Solid rocket engine fire extinguishing system and method

Abstract

The invention relates to the technical field of solid rocket engine testing, in particular to a solid rocket engine fire extinguishing system and method. The invention provides a solid rocket engine fire extinguishing system and method, and the system comprises three parts: a fire extinguishing working medium supply system which is composed of a water supply system and a gas supply system, and achieves the free switching of a gas fire extinguishing mode and a liquid fire extinguishing mode; the mechanical supporting system adopts a sliding table module as a supporting structure to realize accurate supporting and positioning in the fire extinguishing process; and the control system remotely controls the fire extinguishing action. According to the fire extinguishing system provided by the invention, the fire extinguishing task can be completed by the fire extinguishing system through two working media. The positioning precision is high during fire extinguishing, and an engine tail nozzle orifice can be accurately aligned. The fire extinguishing system is simple in structure, convenient to operate and maintain, easy to disassemble and convenient to carry.

Description

Technical Field

[0001] The present invention relates to the technical field of solid rocket engine testing, and in particular to a solid rocket engine fire extinguishing system and method. Background Art

[0002] At present, the test bench mainly conducts tests on large and low-safety engines, and also conducts multi-pulse engine tests. The fire extinguishing method after the test of this type of engine is mainly to use a high-pressure water gun to spray from a long distance to extinguish and cool the engine after the test.

[0003] Firstly, this fire extinguishing method requires personnel to use high-pressure water guns to spray water to extinguish the fire at close range. The fire extinguishing time after the engine test is generally within 2 minutes after the engine is completed. The engine flame has not been completely extinguished, and the surface temperature of the test bench is high. The safety risk of fire extinguishers is relatively large, especially when the multi-pulse engine test fails. Some pulses inside have not been ignited. This part of the pulse is a major source of danger. Due to the instability of the partition, the above-mentioned unignited pulses may be ignited as the partition is burned through, which can easily cause secondary damage. Secondly, manual fire extinguishing is adopted. Since the engine residual gunpowder and the test bench cables are still in a burning state, and the harmful gas has not yet spread, it seriously affects the health of on-site personnel.

[0004] At the same time, the use of water as a fire extinguishing medium is likely to cause an explosion and secondary damage due to the missile-mounted battery installed inside the tail compartment of the joint test during the development period. At the same time, the fire extinguishing is likely to bring the engine combustion products into the tail compartment, which brings difficulties to the post-test analysis. Fire extinguishing requires a large amount of water. Toxic and harmful substances produced during the operation of the engine are mixed with water and seep into the ground, causing water pollution. Using water as a fire extinguishing medium has a slow cooling speed. At the same time, due to the slow thermal conductivity of liquid water, the temperature of the parts in contact with water is low, resulting in uneven local temperature distribution. In addition, water has a low boiling point and vaporizes under the high temperature in the engine combustion chamber, causing an instantaneous increase in the pressure in the combustion chamber, thereby causing deformation and cracking of the engine casing, affecting the effectiveness evaluation of mass-produced engines. Using water as a fire extinguishing medium in cold winter weather will cause various parts of the engine to freeze, affecting the engine decomposition and structural analysis after the test. In addition, a large amount of water used for fire extinguishing will be deposited on the test bench and freeze, affecting the use of the test bench and posing a safety hazard.

[0005] In addition, the existing technology also uses a self-made mechanical plugging method, and after the test is completed, the fire is manually blocked and extinguished. In the manual blocking method, whether the flame is completely extinguished depends on whether the plugging cover is manufactured reasonably, and there are great safety hazards in the manual blocking process. In the test of large solid rocket engines, considering the harsh test environment, high-frequency vibration, and high-temperature environment make it impossible for humans to approach, this backward blocking and fire extinguishing method is no longer applicable and is on the verge of being eliminated.

[0006] As the main component of inert fire extinguishing agent, nitrogen fire extinguishing agent belongs to a type of clean gas system. In recent years, it has developed rapidly in China and is gradually becoming popular. It is a fire extinguishing system with huge development potential, excellent performance, and is friendly to both people and the environment. It is also usually used alone, and has the advantages of low cost and no pollution to the atmosphere, and is widely used.

[0007] In view of the single fire extinguishing method adopted after the existing engine test run, the impact on the engine casing and the test bench after the fire extinguishing, and the hidden danger to the personal safety of the operators, the present invention proposes a solid rocket engine fire extinguishing system and method, which aims to remotely control the fire extinguishing device through a PLC controller, adopt a dual-fluid switching mode to extinguish the fire, and can realize water fire extinguishing and nitrogen fire extinguishing for some engines that will not affect the engine casing after water fire extinguishing. For some engines that can only use nitrogen fire extinguishing, only nitrogen can be used for fire extinguishing, so that after the solid rocket engine is tested, the appropriate fire extinguishing method can be selected and remotely controlled automatic fire extinguishing can be performed. Summary of the invention

[0008] The present invention proposes a solid rocket engine fire extinguishing system and method to solve technical problems such as defects in the fire extinguishing method adopted after the solid rocket engine dynamic test, resulting in damage to the engine casing and the test bench body and the existence of major safety hazards.

[0009] In order to achieve the above object, the present invention solves the above technical problems through the following technical solutions:

[0010] Based on the implementation of the above technical solution, the present invention can achieve the following technical effects:

[0011] A solid rocket engine fire extinguishing system, the fire extinguishing system includes three parts:

[0012] The fire extinguishing medium supply system consists of a water supply system and a gas supply system, which can realize the free switching between gas fire extinguishing and liquid fire extinguishing modes;

[0013] The mechanical support system uses a sliding table module as the support structure to achieve precise support positioning during the fire extinguishing process;

[0014] Control system to realize remote control of fire extinguishing action;

[0015] The fire extinguishing medium supply system is connected to the mechanical support system, and the control circuit of the control system is connected to the electrical interface on each slide module to realize the control of the slide module.

[0016] A Y-type three-way electric ball valve is used between the water supply system and the gas supply system to switch between gas fire extinguishing medium and liquid fire extinguishing medium.

[0017] The gas supply system is provided with gas source by a nitrogen cylinder group, and the water supply system is provided with tap water source through a pressure pump.

[0018] The nitrogen cylinder group adopts a busbar structure, each group of cylinders is connected by a reflux pipe, and each group of busbars is connected to a main busbar.

[0019] The mechanical support system consists of a fire-extinguishing nozzle, a three-degree-of-freedom motion displacement platform and a supporting chassis, and the fire-extinguishing nozzle is connected to a fire-extinguishing medium supply system.

[0020] The three-degree-of-freedom motion displacement platform consists of a displacement platform that moves along the Y axis, a displacement platform that rotates along the Z axis, and a displacement platform that moves along the Z axis. The displacement platform that moves along the Z axis is fixedly connected to the displacement platform that rotates along the Z axis, and the displacement platform that rotates along the Z axis is slidably connected to the displacement platform that moves along the Y axis.

[0021] The fire extinguishing nozzle is slidably connected to a displacement platform moving along the Z axis, and can slide up and down on the displacement platform moving along the Z axis, while the displacement platform rotating along the Z axis rotates 360 degrees.

[0022] The translation platform moving along the Y axis is slidably connected to the supporting chassis, and can move horizontally on the translation platform moving along the Y axis on the supporting chassis.

[0023] The control system is composed of a controller for controlling a three-degree-of-freedom motion displacement platform and a Y-type three-way electric ball valve, and a video acquisition device.

[0024] A solid rocket engine fire extinguishing method, a method of extinguishing fire using the fire extinguishing system.

[0025] 1. The present invention provides a solid rocket engine fire extinguishing system and method, which uses an electric Y-type three-way electric ball valve to switch between gas fire extinguishing medium and liquid fire extinguishing medium, so that the fire extinguishing system can complete the fire extinguishing task with two kinds of medium.

[0026] 2. The present invention provides a solid rocket engine fire extinguishing system and method, which adopts a three-degree-of-freedom motion displacement platform with high positioning accuracy to make positioning more accurate, so that the positioning accuracy is high during fire extinguishing and can accurately align with the tail nozzle of the engine.

[0027] 3. The present invention provides a solid rocket engine fire extinguishing system and method, which adopts a slide module as a supporting structure, so that the fire extinguishing system has a simple structure, convenient operation and maintenance, easy disassembly and convenient transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 It is a schematic diagram of a fire extinguishing system provided by the present invention;

[0030] Figure 2 It is a schematic diagram of the busbar structure of the nitrogen cylinder group provided by the present invention;

[0031] Figure 3 It is a schematic diagram of the structure of the mechanical support system provided by the present invention;

[0032] Figure 4 It is a structural schematic diagram of the automatic fire extinguishing system provided by the present invention;

[0033] Figure 5 It is a schematic diagram of a control system provided by the present invention;

[0034] Figure 6 It is a control program block diagram provided by the present invention. DETAILED DESCRIPTION

[0035] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0036] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0037] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0038] In the embodiments of the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0039] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0040] Combine the following Figure 1-Figure 6 A solid rocket engine fire extinguishing system and method provided by the present invention are introduced in detail:

[0041] Combination Figure 1 As shown, in an embodiment of the present invention, a solid rocket engine fire extinguishing system and method, the fire extinguishing system includes three parts:

[0042] The fire extinguishing medium supply system consists of a water supply system and a gas supply system, which can realize the free switching between gas fire extinguishing and liquid fire extinguishing modes;

[0043] The mechanical support system uses a sliding table module as the support structure to achieve precise support positioning during the fire extinguishing process;

[0044] Control system to realize remote control of fire extinguishing action.

[0045] A Y-type three-way electric ball valve is used between the water supply system and the gas supply system to switch between gas fire extinguishing medium and liquid fire extinguishing medium.

[0046] Furthermore, the fire extinguishing fluid supply system is connected to the fire extinguishing nozzle on the mechanical support system through connecting pipes, solenoid valves and DN50 external thread connectors; the control circuit of the control system is connected to the electrical interface on each slide module to realize the control of the slide module.

[0047] Combination Figure 2 As shown, the gas supply system is provided with gas source by a nitrogen cylinder group. The cylinder group usually uses a busbar structure. The parallel structure is a structure in which the cylinders in the cylinder group are directly connected to the main manifold with pipelines, while the busbar structure is a structure in which the cylinders in the cylinder group are divided into several groups on the basis of the parallel structure, and each group of cylinders is connected with a manifold, and then each group of manifolds is connected to the main manifold. A pressure regulating valve is installed on each cylinder, and it is connected to the main pipeline through a high-pressure stainless steel hose, and a control valve is installed on the main pipeline. In this way, the pressure difference between the cylinders can be reduced and the gas utilization rate can be improved.

[0048] The water supply system is provided by tap water through a pressure pump. During the working process, the remote human-machine interface drives the control valve to operate, and after selecting gas or liquid fire extinguishing agent, the fire extinguishing agent is transported from the main pipeline to the terminal nozzle for spraying and extinguishing.

[0049] The gas fire extinguishing agent is provided by a nitrogen cylinder group, and the liquid fire extinguishing agent is provided by a tap water source through a pressure pump. It mainly includes a nitrogen cylinder group, a one-way valve, a collecting pipe, a safety release device, a bottle group bracket, a nozzle, a spray hood, a control valve, a high-pressure hose, a pressure pump, and a system spraying pipeline and fixed components.

[0050] Nitrogen cylinder group: for storing fire extinguishing agent; mainly including steel cylinder, volumetric valve, etc., and storing nitrogen fire extinguishing agent inside. Specifications: single cylinder volume 40L, maximum working pressure 12.5MPa.

[0051] One-way valve: prevents the fire extinguishing agent in each gas cylinder from flowing to other cylinder groups after spraying. Specification: DN15, rated working pressure: 15MPa, main body material: HPb59-1.

[0052] Combination Figure 3 , Figure 4 As shown, the mechanical support system consists of a fire extinguishing nozzle, a three-degree-of-freedom motion displacement platform and a supporting chassis, and the fire extinguishing nozzle is connected to the fire extinguishing medium supply system.

[0053] Furthermore, the three-degree-of-freedom motion displacement platform consists of a displacement platform that moves along the Y axis, a displacement platform that rotates along the Z axis, and a displacement platform that moves along the Z axis. The displacement platform that moves along the Z axis is fixedly connected to the displacement platform that rotates along the Z axis, and the displacement platform that rotates along the Z axis is slidably connected to the displacement platform that moves along the Y axis.

[0054] Furthermore, the translation stage moving along the Y axis is fixed to the ground by an M30 anchor screw, the translation stage rotating along the Z axis is connected to the translation stage moving along the Y axis by a thread, and the translation stage moving up and down along the Z axis is connected to the rotating translation stage rotating along the Z axis by a thread.

[0055] The fire-extinguishing nozzle is fixedly connected to the translation table moving along the Z axis, and rotates 360° around the translation table rotating along the Z axis, with an accuracy of 0.02° and an infinite range; the translation table moving along the Z axis slides up and down, that is, the linear guide slide module moving along the vertical direction of the Z axis, and the translation table moving along the Y axis, with an accuracy of 0.03-0.05mm, and the movement ranges are 0-2m and 0-1m respectively.

[0056] The translation platform moving along the Y axis is slidably connected to the supporting chassis, and can move horizontally on the translation platform moving along the Y axis on the supporting chassis.

[0057] The control system is composed of a controller for controlling a three-degree-of-freedom motion displacement platform and a Y-type three-way electric ball valve, and a video acquisition device.

[0058] Combination Figure 5 As shown in the figure, the control system mainly includes two controllers, one part controls the rotation of the three-degree-of-freedom motion displacement platform by 180°, and the other part controls the selection and switching of the electric three-way valve control system for the type of fire extinguishing agent. The control system includes a video acquisition system, and the human-machine interface is used to display the test site image in real time, and the action of the fire extinguishing equipment can be remotely controlled. The control system can be parameterized and has functions such as high automation and remote control.

[0059] Example

[0060] Combination Figure 6As shown, the operator remotely observes the high-definition video when the engine is finished working, and then remotely controls the three-degree-of-freedom motion displacement platform and the three-way electric ball valve through the integrated controller. When the displacement platform rotating around the Z axis rotates to the 0° position and contacts the contact switch on the right, the signal composed of the two contact switches can be represented as 01 in the control program; when the fire extinguishing device starts to extinguish the fire, that is, when the displacement platform rotating along the Z axis rotates to the 180° position and contacts the contact switch on the left, the signal composed of the two contact switch sensors is 10. The three-way electric ball valve is remotely controlled to open and the engine is extinguished. When the fire is extinguished, the three-way electric ball valve is remotely controlled to close, so that the displacement platform rotating around the Z axis rotates to the initial position.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A solid rocket engine fire extinguishing system, characterized in that: The fire extinguishing system consists of three parts: The fire extinguishing medium supply system consists of a water supply system and a gas supply system, which can realize the free switching between gas fire extinguishing and liquid fire extinguishing modes; The mechanical support system uses a sliding table module as the support structure to achieve precise support positioning during the fire extinguishing process; Control system to realize remote control of fire extinguishing action; The fire extinguishing medium supply system is connected to the mechanical support system, and the control circuit of the control system is connected to the electrical interface on each slide module to realize the control of the slide module.

2. The solid rocket engine fire extinguishing system according to claim 1, characterized in that: A Y-type three-way electric ball valve is used between the water supply system and the gas supply system to switch between gas fire extinguishing medium and liquid fire extinguishing medium.

3. The solid rocket engine fire extinguishing system according to claim 2, characterized in that: The gas supply system is provided with gas source by a nitrogen cylinder group, and the water supply system is provided with tap water source through a pressure pump.

4. The solid rocket engine fire extinguishing system according to claim 3, characterized in that: The nitrogen cylinder group adopts a busbar structure, each group of cylinders is connected by a reflux pipe, and each group of busbars is connected to a main busbar.

5. The solid rocket engine fire extinguishing system according to claim 4, characterized in that: The mechanical support system consists of a fire-extinguishing nozzle, a three-degree-of-freedom motion displacement platform and a supporting chassis, and the fire-extinguishing nozzle is connected to a fire-extinguishing medium supply system.

6. The solid rocket engine fire extinguishing system according to claim 5, characterized in that: The three-degree-of-freedom motion displacement platform consists of a displacement platform that moves along the Y axis, a displacement platform that rotates along the Z axis, and a displacement platform that moves along the Z axis. The displacement platform that moves along the Z axis is fixedly connected to the displacement platform that rotates along the Z axis, and the displacement platform that rotates along the Z axis is slidably connected to the displacement platform that moves along the Y axis.

7. The solid rocket engine fire extinguishing system according to claim 6, characterized in that: The fire extinguishing nozzle is slidably connected to a displacement platform moving along the Z axis, and can slide up and down on the displacement platform moving along the Z axis, while the displacement platform rotating along the Z axis rotates 360 degrees.

8. The solid rocket engine fire extinguishing system according to claim 7, characterized in that: The translation platform moving along the Y axis is slidably connected to the supporting chassis, and can move horizontally on the translation platform moving along the Y axis on the supporting chassis.

9. The solid rocket engine fire extinguishing system according to claim 8, characterized in that: The control system is composed of a controller for controlling a three-degree-of-freedom motion displacement platform and a Y-type three-way electric ball valve, and a video acquisition device.

10. A method for extinguishing a solid rocket engine fire, characterized in that: A method for extinguishing a fire using the fire extinguishing system according to any one of claims 1 to 9.

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