An adjustable flux nozzle for a solid rocket motor

Abstract

This utility model relates to the field of solid rocket motor technology, specifically providing an adjustable flux nozzle for a solid rocket motor, comprising a nozzle housing, a throat liner, and an opening / closing mechanism. The throat liner is coaxially mounted within the nozzle housing, and a flow channel exists between the throat liner and the nozzle housing. The opening / closing mechanism is located within the flow channel and is used to control the flux through the flow channel. This utility model solves the problem of limited nozzle applicability caused by the constant flux at the throat of existing solid rocket motor nozzles.

Description

Technical Field

[0001] This utility model relates to the field of solid rocket engine technology, specifically providing an adjustable flux nozzle for a solid rocket engine. Background Technology

[0002] The throat diameter of a solid rocket motor nozzle is a key parameter, significantly impacting combustion chamber pressure, mass flow rate, combustion chamber thrust, and burn time, and determining the engine's internal ballistic characteristics. When the propellant burning rate varies or changes, the nozzle throat diameter needs to be adjusted accordingly, thereby adjusting the throat flux to ensure that the solid rocket's thrust, specific impulse, burn time, and other parameters meet design requirements.

[0003] The throat diameter of existing nozzles is not adjustable, resulting in a constant throat flux. When the flux is constant, the nozzle's applicability in different scenarios becomes limited. In engines using dual-base propellants, this significantly impacts engine productivity. Utility Model Content

[0004] This invention provides an adjustable flux nozzle for a solid rocket motor, which solves the problem of limited applicability of existing solid rocket motor nozzles due to the constant flux at the throat.

[0005] This utility model provides an adjustable flux nozzle for a solid rocket motor, comprising:

[0006] Nozzle housing;

[0007] The throat liner is coaxially mounted inside the nozzle housing, and a flow passage is provided between the throat liner and the nozzle housing;

[0008] An opening and closing mechanism is provided in the flow channel for controlling the flow rate of the flow channel.

[0009] According to the adjustable flow nozzle provided by this utility model, the nozzle housing includes an air inlet section, a throat section and an air jet section, and the throat liner is disposed in the throat section;

[0010] The throat liner includes a tube body and multiple support members. The multiple support members are arranged in a ring around the axis of the tube body on the outer wall of the tube body and are fixedly connected to the inner wall of the nozzle housing.

[0011] The flow channel is formed between adjacent support members.

[0012] According to the adjustable flow nozzle provided by this utility model, the nozzle housing has a receiving cavity corresponding to the flow channel;

[0013] The opening and closing mechanism includes:

[0014] Telescopic mechanism;

[0015] The slider is connected to the telescopic mechanism and is located within the flow channel. It can reciprocate along the radial direction of the flow channel as the telescopic mechanism extends and retracts.

[0016] The telescopic mechanism and part of the slider are located within the accommodating cavity, while the other part of the slider is located within the flow channel.

[0017] When the slider comes into contact with the outer wall of the tube, the slider and the tube can fit together completely.

[0018] According to the adjustable flow nozzle provided by this utility model, the telescopic mechanism includes:

[0019] Drive motor;

[0020] The electric telescopic pole body is connected to the drive motor and is used to perform telescopic movement under the drive of the drive motor.

[0021] According to the adjustable flow nozzle provided by this utility model, the drive motor is installed on the outer wall of the nozzle housing, one end of the electric telescopic rod body is connected to the drive motor, and the other end passes through the nozzle housing and extends into the accommodating cavity to be connected to the slider.

[0022] According to the adjustable flow nozzle provided by this utility model, the flow channels are multiple and are all evenly arranged in a ring along the circumference of the throat liner.

[0023] Accordingly, there are multiple sliders, each disposed in one of the multiple flow channels. The side of the slider closest to the tube has a concave arc surface, which can fit against the outer wall of the tube.

[0024] The beneficial effects of this utility model are:

[0025] This utility model provides an adjustable flux nozzle for solid rocket motors. By improving the traditional constant flux nozzle into a nozzle capable of adjusting the throat flux, it effectively solves the problem of limited applicability caused by the constant throat flux in existing solid rocket motor nozzles. Specifically:

[0026] By creating a flow channel between the nozzle housing and the throat liner, the flow rate of the flow channel is increased in addition to the flow rate of the throat liner, thus increasing the overall flow rate of the nozzle throat. By placing the opening and closing mechanism at the flow channel, the additional flow rate can be controlled to adapt to different application scenarios.

[0027] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the longitudinal cross-sectional structure of the adjustable flow nozzle with the opening and closing mechanism provided by this utility model in the closed state.

[0030] Figure 2 This is a schematic diagram of the cross-sectional structure of the adjustable flow nozzle with the opening and closing mechanism provided by this utility model in the closed state.

[0031] Figure 3 This is a longitudinal cross-sectional view of the adjustable flow nozzle with the opening and closing mechanism provided by this utility model in the open state.

[0032] Figure 4 This is a schematic diagram of the cross-sectional structure of the adjustable flow nozzle in the open state of the opening and closing mechanism provided by this utility model.

[0033] 1. Nozzle housing; 2. Support component; 3. Slider; 4. Drive motor; 5. Motor mounting bracket; 6. Pipe body; 7. Receptacle; 8. Electric telescopic rod body; 9. Inlet section; 10. Throat section; 11. Jet section; 12. Flow passage. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0035] In the description of the embodiments of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of 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. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0037] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0038] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0039] First, let's further introduce the background technology:

[0040] In engines using double-base propellants, the high pressure index of the propellant's chemical composition affects its burning rate stability. Different batches of propellant grains typically have different burning rates. Therefore, the nozzle throat diameter can often only be determined after the burning rate of the double-base propellant has been determined, which has a significant impact on the engine's production efficiency.

[0041] To ensure production efficiency, when using double-base propellants, the typical process flow is as follows: first, a conservative nozzle throat inner diameter is given, the nozzle is machined, and after the propellant burning rate is determined, the nozzle throat diameter is adjusted again according to the burning rate. The throat diameter position is then machined a second time, and finally, the final assembly is carried out.

[0042] This process can improve engine production efficiency to some extent, but problems still exist. In terms of machining, the secondary alignment and clamping introduces mechanical errors, causing positional misalignment between the throat diameter and other machined parts of the nozzle. It also carries the risk of machining errors rendering the entire nozzle unusable, while increasing machining costs. In terms of scheduling, previously, overall assembly could proceed immediately after the combustion chamber propellant loading was completed; now, it requires waiting for the nozzle's secondary machining before final assembly, adding a scheduling step and creating the risk of delays due to untimely scheduling.

[0043] Secondly, combining Figures 1 to 4 The embodiments shown illustrate the technical solution of this utility model:

[0044] This utility model provides an adjustable flux nozzle for a solid rocket motor, such as... Figures 1 to 4 As shown, it includes:

[0045] Nozzle housing 1;

[0046] The throat liner is coaxially installed inside the nozzle housing 1, and a flow passage 12 is provided between the throat liner and the nozzle housing 1;

[0047] An opening and closing mechanism is provided in the flow channel 12 to control the flow rate of the flow channel 12.

[0048] In some embodiments, the throat liner can be an integrally formed combination of the support member 2 and the tube body 6, coaxially disposed within the inner cavity of the nozzle housing 1, thus automatically forming the flow channel 12 between adjacent support members 2; alternatively, it can be an inner liner with a certain thickness, coaxially disposed within the inner cavity of the nozzle housing 1, with flow grooves, i.e., flow channels 12, evenly formed circumferentially on the outer wall of the inner liner, thereby also achieving the purpose of changing the flux. In this embodiment, the second option, i.e., forming flow grooves, is preferred.

[0049] The opening and closing mechanism can be of various types. For example, an intake regulating valve can be installed at the inlet of the flow channel 12, and the intake flow can be adjusted by controlling the opening degree of the valve; alternatively, a slider 3 can be installed inside the flow channel 12, and the radial sliding of the slider 3 can achieve the effect of closing and opening, thereby controlling the flow rate. In this embodiment, the radial sliding of the slider 3 is preferred to control the flow rate.

[0050] The adjustable flux nozzle for solid rocket motors provided in this embodiment of the invention improves upon the traditional constant flux nozzle by creating a nozzle capable of adjusting the throat flux. This effectively solves the problem of limited applicability caused by the constant throat flux in existing solid rocket motor nozzles. Specifically:

[0051] By creating a flow channel 12 between the nozzle housing 1 and the throat liner, the flow rate of the flow channel 12 is increased in addition to the flow rate of the throat liner, thus increasing the overall flow rate of the nozzle throat. By placing the opening and closing mechanism at the flow channel 12, the additional flow rate can be controlled to adapt to different application scenarios.

[0052] According to the adjustable flow nozzle provided by this utility model, such as Figure 3 and Figure 4 As shown, the nozzle housing 1 includes an air intake section 9, a throat section 10, and an air jet section 11, with a throat liner disposed in the throat section 10;

[0053] The throat liner includes a tube body 6 and multiple support members 2. The multiple support members 2 are arranged in a ring around the axis of the tube body 6 on the outer wall of the tube body 6 and are fixedly connected to the inner wall of the nozzle housing 1.

[0054] A flow channel 12 is formed between adjacent support members 2.

[0055] In this embodiment, the throat liner is preferably a combination of a tube body 6 and multiple support members 2. This can be achieved by casting a cylindrical tube body 6 and multiple support members 2 with fan-shaped cross-sections, forming a single piece without the need for axial flow grooves, thus facilitating manufacturing and installation. Of course, the length of the throat liner tube body 6 only needs to cover the throat section 10.

[0056] According to the adjustable flow nozzle provided by this utility model, such as Figure 3 and Figure 4 As shown, corresponding to the flow channel 12, the nozzle housing 1 has a receiving cavity 7;

[0057] The opening and closing mechanism includes:

[0058] Telescopic mechanism;

[0059] The slider 3 is connected to the telescopic mechanism and is located within the flow channel 12. It can reciprocate along the radial direction of the flow channel 12 as the telescopic mechanism extends and retracts.

[0060] Among them, the telescopic mechanism and part of the slider 3 are located in the accommodating cavity 7, and the other part of the slider 3 is located in the flow channel 12;

[0061] When slider 3 contacts the outer wall of tube 6, slider 3 and tube 6 can fit together completely.

[0062] In this embodiment, the opening and closing mechanism is preferably a combination of a telescopic mechanism and a slider 3, and the slider 3 must have its sliding space. For this purpose, a receiving cavity 7 is provided on the inner wall of the nozzle housing 1 corresponding to the flow channel 12, which can accommodate the entire slider 3.

[0063] By selecting the combination of telescopic mechanism and slider 3, the flow rate can be controlled within a large flow range. Compared with the air intake regulating valve, its air intake volume is large and can meet the air intake requirements of the nozzle.

[0064] The telescopic mechanism can be a rack and pinion telescopic mechanism, a ball screw telescopic mechanism, or an electric push rod telescopic mechanism, as long as it can realize the reciprocating motion of the slider 3 in the radial direction.

[0065] According to the adjustable flow nozzle provided by this utility model, such as Figure 2 As shown, the telescopic mechanism includes:

[0066] Drive motor 4;

[0067] The electric telescopic pole body 8 is connected to the drive motor 4 and is used to perform telescopic movement under the drive of the drive motor 4.

[0068] In this embodiment, the telescopic mechanism is preferably an electric push rod type telescopic mechanism, which has the advantages of small size, convenient installation, and no need for additional assembly, making it suitable for small and medium-sized equipment; the drive motor 4 is preferably a servo motor, and in this embodiment, there are a total of four servo motors, each paired with one of the four electric telescopic rod bodies 8, thus forming four sets of electric push rod type telescopic mechanisms. Adjacent sets form a 90° angle.

[0069] Under normal circumstances, the controller controls four servo motors to rotate synchronously to ensure uniform air intake; under special circumstances, only one or two servo motors can be controlled to rotate.

[0070] According to the adjustable flow nozzle provided by this utility model, such as Figure 2 As shown, the drive motor 4 is installed on the outer wall of the nozzle housing 1. One end of the electric telescopic rod body 8 is connected to the drive motor 4, and the other end passes through the nozzle housing 1 and extends into the receiving cavity 7 to be connected to the slider 3.

[0071] In this embodiment, the drive motor 4 is mounted on the outer wall of the nozzle housing 1 via the motor mounting bracket 5, while the electric telescopic rod body 8 is mostly located within the receiving cavity 7. This saves most of the space within the receiving cavity 7, allowing the slider 3 to have more sliding space. It also makes motor maintenance and installation more convenient.

[0072] According to the adjustable flow nozzle provided by this utility model, such as Figure 4 As shown, there are multiple flow channels 12, all of which are evenly arranged in a ring along the circumference of the throat liner.

[0073] Accordingly, there are multiple sliders 3, which are respectively disposed in multiple flow channels 12. The side of the slider 3 near the tube body 6 has a concave arc surface, which can fit against the outer wall of the tube body 6.

[0074] In this embodiment, there are four flow channels 12, which are evenly arranged in a ring, meaning that the included angle between adjacent flow channels 12 is 90°. Correspondingly, there are also four sliders 3. The slider 3 has a "C" shaped structure, with a concave arc surface on the side near the tube body 6. In the closed state, the concave arc surface can fit against the outer wall of the tube body 6. In this way, the flow channels 12 can be completely closed, preventing air leakage.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An adjustable-flow nozzle for a solid rocket motor, characterized in that, include: Nozzle housing; The throat liner is coaxially mounted inside the nozzle housing, and a flow passage is provided between the throat liner and the nozzle housing; An opening and closing mechanism is provided in the flow channel for controlling the flow rate of the flow channel.

2. The adjustable flow nozzle according to claim 1, characterized in that, The nozzle housing includes an air inlet section, a throat section, and an air jet section, with the throat liner disposed in the throat section; The throat liner includes a tube body and multiple support members. The multiple support members are arranged in a ring around the axis of the tube body on the outer wall of the tube body and are fixedly connected to the inner wall of the nozzle housing. The flow channel is formed between adjacent support members.

3. The adjustable flow nozzle according to claim 2, characterized in that, Corresponding to the flow channel, the nozzle housing has a receiving cavity; The opening and closing mechanism includes: Telescopic mechanism; The slider is connected to the telescopic mechanism and is located within the flow channel. It can reciprocate along the radial direction of the flow channel as the telescopic mechanism extends and retracts. The telescopic mechanism and part of the slider are located within the accommodating cavity, while the other part of the slider is located within the flow channel. When the slider comes into contact with the outer wall of the tube, the slider and the tube can fit together completely.

4. The adjustable flow nozzle according to claim 3, characterized in that, The telescopic mechanism includes: Drive motor; The electric telescopic pole body is connected to the drive motor and is used to perform telescopic movement under the drive of the drive motor.

5. The adjustable flow nozzle according to claim 4, characterized in that, The drive motor is installed on the outer wall of the nozzle housing. One end of the electric telescopic rod body is connected to the drive motor, and the other end passes through the nozzle housing and extends into the accommodating cavity to be connected to the slider.

6. The adjustable flow nozzle according to claim 3, characterized in that, The flow channels are multiple and are all arranged in a ring shape with equal circumference along the throat liner. Accordingly, there are multiple sliders, each disposed in one of the multiple flow channels. The side of the slider closest to the tube has a concave arc surface, which can fit against the outer wall of the tube.

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