Solid rocket motor grain and insulation layer combined cleaning nozzle and cleaning method

Abstract

The application discloses a solid rocket engine grain and heat insulation layer combined cleaning nozzle and a cleaning method. The solid rocket engine grain and heat insulation layer combined cleaning nozzle comprises a nozzle mounting frame and a plurality of high-pressure water jet nozzles arranged on the nozzle mounting frame. The high-pressure water jet nozzles are arranged at intervals, and part or all of the high-pressure water jet nozzles are installed on the nozzle mounting frame through nozzle transition rods, so that the distance between all the high-pressure water jet nozzles and the grain and heat insulation layer relative to the optimal target distance of the high-pressure water jet nozzle is near the optimal target distance. The application fully utilizes the high-efficiency target distance of water jet cleaning, combines the optimal target distances of different nozzles, and can realize high-efficiency and rapid cleaning of engine cylinder sections and end cover sections of different sizes, solves the problem of nozzle target distance adaptability, and does not need to repeatedly replace the nozzle during the cleaning process, thereby effectively utilizing the high-efficiency cleaning section of the water jet.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of cleaning equipment, and particularly relates to a solid rocket engine grain and thermal insulation layer cleaning equipment and a cleaning method. BACKGROUND

[0002] With the extension of the storage time of the solid rocket, the propellant is prone to aging, which poses a major safety hazard and environmental problem, and thus needs to be disposed of, the grain and the thermal insulation layer are cleaned, and the solid rocket engine is recycled. The grain and the thermal insulation layer are usually cleaned by using a conventional physical stripping method, and the ammunition and the projectile body are separated by crushing, which may cause ammunition reaction and heat release, and the reaction of the ammunition may result in emission of harmful gases and generation of solid-liquid waste, thereby threatening the environment.

[0003] The high-pressure water jet cleaning of the solid rocket engine charge is achieved by spraying high-pressure water jet on the surface of the solid propellant, the coating layer and the thermal insulation layer, so as to cut and clean the solid propellant, the coating layer and the thermal insulation layer. Compared with the traditional physical stripping method, the high-pressure water jet cleaning is safe and reliable, and the danger is greatly reduced.

[0004] However, the action distance of the water jet is limited during the water jet cleaning process, and it is difficult to clean the solid propellant of the large-size solid rocket engine due to the large diameter and size of the engine. The nozzle needs to be repeatedly replaced to change the target distance during the cleaning process, thereby reducing the cleaning efficiency. The use of a complex adjustment structure can change the target distance of the nozzle, but increases the load at the end of the spray gun. Since the spray gun adopts a cantilever structure, the vibration of the spray gun is greatly increased, and the vibration of the nozzle at the end may cause collision between the nozzle and the inner wall of the rocket engine, thereby causing quality problems. Meanwhile, the combustion chamber shell of some rocket engines not only includes a cylindrical barrel segment, but also includes a head segment arranged at both ends of the barrel segment. The irregular head segment also increases the difficulty of cleaning the rocket engine. SUMMARY

[0005] The technical problem to be solved by the present application is to overcome the deficiencies and defects mentioned in the background, and to provide a combined cleaning nozzle for solid rocket engine grain and thermal insulation layer and a cleaning method. The combined cleaning nozzle and the cleaning method make full use of the high-efficiency target distance of the water jet cleaning, combine the optimal target distances of different nozzles, and can realize efficient and rapid cleaning of different sizes of engine barrel segments and head segments. The problem of nozzle target distance adaptability is solved, and the cleaning process does not need to repeatedly replace the nozzle, thereby effectively utilizing the high-efficiency cleaning section of the water jet.

[0006] To solve the above technical problems, the technical solution provided by the present application is as follows:

[0007] A solid rocket engine grain and insulation layer combined cleaning nozzle, comprising a nozzle mounting frame and a plurality of high-pressure water jet nozzles arranged on the nozzle mounting frame, the high-pressure water jet nozzles are arranged at intervals, and part or all of the high-pressure water jet nozzles are installed on the nozzle mounting frame through nozzle transition rods, so that the distance between all the high-pressure water jet nozzles and the grain and insulation layer they act on is near the optimal target distance of the high-pressure water jet nozzle. The optimal target distance of the high-pressure water jet nozzle is related to the nozzle type.

[0008] In the above combined cleaning nozzle, preferably, the distance between the high-pressure water jet nozzle and the grain and insulation layer it acts on is 0.5-1.5 times the optimal target distance of the high-pressure water jet nozzle.

[0009] In the above combined cleaning nozzle, preferably, when cleaning the grain, the length L1 of the nozzle transition rod of the first group of high-pressure water jet nozzles located at the front end of the travel direction of the nozzle mounting frame meets the following requirements: L1=R1-D1-(D / 2), where the inner hole radius of the grain is R1, the length of the high-pressure water jet nozzle is D1, and the optimal target distance of the high-pressure water jet nozzle is D; the length L2 of the nozzle transition rod of the second group of high-pressure water jet nozzles located at the front end of the travel direction meets the following requirements: L2=L1+D; and so on, the length L N of the nozzle transition rod of the Nth group of high-pressure water jet nozzles located at the last end of the travel direction meets the following requirements: L N = N-1 +D.

[0010] The purpose of the above arrangement is to ensure that the high-pressure water jet nozzle is within the optimal cleaning target distance segment, and as the grain changes during cleaning, the target distance of the high-pressure water jet nozzle is ensured to be within the range of 0.5D-1.5D. Generally, the grain is thick, and the theoretical optimal target distance of the cutting nozzle is about 5-10 mm (this data is different for different nozzles, but the optimal target distance of cutting is very low). During cleaning, the rocket engine rotates, and the nozzle mounting frame advances along the rotation axis of the rocket engine, and the advancing speed is determined according to the cleaning effect, so that the cleaning of the grain is always within the range of 0.5D-1.5D between the nozzle and the grain. See the schematic Figure 4 The target distance of the first nozzle = R1-L1-D1 = D / 2, and the target distance is expanded to 1.5D during cleaning, and as the nozzle mounting frame gradually advances, the grain at the position ≥1.5D behind is cleaned by the second nozzle, and so on.

[0011] In the above combined cleaning nozzle, preferably, the number N of the arranged groups of high-pressure water jet nozzles needs to meet the following requirements at the same time:

[0012] Wherein, Q1 is the working flow of a single high-pressure water jet nozzle, Q is the rated flow of the high-pressure pump, and one pair of the high-pressure water jet nozzles is arranged in each group;

[0013] D / 2≤the distance between the Nth group of high-pressure water jet nozzles at the last end of the traveling direction and the propellant grain≤D.

[0014] The number of groups N of the high-pressure water jet nozzles needs to consider the rated flow of the high-pressure pump for providing high-pressure jet water, and also needs to consider the thickness and inner diameter of the propellant grain. First, the working flow of a single nozzle needs to meet the requirements, at which time the upper limit of the number of nozzles can be determined. If the rated flow of the high-pressure pump is high, theoretically, more nozzles are allowed to be used, but when too many nozzles are used, the subsequent nozzles need to be increased to a too long nozzle transition rod to ensure that they are near the optimal stand-off distance, which will cause the nozzles to collide with the propellant grain / heat insulation layer, and this situation needs to be avoided. Therefore, when considering the rated flow of the high-pressure pump, the matching of the nozzle transition rod and the inner diameter of the propellant grain needs to be considered. If the propellant grain is too thick, the nozzles determined according to the above conditions cannot clean all the propellant grains, and the nozzle transition rod can be changed, and the nozzles, cleaning pressure, and other conditions can be changed to clean the propellant grain again.

[0015] In the combined cleaning nozzle, preferably, when cleaning the heat insulation layer, for the cylindrical barrel section without diameter change, the lengths of the nozzle transition rods of all the high-pressure water jet nozzles are equal, and the length L of the nozzle transition rod satisfies the following requirement: L=R2-D1-(D / 2), wherein R2 is the inner hole radius of the heat insulation layer, D1 is the length of the high-pressure water jet nozzle, and D is the optimal stand-off distance of the high-pressure water jet nozzle. J The length L of the nozzle transition rod satisfies the following requirement: L=R2-D1-(D / 2). J The length L of the nozzle transition rod satisfies the following requirement: L=R2-D1-(D / 2). The length L of the nozzle transition rod satisfies the following requirement: L=R2-D1-(D / 2).

[0016] In the combined cleaning nozzle, preferably, the end of the solid rocket engine includes a head section with diameter change. For cleaning the heat insulation layer at the head section with diameter change, along the traveling direction of the nozzle mounting frame, the length K1 of the nozzle transition rod equipped for the first group of high-pressure water jet nozzles at the front end of the traveling direction satisfies the following requirement: K1=R3-D1-(D / 2), wherein R3 is the minimum inner hole radius of the head section, D1 is the length of the high-pressure water jet nozzle, and D is the optimal stand-off distance of the high-pressure water jet nozzle; the length K2 of the nozzle transition rod equipped for the second group of high-pressure water jet nozzles at the front end of the traveling direction satisfies the following requirement: K2=K1+D; and so on, the length K N The length KN =K N-1 +D. For solid rocket motors with end caps that have varying diameters, the insulation layer in this section is difficult to clean using conventional high-pressure water jet nozzles. The combined cleaning nozzle of this invention, through optimized target spacing of each nozzle, is particularly suitable for cleaning the insulation layer of this end cap section. Regarding the number of nozzles for cleaning the insulation layer of the end cap section, since the end cap section is usually short, the number of nozzles does not need to be excessive and can be determined according to the actual situation.

[0017] In the above-mentioned combined cleaning nozzle, preferably, the high-pressure water jet nozzles are arranged in pairs at intervals on the nozzle mounting frame, the distance between adjacent high-pressure water jet nozzles is 50-100mm, and the pair of high-pressure water jet nozzles are symmetrically arranged along the axial direction of the nozzle mounting frame.

[0018] In the above-mentioned combined cleaning nozzles, preferably, multiple pairs of high-pressure water jet nozzles are staggered, and the included angle between adjacent high-pressure water jet nozzles in the staggered arrangement is 30°-60°.

[0019] The interior of a rocket engine is narrow, and when there is a tapered end, the nozzle mounting bracket needs to be extended into the rocket engine. The purpose of the spaced and staggered arrangement is to install as many nozzles as possible in the most compact distance (determined by the welding distance) under the conditions that allow, while also facilitating disassembly.

[0020] As a general technical concept, the present invention also provides a method for cleaning solid rocket motor propellant grains and insulation layers using the above-mentioned combined cleaning nozzle, comprising the following steps:

[0021] S1: Install some or all of the high-pressure water jet nozzles on the nozzle mounting bracket via a nozzle transition rod, so that the distance between all the high-pressure water jet nozzles and the propellant they act upon is near the optimal target distance of the high-pressure water jet nozzles.

[0022] S2: Slowly rotate the solid rocket motor along the centerline, and insert the combined cleaning nozzle from the end with the larger opening of the solid rocket motor. Move forward along the centerline of the solid rocket motor with the forward speed matching the cleaning effect to complete the cleaning of the propellant grain.

[0023] S3: Remove the combined cleaning nozzle from the solid rocket motor and replace the nozzle transition rod so that the distance between all the high-pressure water jet nozzles and the insulation layer they act on is near the optimal target distance of the high-pressure water jet nozzles.

[0024] S4: Slowly rotating the solid rocket engine along the center line, entering the combined cleaning nozzle from the end of the solid rocket engine opening, moving forward along the center line of the solid rocket engine, the forward speed matches the cleaning effect, and the cleaning of the insulating layer is completed.

[0025] The present application aims at the problems of the existing water jet technology cleaning the solid rocket engine grain and insulating layer, such as narrow cleaning range of single nozzle, low cleaning efficiency, repeated replacement of nozzle in the cleaning process, and complex structure of the end section, and proposes a combined cleaning nozzle for the solid rocket engine grain and insulating layer. The nozzle fully utilizes the high efficient target distance of water jet cleaning, combines the optimal target distance of different nozzles, can realize efficient and rapid cleaning of different size engine cylinder sections and end sections, solves the problem of nozzle target distance adaptability, and effectively utilizes the high efficient cleaning section of water jet in the cleaning process.

[0026] The combined cleaning nozzle for the solid rocket engine grain and insulating layer of the present application can specifically include a nozzle mounting frame, a high-pressure water jet nozzle, a nozzle transition rod, and a mounting frame connecting thread. More specific examples are as follows:

[0027] Along the feeding direction of the spray gun, an even number of nozzle transition rod mounting ports are opened in the nozzle mounting frame, the nozzle transition rod mounting ports are arranged in pairs at the center position of the nozzle mounting frame and are symmetrically arranged, the high-pressure water jet nozzle at the most front end (closest to the grain) along the feeding direction is the first group of nozzles, the rear side of the first group of nozzles is the second group of nozzles (second closest to the grain), and so on. The nozzle transition rod mounting port is installed on the nozzle mounting frame in the form of welding. Considering the actual welding condition, the axial spacing of the nozzle transition rod mounting port is 50mm.

[0028] The combined cleaning nozzle is a cantilever structure, and if the vibration of the end is too large, it will cause vibration of the whole nozzle. Considering that the target distance is very small, too large vibration will cause the nozzle to hit the inner wall of the rocket engine, damage the engine, and possibly produce sparks and cause explosion. The even number of nozzles arranged in pairs can offset the water jet vibration.

[0029] The first group of nozzles is horizontally arranged when installed, the axis of the nozzle transition rod installation port of the second group of nozzles is at an angle of 30° with the axis of the nozzle transition rod installation port of the first group of nozzles, and the end of the nozzle transition rod is installed with a high-pressure water jet nozzle; the size of the nozzle transition rod is determined according to the model of the rocket engine, the inner hole radius of the grain is R1, the length of the high-pressure water jet nozzle is D1, the optimal target distance of the high-pressure water jet nozzle is D, and the pressure of the high-pressure water jet when cleaning the grain is 15 MPa, so the length L1 of the first group of nozzle transition rods satisfies the following requirements: L1=R1-D1-(D / 2); the length L2 of the second group of nozzle transition rods satisfies the following requirements: L2=L1+D; the axis of the nozzle transition rod installation port of the third group of nozzles is at an angle of-30° with the axis of the nozzle transition rod installation port of the first group of nozzles, and the length of the third group of nozzle transition rods is: L3=L2+D. The length of the transition rod of the subsequent group is the length of the transition rod of the previous group plus the optimal target distance D, and presents a gradient change. If subsequent nozzles are continuously arranged, the axis of the nozzle transition rod installation port of the fourth group of nozzles is at an angle of 60° with the axis of the nozzle transition rod installation port of the first group of nozzles, and the length of the fourth group of nozzle transition rods is: L4=L3+D; and so on, and the length L N of the nozzle transition rod of the Nth group of high-pressure water jet nozzles located at the last end in the direction of travel satisfies the following requirements: L N = N-1 +D. The number of nozzles of the combined cleaning nozzle is set according to the flow rate of the high-pressure pump, the thickness of the grain, etc. Within the flow rate range, the number of nozzles is arranged under the condition that: D / 2≤the distance between the Nth group of high-pressure water jet nozzles located at the last end in the direction of travel and the grain≤D.

[0030] When cleaning the grain, the number of nozzles of the combined cleaning nozzle is set according to the flow rate of the high-pressure pump, the thickness of the grain, etc. The solid rocket engine slowly rotates along the center line, the combined cleaning nozzle enters from the end with a large opening of the solid rocket engine, moves forward along the center line of the solid rocket engine, the forward speed is matched with the cleaning effect, the optimal target distance of the water jet is effectively utilized, and the cleaning efficiency is improved.

[0031] When cleaning the heat insulation layer, for a cylindrical barrel section without diameter change, the nozzle transition rods of multiple groups of nozzles can be arranged with the same length, the inner hole radius of the heat insulation layer is R2, the length of the high-pressure water jet nozzle is D1, the optimal target distance of the high-pressure water jet nozzle is D, and the pressure of the high-pressure water jet when cleaning the heat insulation layer is 35 MPa, so the length L J of the nozzle transition rod satisfies the following requirements: L J =R2-D1-(D / 2), multiple groups of nozzles can be arranged with the same nozzle transition rod, and the combined cleaning nozzle can reciprocate in the interior of the rocket engine.

[0032] When cleaning the insulation layer, for end cap sections with varying diameters (the diameter of the end cap section changes rapidly; to ensure cleaning efficiency, the target distance range must be guaranteed, ensuring that different diameter sections of the end cap section correspond to the optimal cleaning range), the minimum inner radius of the end cap section is R3, the length of the high-pressure water jet nozzle is D1, the optimal target distance of the high-pressure water jet nozzle is D, and the high-pressure water jet pressure during insulation layer cleaning is 35MPa, then the length K1 of the first group of nozzle transition rods satisfies the following requirement: K1=R3-D1-(D / 2), and the length K2 of the second group of nozzle transition rods satisfies the following requirement: K2=K1+D; and so on, the length K of the nozzle transition rod of the Nth group of high-pressure water jet nozzles located at the rear end of the travel direction is... N The following requirements must be met: K N =K N-1 +D. Considering the short length of the end cap section, the number of nozzle sets depends on the specific situation. If the end cap section affects the access of the combined cleaning nozzles to the solid rocket motor cavity for cleaning, the nozzle mounting bracket can be extended into the solid rocket motor cavity first, and then the nozzle transition rod and high-pressure water jet nozzle can be installed.

[0033] Compared with the prior art, the advantages of the present invention are as follows:

[0034] The solid rocket motor propellant grain and insulation layer combined cleaning nozzle of the present invention solves the problem of low efficiency due to fixed target distance in the original water jet cleaning process by optimizing the target distance combination of different high-pressure water jet nozzles according to different rocket motor sizes, under the condition that the high-pressure pump allows. The combination of high-pressure water jet nozzles with different target distances ensures that the cleaning process is carried out at a better target distance, which greatly improves the efficiency of the cleaning process and reduces the replacement frequency of high-pressure water jet nozzles.

[0035] The solid rocket motor propellant grain and insulation layer combined cleaning nozzle of the present invention has a simple structure, light weight, low production cost, simple manufacturing, flexible combination, and high energy utilization rate. It can be customized according to rocket motors of different diameters (only the nozzle transition rod needs to be machined), thereby greatly improving the cleaning efficiency.

[0036] The solid rocket motor propellant and insulation layer combined cleaning nozzle of this invention can perform targeted cleaning for different rocket motors, and even different materials and structures. For example, for propellant cleaning, the nozzle group of multi-target-distance high-pressure water jet nozzles ensures that the propellant is always within the optimal target distance range during the cleaning process, greatly improving cleaning efficiency; for insulation layer cleaning, multiple high-pressure water jet nozzles maintain the same optimal target distance, greatly improving cleaning efficiency and saving time; for sealing section cleaning, the nozzle group of multi-target-distance high-pressure water jet nozzles can meet the sealing section cleaning requirements by setting the target distance once, improving cleaning efficiency. Attached Figure Description

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative effort.

[0038] Figure 1 Structure diagram of the combined cleaning nozzle for cleaning the propellant grain.

[0039] Figure 2 Structure diagram of the combined cleaning nozzle for cleaning the propellant grain.

[0040] Figure 3 Structure diagram of the combined cleaning nozzle for cleaning the insulating layer.

[0041] Figure 4 Structure diagram of the combined cleaning nozzle for cleaning the propellant grain.

[0042] Figure 5 Structure diagram of the solid rocket engine.

[0043] Legend

[0044] 1, nozzle mounting frame; 2, high-pressure water jet nozzle; 3, nozzle transition rod; 7, outer wall of solid rocket engine; 8, insulating layer; 9, propellant grain. DETAILED DESCRIPTION

[0045] In order to facilitate the understanding of the present application, the following will combine the drawings in the specification and the preferred embodiments to make a more comprehensive and detailed description of the present application, but the protection scope of the present application is not limited to the following specific embodiments.

[0046] It should be particularly noted that when a certain element is described as "fixed to, fixedly connected to, connected to or communicated to" another element, it can be directly fixed, fixedly connected, connected or communicated to another element, or indirectly fixed, fixedly connected, connected or communicated to another element through other intermediate connecting elements.

[0047] Unless otherwise defined, all the professional terms used in the following are the same as those commonly understood by those skilled in the art. The professional terms used in this paper are only for the purpose of describing specific embodiments and are not intended to limit the protection scope of the present application.

[0048] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present application can be purchased from the market or can be prepared by existing methods.

[0049] Embodiment:

[0050] As Figure 1 shown in the figure, the solid rocket engine grain and the heat insulation layer combination cleaning nozzle of the present embodiment comprises a nozzle mounting frame 1 and 8 high-pressure water jet nozzles 2 arranged on the nozzle mounting frame 1, the high-pressure water jet nozzles 2 are arranged in pairs and spaced on the nozzle mounting frame 1, the spacing between the adjacent high-pressure water jet nozzles 2 arranged in pairs is 50mm, and a pair of high-pressure water jet nozzles 2 are arranged axially symmetrically along the nozzle mounting frame 1, 4 pairs of high-pressure water jet nozzles 2 are arranged staggered, and the included angle between the adjacent high-pressure water jet nozzles 2 arranged staggered is 30°. Part or all of the high-pressure water jet nozzles 2 are installed on the nozzle mounting frame 1 through nozzle transition rods 3, so that the distance between all high-pressure water jet nozzles 2 and the grain 9 and the heat insulation layer 8 they act on is near the optimal target distance of the high-pressure water jet nozzles 2, specifically, the distance between the high-pressure water jet nozzles 2 and the grain 9 and the heat insulation layer 8 they act on is 0.5-1.5 times the optimal target distance of the high-pressure water jet nozzles 2.

[0051] In the present embodiment, when cleaning the grain 9, the length L1 of the nozzle transition rod 3 equipped for the first group of high-pressure water jet nozzles 2 located at the front end in the advancing direction of the nozzle mounting frame 1 meets the following requirements: L1=R1-D1-(D / 2), wherein the inner hole radius of the grain 9 is R1, the length of the high-pressure water jet nozzle 2 is D1, and the optimal target distance of the high-pressure water jet nozzle 2 is D; the length L2 of the nozzle transition rod 3 equipped for the second group of high-pressure water jet nozzles 2 located at the front end in the advancing direction meets the following requirements: L2=L1+D; and so on, the length L N of the nozzle transition rod 3 equipped for the Nth group of high-pressure water jet nozzles 2 located at the last end in the advancing direction meets the following requirements: L N = L N-1 +D.

[0052] In the present embodiment, the number N of groups of high-pressure water jet nozzles 2 needs to meet the following requirements at the same time:

[0053] , wherein Q1 is the working flow of a single high-pressure water jet nozzle 2, Q is the rated flow of the high-pressure pump, and one pair of high-pressure water jet nozzles 2 is arranged in each group;

[0054] D / 2≤the distance between the Nth group of high-pressure water jet nozzles 2 located at the last end in the advancing direction and the grain 9≤D.

[0055] In the present embodiment, when cleaning the heat insulation layer 8, for a cylindrical section without diameter change, the lengths of the nozzle transition rods 3 of all high-pressure water jet nozzles 2 are equal, and the length L J of the nozzle transition rod 3 meets the following requirements: L J=R2-D1-(D / 2), where the inner radius of the insulation layer 8 is R2, the length of the high-pressure water jet nozzle 2 is D1, and the optimal target distance of the high-pressure water jet nozzle 2 is D.

[0056] In this embodiment, the solid rocket motor end cap includes a section with a varying diameter. For cleaning the insulation layer 8 at the section with the varying diameter, along the travel direction of the nozzle mounting bracket 1, the length K1 of the nozzle transition rod 3 of the first group of high-pressure water jet nozzles 2 located at the front end of the travel direction satisfies the following requirement: K1 = R3 - D1 - (D / 2), where the minimum radius of the inner hole of the end cap is R3, the length of the high-pressure water jet nozzle 2 is D1, and the optimal target distance of the high-pressure water jet nozzle 2 is D. The length K2 of the nozzle transition rod 3 of the second group of high-pressure water jet nozzles 2 located at the front end of the travel direction satisfies the following requirement: K2 = K1 + D; and so on, the length K of the nozzle transition rod 3 of the Nth group of high-pressure water jet nozzles 2 located at the rear end of the travel direction... N The following requirements must be met: K N =K N-1 +D.

[0057] like Figures 2-5 As shown, the combined cleaning nozzle for solid rocket motor propellant grains and insulation layer in this embodiment is used for cleaning the solid rocket motor propellant grains and insulation layer. The structure of the solid rocket motor is as follows: Figure 5 As shown, the solid rocket motor includes a solid rocket motor outer wall 7, a heat insulation layer 8, and a propellant grain 9. The solid rocket motor also includes a head section with varying diameter. The cleaning method includes the following steps:

[0058] S1: Based on the rated flow rate of the high-pressure pump of 82L / min and the rated pressure of 50MPa, the working flow rate of the high-pressure water jet nozzle 2 is 8L / min, the working pressure of the high-pressure water jet nozzle 2 cleaning the medicament 9 is 15MPa, and the working pressure of the high-pressure water jet nozzle 2 cleaning the insulation layer 8 is 35MPa, it is determined that the system can maintain operation with 8 high-pressure water jet nozzles 2, that is, 4 pairs. The nozzle mounting bracket 1 has 4 pairs of nozzle transition rods 3 with mounting ports.

[0059] S2: When cleaning the propellant column 9, determine the length L1 of the nozzle transition rod 3 of the first group of nozzles based on the inner diameter of the propellant column 9: the inner radius R1 of the propellant column 9 is 170mm, the outer radius of the propellant column 9 is 215mm, the length D1 of the high-pressure water jet nozzle 2 is 22mm, the high-pressure water jet pressure is 15MPa when cleaning the propellant column 9, and the optimal target distance D of the high-pressure water jet nozzle 2 is 10mm. Then the length of the first group of nozzle transition rod 3 is: L1=170-22-5=143mm; the length of the second group of nozzle transition rod 3 is: L2=143+10=153mm; the length of the third group of nozzle transition rod 3 is: L3=153+10=163mm; the length of the fourth group of nozzle transition rod 3 is: L4=163+10=173mm.

[0060] S3: After determining the number of high-pressure water jet nozzles 2 and the length of the nozzle transition rods 3 during operation, begin the installation of the nozzle transition rods 3 and the high-pressure water jet nozzles 2. The first group of nozzle transition rods 3 and high-pressure water jet nozzles 2 are installed horizontally, with the high-pressure water jet nozzles 2 installed at the end of the nozzle transition rods 3. The axis of the second group of nozzle transition rods 3 forms a 30° angle with the axis of the first group of nozzle transition rods 3, with the high-pressure water jet nozzles 2 installed at the end of the nozzle transition rods 3. The axis of the third group of nozzle transition rods 3 forms a -30° angle with the axis of the first group of nozzle transition rods 3, with the high-pressure water jet nozzles 2 installed at the end of the nozzle transition rods 3. The axis of the fourth group of nozzle transition rods 3 forms a 60° angle with the axis of the first group of nozzle transition rods 3, with the high-pressure water jet nozzles 2 installed at the end of the nozzle transition rods 3.

[0061] S4: As Figure 2 As shown, after completing the installation of the combined cleaning nozzle, connect the combined cleaning nozzle to the high-pressure pipe, start the high-pressure pump, nozzle feeding mechanism and rocket engine rotation mechanism. The nozzle feeding mechanism speed is 10-100 mm / min, and the rocket engine rotation mechanism spindle speed is 10-60 r / min to complete the cleaning of the propellant 9.

[0062] S5: As Figure 3 As shown, when cleaning the insulation layer 8, for a cylindrical section with no diameter change, the nozzle transition rods 3 of multiple sets of high-pressure water jet nozzles 2 can be set to the same length. The inner radius R2 of the insulation layer 8 is 215mm, the outer radius of the insulation layer 8 is 225mm, the length D1 of the high-pressure water jet nozzle 2 is 22mm, the high-pressure water jet pressure when cleaning the insulation layer 8 is 35MPa, and the optimal target distance D of the high-pressure water jet nozzle 2 is 10mm. Therefore, the length L of the nozzle transition rod 3 is... J For: L J =215-22-5=188mm. The combined cleaning nozzle can slowly reciprocate inside the rocket engine to clean the insulation layer 8.

[0063] S6: When cleaning the thermal insulation layer 8, for the head section with varying diameter, the minimum radius R3 of the inner hole of the head section is 160 mm, the length D1 of the high-pressure water jet nozzle 2 is 22 mm, the pressure of the high-pressure water jet when cleaning the thermal insulation layer 8 is 35 MPa, the optimal target distance D of the high-pressure water jet nozzle 2 is 10 mm, then the length K1 of the first group of nozzle transition rods 3 is: K1 = 160-22-5 = 133 mm, the length K2 of the second group of nozzle transition rods 3 is: K2 = 133+10 = 143 mm. Since the length of the head section is short, only two groups of high-pressure water jet nozzles 2 are arranged here. The combined cleaning nozzle can slowly reciprocate in the interior of the rocket engine to complete the cleaning of the thermal insulation layer 8.

Claims

1. A solid rocket engine grain and insulation layer combined cleaning nozzle comprising a nozzle mounting frame (1) and a plurality of high-pressure water jet nozzles (2) provided on the nozzle mounting frame (1), characterized in that, The high-pressure water jet nozzles (2) are arranged at intervals, and part or all of the high-pressure water jet nozzles (2) are installed on the nozzle mounting frame (1) through nozzle transition rods (3), so that the distance between all the high-pressure water jet nozzles (2) and the propellant grain (9) and the distance between all the high-pressure water jet nozzles (2) and the heat-insulating layer (8) are 0.5-1.5 times the optimal target distance of the high-pressure water jet nozzles (2). Along the traveling direction of the nozzle mounting frame (1), the length L1 of the nozzle transition rod (3) equipped for the first group of high-pressure water jet nozzles (2) at the front end of the traveling direction meets the following requirement: L1=R1-D1-(D / 2), wherein the inner hole radius of the propellant grain (9) is R1, the length of the high-pressure water jet nozzle (2) is D1, and the optimal target distance of the high-pressure water jet nozzle (2) is D; the length L2 of the nozzle transition rod (3) equipped for the second group of high-pressure water jet nozzles (2) at the front end of the traveling direction meets the following requirement: L2=L1+D; and so on, the length L N of the nozzle transition rod (3) equipped for the Nth group of high-pressure water jet nozzles (2) at the last end of the traveling direction meets the following requirement: L N = L N-1 +D.

2. The combination cleaning jet of claim 1, wherein, The number N of groups of the high-pressure water jet nozzles (2) needs to meet the following requirements: Wherein, Q1 is the working flow of single high-pressure water jet nozzle (2), Q is the rated flow of high-pressure pump, and one pair of high-pressure water jet nozzles (2) is arranged in each group. D / 2≤the distance between the Nth group of high-pressure water jet nozzles (2) located at the last end in the direction of travel and the propellant grain (9)≤D.

3. The combination cleaning jet of claim 1, wherein, When cleaning the thermal insulation layer (8), for a cylindrical tube section without diameter change, the lengths of the nozzle transition rods (3) of all the high-pressure water jet nozzles (2) are equal, and the length L of the nozzle transition rod (3) J satisfies the following requirement: L J =R2-D1-(D / 2), wherein R2 is the inner hole radius of the thermal insulation layer (8), D1 is the length of the high-pressure water jet nozzle (2), and D is the optimal target distance of the high-pressure water jet nozzle (2).

4. The combination cleaning jet of claim 1, wherein, The solid rocket engine end comprises a diameter-changing head section, for the cleaning of the heat insulation layer (8) at the diameter-changing head section, along the traveling direction of the nozzle mounting frame (1), the length K1 of the nozzle transition rod (3) equipped with the first group of high-pressure water jet nozzles (2) at the front end of the traveling direction meets the following requirements: K1=R3-D1-(D / 2), wherein the minimum radius of the inner hole of the head section is R3, the length of the high-pressure water jet nozzle (2) is D1, and the optimal target distance of the high-pressure water jet nozzle (2) is D; the length K2 of the nozzle transition rod (3) equipped with the second group of high-pressure water jet nozzles (2) at the front end of the traveling direction meets the following requirements: K2=K1+D; and so on, the length K N of the nozzle transition rod (3) equipped with the Nth group of high-pressure water jet nozzles (2) at the last end of the traveling direction meets the following requirements: K N =K N-1 +D.

5. The combination cleaning jet of claim 1, wherein, The high-pressure water jet nozzles (2) are arranged at intervals on the nozzle mounting frame (1), the distance between adjacent high-pressure water jet nozzles (2) arranged at intervals is 50-100 mm, and a pair of high-pressure water jet nozzles (2) are arranged symmetrically along the axial direction of the nozzle mounting frame (1).

6. The combination cleaning jet of claim 5, wherein, A plurality of pairs of high-pressure water jet nozzles (2) are arranged at different positions, and the included angle between adjacent high-pressure water jet nozzles (2) arranged at different positions is 30°-60°.

7. A method for cleaning a solid rocket engine grain and insulation layer using a combination cleaning head of a solid rocket engine grain and insulation layer according to any one of claims 1 to 6, characterized in that, The method comprises the following steps: S1: Part or all of the high-pressure water jet nozzles (2) are installed on the nozzle mounting frame (1) through the nozzle transition rods (3), so that the distance between all the high-pressure water jet nozzles (2) and the propellant grain (9) is near the optimal target distance of the high-pressure water jet nozzles (2); S2: The solid rocket engine is slowly rotated along the center line, the combined cleaning nozzle is inserted from the end with a larger opening of the solid rocket engine, and moves forward along the center line of the solid rocket engine, the forward speed is matched with the cleaning effect, and the cleaning of the propellant grain (9) is completed; S3: The combined cleaning nozzle is removed from the solid rocket engine, and the nozzle transition rod (3) is replaced, so that the distance between all the high-pressure water jet nozzles (2) and the heat-insulating layer (8) is near the optimal target distance of the high-pressure water jet nozzles (2); S4: The solid rocket engine is slowly rotated along the center line, the combined cleaning nozzle is inserted from the end with a larger opening of the solid rocket engine, and moves forward along the center line of the solid rocket engine, the forward speed is matched with the cleaning effect, and the cleaning of the heat-insulating layer (8) is completed.

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