Diaphragm horizontal mounting and fixing device suitable for rocket engine high modulus test

Abstract

The invention discloses a diaphragm horizontal mounting and fixing device suitable for a rocket engine high modulus test. The diaphragm horizontal mounting and fixing device comprises a diffuser inlet, a sealing ring, a diaphragm, an upper flange ring, a lead screw bolt, a flange bolt and a flange nut. The diffuser inlet comprises a diffuser flange ring, a lead screw bearing platform and a sealing ring groove. The upper flange ring comprises a flange hole and a lead screw supporting platform. The requirement for replacing the diaphragm under the condition that the engine is not affected when the engine is vertically arranged is met, the test preparation period is greatly shortened, and convenient conditions are provided for continuous 76-kilometer high-altitude simulation test run.

Description

Technical Field

[0001] This invention relates to the field of rocket engine testing technology, specifically to a diaphragm horizontal mounting and fixing device suitable for high-mode rocket engine testing. Background Technology

[0002] In high-altitude simulation tests of rocket engines, before the initial start-up, it is generally necessary to test the engine's operation under ignition conditions in a thin atmosphere. The required ambient pressure at this time needs to simulate the pressure of the high-altitude environment. During ignition, the engine ejects a large amount of combustion gases, which are typically expelled by an ejector pump to maintain a vacuum environment. Because it is difficult to maintain a vacuum level of Pascals in the ejector pump environment, a diaphragm is usually placed at the engine nozzle before ignition to isolate the test environment of the engine from that of the ejector pump. The test environment of the engine is maintained at a vacuum level by a mechanical pump. When the engine ignites, the diaphragm is burned through, connecting the environment of the ejector pump behind the diaphragm to the test environment. The ejector pump carries away the combustion products of the engine, maintaining the vacuum level of the test environment. Before ignition, a mechanical pump is used on the engine side of the diaphragm to draw a higher vacuum to Pascals to ensure the test requirements for the initial engine start-up, as described in invention patent CN114018584B, "A 76km High-Altitude Environment Simulation System and Method for Rocket Engine Testing." The thin film fixing method described in this invention is a vertical arrangement, with the diaphragm normal perpendicular to the direction of gravity. The engine nozzle faces the diaphragm directly, so a vertical arrangement makes the engine axis perpendicular to the direction of gravity. During engine testing, gravity can easily cause uneven stress on both sides of the engine. Therefore, a horizontal arrangement of the diaphragm has gradually become the development direction for testing environments.

[0003] In existing horizontal diaphragm installation methods, replacing the engine diaphragm is difficult and not conducive to diaphragm disassembly and installation. This is because in this arrangement, the engine is placed on top of the diaphragm. When replacing the diaphragm, the flange ring that fixes the diaphragm needs to be moved upwards. However, the engine is located above the diaphragm flange ring, making it difficult to place a lifting point above it. When replacing the diaphragm, the engine must be removed first. When facing the requirement of multiple 76 km vacuum simulation tests for the same engine, frequent diaphragm replacements require a longer test preparation cycle. Therefore, it is necessary to design a fixing device suitable for horizontal diaphragm arrangement that is easy to install and replace the diaphragm to meet the usage requirements. Summary of the Invention

[0004] The purpose of this invention is to provide a diaphragm horizontal mounting and fixing device suitable for high-mode testing of rocket engines, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a diaphragm horizontal mounting and fixing device suitable for high-mode rocket engine testing, comprising a diffuser inlet, a sealing ring, a diaphragm, an upper flange ring, a lead screw bolt, a flange bolt, and a flange nut; the diffuser inlet includes a diffuser flange ring, a lead screw bearing platform, and a sealing ring groove, and the upper flange ring includes a flange hole and a lead screw support platform.

[0006] Preferably, the diffuser inlet has a cylindrical structure, and the diffuser flange is installed on the outer side of the upper edge of the diffuser inlet.

[0007] Preferably, the diffuser inlet flange ring has multiple flange holes arranged in a circular pattern, and the central axis of the flange hole pitch circle coincides with the central axis of the diffuser channel.

[0008] Preferably, the outer diameter of the diaphragm is at least 5 cm larger than the pitch circle diameter of the diffuser flange hole, and the pitch circle diameter of the diffuser flange hole is at least 1 cm larger than the outer diameter of the sealing ring groove.

[0009] Preferably, the parts are arranged from top to bottom during installation as follows: upper flange ring, diaphragm, sealing ring and diffuser inlet, wherein the rocket engine nozzle is located about 5cm above the diaphragm, and the direction of the rocket engine nozzle is directly opposite the direction of the diaphragm, so as to ensure that the diaphragm can be burned through during the first ignition of the engine.

[0010] Preferably, the diffuser inlet is provided with screw bearing platforms on both sides, and the upper flange is provided with screw support platforms on both sides. The screw bearing platforms are provided with screw holes with internal threads. The internal thread specification of the holes is a standard thread or a fine thread, which matches the external thread specification of the screw bolt. There is a screw positioning ring below the screw support platform. The position of the screw positioning ring is consistent with the screw hole on the screw bearing platform and corresponds one-to-one.

[0011] Preferably, the method for replacing the diaphragm without disassembling the engine includes the following steps: S1: Remove all flange bolts on the upper flange ring except those corresponding to the screw bearing platform; S2: Tighten the screw bolts under the screw bearing platform to lift the upper flange ring by 5cm with the support of the screw bolts; S3: Slowly remove the used residual membrane from the side of the device; S4: Cut a new diaphragm to match the required diaphragm size; S5: Apply sealing grease to the surface of the sealing ring and place the sealing ring in the sealing ring groove at the diffuser inlet; S6: Slowly move the new diaphragm into the device from the side, ensuring that the diffuser inlet and the through hole of the upper flange are covered by the diaphragm; S7: Tighten the screw bolts under the screw bearing platform to reset the upper flange ring to fit the diaphragm; S8: Use a hot melt gun to heat the diaphragm flange hole at the flange hole position of the upper flange ring to make the diaphragm flange hole with the same specification as the flange hole. S9: Install and tighten all flange bolts on the upper flange ring; S10: After the engine ignites and burns through the diaphragm, open the vacuum chamber vent valve to restore atmospheric pressure inside the vacuum chamber, open the vacuum chamber door, and repeat steps S1-S9 to prepare for the next test run.

[0012] Preferably, in step S2, the lifting height of the upper flange ring is precisely controlled by the number of turns of the screw bolt to ensure that the lifting height is stably maintained at 5cm, and the relative position of the upper flange ring with the diffuser inlet moves only along the diffuser channel axis during the lifting process.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention meets the requirement of diaphragm replacement without affecting the engine when the engine is vertically arranged, greatly shortens the test preparation cycle, and provides convenient conditions for continuous 76km high-altitude simulated test.

[0014] 2. The present invention uses a hot melt gun to heat out the diaphragm flange hole on the shoulder ring, which allows the diaphragm manufacturing cycle and the bolt replacement cycle to run in parallel, thus shortening the installation time.

[0015] 3. The method of creating flange holes after installing the diaphragm allows the diaphragm to be assembled only once during manufacturing and installation, improving the system's adaptability and thus enhancing the overall sealing performance. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of a diaphragm horizontal mounting and fixing device suitable for high-mode testing of rocket engines proposed in this invention; Figure 2 This is a three-dimensional structural diagram of a diaphragm horizontal mounting and fixing device suitable for high-mode testing of rocket engines proposed in this invention; Figure 3 This is a schematic diagram of the structure of the lead screw and lead screw support platform of the diaphragm horizontal mounting and fixing device for rocket engine high-mode testing proposed in this invention.

[0017] In the diagram: 1. Upper flange inter-ring bolt hole; 2. Screw support platform; 3. Diaphragm bolt hole; 4. Sealing ring groove; 5. Screw load-bearing platform; 6. Screw hole position; 7. Diffuser inlet flange; 8. Diffuser flange bolt hole; 9. Diffuser channel; 10. Screw positioning ring; 11. Flange bolt; 12. Upper flange inter-ring; 13. Diaphragm; 14. Sealing ring; 15. Diffuser inlet; 16. Flange nut; 17. Screw bolt. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1: Please refer to Figure 1-3 The present invention provides a technical solution: a diaphragm horizontal mounting and fixing device suitable for high-mode testing of rocket engines, including a diffuser inlet 15, a sealing ring 14, a diaphragm 13, an upper flange ring 12, a lead screw bolt 17, a flange bolt 11, and a flange nut 16; the diffuser inlet 15 includes a diffuser flange ring 7, a lead screw bearing platform 5, and a sealing ring groove 4, and the upper flange ring 12 includes a flange hole 1 and a lead screw support platform 2.

[0020] The diffuser inlet 15 is a cylindrical structure. The diffuser flange 7 is installed on the outer side of the upper edge of the diffuser inlet 15. The diffuser inlet flange 7 has multiple flange holes 8, which are arranged in a circular pattern. The central axis of the pitch circle of the flange holes 8 coincides with the central axis of the diffuser channel 9. The outer diameter of the diaphragm 13 is at least 5 cm larger than the pitch circle diameter of the diffuser flange holes 8, and the pitch circle diameter of the diffuser flange holes 8 is at least 1 cm larger than the outer diameter of the sealing ring groove 4. During installation, the parts are arranged from top to bottom as follows: upper flange 12, diaphragm 13, sealing ring 14, and diffuser inlet 15. The rocket engine nozzle is located on the diaphragm 13. At a position approximately 5cm above the diaphragm 13, the rocket engine nozzle is aligned with the diaphragm 13 to ensure that the diaphragm 13 is burned through during the first ignition of the engine. Screw support platforms 5 are located on both sides of the diffuser inlet 15, and screw support platforms 2 are located on both sides of the upper flange ring 12. Screw support platforms 5 have screw holes 6 with internal threads. The internal threads are either standard or fine-pitch threads, matching the external thread specifications on the screw bolt 17. Below the screw support platform 2 is a screw positioning ring 10, whose position corresponds one-to-one with the screw hole 6 on the screw support platform 5.

[0021] The method for replacing diaphragm 13 without disassembling the engine includes the following steps: S1: Remove all flange bolts 11 on the upper flange ring 12 except for those at the corresponding positions of the screw bearing platform 5; S2: Tighten the screw bolt 17 under the screw bearing platform 5 to lift the upper flange ring 12 by 5cm under the support of the screw bolt 17; S3: Slowly remove the used residual membrane 13 from the side of the device; S4: Cut a new diaphragm 13 to match the size requirements of diaphragm 13; S5: Apply sealing grease to the surface of the sealing ring 14 and place the sealing ring 14 into the sealing ring groove 4 of the diffuser inlet 15; S6: Slowly move the new diaphragm 13 into the device from the side, ensuring that the diffuser inlet 15 and the through hole of the upper flange ring 12 are covered by the diaphragm 13. S7: Tighten the screw bolt 17 under the screw bearing platform 5 to reset the upper flange ring 12 to fit with the diaphragm 13; S8: Use a hot melt gun to heat the diaphragm 13 at the flange hole 1 position of the upper flange ring 12 to create a diaphragm flange hole 3 with the same specifications as the flange hole 1. S9: Install and tighten all flange bolts 11 on the upper flange ring 12; S10: After the engine ignites and burns through diaphragm 13, open the vacuum chamber vent valve to restore atmospheric pressure in the vacuum chamber, open the vacuum chamber door, and repeat steps S1-S9 to prepare for the next test run.

[0022] In step S2, the lifting height of the upper flange ring 12 is precisely controlled by the number of turns of the screw bolt 17 to ensure that the lifting height is stably maintained at 5cm, and the upper flange ring 12 moves only along the axis of the diffuser inlet 15 during the lifting process.

[0023] Exploded view of the parts of this invention is as follows Figure 2 As shown, the positions and quantities of flange bolts (11), upper flange inter-ring bolt holes (1), diaphragm bolt holes (3), diffuser flange bolt holes (8), and flange nuts (16) correspond one-to-one. The flange bolts pass through the bolt holes of the upper flange inter-ring (1), diaphragm (3), and diffuser flange (8) sequentially from top to bottom, and are finally tightened with flange nuts (16) to secure the upper flange inter-ring (12), diaphragm (13), sealing ring (14), and diffuser inlet (15). Before tightening flange bolts (11), screw rod (17) must be unscrewed from screw rod hole (6). Screw rod (17) passes through screw rod hole (6) and is inserted into screw rod positioning ring (10). Screw rod positioning ring maintains the relative positions of upper flange inter-ring (12) and diffuser inlet (15). Sealing ring (14) mates with sealing ring groove (4). During installation, sealing ring (14) must be placed under diaphragm (13) to ensure vertical isolation of the diaphragm. Except for diaphragm (13) and sealing ring (14), all other components are made of metal.

[0024] During the high-altitude simulation test of the engine, all equipment is located inside a vacuum chamber. The specific steps in the preparation process before the test are as follows: 1. First, remove the 11 flange bolts, then turn the lead screw 17 to lift the 12 upper flange ring to a distance of 5cm from the diffuser inlet flange face 7; 2. Place the 14 sealing ring into the 4 sealing ring groove and apply vacuum grease; 3. Insert the unperforated diaphragm into the gap between the 12 upper flange ring and the 7 diffuser inlet flange, ensuring it is completely flat and covers the 14 sealing ring, and press the diaphragm and sealing ring tightly together; 4. Tighten the lead screw 17 in the reverse direction to reset the flange ring on 12; 5. Use a hot melt gun to punch holes in the diaphragm at the designated positions; 6. Install the 11 flange bolts, thread them through, and tighten the nuts; 7. After personnel leave the vacuum chamber, close the vacuum chamber and begin vacuuming. Once the vacuum level is satisfactory, ignite the engine.

[0025] Example 2: During multiple 76km tests without changing the engine, the specific steps in the preparation process during the test intervals are as follows: 1. Open the air valve of the vacuum chamber to allow the environment inside the vacuum chamber to change. 2. After atmospheric pressure is restored inside the vacuum chamber, open the vacuum chamber door; 3. Enter the vacuum chamber, remove the 11 flange bolts, and then turn the lead screw 17 to lift the 12 upper flange ring to a distance of 5cm from the diffuser inlet flange face 7; 4. Slowly remove the used residual membrane from the side of the device; 5. Cut the new membrane sheet; 6. Apply sealant to the sealing ring and place the sealing ring in the sealing ring groove; 7. Slowly move the diaphragm into the device from the side, ensuring that the diaphragm is in place at each bolt hole; 8. Tighten the screw bolts under the screw bearing platform to reset the upper flange ring; 9. Use a hot melt gun to heat out the flange holes for the diaphragm on the shoulder ring; 10. Simultaneously install and tighten all bolts on the flange shoulder ring; 11. After personnel leave the vacuum chamber, close the vacuum chamber and begin vacuuming. Once the vacuum level is satisfactory, ignite the engine. 12. After the engine ignites and burns through the diaphragm, repeat steps 1 to 11, and then conduct another test run. The remaining features are the same as in Example 1.

[0026] The working principle is as follows: The device uses flange bolts 11 and flange nuts 16 to sequentially press and fix the upper flange interlocking ring 12, diaphragm 13, sealing ring 14, and diffuser inlet 15 from top to bottom. The sealing ring 14 is embedded in the sealing ring groove 4 of the diffuser inlet 15, effectively isolating the upper and lower spaces of the diaphragm 13 and meeting the high vacuum environment requirements of the engine side before the test. During the test, the high-temperature combustion gases generated by engine ignition burn through the diaphragm 13, connecting the engine-side test environment with the ejector pump environment. The ejector pump can then promptly discharge combustion products, maintaining the vacuum level of the test environment.

[0027] When the diaphragm 13 needs to be replaced, there is no need to disassemble the engine. Simply remove the flange bolts 11 on the upper flange ring 12 except for the position corresponding to the screw bearing platform 5. By turning the screw bolt 17, the upper flange ring 12 can be precisely lifted and fixed at a height of 5cm or 10cm. The old diaphragm 13 can be taken out and the new diaphragm 13 can be inserted from the side. After the new diaphragm 13 is installed, use a hot melt gun to heat out the diaphragm bolt holes 3 at the corresponding positions of the upper flange ring bolt hole 1 and the diffuser flange bolt hole 8. Then reinstall and tighten the flange bolts 11 to complete the replacement of the diaphragm 13. This greatly shortens the test preparation cycle and is suitable for the needs of multiple continuous high-altitude simulated test runs.

[0028] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A diaphragm horizontal mounting and fixing device suitable for high-mode testing of rocket engines, comprising a diffuser inlet (15), a sealing ring (14), a diaphragm (13), an upper flange ring (12), a lead screw bolt (17), a flange bolt (11), and a flange nut (16); characterized in that: The diffuser inlet (15) includes a diffuser flange (7), a screw bearing platform (5) and a sealing ring groove (4), and the upper flange (12) includes a flange hole (1) and a screw support platform (2).

2. The diaphragm horizontal mounting and fixing device for high-mode testing of rocket engines as described in claim 1, characterized in that, The diffuser inlet (15) is a cylindrical structure, and the diffuser flange (7) is installed on the outer side of the upper edge of the diffuser inlet (15).

3. The diaphragm horizontal mounting and fixing device for high-mode testing of rocket engines as described in claim 1, characterized in that, The diffuser inlet flange ring (7) has multiple flange holes (8), which are arranged in a circle. The central axis of the pitch circle of the flange hole (8) coincides with the central axis of the diffuser channel (9).

4. The diaphragm horizontal mounting and fixing device for high-mode testing of rocket engines as described in claim 1, characterized in that: The outer diameter of the diaphragm (13) is at least 5 cm larger than the pitch circle diameter of the diffuser flange hole (8), and the pitch circle diameter of the diffuser flange hole (8) is at least 1 cm larger than the outer diameter of the sealing ring groove (4).

5. The diaphragm horizontal mounting and fixing device for high-mode testing of rocket engines as described in claim 1, characterized in that, During installation, the parts are arranged from top to bottom as follows: upper flange ring (12), diaphragm (13), sealing ring (14) and diffuser inlet (15). The rocket engine nozzle is located about 5cm above the diaphragm (13), and the direction of the rocket engine nozzle is directly opposite the direction of the diaphragm (13) to ensure that the diaphragm (13) can be burned through during the first ignition of the engine.

6. The diaphragm horizontal mounting and fixing device for high-mode testing of rocket engines as described in claim 1, characterized in that, The diffuser inlet (15) is provided with screw bearing platforms (5) on both sides, and screw support platforms (2) are provided on both sides of the upper flange ring (12). Screw bearing platforms (5) are provided with screw holes (6). The holes are threaded internally. The internal thread specification is a standard thread or a fine thread. The thread specification matches the external thread specification on the screw bolt (17). There is a screw positioning ring (10) below the screw support platform (2). The position of the screw positioning ring (10) is consistent with and corresponds one-to-one with the screw hole (6) on the screw bearing platform (5).

7. A diaphragm horizontal mounting and fixing device suitable for high-mode testing of rocket engines, characterized in that: The method for replacing the diaphragm (13) without disassembling the engine includes the following steps: S1: Remove all flange bolts (11) on the upper flange ring (12) except for the corresponding position of the screw bearing platform (5); S2: Tighten the screw bolt (17) under the screw bearing platform (5) to lift the upper flange ring (12) by 5cm under the support of the screw bolt (17); S3: Slowly remove the used residual membrane (13) from the side of the device; S4: Cut a new diaphragm (13) to match the size requirements of the diaphragm (13); S5: Apply sealing grease to the surface of the sealing ring (14) and place the sealing ring (14) in the sealing ring groove (4) of the diffuser inlet (15); S6: Slowly move the new diaphragm (13) into the device from the side, ensuring that the diffuser inlet (15) and the through hole of the upper flange (12) are covered by the diaphragm (13); S7: Tighten the screw bolt (17) under the screw bearing platform (5) to reset the upper flange ring (12) to fit with the diaphragm (13); S8: Use a hot melt gun to heat the diaphragm (13) at the flange hole (1) position of the upper flange ring (12) to create a diaphragm flange hole (3) with the same specifications as the flange hole (1). S9: Install and tighten all flange bolts (11) on the upper flange ring (12); S10: After the engine ignites and burns through the diaphragm (13), open the vacuum chamber vent valve to restore atmospheric pressure in the vacuum chamber, open the vacuum chamber door, and repeat steps S1-S9 to prepare for the next test run.

8. A diaphragm horizontal mounting and fixing device suitable for high-mode testing of rocket engines according to claim 7, characterized in that: In step S2, the lifting height of the upper flange ring (12) is precisely controlled by the number of turns of the screw bolt (17) to ensure that the lifting height is stably maintained at 5cm, and the relative position of the upper flange ring (12) and the diffuser inlet (15) moves only along the axis of the diffuser channel (9) during the lifting process.

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