A liquid engine ignition device and ignition method

Abstract

This invention discloses a liquid engine ignition device and method. The liquid engine ignition device includes a storage tank, an ignition tube, an exhaust check valve, and a shaped shuttle valve. The storage tank contains a storage tank piston, dividing the tank cavity into a storage chamber and a storage gas chamber. The ignition tube contains an ignition tube piston, dividing the ignition tube cavity into a tube body storage chamber and a compression gas chamber. The tube body storage chamber can hold the ignition propellant required for each ignition. The inlet of the tube body storage chamber is connected to the storage tank cavity, and the outlet is connected to the combustion chamber. During ignition, the shaped shuttle valve connects the compression gas source to the compression gas chamber, pushing the ignition tube piston to move and extruding the ignition propellant from the tube body storage chamber into the combustion chamber. In the non-ignition state, the compression gas chamber is connected to the storage tank cavity, pushing the storage tank piston to move and filling the tube body storage chamber with the ignition propellant from the storage tank cavity. This invention provides an engine ignition device that can automatically fill the ignition propellant and achieve multiple ignitions, and has a simple structure and good stability.

Description

Technical Field

[0001] This invention relates to the field of liquid engine ignition technology, and particularly to a liquid engine ignition device and ignition method. Background Technology

[0002] With the development of aerospace technology, liquid rocket recovery technology is crucial for reducing rocket launch costs, and this technology requires multiple reliable engine ignitions. Currently, the main methods for multiple ignitions of liquid rocket engines in China include electric spark ignition, gunpowder ignition, and ignition agent ignition.

[0003] Electric spark ignition systems require additional oxidizer and fuel supply systems and special ignition structures, making the system more complex. This problem becomes more prominent when high-thrust engines ignite multiple times.

[0004] The biggest drawback of gunpowder ignition is that the gunpowder residue produced during ignition may create excess material in the engine that can clog the combustion chamber nozzle. In addition, each igniter requires a separate mounting structure and circuit interface, making the ignition device structure redundant.

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

[0006] In daily practice, the existing technical solutions have been found to have the following problems:

[0007] Currently, there are two structural types of devices capable of multiple ignitions of the igniter: First, a tank-based system involving direct compression and multiple ignition under a complex control system. Multiple compression ignitions occur directly within the tank, with the compression rate controlled by solenoid valves. This system places high demands on the valves and suffers from poor stability in the igniter injection rate. Second, a system with multiple ignition tubes 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 systems.

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

[0009] To address the aforementioned technical problems, this application provides a liquid engine ignition device and ignition method, offering a highly efficient and reliable engine multiple ignition scheme. The engine ignition device is capable of automatically filling the ignition agent and achieving multiple ignitions, and has a simple structure and good stability.

[0010] A liquid engine ignition device, comprising:

[0011] Storage tank; the storage tank is equipped with a storage tank piston, which divides the storage tank cavity into an independent storage tank cavity and a storage tank gas cavity, and the storage tank cavity can store the ignition agent required for multiple ignitions;

[0012] An ignition tube is provided; an ignition tube piston is installed inside the ignition tube; the ignition tube piston divides the ignition tube cavity into an independent tube storage cavity and a compressed gas cavity, the tube storage cavity being able to hold the ignition agent required for each ignition; the inlet of the tube storage cavity is connected to the storage cavity of the tank via an ignition agent tube, and the outlet of the tube storage cavity is connected to the combustion chamber; a one-way valve is provided on the ignition agent tube to allow fluid in the storage cavity of the tank to flow into the tube storage cavity; a one-way valve is provided at the outlet of the tube storage cavity to control the unidirectional flow of ignition agent from the tube storage cavity to the combustion chamber.

[0013] One-way exhaust valve; the one-way exhaust valve is connected to the gas chamber of the storage tank, so that the pressure in the gas chamber of the storage tank is maintained 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 chamber of the storage tank, and the outlet of the special-shaped shuttle valve is connected to the extrusion air chamber;

[0015] The shaped shuttle valve is configured such that, during ignition, the extrusion gas source is connected to the extrusion gas chamber, pushing the ignition tube piston to move and squeezing the ignition agent in the tube storage chamber into the combustion chamber; and during non-ignition, the extrusion gas chamber is connected to the storage tank gas chamber, pushing the storage tank piston to move and filling the ignition agent in the storage tank storage chamber into the tube storage chamber.

[0016] Preferably, it further includes an extraction port for drawing gas from the tube storage cavity and the tank storage cavity before adding the ignition agent; the extraction port is connected to the tube storage cavity; the extraction port is equipped with an extraction one-way valve.

[0017] Preferably, it also includes a one-way valve for injecting ignition agent into the storage cavity of the tank; the one-way valve is connected to the storage cavity of the tank.

[0018] Preferably, it also includes a solenoid valve for controlling the opening and closing of the pipeline between the extrusion air source and the first inlet of the shaped shuttle valve.

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

[0020] Preferably, the extrusion chamber is provided with a tension spring for pushing the ignition tube piston to move, so that the tube storage cavity tends to expand; the storage tank chamber is provided with a pressure spring for pushing the storage tank piston to move, so that the storage tank storage cavity tends to shrink.

[0021] Preferably, it further includes a tensioning fixture for moving the tank piston before adding the ignition agent, so that the tank storage cavity has sufficient space to accommodate it; the tank has a tensioning fixture connection port communicating with the tank gas cavity; the tensioning fixture passes through the tensioning fixture 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 shaped shuttle valve is 6 MPa; the opening pressure of the exhaust check valve is 3 MPa; the pressure of the extrusion gas source is 5 MPa; and the opening pressure of the feed check valve is 0.05 MPa.

[0023] According to another aspect of this application, a liquid engine ignition method is also provided, which utilizes a liquid engine ignition device for ignition, comprising:

[0024] S1. Open the connection port of the tensioning fixture to connect the gas chamber of the storage tank to the atmosphere;

[0025] S2. Vacuum the pipe storage chamber and the tank storage chamber through the air extraction port;

[0026] S3. After vacuuming is complete, seal the air extraction port;

[0027] S4. Connect the tensioning fixture to the tank piston, pull the tank piston to make the tank storage chamber reach the maximum state that can store the igniter required for multiple ignitions, and fix the tensioning fixture.

[0028] S5. Add ignition agent into the storage chamber of the tank through the filling port. The ignition agent enters the storage chamber of the pipe body through the ignition agent pipe.

[0029] S6. After the added ignition agent reaches the preset mass, remove the tensioning fixture and seal the interface; at this time, 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 shuttle valve. The ignition tube piston moves downward, squeezing the ignition agent in the tube storage chamber out from the discharge check valve at the outlet of the ignition tube and entering the combustion chamber for auto-ignition.

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

[0032] Repeat steps S7 and S8 until all 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 uses an ignition agent storage tank that can store the mass of ignition agent required for multiple ignitions, and an ignition tube that can quantitatively store the mass of ignition agent required for one ignition. A one-way valve is installed between the storage tank and the ignition tube. Automatic filling is achieved by 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 usability and maintainability.

[0035] 2. This invention uses a mechanical structure to automatically complete the quantitative filling of 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 compressed air source equipped with a solenoid valve to control whether ignition occurs, and the structure is simple.

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

[0038] 5. The invention employs a high back pressure discharge check valve to seal the ignition tube, enabling the multiple uses of a single ignition tube. Attached Figure Description

[0039] The following sections will describe some specific embodiments of the invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or portions. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

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

[0041] Figure 2 This is a curve showing how the ignition signal changes over time.

[0042] Figure 3 The curve shows the change in piston displacement within the tank over time.

[0043] Figure 4 The curve shows the change of tank driving gas pressure over time.

[0044] Figure 5 This is a curve showing the change in tank flow rate over time.

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

[0046] 1. Solenoid valve; 2. Special-shaped shuttle valve; 3. Ignition tube; 4. Discharge check valve; 5. Air extraction check valve; 6. Feeding check valve; 7. Storage tank; 8. Filling check valve; 9. Exhaust check valve; 10. Tensioning fixture. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort 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 pipe 3, an exhaust check valve 9, and a shaped shuttle valve 2.

[0050] The storage tank 7 is equipped with a storage tank piston, which divides the storage tank cavity into an independent storage tank cavity and a storage tank gas cavity. The storage tank cavity can store the ignition agent required for multiple ignitions.

[0051] An ignition tube piston is installed inside the ignition tube 3, which divides the ignition tube cavity into an independent tube storage cavity and a compression gas cavity. The tube storage cavity can hold the ignition agent required for each ignition. The inlet of the tube storage cavity is connected to the storage tank cavity via an ignition agent tube, and the outlet of the tube storage cavity is connected to the combustion chamber. A one-way valve 6 is installed on the ignition agent tube to allow fluid in the storage tank cavity to flow into the tube storage cavity.

[0052] The outlet of the tube storage chamber is equipped with a discharge check valve 4 to control the unidirectional flow of ignition agent from the tube storage chamber to the combustion chamber. The inlet of the discharge check valve 4 is connected to the tube storage chamber, and its outlet is connected to the combustion chamber.

[0053] The exhaust check valve 9 is connected to the gas chamber of the storage tank, maintaining the pressure inside the gas chamber at a preset constant value. That is, when the pressure inside the gas chamber of the storage tank exceeds the set pressure, the exhaust check valve 9 can automatically open and discharge gas, thereby maintaining the pressure inside the gas chamber of the storage tank at a preset constant value.

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

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

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

[0057] As another embodiment of the present invention, a liquid engine ignition device further includes a one-way valve 8 for adding ignition agent to the storage chamber of a storage tank, the one-way valve 8 being connected to the storage chamber of the storage tank.

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

[0059] In another embodiment of the present invention, a tension spring is provided in the compression chamber to push the ignition tube piston to move, causing the tube storage cavity to expand. A pressure spring is provided in the storage tank chamber to push the storage tank piston to move, causing the storage tank storage cavity to contract.

[0060] Furthermore, a liquid engine ignition device also includes a tensioning fixture 10 for moving the tank piston before adding the ignition agent, so that the tank storage cavity has sufficient space to accommodate it. The tank 7 has a tensioning fixture connection port communicating with the tank's gas cavity, and the tensioning fixture 10 passes through the tensioning fixture connection port and is detachably fixedly connected to the tank partition. Before adding the ignition agent, pulling the tensioning fixture 10 can overcome the elastic force of the atmospheric pressure spring in the tank's gas cavity, thereby expanding the tank storage cavity to have space to accommodate the ignition agent required for multiple ignitions.

[0061] In this embodiment, the internal pressure of the igniter in the storage chamber of the tank is 1 MPa; the forward opening pressure of the 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 feed check valve 6 is 0.05 MPa.

[0062] In this embodiment, the igniter is a mixture of triethylaluminum and triethylboron in a certain proportion, which spontaneously combusts upon contact with oxygen, thus achieving the ignition function.

[0063] The system parameters of the liquid engine ignition device were verified using the Amesim simulation software. The verification results are as follows: Figures 2-5 As shown, where, Figure 2 This is a curve showing how the ignition signal changes over time. Figure 3 This is a curve showing the change in piston displacement within the tank over time. Figure 4 This is a curve showing the change in tank driving gas pressure over time. Figure 5 The graph shows the flow rate of the storage tank over time. The storage tank in the graph is actually the storage tank 7, which has the function of storing ignition agent, and the ignition tube 3.

[0064] Analysis shows that the liquid engine ignition device in this scheme has good ignition timeliness and stability, and good synergy among various parameters, which can realize multiple ignition and filling of the igniter.

[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 pipe 3, an exhaust check valve 9, and a special-shaped shuttle valve 2.

[0068] The storage tank 7 is equipped with a storage tank piston, which divides the storage tank cavity into an independent storage tank cavity and a storage tank gas cavity. The storage tank cavity can store the ignition agent required for multiple ignitions.

[0069] An ignition tube piston is installed inside the ignition tube 3, which divides the ignition tube cavity into an independent tube storage cavity and a compression gas cavity. The tube storage cavity can hold the ignition agent required for each ignition. The inlet of the tube storage cavity is connected to the storage tank cavity via an ignition agent tube, and the outlet of the tube storage cavity is connected to the combustion chamber. A one-way valve 6 is installed on the ignition agent tube to allow fluid in the storage tank cavity to flow into the tube storage cavity.

[0070] The outlet of the tube storage chamber is equipped with a discharge check valve 4 to control the unidirectional flow of ignition agent from the tube storage chamber to the combustion chamber. The inlet of the discharge check valve 4 is connected to the tube storage chamber, and its outlet is connected to the combustion chamber.

[0071] The exhaust check valve 9 is connected to the gas chamber of the storage tank, maintaining the pressure inside the gas chamber at a preset constant value. That is, when the pressure inside the gas chamber of the storage tank exceeds the set pressure, the exhaust check valve 9 can automatically open and discharge gas, thereby maintaining the pressure inside the gas chamber of the storage tank at a preset constant value.

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

[0073] The shaped shuttle valve is designed as a combination of two one-way valves. It can control the flow of high-pressure gas from the pipeline into the extrusion chamber through the high-pressure fluid pressure at the first inlet. After the pressure at the first inlet decreases, the first inlet can be blocked, and the extrusion chamber can be connected to the storage tank's gas chamber.

[0074] Furthermore, a liquid engine ignition device also includes an extraction port for drawing gas from the tube storage chamber and the tank storage chamber before adding igniter. The extraction port is connected to the tube storage chamber and is equipped with an extraction check valve 5.

[0075] A liquid engine ignition device further includes a one-way valve 8 for adding ignition agent to the storage chamber of a storage tank, the one-way valve 8 being connected to the storage chamber of the storage tank.

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

[0077] The compression chamber is equipped with a tension spring that pushes the ignition tube piston to move, causing the tube storage cavity to expand. The storage tank chamber is equipped with a pressure spring that pushes the storage tank piston to move, causing the storage tank storage cavity to contract.

[0078] Furthermore, a liquid engine ignition device also includes a tensioning fixture 10 for moving the tank piston before adding the ignition agent, so that the tank storage cavity has sufficient space to accommodate it. The tank 7 has a tensioning fixture connection port communicating with the tank's gas cavity, and the tensioning fixture 10 passes through the tensioning fixture connection port and is detachably fixedly connected to the tank partition. Before adding the ignition agent, pulling the tensioning fixture 10 can overcome the elastic force of the atmospheric pressure spring in the tank's gas cavity, thereby expanding the tank storage cavity to have space to accommodate the ignition agent required for multiple ignitions.

[0079] Preferably, in this embodiment, the internal pressure of the igniter in the storage chamber of the tank is 1 MPa; the forward opening pressure of the 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 feed check 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 tensioning fixture to connect the gas chamber of the storage tank to the atmosphere;

[0082] S2. Vacuum the pipe storage chamber and the tank storage chamber through the air extraction port;

[0083] S3. After vacuuming is complete, seal the air extraction port;

[0084] S4. Connect the tensioning fixture to the tank piston, pull the tank piston to make the tank storage chamber reach the maximum state that can store the igniter required for multiple ignitions, and fix the tensioning fixture.

[0085] S5. Add ignition agent into the storage chamber of the tank through the filling port. The ignition agent enters the storage chamber of the pipe body through the ignition agent pipe.

[0086] S6. After the added ignition agent reaches the preset mass, remove the tensioning fixture and seal the interface; at this time, 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 shuttle valve. The ignition tube piston moves downward, squeezing the ignition agent in the tube storage chamber out from the discharge check valve at the outlet of the ignition tube and entering the combustion chamber for auto-ignition.

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

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

[0090] In other words, steps S1-S6 belong to the ignition agent loading process, and S7-S8 belong to the automatic loading process of ignition agent in the ignition tube after the first ignition. By repeating steps S7 and S8, the automatic supply of ignition agent to the combustion chamber and the automatic loading of ignition agent can be achieved. The automatic supply of ignition agent can be achieved by mechanical means, so as to realize the multiple automatic ignition of the liquid rocket engine.

[0091] Furthermore, if the ignition propellant is insufficient after multiple test runs or flights, the ignition propellant can be directly replenished without completely removing the liquid engine ignition device fixed to the rocket body.

[0092] First, wipe the tightened tooling interface with kerosene, remove the interface plug, and release the gas in the gas chamber of the storage tank.

[0093] Then, use the tensioning fixture 10 to pull the tank piston to the top, so that the storage chamber of the tank is in the maximum state that can store the ignition agent required for multiple ignitions and fix the tensioning fixture.

[0094] Finally, add ignition agent through the one-way valve 8, and after filling, remove the tensioning fixture 10, seal all interfaces, and continue to use.

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

[0096] Remove the components of the ignition tube device from before the shaped shuttle valve 2 to after the ignition tube outlet discharge check valve 4, and soak them in kerosene.

[0097] Remove the plug cap from the tensioning tool interface, and release the gas in the gas chamber of the storage tank. There is residual igniter in the storage chamber of the pipe body and the pressure is less than 3MPa.

[0098] Remove the one-way valve in the kerosene to open the filling port, pull the tightening fixture 10 up and down to draw the kerosene into the storage tank cavity and pipe cavity for soaking and cleaning.

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

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

[0101] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0102] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0103] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A liquid engine ignition device, characterized in that, include: Storage tank; the storage tank is equipped with a storage tank piston, which divides the storage tank cavity into an independent storage tank cavity and a storage tank gas cavity, and the storage tank cavity can store the ignition agent required for multiple ignitions; An ignition tube is provided; an ignition tube piston is installed inside the ignition tube; the ignition tube piston divides the ignition tube cavity into an independent tube storage cavity and a compressed gas cavity, the tube storage cavity being able to hold the ignition agent required for each ignition; the inlet of the tube storage cavity is connected to the storage cavity of the tank via an ignition agent tube, and the outlet of the tube storage cavity is connected to the combustion chamber; a one-way valve is provided on the ignition agent tube to allow fluid in the storage cavity of the tank to flow into the tube storage cavity; a one-way valve is provided at the outlet of the tube storage cavity to control the unidirectional flow of ignition agent from the tube storage cavity to the combustion chamber. One-way exhaust valve; the one-way exhaust valve is connected to the gas chamber of the storage tank, so that the pressure in the gas chamber of the storage tank is maintained 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 chamber of the storage tank, and the outlet of the special-shaped shuttle valve is connected to the extrusion air chamber; The shaped shuttle valve is configured such that, during ignition, the extrusion gas source is connected to the extrusion gas chamber, pushing the ignition tube piston to move and squeezing the ignition agent in the tube storage chamber into the combustion chamber; and during non-ignition, the extrusion gas chamber is connected to the storage tank gas chamber, pushing the storage tank piston to move and filling the ignition agent in the storage tank storage chamber into the tube storage chamber.

2. The liquid engine ignition device as described in claim 1, characterized in that, It also includes an extraction port for drawing gas from the storage chamber of the tube body and the storage chamber of the tank before adding the ignition agent; the extraction port is connected to the storage chamber of the tube body; the extraction port is equipped with an extraction one-way valve.

3. The liquid engine ignition device as described in claim 1, characterized in that, It also includes a one-way valve for injecting ignition agent into the storage cavity of the tank; the one-way valve is connected to the storage cavity of the tank.

4. The liquid engine ignition device as described in claim 2, characterized in that, It also includes a solenoid valve that controls the connection and disconnection of the pipeline between the extrusion air source and the first inlet of the shaped shuttle valve.

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

6. The liquid engine ignition device as described in claim 4, characterized in that, The compression chamber is equipped with a tension spring for pushing the ignition tube piston to move, causing the tube storage cavity to expand; the storage tank chamber is equipped with a pressure spring for pushing the storage tank piston to move, causing the storage tank storage cavity to shrink.

7. The liquid engine ignition device as described in claim 6, characterized in that, It also includes a tensioning fixture for moving the tank piston before adding the ignition agent, so that the tank storage cavity has sufficient space to accommodate it; the tank has a tensioning fixture connection port that communicates with the tank gas cavity; the tensioning fixture passes through the tensioning fixture connection port and is detachably fixedly connected to the tank partition.

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

9. A liquid engine ignition method, characterized in that, Ignition using the liquid engine ignition device of claim 7 includes: S1. Open the connection port of the tensioning fixture to connect the gas chamber of the storage tank to the atmosphere; S2. Vacuum the pipe storage chamber and the tank storage chamber through the air extraction port; S3. After vacuuming is complete, seal the air extraction port; S4. Connect the tensioning fixture to the tank piston, pull the tank piston to make the tank storage chamber reach the maximum state that can store the igniter required for multiple ignitions, and fix the tensioning fixture. S5. Add ignition agent into the storage chamber of the tank through the filling port. The ignition agent enters the storage chamber of the pipe body through the ignition agent pipe. S6. After the added ignition agent reaches the preset mass, remove the tensioning fixture and seal the interface; at this time, 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 shuttle valve. The ignition tube piston moves downward, squeezing the ignition agent in the tube storage chamber out from the discharge check valve at the outlet of the ignition tube and entering the combustion chamber for auto-ignition. S8. After one ignition is completed, the solenoid valve is closed, and the extrusion gas source stops supplying high-pressure control gas to the extrusion gas chamber. The high-pressure gas in the extrusion gas chamber flows into the storage tank gas chamber through the special-shaped shuttle valve. Under the action of the constant tension spring in the extrusion gas chamber and the constant pressure spring in the storage tank gas chamber, the ignition tube piston moves until the tube storage chamber is in the maximum state that can store the ignition agent required for each ignition. During this process, the ignition agent in the storage tank storage chamber enters through the ignition agent tube and fills the tube storage chamber, thus meeting the conditions for the next ignition. Repeat steps S7 and S8 until all ignitions of the liquid engine are completed.

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