Extrusion solid rocket motor charge system and method of use

Abstract

The present invention relates to the technical field of solid motors, and provides an extrusion-type solid motor charging system and a usage method. The extrusion-type solid motor charging system includes: an extrusion device, a filtering device, and a forming device. The extrusion device includes: a cylinder block and a piston. The cylinder block is adapted to contain a propellant slurry and is provided with a slurry outlet. The piston is slidably disposed in the cylinder block and is adapted to extrude the propellant slurry to be discharged through the slurry outlet. The filtering device is connected to the slurry outlet and is used for filtering air in the propellant slurry. The forming device includes a housing, and the housing is the combustion chamber of the solid motor. The combustion chamber is connected to the filtering device and is used for discharging the propellant slurry after filtering air and pressurizing and curing it into a shape. The present invention has a controllable filling speed and charge amount, can realize the pressurizing and curing forming of the propellant slurry, and improve the overall performance of the motor; and can discharge the residual air in the propellant slurry to ensure the quality of the motor, and has the characteristics of high charging efficiency, high safety and reliability, etc.

Description

Technical Field

[0001] The present invention relates to the technical field of solid motors, and particularly to an extrusion-type solid motor charging system and a using method thereof. Background Art

[0002] A solid motor generally refers to a solid rocket motor, which is composed of a solid propellant charge, a combustion chamber, a nozzle assembly, an ignition device, etc. The solid propellant charge is a hollow cylinder made of a propellant and a small amount of additives. The hollow part is the combustion surface, and its cross-sectional shape is circular, star-shaped, etc. The solid propellant charge is placed in the combustion chamber, and after being ignited, it burns in the combustion chamber. The high-temperature and high-pressure combustion products flow through the nozzle assembly, expand and accelerate therein, and the thermal energy is converted into kinetic energy, and are discharged from the nozzle assembly at a high speed to generate thrust.

[0003] In the production process of traditional solid motors, the charging of the combustion chamber mostly adopts the casting molding method, that is, the mixed propellant slurry is loaded into a hopper, the hopper is connected to the shell to be charged, pre-placed in a casting cylinder, and after being sealed, the casting cylinder is evacuated to a near-vacuum environment by a vacuum pump. The slurry is poured into the shell by the action of gravity and negative pressure. The overall structure is complex and the cost is high; and before casting, it is necessary to prepare the casting cylinder for vacuum pumping in advance. During the whole casting process, it is necessary to maintain airtightness and vacuum degree, and the energy consumption is high. In addition, relying on atmospheric pressure and the gravity of the slurry for casting, the flow rate is limited and uncontrollable, and the whole casting cycle is long and the production efficiency is low. Summary of the Invention

[0004] The present invention provides an extrusion-type solid motor charging system and a using method thereof, which adopt an extrusion device for extrusion and transportation, the filling speed and the amount of medicine are controllable, and it is easier to realize the pressurized curing molding of the propellant slurry. It can improve the interfacial bonding performance between the formed propellant charge and the shell of the forming device, reduce the stress level caused by the curing of the propellant charge, and is beneficial to improving the filling fraction of the combustion chamber, thereby improving the overall performance of the motor; and a filtering device is adopted to discharge the residual air in the propellant slurry, ensure the quality of the motor, and save the casting cylinder and vacuum pumping equipment, and has technical characteristics such as simple structure, low cost, high charging efficiency, high integration degree of the process and equipment, high safety and reliability.

[0005] The present invention provides an extrusion-type solid motor charging system, comprising:

[0006] An extrusion device, comprising: a cylinder body and a piston. The cylinder body is adapted to contain a propellant slurry and is provided with a slurry outlet. The piston is slidably disposed in the cylinder body and is adapted to extrude the propellant slurry to be discharged through the slurry outlet;

[0007] A filtering device, which is connected to the slurry outlet of the cylinder body through a first conveying pipeline, and is used for discharging the propellant slurry and filtering the air in the propellant slurry;

[0008] The forming device includes a housing, and the housing is the combustion chamber of a solid rocket motor. The combustion chamber is connected to the filtering device through a second conveying pipeline, and is used for discharging the propellant slurry after filtering the air through the extrusion device and pressurizing and solidifying it into a shape.

[0009] A kind of extrusion-type solid rocket motor charging system provided by the present invention, the filtering device includes:

[0010] A box body, provided with a feeding port and a discharging port. The feeding port is connected to the first conveying pipeline, the discharging port is connected to the second conveying pipeline, and the box body is provided with a discharge hole;

[0011] At least one layer of filtering structure, arranged inside the box body. The filtering structure includes: two layers of first ultra-high molecular weight polyethylene membranes. A slurry channel is formed between the two layers of first ultra-high molecular weight polyethylene membranes. The two ends of the slurry channel are respectively communicated with the feeding port and the discharging port, and each layer of the first ultra-high molecular weight polyethylene membrane has a first filtering hole communicated with the discharge hole, and is used for filtering air and water in the propellant slurry.

[0012] A kind of extrusion-type solid rocket motor charging system provided by the present invention, on one side of each layer of the first ultra-high molecular weight polyethylene membrane facing away from the slurry channel, a support plate is provided. The support plate is provided with a second filtering hole, and the second filtering hole is communicated with the first filtering hole.

[0013] A kind of extrusion-type solid rocket motor charging system provided by the present invention, on one side of each layer of the support plate facing away from the first ultra-high molecular weight polyethylene membrane, a second ultra-high molecular weight polyethylene membrane is provided. The second ultra-high molecular weight polyethylene membrane is provided with a third filtering hole, and the third filtering hole is communicated with the second filtering hole.

[0014] A kind of extrusion-type solid rocket motor charging system provided by the present invention, on one side of each layer of the second ultra-high molecular weight polyethylene membrane facing away from the support plate, a bearing plate is provided. The bearing plate is provided with a fourth filtering hole, and the fourth filtering hole is communicated with the third filtering hole.

[0015] A kind of extrusion-type solid rocket motor charging system provided by the present invention, multiple layers of the filtering structure are stacked inside the box body.

[0016] A kind of extrusion-type solid rocket motor charging system provided by the present invention, the extrusion device further includes: a non-metallic gasket, and the non-metallic gasket is arranged on the extrusion end face of the piston.

[0017] A kind of extrusion-type solid rocket motor charging system provided by the present invention, the extrusion device further includes:

[0018] A top cover, which is disposed on the top of the cylinder block in an openable and closable manner;

[0019] A driver, which is disposed on the top cover and connected to the piston, and is used to drive the piston to slide.

[0020] For an extrusion-type solid rocket motor charge system provided by the present invention, a feed inlet is provided at the bottom of the housing of the forming device. The feed inlet is connected to the second conveying pipeline, and a feed valve is provided at the feed inlet. An overflow port is provided at the top of the housing of the forming device. The overflow port is connected to a constant pressure device, and an overflow valve is provided at the overflow port.

[0021] The present invention also provides a method for using the above-mentioned extrusion-type solid rocket motor charge system, including:

[0022] Obtaining a charging instruction;

[0023] In response to the charging instruction, controlling the opening of the feed valve and the overflow valve, controlling the constant pressure device to maintain a constant pressure during the charging process, controlling the extrusion device to extrude and discharge the propellant slurry into the filtering device for air filtration, and discharging the propellant slurry after air filtration into the forming device until the forming device is filled with the propellant slurry, and controlling the closing of the overflow valve;

[0024] Controlling the extrusion device to continue to pressurize, determining that the pressure in the forming device reaches the target preset value, and controlling the closing of the feed valve.

[0025] The extrusion-type solid rocket motor charge system and the using method provided by the present invention include, but are not limited to, the following beneficial effects:

[0026] (1) The present invention uses an extrusion device to convey the propellant slurry in an extrusion manner, which is safe and efficient, and the filling speed and the amount of medicine are controllable, and it can solve the problem of low efficiency of the current casting method; and the extrusion device of the present invention is an integrated design of mixing and extrusion. After mixing, it can be directly charged, without the operation process of pouring the slurry in the mixing cylinder into the casting hopper in the related technology, saving the manual operation steps, which is beneficial to improving the efficiency and has better safety;

[0027] (2) The present invention uses an extrusion device to more easily realize the pressurized curing and forming of the propellant slurry, improve the interfacial bonding performance between the formed grain and the housing of the forming device, reduce the stress level caused by the curing of the grain, which is beneficial to improving the filling fraction of the combustion chamber, thereby improving the overall performance of the engine;

[0028] (3) The present invention uses a filtering device to discharge the residual air in the propellant slurry, reduce the internal pores of the grain, improve the quality of the engine, and eliminate the casting cylinder and vacuum pumping equipment in the traditional technology. The structure is simpler and the safety is better. In addition, there is no work in the preparation processes such as sealing the casting cylinder and vacuum pumping, the preparation period is short, and the production efficiency is higher.

[0029] (4) The system equipment of the present invention has a high degree of integration and low configuration requirements. The charging process can be integrated and operated on the ground, without a pit, without a casting cylinder, and without a vacuum pumping device. It can greatly simplify the ground equipment and operation process, reduce costs and improve efficiency. Moreover, the system of the present invention can realize mass production operation in a streamlined manner, which can effectively reduce costs. Brief Description of the Drawings

[0030] In order to more clearly illustrate the technical solutions in the present invention or related technologies, the following will briefly introduce the drawings required for use in the embodiments or related technology descriptions. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0031] Figure 1 It is a schematic structural diagram of an extrusion solid rocket motor charging system provided by the present invention;

[0032] Figure 2 It is a schematic structural diagram of a filtering device provided by the present invention;

[0033] Figure 3 It is a schematic internal structural diagram of a filtering device provided by the present invention;

[0034] Figure 4 It is a schematic diagram of a single-layer filtering structure provided by the present invention;

[0035] Figure 5 It is a schematic flow diagram of the usage method of an extrusion solid rocket motor charging system provided by the present invention.

[0036] Reference Signs:

[0037] 100: Extrusion device; 101: Cylinder block; 102: Piston; 103: Slurry outlet;

[0038] 104: Non-metallic gasket; 105: Top cover; 106: Flip hinge;

[0039] 107: Locking bolt; 108: Driver;

[0040] 200: Filtering device; 201: Box body; 202: Filtering structure;

[0041] 2021: The first ultra-high molecular weight polyethylene membrane; 2022: The slurry channel;

[0042] 2023: The first filter hole; 2024: The support plate; 2025: The second filter hole;

[0043] 2026: The second ultra-high molecular weight polyethylene membrane; 2027: The third filter hole;

[0044] 2028: The bearing plate; 2029: The fourth filter hole; 203: The inlet; 204: The outlet;

[0045] 205: The discharge hole; 206: The cover plate; 207: The locking lug;

[0046] 300: The forming device; 301: The housing; 302: The feed inlet; 303: The feed valve;

[0047] 304: The overflow port; 305: The constant pressure device; 306: The overflow valve; 307: The core mold;

[0048] 400: The first conveying pipeline; 500: The second conveying pipeline; 600: The first quick-release joint;

[0049] 700: The second quick-release joint; 800: The propellant slurry. Detailed implementation manners

[0050] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0051] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the embodiments of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0052] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

[0053] In the embodiments of the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0054] In the description of this specification, the descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments 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 a suitable manner in any one or more embodiments or examples. In addition, without conflict, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0055] The following Figures 1-5 describes the extrusion solid rocket motor charging system and its usage method of the present invention.

[0056] According to an embodiment of the first aspect of the present invention, as shown in Figures 1-4 the extrusion solid rocket motor charging system provided by the present invention mainly consists of three devices, including: an extrusion device 100, a filtering device 200, and a shaping device 300.

[0057] Among them, the extrusion device 100 includes: a cylinder block 101 and a piston 102. The cylinder block 101 is adapted to contain the propellant slurry 800, and the cylinder block 101 is provided with a slurry outlet 103, and the slurry outlet 103 can be specifically arranged at the bottom of the cylinder block 101; the piston 102 is slidably arranged in the cylinder block 101, and the piston 102 is adapted to extrude the propellant slurry 800 to be discharged through the slurry outlet 103. Specifically, by pushing the piston 102 to move, an extrusion force can be applied to the propellant slurry 800 in the cylinder block 101, so as to extrude the propellant slurry 800 at a predetermined speed.

[0058] The filtering device 200 is connected to the slurry outlet 103 of the cylinder block 101 through the first conveying pipeline 400, and is used for discharging the propellant slurry 800 and filtering the air in the propellant slurry 800. Specifically, the extrusion device 100 extrudes and conveys the propellant slurry 800 to the filtering device 200 through the first conveying pipeline 400, and the filtering device 200 filters the residual air mixed in the propellant slurry 800, which can avoid the formation of air holes by the residual air in the subsequent formed propellant column, thereby improving the quality of the engine.

[0059] The forming device 300 includes a housing 301. The housing 301 is the combustion chamber of the solid rocket motor. The combustion chamber is connected to the filtering device 200 through the second conveying pipeline 500, and is used for discharging the filtered air propellant slurry 800 through the extrusion device 100 and pressurizing and solidifying it. Specifically, the propellant slurry 800 filtered by the filtering device 200 continues to be conveyed along the second conveying pipeline 500 to the housing 301 of the forming device 300 under the extrusion action of the extrusion device 100 until the housing 301 is filled with the propellant slurry 800 to form a combustion chamber, and under the continuous pressure application of the extrusion device 100, the pressurized solidification of the propellant slurry 800 can be realized to form a solid propellant column. When the propellant slurry is solidified, the quality of the bonding interface can be guaranteed, and the stress level of the propellant itself can also be reduced, thereby effectively improving the overall performance of the engine.

[0060] The extrusion-type solid rocket motor charging system provided by the embodiments of the present invention conveys the propellant slurry in an extrusion manner by using an extrusion device, which is safe and efficient, with controllable filling speed and dosage, and is easier to achieve the pressurized curing and forming of the propellant slurry. It can improve the interfacial bonding performance between the formed grain and the housing of the forming device, reduce the stress level caused by grain curing, and is beneficial to improving the filling fraction of the combustion chamber, thereby improving the overall performance of the engine. The extrusion device of the present invention is an integrated design of mixing and extrusion. After mixing, it can be directly charged without the operation process of pouring the slurry in the mixing cylinder into the casting hopper in the related technology, eliminating the manual operation steps, which is beneficial to improving efficiency and has better safety. By using a filtering device, the residual air in the propellant slurry can be discharged, reducing the pores inside the grain, improving the quality of the engine, and eliminating the casting cylinder and vacuum pumping equipment in the traditional technology. The structure is simpler, the safety is better, and there is no work in the preparation processes such as sealing the casting cylinder and vacuum pumping. The preparation cycle is short and the production efficiency is higher. In addition, the system configuration requirements of the present invention are low. The charging process can be integrated and operated on the ground without a pit, a casting cylinder, or a vacuum pumping device, which can greatly simplify the ground equipment and operation process, reduce costs and improve efficiency. The system of the present invention can realize mass production operations in a streamlined manner, effectively reducing costs.

[0061] According to an embodiment of the present invention, referring to Figure 1 As shown, both ends of the first conveying pipeline 400 are respectively connected to the slurry outlet 103 of the extrusion device 100 and the feeding port 203 of the filtering device 200 through the first quick-release joint 600; and both ends of the second conveying pipeline 500 are respectively connected to the discharging port 204 of the filtering device 200 and the feeding port 302 of the forming device 300 through the second quick-release joint 700, which can realize the quick disassembly and assembly of the system, facilitate operation, and adapt to various working condition sites and streamlined operations. In addition, sealing members can be arranged at each connection to ensure the sealing performance of the system.

[0062] According to an embodiment of the present invention, referring to Figure 1 As shown, the extrusion device 100 further includes: a non-metallic gasket 104, and the non-metallic gasket 104 is arranged on the extrusion end surface of the piston 102. The extrusion end surface can be understood as the contact surface with the propellant slurry 800 in the cylinder block 101.

[0063] Among them, by setting the non-metallic gasket 104, the sealing effect can be ensured, thereby ensuring the extrusion effect; and the non-metallic gasket 104 can be a rubber part, which can avoid strong extrusion and friction with the metal cylinder block 101 during the extrusion process, and at the same time can avoid the contact between the metal piston 102 and the propellant slurry 800, thereby ensuring the safety of the extrusion process.

[0064] According to an embodiment of the present invention, referring to Figure 1As shown, the extrusion device 100 further includes: a top cover 105, which is disposed on the top of the cylinder block 101 in an openable and closable manner. When mixing materials, the top cover 105 is opened, and the propellant slurry components are put into the cylinder block 101 and stirred evenly. After the mixing is completed, the top cover 105 is closed for charging. Among them, the propellant slurry 800 generally consists of an oxidizer, a binder, a fuel, and a few other additive components.

[0065] For example, the cylinder block 101 is provided with a flipping hinge 106. One side of the top cover 105 is rotatably connected to the flipping hinge 106, and the other side of the top cover 105 is connected to the cylinder block 101 through a locking bolt 107. When material mixing is required, the locking bolt 107 is loosened to open the top cover 105. After the mixing is completed, the top cover 105 is closed and fastened through the locking bolt 107. And a seal is provided at the bottom edge of the top cover 105 to ensure the sealing performance with the cylinder block 101.

[0066] Also for example, the top cover 105 and the cylinder block 101 are connected by means of threaded connection or snap connection, etc.

[0067] According to an embodiment of the present invention, as shown in Figure 1 As shown, the extrusion device 100 further includes: a driver 108, which can be disposed on the top cover 105 or other mounting brackets, and the driver 108 is connected to the piston 102 for driving the piston 102 to reciprocate up and down.

[0068] The specific type of the driver 108 of the present invention is not particularly limited. For example, it can be a hydraulic cylinder, an electric push rod, or a pneumatic cylinder and other driving devices.

[0069] In the related art, during the charging process of a solid rocket motor using a casting molding process, due to the poor fluidity of the propellant slurry, unreasonable tooling design, or the failure to meet the expected requirements of the vacuum pumping conditions, the degassing of the propellant slurry mixing and casting processes is insufficient, which particularly easily causes pores of different sizes to exist inside the propellant slurry. Specifically, it includes: the air in the propellant slurry is generally entrapped during the repeated kneading and extrusion in the propellant mixing process and when the slurry flows when the slurry is poured from the mixing pot into the casting hopper after the mixing of the slurry is completed. The currently common process is to seal and evacuate the mixing pot during the propellant mixing process and evacuate the casting cylinder during the casting process for degassing. A Roots vacuum pump needs to be equipped, the equipment is complex, and the equipment needs to work continuously throughout the mixing and casting processes, which is very energy-consuming; the mixing pot and the casting cylinder need sealing measures, and they are pressure vessels during the working process, there are certain safety hazards; the vacuum degree needs to be monitored at all times during the working process, the process operation is cumbersome, if the vacuum degree fluctuates due to equipment failure or poor sealing during the equipment operation and the vacuum condition fails to meet the expectation, and the degassing is insufficient, then pores will be generated inside the subsequent formed grain.

[0070] Moreover, ammonium perchlorate, the oxidizer in the propellant component, is extremely prone to absorbing moisture in the air, resulting in a small amount of moisture often existing in the propellant slurry. During the curing process of the propellant slurry, the moisture in the propellant slurry reacts with the isocyanate groups of the curing agent to produce gas, leading to the generation of pores in the subsequent formed grain, thereby affecting the quality of the engine.

[0071] Research shows that the existence of pores inside the grain will cause the strain at the edge of the pores to exceed the maximum strain, breaking the structural integrity of the grain. At the same time, larger or more numerous pores will cause an abnormal increase in the burning surface during the ignition operation of the engine, affecting the internal ballistic performance of the engine, and even causing the engine to explode and disintegrate in severe cases.

[0072] To solve the above technical problems, an embodiment of the present invention further provides a propellant slurry filtering device. Referring to Figures 2-4 as shown, the filtering device 200 of the present invention includes: a box body 201 and at least one layer of filtering structure 202.

[0073] Among them, a feeding port 203 and a discharging port 204 are respectively provided at the left and right ends of the box body 201. The feeding port 203 is connected to the first conveying pipeline 400. The feeding port 203 is adapted to flow in the pressurized propellant slurry 800. The propellant slurry 800 flowing into the filtering device 200 through the first conveying pipeline 400 can have a certain pressure by means of the extrusion device 100; the discharging port 204 is connected to the second conveying pipeline 500. The discharging port 204 is adapted to discharge the propellant slurry 800 after filtering air and water. The filtered propellant slurry 800 can be discharged into the forming device 300 through the second conveying pipeline 500; and the box body 201 is provided with a discharge hole 205 for discharging the filtered air and water inside.

[0074] Referring to Figure 4 as shown, at least one layer of filtering structure 202 is arranged inside the box body 201. The filtering structure 202 includes: two layers of first ultra-high molecular weight polyethylene membranes 2021. A slurry channel 2022 is formed between the two layers of first ultra-high molecular weight polyethylene membranes 2021. The two ends of the slurry channel 2022 are respectively communicated with the feeding port 203 and the discharging port 204. And each layer of first ultra-high molecular weight polyethylene membrane 2021 has a first filtering hole 2023 communicated with the discharge hole 205 for filtering air and water in the propellant slurry 800.

[0075] Specifically, the propellant slurry 800 has high pressure through the extrusion device 100 and is extruded into the slurry channel 2022 from the feed port 203 of the filtering device 200. Under the action of pressure, the propellant slurry 800 is in full contact with the first ultra-high molecular weight polyethylene membrane 2021, and the air entrained in the propellant slurry 800 is filtered through the first filter holes 2023 of the first ultra-high molecular weight polyethylene membrane 2021 and then discharged through the discharge holes 205 on the box body 201. At the same time, due to the hydrophilicity of the ultra-high molecular weight polyethylene membrane, a small amount of moisture in the propellant slurry 800 is also absorbed and filtered out. The degassed and dewatered propellant slurry 800 is extruded and conveyed from the discharge port 204 of the filtering device 200 to the combustion chamber of the forming device 300 through the second conveying pipeline 500.

[0076] Among them, the cross-sectional shape and size of the slurry channel 2022 can be designed according to the fluidity of the slurry and the requirements for the pore size of the grain, without special restrictions.

[0077] It can be understood that in the embodiment of the present invention, the pressurized propellant slurry 800 flows through the slurry channel 2022 and contacts the ultra-high molecular weight polyethylene membrane, so as to achieve stable and automatic degassing. And the ultra-high molecular weight polyethylene membrane is used, which has the characteristics of hydrophilicity, chemical resistance, antistatic property, low friction coefficient and anti-adhesion. Among them, hydrophilicity helps to filter and absorb the moisture in the propellant slurry 800, further improving the internal quality of the grain and the interface bonding quality; chemical resistance means that it will not be corroded by the propellant slurry 800, improving the reliability and service life of the device; antistatic property makes the device safer; the low friction coefficient enables the propellant slurry 800 to flow smoothly through the slurry channel 2022 for degassing and will not be adhered to the surface of the slurry channel 2022, avoiding blocking the slurry channel 2022, thereby improving the reliability of the device.

[0078] Therefore, the filtering device 200 in the embodiment of the present invention can efficiently and stably degas the propellant slurry 800 automatically by using the ultra-high molecular weight polyethylene membrane. While ensuring the product quality of the solid rocket engine, it can also minimize the moisture in the propellant slurry 800 to further improve the product quality. And the filtering device 200 does not need to be equipped with a vacuum pump for vacuum pumping, the structure is simpler, the safety is better, there is no need to consider the vacuum degree fluctuation, and there is no need to monitor the vacuum degree all the time during the operation process, the process is simpler, and the workload of the operating personnel is reduced.

[0079] According to an embodiment of the present invention, with reference to Figure 4 As shown, on the side of each layer of the first ultra-high molecular weight polyethylene membrane 2021 facing away from the slurry channel 2022, there is a support plate 2024, and the support plate 2024 is provided with second filter holes 2025, and the second filter holes 2025 are communicated with the first filter holes 2023.

[0080] Since the propellant slurry 800 flowing through the slurry passage 2022 has pressure, by arranging a support plate 2024 on the back side of the first ultra-high molecular weight polyethylene membrane 2021, the first ultra-high molecular weight polyethylene membrane 2021 can be effectively supported, preventing the first ultra-high molecular weight polyethylene membrane 2021 from being damaged under pressure and increasing the service life of the filtering device 200. Also, by arranging second filtering holes 2025 on the support plate 2024, the discharge of air and water can be ensured, guaranteeing the reliability of the filtering device 200.

[0081] Moreover, to further enhance the supporting effect, the support plate 2024 can be made of a high-strength corrosion-resistant metal plate.

[0082] According to an embodiment of the present invention, as shown in Figure 4 a second ultra-high molecular weight polyethylene membrane 2026 is arranged on the side of each support plate 2024 facing away from the first ultra-high molecular weight polyethylene membrane 2021. The second ultra-high molecular weight polyethylene membrane 2026 is provided with third filtering holes 2027, and the third filtering holes 2027 communicate with the second filtering holes 2025.

[0083] Since the first ultra-high molecular weight polyethylene membrane 2021 is in direct contact with the pressurized propellant slurry 800, there is a possibility of damage after long-term use, which may affect the filtering effect. Therefore, by arranging the second ultra-high molecular weight polyethylene membrane 2026 on the back side of the support plate 2024, the filtering effect can be enhanced, and supplementary filtering can be carried out when the first ultra-high molecular weight polyethylene membrane 2021 is damaged, thus ensuring the filtering effect and effectively improving the reliability of the filtering device 200.

[0084] According to an embodiment of the present invention, as shown in Figure 4 a bearing plate 2028 is arranged on the side of each second ultra-high molecular weight polyethylene membrane 2026 facing away from the support plate 2024. The bearing plate 2028 is provided with fourth filtering holes 2029, and the fourth filtering holes 2029 communicate with the third filtering holes 2027.

[0085] In the embodiment of the present invention, by arranging the bearing plate 2028 on the outermost side of the filtering structure 202, a supporting effect can be exerted on the entire filtering membrane structure, thereby further protecting the multi-layer ultra-high molecular weight polyethylene membranes, preventing their damage, and increasing the service life of the device.

[0086] Moreover, to further enhance the pressure-bearing effect, the bearing plate 2028 can be made of a high-strength corrosion-resistant metal plate.

[0087] In addition, a plurality of discharge holes 205, first filtering holes 2023, second filtering holes 2025, third filtering holes 2027 and fourth filtering holes 2029 are arranged, which can effectively improve the filtering effect.

[0088] According to an embodiment of the present invention, with reference to Figure 3 As shown, multiple layers of filtering structures 202 are stacked inside the box body 201 to improve the filtering efficiency.

[0089] In a specific example, three layers of filtering structures 202 are embedded inside the filtering device 200. The propellant slurry 800 is squeezed and flows into three slurry channels 2022 from the feed inlet 203, and is divided into a certain thickness to contact with multiple layers of ultra-high molecular weight polyethylene membranes, filtering the air and water in the propellant slurry 800. The filtered air and water are discharged from the discharge holes 205 of the box body 201 through the corresponding filtering holes, and the filtered propellant slurry 800 is discharged from the discharge outlet 204.

[0090] According to an embodiment of the present invention, at least one side of the opposite sides of the box body 201 along the filtering direction of the filtering structure 202 is provided with a discharge hole 205. For example, when the filtering structure 202 is horizontally placed, the upper side and / or the lower side of the box body 201 are provided with discharge holes 205, or when the filtering structure 202 is vertically arranged, the front side and / or the rear side of the box body 201 are provided with discharge holes 205. Among them, the filtering direction can be understood as the direction in which air and water flow out through the discharge holes 205, and reference can be made to Figure 4 the directions indicated by the upper and lower arrows in

[0091] And, with reference to Figure 2 As shown, the box body 201 is detachably provided with a cover plate 206, and the cover plate 206 is provided with a discharge hole 205. Through the detachable cover plate 206, the installation and replacement of the filtering structure 202 inside the box body 201 can be facilitated.

[0092] In addition, when the cover plate 206 is arranged on the front side and / or the rear side of the box body 201, the cover plate 206 is provided with locking lugs 207, and the box body 201 is provided with a locking rod, and the locking rod is connected to the locking lugs 207 through fasteners such as bolts to realize the detachable assembly of the cover plate 206 and the box body 201. Of course, connection methods such as snap connection can also be adopted.

[0093] Continuing to refer to Figure 1 As shown, a general introduction to the molding device 300 of the present invention is made. A feed inlet 302 is provided at the bottom of the housing 301 of the molding device 300 of the present invention. The feed inlet 302 is connected to the second conveying pipeline 500, and a feed valve 303 is provided at the feed inlet 302; and an overflow port 304 is provided at the top of the housing 301 of the molding device 300. The overflow port 304 is connected to a constant pressure device 305, and an overflow valve 306 is provided at the overflow port 304. Through the constant pressure device 305, the pressure during the charging process can be ensured to be constant to perform uniform charging, thereby improving the safety and stability of the system, and the pressurization and curing process of the propellant slurry 800 can be controlled through the cooperation of the feed valve 303 and the overflow valve 306. For specific details, refer to the following description.

[0094] There is no special limitation on the specific type of the constant pressure device 305 of the present invention. For example, the constant pressure device 305 includes a buffer tank and a pressure sensor. The buffer tank is connected to the overflow port 304 of the forming device 300. A pressure compensation valve and a pressure relief valve are provided on the buffer tank. The pressure sensor is arranged inside the buffer tank and is used to detect the pressure inside the buffer tank. When the pressure inside the buffer tank deviates from the set pressure value, pressure is increased through the pressure compensation valve or decreased through the pressure relief valve to keep the pressure stable.

[0095] Moreover, a core mold 307 arranged along the height direction is provided at the center inside the housing 301 of the forming device 300, and is used to form the propellant slurry 800 into a hollow cylindrical grain.

[0096] In addition, a liquid level sensor is further provided at the top of the housing 301 of the forming device 300 and is used to detect the amount of the propellant slurry inside the forming device 300; a pressure sensor is also provided inside the housing of the forming device 300 and is used to detect the pressure inside the forming device 300.

[0097] The usage method of the extrusion-type solid rocket motor charging system provided by the present invention will be described below. The usage method of the extrusion-type solid rocket motor charging system described below can be mutually corresponding and referred to with the extrusion-type solid rocket motor charging system described above.

[0098] Refer to Figure 5 As shown, the usage method of the extrusion-type solid rocket motor charging system of the present invention mainly includes:

[0099] S100. Obtain a charging instruction.

[0100] S200. In response to the charging instruction, control the opening of the feed valve 303 and the overflow valve 306, and control the constant pressure device 305 to keep the pressure constant during the charging process. Control the extrusion device 100 to extrude and discharge the propellant slurry 800 into the filtering device 200 for air filtration, and discharge the propellant slurry 800 after air filtration into the forming device 300 until the forming device 300 is filled with the propellant slurry 800, and then control the overflow valve 306 to close.

[0101] S300. Control the extrusion device 100 to continue pressurizing until it is determined that the pressure inside the forming device 300 reaches the target preset value, and then control the feed valve 303 to close.

[0102] Among them, when the filtering device 200 uses an ultra-high molecular weight polyethylene membrane, it can also filter the water in the propellant slurry 800. The filtered propellant slurry 800 is formed in the housing 301 of the forming device 300 according to a preset mandrel 307. After the filling of the propellant slurry 800 is completed, the overflow valve 306 is closed, and the extrusion device 100 continues to work to ensure the working pressure. At this time, an internal pressure will be formed in the housing 301 of the forming device 300. When the internal pressure reaches the set target pressure value, generally 1 Mpa, the feed valve 303 is closed to complete the pressurized curing process of the propellant slurry, forming a solid propellant column, thereby completing the charging of one engine combustion chamber. Then, the quick-release joint can be removed to charge the next engine combustion chamber.

[0103] It can be understood that since the propellant curing is a shrinking process, pressurized curing applies a certain pressure to the propellant slurry 800 in the housing 301. When the propellant slurry 800 is cured, it can ensure the quality of the bonding interface between the formed propellant column and the combustion chamber, and can also reduce the stress level of the propellant column itself, thereby improving the overall performance of the engine.

[0104] Therefore, for the method of using the extrusion-type solid rocket motor charging system provided by the embodiments of the present invention, the filling speed and the amount of medicine are controllable, the pressurized curing process is simple and has good effects, and there is no need for the operation process of pouring the medicine slurry in the mixing cylinder into the casting hopper in the related technology, nor the preparation work such as sealing the casting cylinder and evacuating in the preparation process. The preparation cycle is short and the production efficiency is higher.

[0105] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An extrusion solid rocket motor charge system, characterized in that Comprising: An extrusion device, comprising: a cylinder body and a piston, the cylinder body being adapted to contain a propellant slurry and provided with a slurry outlet, the piston being slidably disposed within the cylinder body and adapted to extrude the propellant slurry to be discharged through the slurry outlet; A filtering device, the filtering device being connected to the slurry outlet of the cylinder body via a first conveying pipeline, for discharging the propellant slurry and filtering air in the propellant slurry; A forming device, comprising a housing, the housing being a combustion chamber of a solid rocket motor, the combustion chamber being connected to the filtering device via a second conveying pipeline, for discharging the propellant slurry after filtering air through the extrusion device and pressurizing and curing it into a shape.

2. The extrusion solid motor charge system according to claim 1, characterized in that, The filtering device comprises: A box body, provided with a feeding port and a discharging port, the feeding port being connected to the first conveying pipeline, the discharging port being connected to the second conveying pipeline, and the box body being provided with discharge holes; At least one layer of filtering structure, disposed within the box body, the filtering structure comprising: two layers of first ultra-high molecular weight polyethylene membranes, a slurry channel being formed between the two layers of first ultra-high molecular weight polyethylene membranes, two ends of the slurry channel being respectively communicated with the feeding port and the discharging port, and each layer of first ultra-high molecular weight polyethylene membrane having first filtering holes communicated with the discharge holes, for filtering air and water in the propellant slurry.

3. The extrusion-type solid motor charge system according to claim 2, wherein On one side of each layer of first ultra-high molecular weight polyethylene membrane facing away from the slurry channel, there is provided a support plate, the support plate being provided with second filtering holes, the second filtering holes being communicated with the first filtering holes.

4. The extrusion solid rocket motor charge system according to claim 3, characterized in that, On one side of each layer of support plate facing away from the first ultra-high molecular weight polyethylene membrane, there is provided a second ultra-high molecular weight polyethylene membrane, the second ultra-high molecular weight polyethylene membrane being provided with third filtering holes, the third filtering holes being communicated with the second filtering holes.

5. The extrusion solid motor charge system according to claim 4, wherein On one side of each layer of second ultra-high molecular weight polyethylene membrane facing away from the support plate, there is provided a bearing plate, the bearing plate being provided with fourth filtering holes, the fourth filtering holes being communicated with the third filtering holes.

6. The extrusion solid motor charge system according to any one of claims 2-5, characterized in that, Multiple layers of the filtering structure are stacked within the box body.

7. The extrusion solid motor charge system according to any one of claims 1-5, characterized in that, The extrusion device further comprises: a non-metallic gasket, the non-metallic gasket being disposed on the extrusion end face of the piston.

8. The extrusion solid motor charge system according to claim 7, characterized in that The extrusion device further comprises: A top cover, the top cover being openably and closably disposed on the top of the cylinder body; A driver, disposed on the top cover and connected to the piston, for driving the piston to slide.

9. The extrusion solid rocket motor charge system according to any one of claims 1-5, characterized in that, At the bottom of the housing of the forming device, there is provided a feeding port, the feeding port being connected to the second conveying pipeline, the feeding port being provided with a feeding valve, at the top of the housing of the forming device, there is provided an overflow port, the overflow port being connected to a constant pressure device, and the overflow port being provided with an overflow valve.

10. A method for using an extrusion solid rocket motor charge system according to claim 9, characterized in that, Comprising: Obtaining a charging instruction; In response to the charging instruction, controlling the feeding valve and the overflow valve to open, and controlling the constant pressure device to maintain a constant pressure during the charging process, controlling the extrusion device to extrude and discharge the propellant slurry into the filtering device for air filtration, and discharging the propellant slurry after filtering air into the forming device until the forming device is filled with the propellant slurry, and controlling the overflow valve to close; Control the extrusion device to continue pressurizing, determine that the pressure in the forming device reaches the target preset value, and control the feed valve to close.

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