixed body downstream of the throat of the oscillating nozzle, the internal pressure downstream of the throat of the oscillating nozzle is much smaller than that upstream of the throat. This greatly reduces the pressure inside the oscillating nozzle at the separation surface of the moving body, and significantly reduces the frictional resistance between the separation surface of the moving body and the fixed body. Therefore, a low-power and small-size drive mechanism can be used to drive the oscillating nozzle to swing, which facilitates the miniaturization of the oscillating nozzle, reduces the production cost of the oscillating nozzle, and facilitates its application in small tactical missiles. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a small tactical missile oscillating nozzle provided for an embodiment of the present invention. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0026] The present invention provides a small tactical missile oscillating nozzle by setting the separation surface of the moving body and the fixed body downstream of the throat of the oscillating nozzle. Since the internal pressure downstream of the throat of the oscillating nozzle is much smaller than the internal pressure upstream of the throat, the pressure inside the oscillating nozzle at the separation surface of the moving body can be greatly reduced, and the frictional resistance between the separation surface of the moving body and the fixed body can be significantly reduced. Therefore, a low-power and small-size drive mechanism can be set to drive the oscillating nozzle to swing, which facilitates the miniaturization of the oscillating nozzle, reduces the production cost of the oscillating nozzle, and facilitates the application of the oscillating nozzle in small tactical missiles.

[0027] Please refer to Figure 1 This invention provides a small tactical missile oscillating nozzle, comprising:

[0028] Fixing body 1;

[0029] Movable body 2 is connected to fixed body 1 via a spherical fit. Movable body 2 can oscillate around the center of the oscillating sphere, and the separation surface 3 between movable body 2 and fixed body 1 is located downstream of the throat of the oscillating nozzle; and

[0030] The drive mechanism connected to the movable body 2 is used to drive the movable body 2 to swing around the center of the swing ball along the entire axis.

[0031] In this embodiment of the invention, the fixed body 1 is provided with a first spherical body 11, and the movable body 2 includes a nozzle diffuser section 21 and a second spherical body 22 fixed to the nozzle diffuser section 21. The second spherical body 22 and the first spherical body 11 form a spherical fit, and the nozzle diffuser section 21 and the fixed body 1 form a separation surface 3 through the spherical fit. The separation surface 3 between the movable body 2 and the fixed body 1 refers to the mating surface of the movable body 2 that is close to the inner hole of the nozzle and can be separated from the movable body 2 during rotation relative to the fixed body 1.

[0032] The second spherical body 22 forms a spherical fit with the first spherical body 11 and is set at the same center. The second spherical body 22 can rotate relative to the first spherical body 11.

[0033] In this embodiment of the invention, the throat 16 of the oscillating nozzle is located at the tail end of the fixed body 1. The fixed body 1 includes a body 12 and a non-metallic heat insulation layer 13 bonded to the outer surface of the body 12. The first spherical body 11 is specifically disposed on the non-metallic heat insulation layer 13. The body 12 is specifically a metal structural component, and the non-metallic heat insulation layer 13 can withstand the high pressure and high temperature gas in the solid rocket motor combustion chamber.

[0034] In this embodiment of the invention, the movable body 2 also wraps around the nozzle diffuser section 21 with a wrapping layer 24. The second spherical body 22 is specifically disposed at one end of the wrapping layer 24. Alternatively, the second spherical body 22 can also be directly disposed at one end of the nozzle diffuser section 21. The driving mechanism can drive the movable body 2 to swing around two directions perpendicular to the central axis of the swing nozzle, and the two swing directions of the movable body 2 are perpendicular to each other. That is, the driving mechanism can drive the movable body 2 to swing up, down, left, and right, realizing that the movable body 2 swings around the center of the swing sphere in a full-axis manner.

[0035] In this embodiment of the invention, both the second spherical body 22 and the first spherical body 11 are made of wear-resistant and heat-insulating materials, which greatly improves the reliability of the fit between the second spherical body 22 and the first spherical body 11.

[0036] In this embodiment of the invention, by setting the separation surface 3 between the movable body 2 and the fixed body 1 downstream of the throat of the oscillating nozzle, since the gas inside the oscillating nozzle flows from upstream to downstream of the throat 16, the internal pressure downstream of the throat 16 is much smaller than the internal pressure upstream of the throat 16. This can greatly reduce the pressure inside the oscillating nozzle at the separation surface 3 between the movable body 2 and the fixed body 1, and significantly reduce the frictional resistance between the movable body 2 and the fixed body 1. Thus, a low-power and small-size drive mechanism can be used to drive the movable body 2 of the oscillating nozzle to oscillate, making it easy to miniaturize the drive mechanism, which in turn facilitates the miniaturization of the oscillating nozzle and reduces the production cost of the oscillating nozzle, making it easier to apply the oscillating nozzle to small tactical missiles.

[0037] In this embodiment of the invention, the separation surface 3 between the movable body 2 and the fixed body 1 is located at the contact position between the throat 16 of the oscillating nozzle and the nozzle diffuser section 21, so that the separation surface 3 between the movable body 2 and the fixed body 1 is set against the airflow direction, so as to avoid a large number of particulate components of the combustion products of the solid propellant entering the gap between the separation surface 3 between the movable body 2 and the fixed body 1, which would cause the movable body 2 to oscillate and get stuck.

[0038] As an embodiment of the present invention, the first spherical body 11 of the fixed body 1 and the second spherical body 22 of the movable body 2 are sealed by a sealing element 4.

[0039] Specifically, the sealing element 4 can be installed by setting an installation groove in the fixed body 1 or in the movable body 2.

[0040] In this embodiment, the first spherical body 11 of the fixed body 1 and the second spherical body 22 of the movable body 2 are sealed by a sealing element 4 to achieve a seal between the mating surfaces of the fixed body 1 and the movable body 2, preventing the gas inside the nozzle from overflowing from the mating surfaces of the fixed body 1 and the movable body 2.

[0041] In one embodiment of the present invention, the sealing element 4 is a rubber sealing ring, a polytetrafluoroethylene (PTFE) sealing ring, or a metal sealing ring. In practical applications, O-rings, C-rings, PTFE rings, metal sealing rings, etc., can be selected, but are not limited to.

[0042] As one embodiment of the present invention, the driving mechanism includes:

[0043] The first drive mechanism 51, which is connected to the movable body 2, is used to drive the movable body 2 to swing up and down around the center of the swing ball.

[0044] The second drive mechanism (not shown) connected to the movable body 2 is used to drive the movable body 2 to swing left and right around the center of the swing ball.

[0045] In this embodiment, the first drive mechanism 51 and the second drive mechanism are respectively connected to the nozzle diffuser section 21 of the movable body 2, and the first drive mechanism 51 and the second drive mechanism are distributed outside the swing nozzle and arranged at a 90-degree interval. Specifically, the first drive mechanism 51 can drive the movable body 2 to swing up and down around the center of the swing sphere, and the second drive mechanism can drive the movable body 2 to swing left and right around the center of the swing sphere. In this way, through the coordinated cooperation of the first drive mechanism 51 and the second drive mechanism, the nozzle diffuser section 21 of the movable body 2 can be swinged up, down, left, and right, realizing the full-axis swing of the nozzle diffuser section 21 of the movable body 2, thereby realizing the control of the thrust vector of the fixed rocket engine. In this embodiment, the first drive mechanism 51 and the second drive mechanism can be servo motors. Of course, other drive mechanisms can also be used.

[0046] As one embodiment of the present invention, it also includes:

[0047] The first connecting pin 6 is connected to the movable body 2. The first driving mechanism 51 is connected to the first connecting pin 6 and drives the movable body 2 to swing up and down around the center of the swing ball through the first connecting pin 6.

[0048] The second connecting pin (not shown) is connected to the movable body 2. The second drive mechanism is connected to the second connecting pin and drives the movable body 2 to swing left and right around the center of the swing ball through the second connecting pin.

[0049] In this embodiment, the first connecting pin 6 and the second connecting pin are orthogonally arranged, that is, the first connecting pin 6 and the second connecting pin are perpendicular to each other. The first driving mechanism 51 drives the movable body 2 to swing up and down around the center of the swing ball by pushing and pulling the first connecting pin 6, or it can drive the first connecting pin 6 to rotate or turn to drive the movable body 2 to swing up and down around the center of the swing ball. The second driving mechanism drives the movable body 2 to swing left and right around the center of the swing ball by pushing and pulling the second connecting pin, or it can drive the second connecting pin to rotate or turn to drive the movable body 2 to swing left and right around the center of the swing ball. The swing angle range of the movable body 2 can be designed according to actual needs.

[0050] As one embodiment of the present invention, it also includes:

[0051] The anti-torsion component 7 is fixed to the fixed body 1. The anti-torsion component 7 forms a spherical fit with the movable body 2. The anti-torsion component 7 is provided with guide grooves 70 respectively corresponding to the first connecting pin 6 and the second connecting pin. The first connecting pin 6 and the second connecting pin pass through the corresponding guide grooves 70 and are connected to the movable body 2.

[0052] Specifically, the anti-torsion component 7 is provided with a third spherical body 71. The anti-torsion component 7 wraps around the second spherical body 22 of the movable body 2 through the third spherical body 71, and the anti-torsion component 7 and the second spherical body 22 of the movable body 2 form a spherical fit through the third spherical body 71. Among them, the first spherical body 11, the second spherical body 22 and the third spherical body 71 are arranged with the same center, and the second spherical body 22 is located between the third spherical body 71 and the first spherical body 11.

[0053] In this embodiment, when the movable body 2 of the oscillating nozzle oscillates along its entire axis, the second spherical body 22 on the movable body 2 contacts the third spherical body 71 on the anti-torsion component 7. This allows the anti-torsion component 7 to limit and support the movable body 2, preventing any load between the movable body 2 and the fixed body 1. The load is distributed on the anti-torsion component 7. The second spherical body 22 on the movable body 2 and the first spherical body 11 on the fixed body 1 provide a sealing function, while the second spherical body 22 on the movable body 2 and the spherical body on the anti-torsion component 7 provide an axial load function. This separation of sealing and load-bearing functions reduces the difficulty of processing the load-bearing and sealing surfaces, making it easier to achieve low cost. Consequently, the friction between the movable body 2 and the fixed body 1 can be greatly reduced, further reducing the required driving power of the drive mechanism. This can further reduce the power and size of the drive mechanism, lower production costs, reduce process difficulty, and facilitate the miniaturization design of the oscillating nozzle.

[0054] In this embodiment, the guide grooves 70 on the anti-torsion component 7 limit and guide the movement of the first connecting pin 6 and the second connecting pin, respectively. This ensures that the drive mechanism can only drive the first connecting pin 6 and the second connecting pin to move along their respective guide grooves 70, preventing the first connecting pin 6 and the second connecting pin from deviating during their movement and causing the moving body 2 to swing in a different direction. This prevents the moving body 2 from twisting and greatly improves the accuracy of the swing control of the moving body 2. Therefore, by setting the anti-torsion component 7, which limits, supports, and prevents the moving body 2 from twisting, the reliability of the operation is greatly improved, and the structure is simple and the implementation cost is low.

[0055] In this embodiment, the anti-torsion component 7 can be made of, but is not limited to, high-hardness wear-resistant materials such as bearing steel and ceramics.

[0056] In one embodiment of the present invention, a graphite lubricant 8 is provided between the anti-torsion member 7 and the movable body 2. Specifically, the graphite lubricant 8 is provided between the third spherical body 71 of the anti-torsion member 7 and the second spherical body 22 of the movable body 2. The graphite lubricant 8 can be fixed on the anti-torsion member 7 or on the movable body 2.

[0057] In this embodiment, the graphite lubricant 8 is configured as a spherical shape that mates with the third spherical body 71 and the second spherical body 22 of the movable body 2. Preferably, the graphite lubricant 8 can be fixed on the anti-torsion member 7, and the second spherical body 22 of the movable body 2 can rotate relative to the graphite lubricant 8. The graphite lubricant 8 provides lubrication, reducing the frictional resistance during the rotation of the movable body 2, thereby reducing the power of the drive mechanism. This further reduces the power and size of the drive mechanism, facilitating the miniaturization design of the oscillating nozzle.

[0058] As an embodiment of the present invention, the anti-torsion component 7 is assembled from two halves of a mating structure, which facilitates the fixed installation of the anti-torsion component 7. Specifically, the anti-torsion component 7 adopts, but is not limited to, a mating structure divided into two equal halves along the busbar, and the anti-torsion component 7 is respectively connected and fixed to the fixing body 1 via, but is not limited to, flanges 15.

[0059] As an embodiment of the present invention, it also includes a sleeve 9 that wraps the anti-torsion component 7. The sleeve 9 is provided with through holes 91 that correspond one-to-one with the guide grooves 70. The first connecting pin 6 and the second connecting pin pass through the corresponding through holes 91 and the corresponding guide grooves 70 respectively and are connected to the movable body 2.

[0060] In this embodiment, by setting a sleeve 9 to wrap the anti-torsion component 7, the sleeve 9 is used to wrap the anti-torsion component 7 tightly, making the connection of the two halves of the anti-torsion component 7 more stable, and at the same time enhancing the load-bearing capacity of the anti-torsion component 7.

[0061] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A swaying nozzle for a small tactical missile, characterized in that, The oscillating nozzle includes: Fixed body; A movable body, wherein the movable body and the fixed body are movably connected via a spherical fit, allowing the movable body to oscillate around the center of the oscillating sphere along its entire axis, and the separation surface between the movable body and the fixed body is located downstream of the throat of the oscillating nozzle; and A drive mechanism connected to the movable body is used to drive the movable body to swing around the center of the swing ball in a full-axis manner; the drive mechanism includes a first drive mechanism connected to the movable body and a second drive mechanism connected to the movable body, the first drive mechanism is used to drive the movable body to swing up and down around the center of the swing ball, and the second drive mechanism is used to drive the movable body to swing left and right around the center of the swing ball. A first connecting pin is connected to the movable body, and the first driving mechanism is connected to the first connecting pin and drives the movable body to swing up and down around the center of the swing ball through the first connecting pin; A second connecting pin is connected to the movable body, and the second driving mechanism is connected to the second connecting pin and drives the movable body to swing left and right around the center of the swing ball through the second connecting pin; An anti-torsion member fixed to the fixed body is provided, which forms a spherical fit with the movable body. The anti-torsion member is provided with guide grooves corresponding to the first connecting pin and the second connecting pin, respectively. The first connecting pin and the second connecting pin pass through the corresponding guide grooves and are connected to the movable body. The anti-torsion member is provided with a third spherical body, which wraps around the second spherical body of the movable body. The anti-torsion member forms a spherical fit with the second spherical body of the movable body through the third spherical body. A graphite lubricant is provided between the anti-torsion member and the movable body.

2. The oscillating nozzle for a small tactical missile according to claim 1, characterized in that, The fixed body is provided with a first spherical body, and the movable body includes a nozzle diffuser section and a second spherical body fixed to the nozzle diffuser section. The second spherical body and the first spherical body form a spherical fit, and the nozzle diffuser section and the fixed body form the separation surface through the spherical fit.

3. The oscillating nozzle for a small tactical missile according to claim 2, characterized in that, The first spherical body of the fixed body and the second spherical body of the movable body are sealed by a sealing element.

4. The oscillating nozzle for a small tactical missile according to claim 1, characterized in that, Also includes: The sleeve that encloses the anti-torsion component has through holes that correspond one-to-one with the guide grooves. The first connecting pin and the second connecting pin pass through the corresponding through holes and the corresponding guide grooves and are connected to the movable body.

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