Ignition device and ignition method for liquid engine

Abstract

The invention discloses a liquid engine ignition device and method. The liquid engine ignition device comprises a storage tank, an ignition tube, an exhaust one-way valve and a special-shaped shuttle valve. A storage tank piston is arranged in the storage tank and divides a storage tank cavity into a storage tank storage cavity and a storage tank air cavity; an ignition tube piston is arranged in the ignition tube, an ignition tube cavity is divided into a tube body storage cavity and an extrusion gas cavity, and the tube body storage cavity can contain an ignition agent required by ignition each time; the pipe body storage cavity inlet communicates with the storage tank storage cavity, and the pipe body storage cavity outlet communicates with the combustion chamber; during ignition, the extrusion gas source is communicated with the extrusion gas cavity through the special-shaped shuttle valve, the ignition tube piston is pushed to move, and the ignition agent in the tube body storage cavity is extruded into the combustion chamber; and in the non-ignition state, the extrusion air cavity communicates with the storage tank air cavity, the storage tank piston is pushed to move, and the pipe body storage cavity is filled with the ignition agent in the storage tank storage cavity. The engine ignition device can automatically fill the ignition agent and achieve multiple times of ignition, and is simple in structure and good in stability.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid engine ignition, and in particular to a liquid engine ignition device and an ignition method. Background Art

[0002] With the development of aerospace technology, liquid rocket recovery technology is crucial in reducing rocket launch costs. Rocket recovery technology requires the engine to be reliably ignited multiple times. At present, the main multiple ignition methods for domestic liquid rocket engines are spark ignition, gunpowder ignition, and ignition agent ignition.

[0003] The spark ignition system requires the addition of an oxidizer and fuel supply system and a special ignition structure, which makes the system complex. This problem is more prominent when a large-thrust engine is ignited multiple times.

[0004] The biggest disadvantage of gunpowder ignition is that the gunpowder slag produced by ignition may produce excess matter in the engine to clog the combustion chamber nozzle. At the same time, each igniter requires a separate mounting structure, circuit interface, etc., making the ignition device structure redundant.

[0005] Ignition agents have high ignition energy, reliable ignition and do not produce excess materials, but they are extremely prone to spontaneous combustion and have poor maintenance requirements. Domestic ignition agents are mostly used for single ignition, and there are few mature devices for multiple ignition of ignition agents.

[0006] In daily practice, it is found that the existing technical solutions have the following problems:

[0007] Currently, there are two structures for multiple ignitions: First, storage in a tank, with direct extrusion and multiple ignitions under a complex control system. This involves multiple extrusions directly within the tank, using solenoid valves to control the extrusion rate. This system places high demands on valves and suffers from poor stability in ignition delivery. Second, multiple ignition tubes are connected in parallel, resulting in a redundant and complex system structure. Neither of these structures can meet the ignition requirements of liquid engines in rocket recovery solutions.

[0008] In view of this, it is necessary to provide a new technical solution to solve the above problems. Summary of the Invention

[0009] In order to solve the above technical problems, the present application provides a liquid engine ignition device and ignition method, providing an efficient and reliable engine multiple ignition solution, an engine ignition device that can automatically fill ignition agent and realize multiple ignitions, and has a simple structure and good stability.

[0010] A liquid engine ignition device, comprising:

[0011] A storage tank; a storage tank piston is provided in the storage tank, and the storage tank piston separates the storage tank cavity into a mutually independent storage tank storage cavity and a storage tank air cavity, and the storage tank storage cavity can store the ignition agent required for multiple ignitions;

[0012] Ignition tube; an ignition tube piston is provided in the ignition tube; the ignition tube piston divides the ignition tube cavity into a mutually independent tube body storage cavity and an extrusion air cavity, the tube body storage cavity being capable of containing the ignition agent required for each ignition; the tube body storage cavity inlet is connected to the tank storage cavity through an ignition agent tube, and the tube body storage cavity outlet is connected to the combustion chamber; the ignition agent tube is provided with a feeding one-way valve that allows the fluid in the tank storage cavity to flow into the tube body storage cavity; the tube body storage cavity outlet is provided with a discharge one-way valve that controls the one-way flow of ignition agent in the tube body storage cavity to the combustion chamber;

[0013] Exhaust one-way valve; the exhaust one-way valve is connected to the air cavity of the storage tank to maintain the pressure in the air cavity of the storage tank at a preset constant value;

[0014] A special-shaped shuttle valve; the first inlet of the special-shaped shuttle valve is connected to the extrusion air source, the second inlet of the special-shaped shuttle valve is connected to the air cavity of the storage tank, and the outlet of the special-shaped shuttle valve is connected to the extrusion air cavity;

[0015] The special-shaped shuttle valve is configured to connect the extrusion gas source with the extrusion gas cavity during ignition, push the ignition tube piston to move, and squeeze the ignition agent in the tube body storage cavity into the combustion chamber; in the non-ignition state, the extrusion gas cavity is connected with the tank gas cavity, push the tank piston to move, and fill the ignition agent in the tank storage cavity into the tube body storage cavity.

[0016] Preferably, it also includes an exhaust port for extracting gas from the tube body storage cavity and the tank storage cavity before adding ignition agent; the exhaust port is connected to the tube body storage cavity; and the exhaust port is provided with an exhaust one-way valve.

[0017] Preferably, it further comprises a filling one-way valve for filling the ignition agent into the storage chamber of the storage tank; the filling one-way valve is communicated with the storage chamber of the storage tank.

[0018] Preferably, it also includes a solenoid valve for controlling the on-off of the pipeline between the extrusion gas source and the first inlet of the special-shaped shuttle valve.

[0019] Preferably, the solenoid valve is a two-position three-way solenoid valve.

[0020] Preferably, a constant tension spring is provided in the extrusion air cavity for pushing the ignition tube piston to move so that the tube body storage cavity has an expansion trend; and a constant pressure spring is provided in the storage tank air cavity for pushing the storage tank piston to move so that the storage tank storage cavity has a contraction trend.

[0021] Preferably, it also includes a tensioning tool for moving the tank piston before filling the ignition agent so that the tank storage cavity has sufficient accommodation space; a tensioning tool connection port connected to the tank air cavity is opened on the tank; the tensioning tool passes through the tensioning tool connection port and is detachably fixedly connected to the tank partition.

[0022] Preferably, the internal pressure of the ignition agent in the storage chamber of the storage tank is 1 MPa; the forward opening pressure of the special-shaped shuttle valve is 6 MPa; the opening pressure of the exhaust one-way valve is 3 MPa; the access pressure of the extrusion gas source is 5 MPa; and the opening pressure of the feeding one-way valve is 0.05 MPa.

[0023] According to another aspect of the present application, a liquid engine ignition method is provided, which uses a liquid engine ignition device to perform ignition, comprising:

[0024] S1. Open the connection port of the tightening tool to connect the air cavity of the storage tank to the atmosphere;

[0025] S2. Vacuum the tube storage cavity and the tank storage cavity through the vacuum port;

[0026] S3. After vacuuming is completed, the vacuum port is sealed;

[0027] S4. Connect the tensioning tool to the tank piston, pull the tank piston to maximize the storage chamber of the tank to store the ignition agent required for multiple ignitions, and secure the tensioning tool.

[0028] S5. Add ignition agent into the storage cavity of the tank through the filling port, and the ignition agent enters the storage cavity of the tube body through the ignition agent tube;

[0029] S6. After the added ignition agent reaches the preset mass, the tensioning fixture is removed and the interface is sealed; at this point, the ignition tube and the lower cavity of the storage tank are filled with ignition agent;

[0030] S7, open the solenoid valve, the high-pressure control gas supplied by the extrusion gas source enters the extrusion gas chamber through the special-shaped shuttle valve, the ignition tube piston moves downward, and the ignition agent in the tube body storage chamber is squeezed out through the discharge check valve at the ignition tube outlet, and enters the combustion chamber for spontaneous ignition;

[0031] S8. After one ignition is completed, the solenoid valve is closed, the extrusion gas source stops supplying high-pressure control gas to the extrusion gas cavity, and the high-pressure gas in the extrusion gas cavity flows into the storage tank gas cavity through the special-shaped shuttle valve. Under the action of the constant tension spring in the extrusion gas cavity and the constant pressure spring in the storage tank gas cavity, the ignition tube piston moves until the tube body storage cavity is in the maximum state capable of storing the ignition agent required for each ignition; during this process, the ignition agent in the storage tank storage cavity enters through the ignition agent tube and fills the tube body storage cavity, meeting the conditions for the next ignition;

[0032] Repeat steps S7 and S8 until all the multiple ignitions of the liquid engine are completed.

[0033] Compared with the prior art, this application has at least the following beneficial effects:

[0034] 1. The present invention adopts an ignition agent storage tank to store the ignition agent mass required for multiple ignitions, and the ignition tube can quantitatively store the ignition agent mass required for one ignition. A one-way valve is installed between the storage tank and the ignition tube, and automatic filling is performed through the spring force in the ignition tube and the storage tank, thereby realizing multiple ignitions. The ignition system has a simple structure, no redundancy, and good maintainability.

[0035] 2. The present invention adopts a mechanical structure to automatically complete the quantitative filling of the ignition agent in the ignition tube, which is not affected by the accuracy of the control system.

[0036] 3. The ignition device of the present invention only requires one extrusion gas source equipped with a solenoid valve to control ignition, and has a simple structure.

[0037] 4. The ignition path propulsion medium of the present invention is control gas, which does not affect the combustion efficiency of the engine.

[0038] 5. The present invention adopts a high back pressure discharge one-way valve to seal the ignition tube, which can realize multiple uses of a single ignition tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0040] Figure 1 This is a schematic diagram of the connection of components of the liquid engine ignition device of the present invention;

[0041] Figure 2 is the curve of ignition signal changing with time;

[0042] Figure 3 is the curve showing the piston displacement in the tank changing with time;

[0043] Figure 4 is the curve of the driving gas pressure of the tank changing with time;

[0044] Figure 5 is the curve of tank flow changing with time.

[0045] The above drawings include the following reference numerals:

[0046] 1. Solenoid valve; 2. Special-shaped shuttle valve; 3. Ignition tube; 4. Discharge check valve; 5. Exhaust check valve; 6. Feed check valve; 7. Storage tank; 8. Filling check valve; 9. Exhaust check valve; 10. Tensioning tooling. DETAILED DESCRIPTION

[0047] To make the purpose, technical solutions, and advantages of this application more clear, the technical solutions of this application will be clearly and completely described below in conjunction with the specific embodiments of this application and the corresponding drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0048] Example 1

[0049] like Figure 1 As shown, a liquid engine ignition device includes: a storage tank 7, an ignition tube 3, an exhaust one-way valve 9 and a special-shaped shuttle valve 2.

[0050] A tank piston is provided in the storage tank 7, which divides the tank cavity into a mutually independent tank storage cavity and a tank air cavity, wherein the tank storage cavity can store ignition agents required for multiple ignitions.

[0051] An ignition tube piston is installed within the ignition tube 3. This piston divides the ignition tube cavity into a separate tube storage chamber and an extrusion air chamber. The tube storage chamber can hold the ignition agent required for each ignition. The tube storage chamber inlet communicates with the tank storage chamber via an ignition agent pipe, while the tube storage chamber outlet communicates with the combustion chamber. The ignition agent pipe is equipped with a one-way valve 6 that allows fluid from the tank storage chamber to flow into the tube storage chamber.

[0052] The outlet of the tube storage cavity is provided with a discharge one-way valve 4 for controlling the one-way flow of the ignition agent in the tube storage cavity to the combustion chamber. The inlet of the discharge one-way valve 4 is communicated with the tube storage cavity, and its outlet is communicated with the combustion chamber.

[0053] The exhaust check valve 9 is in communication with the tank's air cavity, maintaining the pressure within the tank's air cavity at a preset constant value. Specifically, when the pressure within the tank's air cavity exceeds a set pressure, the exhaust check valve 9 automatically opens and exhausts gas, thereby maintaining the pressure within the tank's air cavity at a preset constant value.

[0054] The first inlet of the special-shaped shuttle valve 2 is connected to the extrusion gas source, the second inlet of the special-shaped shuttle valve 2 is connected to the air cavity of the storage tank, and the outlet of the special-shaped shuttle valve 2 is connected to the extrusion gas cavity. The special-shaped shuttle valve 2 is configured such that during ignition, the extrusion gas source is connected to the extrusion gas cavity, pushing the piston of the ignition tube to move, extruding the ignition agent in the storage cavity of the tube body into the combustion chamber; in the non-ignition state, the extrusion gas cavity is connected to the air cavity of the storage tank, pushing the piston of the storage tank to move, and filling the ignition agent in the storage cavity of the storage tank into the storage cavity of the tube body.

[0055] In this embodiment, the special-shaped shuttle valve is designed as a combination of two one-way valves. It can be controlled by the high-pressure fluid pressure at the first inlet, allowing high-pressure gas in the pipeline to flow from the first inlet into the extrusion gas chamber. When the pressure at the first inlet is reduced, the first inlet is blocked, and the extrusion gas chamber is connected to the tank gas chamber.

[0056] As another embodiment of the present invention, a liquid engine ignition device also includes an exhaust port for sucking gas from the tube body storage cavity and the tank storage cavity before adding ignition agent. The exhaust port is connected to the tube body storage cavity and is provided with an exhaust one-way valve 5.

[0057] As another embodiment of the present invention, a liquid engine ignition device further includes a filling check valve 8 for filling the ignition agent into the tank storage chamber, and the filling check valve 8 is communicated with the tank storage chamber.

[0058] As another embodiment of the present invention, a liquid engine ignition device further includes a solenoid valve 1 for controlling the on-off of a pipeline between an extrusion gas source and a first inlet of a special-shaped shuttle valve 2. The solenoid valve 1 is preferably a two-position three-way solenoid valve.

[0059] As another embodiment of the present invention, a constant tension spring is provided in the extrusion air cavity for pushing the ignition tube piston to move, thereby causing the tube body storage cavity to have an expansion tendency. A constant pressure spring is provided in the storage tank air cavity for pushing the storage tank piston to move, thereby causing the storage tank storage cavity to have a contraction tendency.

[0060] Furthermore, a liquid engine ignition device also includes a tensioning fixture 10 for moving the tank piston before adding ignition agent to ensure sufficient storage space in the tank storage chamber. The tank 7 is provided with a tensioning fixture connection port that communicates with the tank air chamber. The tensioning fixture 10 extends through the tensioning fixture port and is removably fixed to the tank partition. Before adding ignition agent, pulling the tensioning fixture 10 overcomes the elastic force of the constant pressure spring within the tank air chamber, thereby expanding the tank storage chamber to accommodate the ignition agent required for multiple ignitions.

[0061] In this embodiment, the internal pressure of the ignition agent in the storage chamber of the storage tank is 1 MPa; the forward opening pressure of the special-shaped shuttle valve 2 is 6 MPa; the opening pressure of the exhaust check valve 9 is 3 MPa; the pressure of the high-pressure gas connected to the extrusion gas source is 5 MPa; and the opening pressure of the feeding one-way valve 6 is 0.05 MPa.

[0062] In this embodiment, the ignition agent is a mixture of triethylaluminum and triethylboron in a certain proportion, which spontaneously combusts when exposed to oxygen, thereby achieving an ignition function.

[0063] The system parameters of the liquid engine ignition device are verified in the Amesim simulation software. The verification results are as follows: Figure 2-Figure 5 As shown, Figure 2 is the curve of ignition signal changing with time, Figure 3 is the curve of the piston displacement in the tank changing with time, Figure 4 is the curve of the tank driving gas pressure changing with time, Figure 5 It is a curve showing the change of tank flow rate over time, wherein the tank in the figure is actually a storage tank 7 and an ignition tube 3 with the function of storing ignition agent.

[0064] Through analysis, it can be seen that the ignition timeliness and stability of the liquid engine ignition device in this scheme are good, the coordination between various parameters is good, and multiple ignition and filling of the ignition agent can be achieved.

[0065] Example 2

[0066] Based on the same inventive concept, this embodiment provides a liquid engine ignition method, which uses a liquid engine ignition device for ignition.

[0067] like Figure 1 As shown, the liquid engine ignition device includes a storage tank 7, an ignition tube 3, an exhaust one-way valve 9 and a special-shaped shuttle valve 2.

[0068] A tank piston is provided in the storage tank 7, which divides the tank cavity into a mutually independent tank storage cavity and a tank air cavity, wherein the tank storage cavity can store ignition agents required for multiple ignitions.

[0069] An ignition tube piston is installed within the ignition tube 3. This piston divides the ignition tube cavity into a separate tube storage chamber and an extrusion air chamber. The tube storage chamber can hold the ignition agent required for each ignition. The tube storage chamber inlet communicates with the tank storage chamber via an ignition agent pipe, while the tube storage chamber outlet communicates with the combustion chamber. The ignition agent pipe is equipped with a one-way valve 6 that allows fluid from the tank storage chamber to flow into the tube storage chamber.

[0070] The outlet of the pipe body storage cavity is provided with a discharge one-way valve 4 for controlling the one-way flow of the ignition agent in the pipe body storage cavity to the combustion chamber. The inlet of the discharge one-way valve 4 is communicated with the pipe body storage cavity, and its outlet is communicated with the combustion chamber.

[0071] The exhaust check valve 9 is in communication with the tank's air cavity, maintaining the pressure within the tank's air cavity at a preset constant value. Specifically, when the pressure within the tank's air cavity exceeds a set pressure, the exhaust check valve 9 automatically opens and exhausts gas, thereby maintaining the pressure within the tank's air cavity at a preset constant value.

[0072] The first inlet of the special-shaped shuttle valve 2 is connected to the extrusion gas source, the second inlet of the special-shaped shuttle valve 2 is connected to the air cavity of the storage tank, and the outlet of the special-shaped shuttle valve 2 is connected to the extrusion gas cavity. The special-shaped shuttle valve 2 is configured such that during ignition, the extrusion gas source is connected to the extrusion gas cavity, pushing the piston of the ignition tube to move, extruding the ignition agent in the storage cavity of the tube body into the combustion chamber; in the non-ignition state, the extrusion gas cavity is connected to the air cavity of the storage tank, pushing the piston of the storage tank to move, and filling the ignition agent in the storage cavity of the storage tank into the storage cavity of the tube body.

[0073] The special-shaped shuttle valve is designed by combining two one-way valves. It can be controlled by the high-pressure fluid pressure at the first inlet, allowing high-pressure gas in the pipeline to flow from the first inlet into the extrusion air cavity. When the pressure at the first inlet is reduced, the first inlet is blocked and the extrusion air cavity is connected to the tank air cavity.

[0074] Furthermore, a liquid engine ignition device also includes an exhaust port for sucking gas from the tube body storage cavity and the tank storage cavity before adding ignition agent. The exhaust port is connected to the tube body storage cavity and is provided with an exhaust one-way valve 5.

[0075] The liquid engine ignition device further includes a filling one-way valve 8 for filling the ignition agent into the storage chamber of the tank, and the filling one-way valve 8 is communicated with the storage chamber of the tank.

[0076] A liquid engine ignition device further includes a solenoid valve 1 for controlling the on-off of a pipeline between an extrusion gas source and a first inlet of a special-shaped shuttle valve 2. The solenoid valve 1 is preferably a two-position three-way solenoid valve.

[0077] The extrusion air cavity is provided with a constant tension spring for pushing the ignition tube piston to move so that the tube body storage cavity has an expansion trend. The storage tank air cavity is provided with a constant pressure spring for pushing the storage tank piston to move so that the storage tank storage cavity has a contraction trend.

[0078] Furthermore, a liquid engine ignition device also includes a tensioning fixture 10 for moving the tank piston before adding ignition agent to ensure sufficient storage space in the tank storage chamber. The tank 7 is provided with a tensioning fixture connection port that communicates with the tank air chamber. The tensioning fixture 10 extends through the tensioning fixture port and is removably fixed to the tank partition. Before adding ignition agent, pulling the tensioning fixture 10 overcomes the elastic force of the constant pressure spring within the tank air chamber, thereby expanding the tank storage chamber to accommodate the ignition agent required for multiple ignitions.

[0079] Preferably, in this embodiment, the internal pressure of the ignition agent in the storage chamber of the storage tank is 1 MPa; the forward opening pressure of the special-shaped shuttle valve 2 is 6 MPa; the opening pressure of the exhaust check valve 9 is 3 MPa; the pressure of the high-pressure gas connected to the extrusion gas source is 5 MPa; and the opening pressure of the feeding one-way valve 6 is 0.05 MPa.

[0080] The liquid engine ignition method specifically includes the following steps:

[0081] S1. Open the connection port of the tightening tool to connect the air cavity of the storage tank to the atmosphere;

[0082] S2. Vacuum the tube storage cavity and the tank storage cavity through the vacuum port;

[0083] S3. After vacuuming is completed, the vacuum port is sealed;

[0084] S4. Connect the tensioning tool to the tank piston, pull the tank piston to maximize the storage chamber of the tank to store the ignition agent required for multiple ignitions, and secure the tensioning tool.

[0085] S5. Add ignition agent into the storage cavity of the tank through the filling port, and the ignition agent enters the storage cavity of the tube body through the ignition agent tube;

[0086] S6. After the added ignition agent reaches the preset mass, the tensioning fixture is removed and the interface is sealed; at this point, the ignition tube and the lower cavity of the storage tank are filled with ignition agent;

[0087] S7, open the solenoid valve, the high-pressure control gas supplied by the extrusion gas source enters the extrusion gas chamber through the special-shaped shuttle valve, the ignition tube piston moves downward, and the ignition agent in the tube body storage chamber is squeezed out through the discharge check valve at the ignition tube outlet, and enters the combustion chamber for spontaneous ignition;

[0088] S8. After one ignition is completed, the solenoid valve is closed, the extrusion gas source stops supplying high-pressure control gas to the extrusion gas cavity, and the high-pressure gas in the extrusion gas cavity flows into the storage tank gas cavity through the special-shaped shuttle valve. Under the action of the constant tension spring in the extrusion gas cavity and the constant pressure spring in the storage tank gas cavity, the ignition tube piston moves until the tube body storage cavity is in the maximum state capable of storing the ignition agent required for each ignition; during this process, the ignition agent in the storage tank storage cavity enters through the ignition agent tube and fills the tube body storage cavity, meeting the conditions for the next ignition;

[0089] Repeat steps S7 and S8 until all the multiple ignitions of the liquid engine are completed.

[0090] That is to say, steps S1-S6 belong to the process of filling the ignition agent, and S7-S8 belong to the process of single ignition and automatic filling of the ignition agent in the ignition tube after ignition. By repeating steps S7 and S8, the automatic supply of ignition agent to the combustion chamber and the automatic filling of ignition agent can be realized, and the automatic supply of ignition agent can be realized mechanically to realize multiple automatic ignitions of the liquid rocket engine.

[0091] Furthermore, if the ignition agent quality is insufficient after multiple test runs or flights, the ignition agent can be directly added without dismantling the entire liquid engine ignition device fixed to the rocket body:

[0092] First, use kerosene to wipe and tighten the tooling interface, remove the interface plug, and discharge the gas in the tank cavity;

[0093] Then, use the tensioning tool 10 to pull the tank piston to the top, so that the tank storage chamber is in the maximum state capable of storing the ignition agent required for multiple ignitions, and fix the tensioning tool;

[0094] Finally, add ignition agent through the filling check valve 8. After filling, remove the tightening tool 10 and continue to use it after blocking each interface.

[0095] Furthermore, when the ignition tube needs to be disassembled, the liquid engine ignition device can be disassembled and cleaned:

[0096] Remove the components of the ignition tube device from the front of the special-shaped shuttle valve 2 to the back of the ignition tube outlet discharge check valve 4, and soak them in kerosene;

[0097] Remove the plug cap of the tightening tooling interface and discharge the gas in the gas cavity of the tank. There is residual ignition agent in the storage cavity of the tube body and the pressure is less than 3MPa;

[0098] Remove the one-way valve in the kerosene filling process to open the filling port, pull the tensioning tool 10 up and down to absorb the kerosene into the storage chamber of the storage tank and the storage chamber of the pipe body for soaking and cleaning;

[0099] Finally, the liquid engine ignition unit is disassembled into parts and cleaned in kerosene.

[0100] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0101] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0102] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0103] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A liquid engine ignition device, characterized in that: include: A storage tank; a storage tank piston is provided in the storage tank, and the storage tank piston separates the storage tank cavity into a mutually independent storage tank storage cavity and a storage tank air cavity, and the storage tank storage cavity can store the ignition agent required for multiple ignitions; Ignition tube; an ignition tube piston is provided in the ignition tube; the ignition tube piston divides the ignition tube cavity into a mutually independent tube body storage cavity and an extrusion air cavity, the tube body storage cavity being capable of containing the ignition agent required for each ignition; the tube body storage cavity inlet is connected to the tank storage cavity through an ignition agent tube, and the tube body storage cavity outlet is connected to the combustion chamber; the ignition agent tube is provided with a feeding one-way valve that allows the fluid in the tank storage cavity to flow into the tube body storage cavity; the tube body storage cavity outlet is provided with a discharge one-way valve that controls the one-way flow of ignition agent in the tube body storage cavity to the combustion chamber; Exhaust one-way valve; the exhaust one-way valve is connected to the air cavity of the storage tank to maintain the pressure in the air cavity of the storage tank at a preset constant value; A special-shaped shuttle valve; the first inlet of the special-shaped shuttle valve is connected to the extrusion air source, the second inlet of the special-shaped shuttle valve is connected to the air cavity of the storage tank, and the outlet of the special-shaped shuttle valve is connected to the extrusion air cavity; The special-shaped shuttle valve is configured to connect the extrusion gas source with the extrusion gas cavity during ignition, push the ignition tube piston to move, and squeeze the ignition agent in the tube body storage cavity into the combustion chamber; in the non-ignition state, the extrusion gas cavity is connected with the tank gas cavity, push the tank piston to move, and fill the ignition agent in the tank storage cavity into the tube body storage cavity.

2. The liquid engine ignition device according to claim 1, characterized in that: It also includes an exhaust port for extracting gas from the tube body storage cavity and the tank storage cavity before adding ignition agent; the exhaust port is connected to the tube body storage cavity; and the exhaust port is provided with an exhaust one-way valve.

3. The liquid engine ignition device according to claim 1, characterized in that: It also includes a filling one-way valve for filling the ignition agent into the storage chamber of the storage tank; the filling one-way valve is communicated with the storage chamber of the storage tank.

4. The liquid engine ignition device according to claim 1, characterized in that: It also includes a solenoid valve for controlling the on-off of a pipeline between an extrusion gas source and a first inlet of the special-shaped shuttle valve.

5. The liquid engine ignition device according to claim 4, characterized in that: The solenoid valve is a two-position three-way solenoid valve.

6. The liquid engine ignition device according to claim 1, characterized in that: A constant tension spring is provided in the extrusion air cavity for pushing the ignition tube piston to move so that the tube body storage cavity has an expansion trend; a constant pressure spring is provided in the storage tank air cavity for pushing the storage tank piston to move so that the storage tank storage cavity has a contraction trend.

7. The liquid engine ignition device according to claim 6, characterized in that: It also includes a tensioning tool for moving the tank piston before adding ignition agent so that the tank storage cavity has sufficient accommodation space; a tensioning tool connection port connected to the tank air cavity is opened on the tank; the tensioning tool passes through the tensioning tool connection port and is detachably fixedly connected to the tank partition.

8. The liquid engine ignition device according to any one of claims 1 to 7, characterized in that: The internal pressure of the ignition agent in the storage chamber of the storage tank is 1 MPa; the forward opening pressure of the special-shaped shuttle valve is 6 MPa; the opening pressure of the exhaust check valve is 3 MPa; the access pressure of the extrusion gas source is 5 MPa; and the opening pressure of the feeding one-way valve is 0.05 MPa.

9. A liquid engine ignition method, characterized in that: Ignition is performed using a liquid engine ignition device, including: S1. Open the connection port of the tightening tool to connect the air cavity of the storage tank to the atmosphere; S2. Vacuum the tube storage cavity and the tank storage cavity through the vacuum port; S3. After vacuuming is completed, the vacuum port is sealed; S4. Connect the tensioning tool to the tank piston, pull the tank piston to maximize the storage chamber of the tank to store the ignition agent required for multiple ignitions, and secure the tensioning tool. S5. Add ignition agent into the storage cavity of the tank through the filling port, and the ignition agent enters the storage cavity of the tube body through the ignition agent tube; S6. After the added ignition agent reaches the preset mass, the tensioning fixture is removed and the interface is sealed; at this point, the ignition tube and the lower cavity of the storage tank are filled with ignition agent; S7, open the solenoid valve, the high-pressure control gas supplied by the extrusion gas source enters the extrusion gas chamber through the special-shaped shuttle valve, the ignition tube piston moves downward, and the ignition agent in the tube body storage chamber is squeezed out through the discharge check valve at the ignition tube outlet, and enters the combustion chamber for spontaneous ignition; S8. After one ignition is completed, the solenoid valve is closed, the extrusion gas source stops supplying high-pressure control gas to the extrusion gas cavity, and the high-pressure gas in the extrusion gas cavity flows into the storage tank gas cavity through the special-shaped shuttle valve. Under the action of the constant tension spring in the extrusion gas cavity and the constant pressure spring in the storage tank gas cavity, the ignition tube piston moves until the tube body storage cavity is in the maximum state capable of storing the ignition agent required for each ignition; during this process, the ignition agent in the storage tank storage cavity enters through the ignition agent tube and fills the tube body storage cavity, meeting the conditions for the next ignition; Repeat steps S7 and S8 until all the multiple ignitions of the liquid engine are completed.

Images