Rocket engine ignition device comprising spark plug and exciter and liquid rocket engine

Abstract

The utility model relates to a rocket engine ignition device comprising a spark plug and an exciter and a liquid rocket engine. The rocket engine ignition device comprises a first shell, an exciter low-voltage output cable, a connecting mechanism and a sealing mechanism. The spark plug is installed on the first shell, and the two ends of the spark plug are located inside and outside the first shell respectively. One end of the spark plug located outside the first shell is located in a combustion chamber of the rocket engine; the high-voltage end of the exciter is located in the first shell, one end of the exciter low-voltage output cable is located in the first shell and electrically connected with the high-voltage end of the exciter, and the other end of the exciter low-voltage output cable is electrically connected with the low-voltage end of the exciter. The high-voltage end of the exciter is electrically connected with the spark plug; the first shell is filled with insulating glue so as to carry out glue sealing on parts in the first shell. According to the utility model, condensed water can be prevented from entering between the spark plug and the exciter, outward electric leakage of the spark plug and the exciter is avoided, and the possibility of damage to the spark plug and the exciter is reduced.

Description

Technical Field

[0001] This utility model relates to the field of rocket engine technology, and in particular to a rocket engine ignition device including a spark plug and an exciter, and a liquid rocket engine. Background Technology

[0002] A rocket engine is a power unit that generates reaction thrust through high-speed jets to propel a rocket. Its core principle is based on Newton's third law. A rocket engine burns propellant in its combustion chamber, converting it into a high-speed gas stream. This gas expands through the engine's nozzle and is then expelled, generating tremendous thrust that powers the rocket.

[0003] When non-self-igniting propellants (such as cryogenic propellants like liquid oxygen-liquid hydrogen propellant, liquid oxygen-kerosene propellant, and liquid oxygen-methane propellant) are burned in the combustion chamber, additional energy or working fluid is needed to ignite them so that they can burn, since they cannot spontaneously combust.

[0004] Currently, the common method for burning non-self-igniting propellants in the combustion chamber is to install a spark plug and an actuator on the combustion chamber. The actuator converts low-voltage current into high-voltage current of thousands or even tens of thousands of volts and transmits it to the spark plug. The spark plug conducts the high-voltage current and breaks down the air between its electrodes to form a high-temperature electric spark, thereby igniting the non-self-igniting propellant in the combustion chamber.

[0005] However, rocket engines operate in extremely harsh environments. For example, when a rocket engine operates within the atmosphere, the water vapor in the air is easily affected by the low-temperature environment created by the cryogenic propellant, causing condensation to form on the engine surface. If this condensation gets between the spark plug and the exciter, it will cause the high-voltage electrical insulation to fail, preventing the release of an electric spark at the designated location and thus preventing the ignition of the non-self-igniting propellant in the combustion chamber.

[0006] For example, when a rocket flies out of the atmosphere, that is, when the rocket engine is working outside the atmosphere, the high-voltage cable and its connector between the spark plug and the exciter are in a vacuum low-pressure environment. At this time, the current inside the spark plug and the exciter will easily leak out in the form of corona discharge, and cannot release an electric spark at the designated location, thus failing to ignite the non-self-igniting propellant in the combustion chamber.

[0007] In addition, because rocket engines generate a lot of vibration when they are working, traditional spark plugs and electrical components in the exciter are very easy to be damaged by the vibration, thus failing to ignite the non-self-igniting propellant in the combustion chamber.

[0008] Therefore, how to prevent condensate from entering between the spark plug and the actuator, prevent the current inside the spark plug and actuator from leaking out in the form of corona discharge, and reduce the possibility of damage to the electrical components inside the spark plug and actuator have become urgent problems to be solved. Utility Model Content

[0009] The purpose of this invention is to provide a rocket engine ignition device and a liquid rocket engine that include a spark plug and an exciter, in order to solve the problems existing in the prior art.

[0010] To achieve the above objectives, this utility model provides the following solution:

[0011] A first aspect of this utility model provides a rocket engine ignition device comprising a spark plug and an exciter, including a first housing, an exciter low-voltage output cable, a connecting mechanism, and a sealing mechanism, wherein:

[0012] The spark plug is mounted on the first housing, and the two ends of the spark plug are located inside the first housing and outside the first housing, respectively.

[0013] The connecting mechanism is mounted on the first housing and is used to connect the first housing to the combustion chamber of the rocket engine; one end of the spark plug located outside the first housing is located inside the combustion chamber of the rocket engine;

[0014] The sealing mechanism is installed on the first housing and is correspondingly arranged with the spark plug. The sealing mechanism is used to seal and isolate the spark plug located outside the first housing from the outside.

[0015] The high-voltage terminal of the actuator is located inside the first housing. One end of the low-voltage output cable of the actuator is located inside the first housing and is electrically connected to the high-voltage terminal of the actuator. The other end of the low-voltage output cable of the actuator is electrically connected to the low-voltage terminal of the actuator. The high-voltage terminal of the actuator is electrically connected to the spark plug.

[0016] The interior of the first housing is filled with insulating adhesive for sealing the components inside the first housing.

[0017] According to one embodiment of the present invention, the end of the first housing away from the spark plug is an open structure, and a top cover is installed at the open structure of the first housing.

[0018] According to one embodiment of the present invention, the spark plug includes an insulating sleeve, a spark plug mounting hole is provided on the first housing, the insulating sleeve is installed in the spark plug mounting hole and connected to the inner wall of the spark plug mounting hole, and the sealing mechanism is provided corresponding to the spark plug mounting hole;

[0019] An electrode rod is installed inside the insulating sleeve. The two ends of the electrode rod are located inside the first housing and outside the first housing, respectively. The high-voltage end of the exciter is electrically connected to one end of the electrode rod located inside the first housing, and the other end of the electrode rod located outside the first housing is located in the combustion chamber of the rocket engine.

[0020] According to one embodiment of the present invention, the electrode rod has a thread on one end inside the first housing, and an end cap is installed on the thread of the electrode rod, with the end of the end cap near the insulating sleeve abutting against the insulating sleeve.

[0021] According to one embodiment of the present invention, the exciter includes a boost circuit board installed inside the first housing, the boost circuit board being electrically connected to one end of the electrode rod located inside the first housing and one end of the low-voltage output cable of the exciter.

[0022] The other end of the low-voltage output cable of the exciter is equipped with a second housing, and a current sensor circuit board is installed inside the second housing. The current sensor circuit board is electrically connected to the other end of the low-voltage output cable of the exciter.

[0023] A low-voltage electrical connector is installed at one end of the second housing away from the low-voltage output cable of the exciter. The low-voltage electrical connector is electrically connected to the current sensor circuit board and is used to supply power to the current sensor circuit board.

[0024] According to one embodiment of the present invention, the connecting mechanism includes a connecting post mounted on the first housing, the end of which is used to connect to the combustion chamber of the rocket engine.

[0025] According to one embodiment of the present invention, both ends of the connecting post are provided with threads. The end of the connecting post closer to the first housing is threadedly connected to the first housing, and the end of the connecting post away from the first housing is threadedly connected to the combustion chamber of the rocket engine.

[0026] According to one embodiment of the present invention, the sealing mechanism includes a sealing tenon installed on the first housing. The sealing tenon is an annular structure. The spark plug mounting hole is located inside the inner ring of the sealing tenon. The end of the sealing tenon away from the first housing abuts against the outer wall of the combustion chamber of the rocket engine to seal and isolate the spark plug located outside the first housing from the outside.

[0027] According to one embodiment of the present invention, an installation sleeve is installed on the outer wall of the first housing. The installation sleeve is located inside the inner ring of the sealing tenon and is correspondingly arranged with respect to the spark plug mounting hole. The insulating sleeve is installed inside the installation sleeve and is connected to the inner wall of the installation sleeve.

[0028] A second aspect of this invention provides a liquid rocket engine comprising the aforementioned rocket engine ignition device including a spark plug and an exciter.

[0029] This utility model has at least the following technical effects:

[0030] First, by integrating the high-voltage end of the exciter and the spark plug together in the first housing, and by encapsulating the first housing with insulating glue, the condensate on the engine surface can be prevented from entering between the spark plug and the exciter, thus preventing the insulation of the high-voltage electricity from failing. This allows the spark plug to release an electric spark at the designated position, ensuring the normal operation of the propellant ignition.

[0031] Secondly, by integrating the high-voltage end of the exciter and the spark plug together in the first housing and by encapsulating the first housing with insulating glue, this invention can prevent the current inside the spark plug and exciter from leaking out in the form of corona discharge, and can ensure that the spark plug releases an electric spark at a designated position, thus ensuring the normal operation of the propellant ignition.

[0032] Finally, by encapsulating the first housing with insulating glue, this invention can also firmly fix the electrical components inside the first housing, thereby preventing damage to the spark plug and the electrical components inside the exciter under vibration, and ensuring the normal operation of the propellant ignition. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0035] Figure 2 for Figure 1 A schematic diagram of the overall structure from another angle;

[0036] Figure 3 for Figure 1 A sectional view;

[0037] Figure 4 This is a schematic diagram of the overall structure inside the first housing in this utility model;

[0038] Figure 5 This is a schematic diagram of the overall structure of the first shell in this utility model;

[0039] Figure 6 for Figure 5 A schematic diagram of the overall structure from another angle;

[0040] Figure 7 This is a schematic diagram of the overall structure of the spark plug in this utility model;

[0041] Figure 8 for Figure 7 A schematic diagram of the overall structure from another angle;

[0042] Figure 9 This is a schematic diagram of the overall structure of the second housing and the low-voltage electrical connector in this utility model;

[0043] The components include: 1. First housing; 2. Top cover; 3. Connecting post; 4. Sealing tenon; 5. Insulating sleeve; 6. Mounting sleeve; 7. Electrode rod; 8. End cap; 9. Exciter low-voltage output cable; 10. Boost circuit board; 11. Second housing; 12. Current sensor circuit board; 13. Low-voltage electrical connector. Detailed Implementation

[0044] The features and exemplary embodiments of various aspects of this utility model will be described in detail below. To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain this utility model and to exemplarily illustrate the principles of this utility model, and are not configured to limit this utility model. In addition, the structural components in the drawings are not necessarily drawn to scale. For example, the dimensions of some structural components or regions in the drawings may be enlarged for other structural components or regions to aid in the understanding of the embodiments of this utility model.

[0045] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of the embodiments of this utility model. In the description of this utility model, it should be noted that, unless otherwise stated, 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 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 this utility model according to the specific circumstances.

[0046] Furthermore, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a structure or component that includes a list of elements includes not only those elements but also other structural elements that are not expressly listed or inherent to the structure or component. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the article or apparatus that includes the element.

[0047] Spatial relation terms such as "below," "under," "under," "low," "above," "on," and "high" are used for descriptive convenience to explain the positioning of one element relative to a second element, indicating that these terms are intended to cover different orientations of the device, in addition to those different from those shown in the figure. Furthermore, phrases such as "one element on / below another element" can indicate that two elements are in direct contact, or that there are other elements between the two elements. In addition, terms such as "first" and "second" are also used to describe individual elements, areas, parts, etc., without specifically indicating order or sequence, and should not be considered restrictive. Similar terms are used throughout the description to represent similar elements.

[0048] For those skilled in the art, this invention can be implemented without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the invention by illustrating examples.

[0049] Unless otherwise stated, any circuit board mentioned in this utility model is known in the art, that is, those skilled in the art are familiar with the specific circuit board structure, the connection method between the circuit board and other components, and how the circuit board achieves the corresponding functions (including but not limited to supporting, connecting, transmitting signals, protecting components, improving integration, etc.).

[0050] Reference Figures 1-3 This utility model provides a rocket engine ignition device including a spark plug and an exciter, comprising a first housing 1, an exciter low-voltage output cable 9, a connecting mechanism, and a sealing mechanism, wherein:

[0051] The spark plug is installed on the first housing 1, and the two ends of the spark plug are located inside the first housing 1 and outside the first housing 1, respectively.

[0052] In this embodiment, refer to Figures 1-6 The first shell 1 can be a cuboid structure.

[0053] In this embodiment, refer to Figures 1-3 The spark plug can be installed at the bottom end of the first housing 1. Preferably, refer to... Figures 1-2 The spark plug can be installed at the center of the bottom end of the first housing 1.

[0054] According to one embodiment of the present invention, referring to Figures 1-3 A connecting mechanism is mounted on the first housing 1, and the connecting mechanism is used to connect the first housing 1 to the combustion chamber (not shown) of a rocket engine (e.g., a liquid rocket engine). One end of the spark plug located outside the first housing 1 is located inside the combustion chamber of the rocket engine.

[0055] In this embodiment, a combustion chamber through-hole may be provided on the combustion chamber of the rocket engine, through which one end of the spark plug located outside the first housing 1 extends into the combustion chamber of the rocket engine. The combustion chamber of the rocket engine is prior art known in the art and will not be described in detail here.

[0056] In this embodiment, refer to Figures 1-2 The number of connecting mechanisms can preferably be four, all of which are installed at the bottom of the first housing 1, and the four connecting mechanisms can be arranged sequentially at the four included corners of the bottom of the first housing 1.

[0057] In this embodiment, refer to Figures 1-2 The four edges of the first shell 1 are all chamfered.

[0058] According to one embodiment of the present invention, a sealing mechanism is installed on the first housing 1, and the sealing mechanism is correspondingly arranged with the spark plug. The sealing mechanism is used to seal and isolate the spark plug located outside the first housing 1 from the outside.

[0059] In this embodiment, refer to Figures 1-3 The sealing mechanism is mounted on the outer wall at the bottom end of the first housing 1. The connection between the sealing mechanism and the first housing 1 can be achieved by using a substance known in the art, such as an adhesive, to bond the sealing mechanism to the first housing 1. Alternatively, the sealing mechanism and the first housing 1 can be integrally formed.

[0060] In this embodiment, the sealing mechanism can seal and isolate one end of the spark plug located outside the first housing 1 (i.e., one end of the spark plug extending into the combustion chamber of the rocket engine through the combustion chamber through hole) from the external environment, thereby preventing water vapor or dust in the external environment from affecting the normal operation of the spark plug located in the combustion chamber of the rocket engine, thus ensuring the smooth combustion of the propellant.

[0061] According to one embodiment of the present invention, referring to Figure 3 The high-voltage end of the actuator is located inside the first housing 1. One end of the low-voltage output cable 9 of the actuator is located inside the first housing 1 and is electrically connected to the high-voltage end of the actuator. The other end of the low-voltage output cable 9 of the actuator is electrically connected to the low-voltage end of the actuator. The high-voltage end of the actuator is electrically connected to the spark plug.

[0062] In this embodiment, the shape of the low-voltage output cable 9 of the exciter is not particularly limited, and it can be a cylindrical structure known in the art.

[0063] In this embodiment, the length of the low-voltage output cable 9 of the exciter is not particularly limited, and those skilled in the art can adjust the length of the low-voltage output cable 9 of the exciter according to the actual situation.

[0064] In this embodiment, the low-voltage terminal of the actuator and the low-voltage output cable 9 of the actuator can be installed by using a substance known in the art, such as an adhesive, to bond the low-voltage terminal of the actuator to the low-voltage output cable 9. The low-voltage output cable 9 is prior art known in the art and will not be described in detail here.

[0065] In this embodiment, refer to Figure 3 The left end of the low-voltage output cable 9 of the actuator can penetrate through the side wall of the first housing 1 and extend into the first housing 1, thereby making an electrical connection with the high-voltage end of the actuator located inside the first housing 1. The connection between the low-voltage output cable 9 of the actuator and the first housing 1 can be provided with a sealing layer known in the art, such as silicone material known in the art, to effectively seal the connection between the low-voltage output cable 9 of the actuator and the first housing 1; no particular limitation is made here.

[0066] In this embodiment, refer to Figure 3 The high-voltage end of the exciter can be electrically connected to the top of the spark plug via a high-voltage wire (not shown in the figure) known in the art.

[0067] According to one embodiment of the present invention, the interior of the first housing 1 is filled with insulating adhesive (not shown in the figure) for sealing the components inside the first housing 1 (i.e., at least one end of the spark plug and the high-voltage end of the exciter located inside the first housing 1).

[0068] In this embodiment, the insulating adhesive is a prior art known in the art, and the insulating adhesive can be any insulating adhesive that can be used in the temperature range of a rocket engine, such as an insulating adhesive using organosilicon materials, etc., and is not particularly limited here.

[0069] In this embodiment, an electrode is disposed on the inner wall of the combustion chamber of the rocket engine. For ease of description, this electrode is referred to as the combustion chamber electrode. The combustion chamber electrode is a zero-potential electrode, and the combustion chamber electrode is located at one end of the spark plug inside the combustion chamber of the rocket engine (i.e., Figure 3 The bottom of the spark plug is correspondingly located, that is, at... Figure 3 Near the bottom of the spark plug. The electrodes are existing technology known in the art and will not be described in detail here.

[0070] When it is necessary to ignite the propellant in the combustion chamber of the rocket engine, the low-pressure end of the exciter (i.e., Figure 3 The rightmost end of the actuator is connected to the power supply equipment on the rocket (known in the art), and the spark plug extends through the combustion chamber through-hole into the combustion chamber of the rocket engine. Then, the first housing 1 is installed on the outer wall of the combustion chamber of the rocket engine through a connecting mechanism. At this time, the power supply equipment on the rocket provides low-voltage DC power to the low-voltage end of the actuator, and transmits it to the high-voltage end of the actuator through the low-voltage output cable 9. The high-voltage end of the actuator converts the low-voltage DC power into high-voltage power of several thousand volts or tens of thousands of volts, and transmits it to the spark plug through the high-voltage wire. This causes a high-temperature electric spark sufficient to break down the air between the spark plug and the combustion chamber electrode, thereby igniting the propellant in the combustion chamber of the rocket engine.

[0071] In the above-mentioned working process, by integrating the high-voltage end of the exciter and the spark plug together in the first housing 1 and by setting the first housing 1 to be filled with insulating glue, this utility model can prevent condensate on the engine surface from entering between the spark plug and the exciter, thereby preventing the insulation of the high voltage electricity from failing. This allows the spark plug to release an electric spark at a designated position (i.e., between the combustion chamber electrode), thus ensuring the normal operation of the propellant ignition.

[0072] Meanwhile, by integrating the high-voltage end of the exciter and the spark plug together in the first housing 1 and by encapsulating the first housing 1 with insulating glue, this utility model can prevent the current inside the spark plug and exciter from leaking out in the form of corona discharge. This allows the spark plug to release an electric spark at a designated location (i.e., between the spark plug and the combustion chamber electrode), ensuring the normal operation of the propellant ignition.

[0073] Furthermore, by encapsulating the first housing 1 with insulating glue, this invention can also firmly fix the electrical components inside the first housing 1, thereby preventing damage to the spark plug and the electrical components inside the exciter under vibration, and ensuring the normal operation of the propellant ignition.

[0074] According to one embodiment of the present invention, referring to Figures 3-5 The end of the first housing 1 away from the spark plug is an open structure, and a top cover 2 is installed at the open structure of the first housing 1.

[0075] In this embodiment, refer to Figures 3-5 The top of the first housing 1 is an open structure, and the top cover 2 is installed on the top of the first housing 1.

[0076] In this embodiment, refer to Figure 1 and Figure 2 The top cover 2 can be a structure with the same cross-sectional shape and area as the first shell 1.

[0077] In this embodiment, refer to Figure 3 The top of the opening structure of the first housing 1 can be provided with a stepped groove, and the top cover 2 can be installed in the stepped groove, thereby being installed on the top of the first housing 1.

[0078] In this embodiment, the top cover 2 can be connected to the top of the first housing 1 by welding, a method known in the art.

[0079] In this embodiment, the top cover 2 can further ensure the sealing of the inside of the first housing 1 and further increase the isolation of the electrical components inside the first housing 1 from the external environment.

[0080] According to one embodiment of the present invention, referring to Figure 3 , Figure 7 and Figure 8 The spark plug includes an insulating sleeve 5. A spark plug mounting hole is provided on the first housing 1. The insulating sleeve 5 is installed in the spark plug mounting hole and connected to the inner wall of the spark plug mounting hole. The sealing mechanism is set correspondingly to the spark plug mounting hole.

[0081] In this embodiment, the insulating sleeve 5 can be made of ceramic materials known in the art, and is not particularly limited herein.

[0082] In this embodiment, refer to Figure 7 and Figure 8 The insulating sleeve 5 can be cylindrical in shape, and its radial thickness is greater than or equal to 3mm, which can ensure that the insulating sleeve 5 has excellent insulation and mechanical properties.

[0083] In this embodiment, the axial length of the insulating sleeve 5 at one end of the first housing 1 is greater than or equal to 10 mm to ensure a reliable distance to prevent high voltage creep.

[0084] In this embodiment, the outer wall of the insulating sleeve 5 and the inner wall of the spark plug mounting hole can be connected by brazing, a method known in the art, to ensure sufficient sealing between them. For example, the outer wall of the insulating sleeve 5 can be metallized, and then nickel-plated on the inner wall of the spark plug mounting hole to form a nickel plating layer. Finally, the insulating sleeve 5 and the spark plug mounting hole can be welded together using silver-based brazing filler metal, thereby completing the brazing process.

[0085] According to one embodiment of the present invention, referring to Figure 3 An electrode rod 7 is installed inside the insulating sleeve 5, with its two ends located inside and outside the first housing 1, respectively. The high-voltage end of the exciter is connected to one end of the electrode rod 7 located inside the first housing 1 (i.e., Figure 3 The top end of the middle electrode rod 7 is electrically connected to the end of the electrode rod 7 located outside the first housing 1 (i.e., Figure 3 The bottom end of the intermediate electrode rod 7 is located in the combustion chamber of the rocket engine.

[0086] In this embodiment, the electrode rod 7 is a metal material known in the art, and refers to... Figure 7 and Figure 8 The electrode rod 7 can be a cylindrical structure.

[0087] Furthermore, since the discharge between the electrode rod 7 and the combustion chamber electrode is a gas gap discharge (i.e., a discharge that breaks down the air), different discharge voltages and spark energies can be set. For example, the electrode rod 7 can be made of semiconductor material (known in the art). Since semiconductors have very low resistance, this method can reduce the output voltage of the exciter to a certain extent, further reducing the technical difficulty of high-voltage insulation.

[0088] In this embodiment, the electrode rod 7 and the insulating sleeve 5 can also be connected by brazing, a method known in the art.

[0089] In this embodiment, refer to Figure 3 The high-voltage end of the exciter is electrically connected to the top of the electrode rod 7 via a high-voltage wire.

[0090] According to one embodiment of the present invention, referring to Figure 3 The electrode rod 7 is located at one end inside the first housing 1 (i.e. Figure 3 The top of the electrode rod 7 is provided with a thread (not shown in the figure), and an end cap 8 is installed on the thread of the electrode rod 7. The end cap 8 near the insulating sleeve 5 abuts against the insulating sleeve 5.

[0091] In this embodiment, refer to Figure 7 and Figure 8 The end cap 8 can be a structure with a convex vertical cross-section.

[0092] In this embodiment, a threaded hole corresponding to the thread on the electrode rod 7 is formed at the center of the end cap 8 along its axial direction, so that the end cap 8 can be installed by the thread. Figure 3 The top of the middle electrode rod 7.

[0093] In one embodiment of this utility model, the end cap 8 can limit the electrode rod 7 in the axial direction of the insulating sleeve 5, thereby further ensuring the firmness of the connection between the electrode rod 7 and the insulating sleeve 5.

[0094] In this embodiment, the electrode rod 7 located above the end cap 8 can be threaded with a nut (not shown in the figure), and this nut is used to press the high-voltage wire, thereby making the electrode rod 7 electrically connected to the high-voltage end of the exciter through the high-voltage wire.

[0095] Furthermore, the nut described above may not be a standard nut shape. For example, the end of the nut near the insulating sleeve 5 may be attached to the side wall of the insulating sleeve 5 (i.e., Figure 3 The electrode rod 7 is confined within the insulating sleeve 5 by the side wall of the insulating sleeve 5, thereby further ensuring the strong connection between the electrode rod 7 and the insulating sleeve 5.

[0096] According to one embodiment of the present invention, referring to Figure 3 and Figure 4 The actuator includes a boost circuit board 10 installed inside the first housing 1. The boost circuit board 10 is connected to one end of the electrode rod 7 located inside the first housing 1 (i.e., Figure 3 The top end of the middle electrode rod 7 and one end of the low-voltage output cable 9 of the exciter (i.e., the end of the low-voltage output cable 9 of the exciter located inside the first housing 1) are electrically connected (not shown in the figure).

[0097] In this embodiment, although the exciter low-voltage output cable 9 is called "low-voltage output cable", it is also the "low-voltage input cable" of the boost circuit board 10. Therefore, those skilled in the art cannot limit the working mode of the exciter low-voltage output cable 9 based solely on the name "low-voltage output cable". That is, the exciter low-voltage output cable 9 can simultaneously serve as the exciter's "low-voltage output cable" and the boost circuit board 10's "low-voltage input cable".

[0098] In this embodiment, the boost circuit board 10 can be electrically connected to one end of the electrode rod 7 located inside the first housing 1 via a high-voltage wire (not shown in the figure and known in the art).

[0099] In this embodiment, refer to Figure 3 and Figure 4 The number of boost circuit boards 10 can be two, symmetrically arranged inside the first housing 1. The boost circuit board 10 can convert low-voltage current into high-voltage current, temporarily store the high-voltage current within itself, and also transmit the high-voltage current to the electrode rod 7. The above are all prior art known in the art and will not be elaborated further here.

[0100] According to one embodiment of the present invention, referring to Figures 1-3 The other end of the low-voltage output cable 9 of the exciter (i.e. Figure 3 The right end of the low-voltage output cable 9 of the intermediate exciter is fitted with a second housing 11.

[0101] In this embodiment, the other end of the low-voltage output cable 9 of the exciter can pass through the second housing 11 and extend into the interior of the second housing 11. The connection between the low-voltage output cable 9 of the exciter and the second housing 11 can be achieved by using a method known in the art, such as using an adhesive to bond the low-voltage output cable 9 of the exciter to the second housing 11, thereby realizing the connection between the low-voltage output cable 9 of the exciter and the second housing 11. No particular limitation is made here.

[0102] According to one embodiment of the present invention, referring to Figure 3 The second housing 11 houses a current sensor circuit board 12, which is connected to the other end of the low-voltage output cable 9 of the exciter (i.e., Figure 3 Electrical connection (right end of the low-voltage output cable 9 of the exciter).

[0103] In this embodiment, refer to Figure 3 The current sensor circuit board 12 can be mounted horizontally inside the second housing 11. The current sensor circuit board 12 can be connected to the second housing 11 in a manner known in the art, such as by bolts, without particular limitation.

[0104] According to one embodiment of the present invention, referring to Figures 1-3 The end of the second housing 11 furthest from the low-voltage output cable 9 of the actuator (i.e. Figure 3 A low-voltage electrical connector 13 is installed at the right end of the second housing 11. The low-voltage electrical connector 13 is electrically connected to the current sensor circuit board 12 and can be used to power the current sensor circuit board 12.

[0105] In this embodiment, refer to Figures 1-3 or Figure 9 The second shell 11 can be a cylindrical structure.

[0106] In this embodiment, the low-voltage connector 13 and the current sensor circuit board 12 can be electrically connected via low-voltage wires known in the art.

[0107] In this embodiment, the low-voltage electrical connector 13 can be connected to the power supply equipment on the rocket to supply power to the current sensor circuit board 12.

[0108] In this embodiment, the current sensor circuit board 12 can monitor the current transmitted to it in real time and transmit the monitored current to the rocket's measurement system in real time, so that personnel can monitor the operating status of the exciter in real time. For example, seven wires (known in the art) are connected to the input terminal of the current sensor circuit board 12. Four of these wires are used to transmit the low-voltage current from the power supply equipment on the rocket to the current sensor circuit board 12, while the other three wires can transmit the current monitored by the current sensor circuit board 12 to the rocket's measurement system in real time, so that personnel can monitor the operating status of the exciter in real time. Both the current sensor circuit board 12 and the rocket's measurement system are existing technologies known in the art and will not be described in detail here.

[0109] According to one embodiment of the present invention, the connecting mechanism includes a connecting post 3 mounted on a first housing 1, the end of which is used to connect to the combustion chamber of a rocket engine. Preferably, both ends of the connecting post 3 are provided with threads (not shown in the figure), the end of the connecting post 3 near the first housing 1 is threadedly connected to the first housing 1, and the end of the connecting post 3 away from the first housing 1 is threadedly connected to the combustion chamber of the rocket engine.

[0110] In this embodiment, refer to Figure 1 and Figure 2 The connecting column 3 can be a cylindrical structure.

[0111] In this embodiment, refer to Figure 6 The bottom end of the first housing 1 has four threaded holes. One end of each of the four connecting posts 3 is sequentially threaded into the four threaded holes at the bottom end of the first housing 1 to connect with the first housing 1. Four threaded holes are also provided on the outer wall of the rocket engine's combustion chamber. The other ends of each of the four connecting posts 3 are sequentially threaded into the four threaded holes on the outer wall of the combustion chamber to connect with the rocket engine's combustion chamber, thereby mounting the first housing 1 onto the rocket engine's combustion chamber.

[0112] According to one embodiment of the present invention, referring to Figures 1-3 and Figure 6The sealing mechanism includes a sealing tenon 4 mounted on the first housing 1, and the sealing tenon 4 has an annular structure. Preferably, the sealing tenon 4 has a perfectly circular ring structure. The spark plug mounting hole is located inside the inner ring of the sealing tenon 4, and the end of the sealing tenon 4 away from the first housing 1 abuts against the outer wall of the rocket engine's combustion chamber to seal and isolate the spark plug located outside the first housing 1 from the outside environment.

[0113] In this embodiment, refer to Figures 1-3 and Figure 6 The sealing tenon 4 can be bonded to the first housing 1 using a substance known in the art, such as an adhesive, thereby achieving the connection between the sealing tenon 4 and the first housing 1. Alternatively, the sealing tenon 4 and the first housing 1 can be integrally formed.

[0114] In this embodiment, an annular groove corresponding to the sealing tenon 4 can be formed on the outer wall of the rocket engine's combustion chamber, and the combustion chamber through hole is located inside the inner ring of the annular groove. When the first housing 1 is installed on the rocket engine's combustion chamber, the sealing tenon 4 and the annular groove will form a labyrinth structure (i.e., the sealing tenon 4 fits in the annular groove), thereby sealing and isolating the spark plug outside the first housing 1 from the outside world.

[0115] According to one embodiment of the present invention, referring to Figures 1-3 and Figure 6 An installation sleeve 6 is installed on the outer wall of the first housing 1. The installation sleeve 6 is located inside the inner ring of the sealing tenon 4 and is set in accordance with the spark plug mounting hole. An insulating sleeve 5 is installed inside the installation sleeve 6 and is connected to the inner wall of the installation sleeve 6.

[0116] In this embodiment, refer to Figures 1-3 and Figure 6 The mounting sleeve 6 can be a cylindrical structure.

[0117] In this embodiment, refer to Figures 1-3 and Figure 6 The mounting sleeve 6 can be installed at the edge of the spark plug mounting hole to form a unified communication structure with the spark plug mounting hole.

[0118] In this embodiment, the inner wall of the mounting sleeve 6 and the outer wall of the insulating sleeve 5 can also be connected by brazing.

[0119] By installing the sleeve 6, the insulating sleeve 5 can be installed more securely on the first housing 1.

[0120] This embodiment further provides a liquid rocket engine. Those skilled in the art should understand that any liquid rocket engine using this device is within the protection scope of this utility model.

[0121] The above embodiments of this utility model can be combined with each other and have corresponding technical effects.

[0122] 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. A rocket engine ignition device comprising a spark plug and an exciter, characterized in that, Includes a first housing (1), an exciter low-voltage output cable (9), a connecting mechanism, and a sealing mechanism, wherein: The spark plug is installed on the first housing (1), and the two ends of the spark plug are located inside the first housing (1) and outside the first housing (1), respectively; The connecting mechanism is installed on the first housing (1) and is used to connect the first housing (1) to the combustion chamber of the rocket engine; one end of the spark plug located outside the first housing (1) is located inside the combustion chamber of the rocket engine; The sealing mechanism is installed on the first housing (1) and is correspondingly provided with the spark plug. The sealing mechanism is used to seal and isolate the spark plug located outside the first housing (1) from the outside. The high-voltage end of the actuator is located inside the first housing (1), one end of the low-voltage output cable (9) of the actuator is located inside the first housing (1) and electrically connected to the high-voltage end of the actuator, and the other end of the low-voltage output cable (9) of the actuator is electrically connected to the low-voltage end of the actuator; the high-voltage end of the actuator is electrically connected to the spark plug; The interior of the first housing (1) is filled with insulating glue for sealing the components inside the first housing (1).

2. The rocket engine ignition device comprising a spark plug and an exciter according to claim 1, characterized in that, The first housing (1) has an open structure at one end away from the spark plug, and a top cover (2) is installed at the open structure of the first housing (1).

3. The rocket engine ignition device comprising a spark plug and an exciter according to claim 1, characterized in that, The spark plug includes an insulating sleeve (5), and a spark plug mounting hole is provided on the first housing (1). The insulating sleeve (5) is installed in the spark plug mounting hole and connected to the inner wall of the spark plug mounting hole. The sealing mechanism is provided corresponding to the spark plug mounting hole. An electrode rod (7) is installed inside the insulating sleeve (5). The two ends of the electrode rod (7) are located inside the first housing (1) and outside the first housing (1), respectively. The high-voltage end of the exciter is electrically connected to one end of the electrode rod (7) located inside the first housing (1), and the other end of the electrode rod (7) located outside the first housing (1) is located in the combustion chamber of the rocket engine.

4. The rocket engine ignition device comprising a spark plug and an exciter according to claim 3, characterized in that, The electrode rod (7) has a thread on one end inside the first housing (1), and an end cap (8) is installed on the thread of the electrode rod (7). The end cap (8) near the insulating sleeve (5) abuts against the insulating sleeve (5).

5. The rocket engine ignition device comprising a spark plug and an exciter according to claim 3, characterized in that, The exciter includes a boost circuit board (10) installed inside the first housing (1), and the boost circuit board (10) is electrically connected to one end of the electrode rod (7) located inside the first housing (1) and one end of the low-voltage output cable (9) of the exciter. The other end of the low-voltage output cable (9) of the exciter is equipped with a second housing (11), and a current sensor circuit board (12) is installed inside the second housing (11). The current sensor circuit board (12) is electrically connected to the other end of the low-voltage output cable (9) of the exciter. The second housing (11) is equipped with a low-voltage electrical connector (13) at one end away from the low-voltage output cable (9) of the exciter. The low-voltage electrical connector (13) is electrically connected to the current sensor circuit board (12) and is used to supply power to the current sensor circuit board (12).

6. The rocket engine ignition device comprising a spark plug and an exciter according to claim 1, characterized in that, The connecting mechanism includes a connecting post (3) mounted on the first housing (1), the end of which is used to connect to the combustion chamber of the rocket engine.

7. The rocket engine ignition device comprising a spark plug and an exciter according to claim 6, characterized in that, Both ends of the connecting post (3) are provided with threads. The end of the connecting post (3) close to the first housing (1) is threaded to the first housing (1), and the end of the connecting post (3) away from the first housing (1) is threaded to the combustion chamber of the rocket engine.

8. The rocket engine ignition device comprising a spark plug and an exciter according to claim 3, characterized in that, The sealing mechanism includes a sealing tenon (4) installed on the first housing (1). The sealing tenon (4) is an annular structure. The spark plug mounting hole is located inside the inner ring of the sealing tenon (4). The end of the sealing tenon (4) away from the first housing (1) abuts against the outer wall of the combustion chamber of the rocket engine to seal and isolate the spark plug located outside the first housing (1) from the outside.

9. The rocket engine ignition device comprising a spark plug and an exciter according to claim 8, characterized in that, An installation sleeve (6) is installed on the outer wall of the first housing (1). The installation sleeve (6) is located inside the inner ring of the sealing tenon (4) and is correspondingly arranged with respect to the spark plug mounting hole. The insulating sleeve (5) is installed inside the installation sleeve (6) and is connected to the inner wall of the installation sleeve (6).

10. A liquid rocket engine, characterized in that, The rocket engine ignition device comprising a spark plug and an exciter as described in any one of claims 1-9.

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