Test tool for testing flow resistance characteristic of contraction and expansion section of spray pipe

Abstract

The invention relates to a liquid rocket engine, and provides a test tool for testing the flow resistance characteristic of a contraction and expansion section of a spray pipe in order to solve the technical problems that an existing spray pipe test tool is small in application range, low in data accuracy and the like, and the test tool comprises a fixed tray, a supporting assembly, a liquid collecting assembly and a clamping assembly. A tray through hole is formed in the middle of the fixed tray; the supporting assembly comprises a first supporting support and a second supporting support which are symmetrically arranged on the two sides of the tray through hole respectively. The liquid collecting assembly comprises a liquid collecting cylinder and connecting supports symmetrically arranged on the two sides of the inlet end of the liquid collecting cylinder, the fixed ends of the two connecting supports are fixed to the top of the first supporting support and the top of the second supporting support respectively, and the clamping assembly comprises a cross-shaped clamping support, two lifting lug studs, a set of half-moon-shaped clamps and a limiting disc. The two lifting lug studs are installed in the lifting lug installation holes in the connecting support respectively, and the other ends of the lifting lug studs are matched with the half-moon-shaped clamps to be used for clamping and locking the spraying pipe contracting and expanding section to the lower surface of the limiting disc.

Description

Technical Field

[0001] The invention relates to a test fixture for a liquid rocket engine nozzle structure, in particular to a test fixture for testing the flow resistance characteristics of a nozzle divergence section. Background Art

[0002] The nozzle is a component in a liquid rocket engine that is responsible for accelerating the expansion of the fuel gas and obtaining reverse thrust. In order for the nozzle to withstand high-temperature fuel gas, a cooling jacket is generally provided inside the nozzle to cool the nozzle, thereby preventing it from being burned by the high-temperature fuel gas and affecting the normal operation of the liquid rocket engine.

[0003] During the development of the nozzle, it is necessary to conduct flow resistance characteristic tests on each section. Among them, the nozzle expansion section is an important component, and it is extremely important to obtain accurate data on its flow resistance characteristic test. However, the existing test tooling has a complex structure, cumbersome assembly process, and a relatively limited scope of application, which cannot meet modern, high-precision testing needs.

[0004] In order to adapt to the needs of automated testing and improve product testing efficiency, it is necessary to design a structurally stable and reliable test fixture so that the nozzle expansion section can obtain more accurate and reliable test data during the flow resistance characteristic test, so that it can be combined with external devices to meet the test needs of automated product transportation. Summary of the invention

[0005] The purpose of the present invention is to solve the technical problems that the test fixture of the existing nozzle divergence section in the flow resistance characteristics test is simple in structure, has a limited scope of application, low test efficiency, low data accuracy, and cannot meet the test requirements of automated product transportation. A test fixture for testing the flow resistance characteristics of the nozzle divergence section is proposed.

[0006] To achieve the above objectives, the technical solution proposed by the present invention is:

[0007] A test fixture for testing the flow resistance characteristics of a nozzle convergence and expansion section, which is special in that it includes: a fixed tray, a support assembly arranged on the fixed tray, a liquid collecting assembly and a clamping assembly arranged on the support assembly;

[0008] A tray through hole is provided in the middle of the fixed tray for the flow of the test medium;

[0009] The support assembly comprises a first support bracket and a second support bracket symmetrically arranged on both sides of the through hole of the tray;

[0010] The liquid collecting assembly comprises a liquid collecting cylinder and connecting brackets symmetrically arranged on both sides of the inlet end of the liquid collecting cylinder, the fixed ends of the two connecting brackets are respectively fixed to the top of the first supporting bracket and the second supporting bracket, the outlet end of the liquid collecting cylinder is located near the through hole of the tray, and the liquid collecting cylinder is used for collecting and diverting the test medium;

[0011] The clamping assembly comprises a cross clamping bracket, two lifting ear studs, a group of half-moon clamps, and a limit plate fixed to the lower surface of the cross clamping bracket, the cross clamping bracket comprises a first transverse support rod and a second transverse support rod connected in a cross manner, the two ends of the first transverse support rod are respectively connected to the two connecting brackets, two lifting ear mounting holes are symmetrically provided on the first transverse support rod at positions corresponding to the two sides of the limit plate, one end of the two lifting ear studs are respectively installed in the lifting ear mounting holes, and the other ends are respectively cooperated with a group of half-moon clamps to clamp and lock the large end of the nozzle expansion section on the lower surface of the limit plate;

[0012] The central axes of the tray through hole, the liquid collecting cylinder and the limiting plate coincide with each other.

[0013] Furthermore, a protective gasket is provided on the lower surface of the limiting plate to protect the connecting end of the nozzle expansion section to prevent it from being bumped and deformed.

[0014] Furthermore, the tops of the first supporting bracket and the second supporting bracket are both provided with grooves, and the fixed ends of the two connecting brackets are respectively embedded in the corresponding grooves and fixedly connected to the tops of the first supporting bracket and the second supporting bracket by screws.

[0015] Furthermore, a positioning column is provided in the groove, and a positioning hole adapted to the positioning column is provided on each of the connecting brackets, so as to quickly position and install the liquid collecting assembly on the supporting assembly;

[0016] A clamping device is provided on either side of the groove for fixing and clamping the connecting bracket.

[0017] Furthermore, a liquid collecting cylinder bracket is provided between the bottoms of the first supporting bracket and the second supporting bracket, and the outlet end of the liquid collecting cylinder is connected to the liquid collecting cylinder bracket to maintain the stability of the liquid collecting assembly.

[0018] Furthermore, a protective gasket is provided on the fixed end of each connecting bracket at a position close to the liquid collecting cylinder.

[0019] Furthermore, a triangular plate reinforcement rib is provided at the connection position between the first transverse support rod and the second transverse support rod of the cross clamping bracket to ensure the stability of the cross clamping bracket.

[0020] Furthermore, the fixed pallet includes a pallet bracket and a pallet fixed on the pallet bracket, and the pallet bracket is a hollow quadrilateral bracket; corner columns are provided on the four corners of the quadrilateral bracket, and support columns are provided in the middle of each side of the quadrilateral bracket, and forks that are compatible with fork rods of external transfer equipment are provided between each support column and the corner columns on its corresponding sides, so as to transfer the test tooling.

[0021] Furthermore, the liquid collecting cylinder is a flared structure, the inlet end of which is a large end of the flared structure, and the outlet end is a small end of the flared structure.

[0022] Furthermore, the limiting plate is made of stainless aluminum;

[0023] The liquid collecting cylinder is made of thin-walled steel plate material.

[0024] Beneficial effects of the present invention:

[0025] [1] The test fixture for testing the flow resistance characteristics of the nozzle expansion section of the present invention has a simple structure, strong stability, and is easy to disassemble and assemble. It has a wide range of applications. The integrated design of the test product fixture, test bench and transfer tray can meet the automatic transfer of the nozzle expansion section. The test product can be firmly clamped and fixed by the clamping component, and then the medium can be collected and diverted during the test through the liquid collecting component, which effectively improves the stability of the test fixture and the validity and reliability of the test data.

[0026] [2] The present invention provides a tray through hole in the middle of the tray, which can ensure the smooth flow of the test medium and avoid water accumulation at the test site.

[0027] [3] The present invention provides a protective gasket on the connecting bracket to effectively avoid bumps during the product installation process.

[0028] [4] The present invention designs the liquid collecting cylinder as a flared structure, wherein the inlet end is the large end of the flared structure and the outlet end is the small end of the flared structure, which can ensure the flow diversion effect of the test medium in the inlet section, improve the application scope of the tooling, and can undertake liquid flow tests of products of the same type and multiple specifications.

[0029] [5] The present invention effectively enhances the stability of the test fixture by arranging a triangular plate reinforcement rib at the middle connection of the cross clamping bracket, thereby avoiding shaking during the test and affecting the test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A three-dimensional structural diagram of an embodiment of a test fixture for testing the flow resistance characteristics of a nozzle diverging section of the present invention;

[0031] Figure 2 This is a schematic diagram of the structure of a fixed tray in an embodiment of the present invention;

[0032] Figure 3 It is a structural schematic diagram of a support assembly in an embodiment of the present invention;

[0033] Figure 4 It is a schematic diagram of the structure of the liquid collecting component in an embodiment of the present invention;

[0034] Figure 5 It is a schematic diagram of the structure of the clamping assembly in an embodiment of the present invention;

[0035] Reference numerals:

[0036] 1-fixed tray, 2-support assembly, 3-liquid collecting assembly, 4-clamping assembly, 5-tray through hole, 6-first supporting bracket, 7-second supporting bracket, 8-liquid collecting cylinder, 9-connecting bracket, 10-cross clamping bracket, 11-lifting ear stud, 12-half-moon clamp, 13-limiting plate, 14-first horizontal support rod, 15-second horizontal support rod, 16-lifting ear mounting hole, 17-protective gasket, 18-groove, 19-positioning column, 20-positioning hole, 21-clamping device, 22-liquid collecting cylinder bracket, 23-protective gasket, 24-triangular plate reinforcement rib, 25-tray bracket, 26-tray, 27-corner column, 28-support column, 29-fork. DETAILED DESCRIPTION

[0037] like Figure 1 As shown, a test fixture for testing the flow resistance characteristics of the nozzle expansion section includes a fixed tray 1, a support assembly 2 coaxially arranged on the fixed tray 1, a liquid collecting assembly 3 and a clamping assembly 4; wherein the nozzle expansion section is connected to at least one inlet flange at the large end, and the nozzle throat is arranged at the small end, one end of the inlet flange is connected to the external medium, and the other end is connected to the large end of the expansion section through a pipeline;

[0038] like Figure 2 As shown, the fixed pallet 1 includes a pallet bracket 25 and a pallet 26 fixed on the pallet bracket 25. The pallet bracket 25 is a hollow quadrilateral bracket. A pallet through hole 5 is opened in the middle of the pallet 26 for the circulation of the test medium. Corner columns 27 are arranged on the four corners of the quadrilateral bracket, and support columns 28 are arranged in the middle of each side of the quadrilateral bracket. A fork 29 matched with an external fork rod is arranged between each support column 28 and the corner column 27 on its corresponding side, which is used to transport the test tooling and realize the docking of the process equipment with the automated transfer forklift. At the same time, it can be used as a test bench in the product test process to realize the rapid placement and withdrawal of the test station.

[0039] The support component 2 is used to effectively support and fix the clamping component 4, the liquid collecting component 3 and the fixed tray 1. Figure 3As shown, the support assembly 2 includes a first support bracket 6 and a second support bracket 7 symmetrically arranged on both sides of the tray through hole 5, and a groove 18 is arranged on the top of the first support bracket 6 and the second support bracket 7, and a positioning column 19 is arranged in the groove 18. A clamping device 21 is arranged on either side of each groove 18, and a liquid collecting cylinder bracket 22 is arranged between the bottoms of the first support bracket 6 and the second support bracket 7. The outlet end of the liquid collecting cylinder 8 is connected to the liquid collecting cylinder bracket 22 to maintain the stability of the liquid collecting assembly 3; the liquid collecting assembly 3 is used to realize the medium collection and diversion during the product test process, such as Figure 4 As shown, the liquid collecting component 3 includes a liquid collecting cylinder 8 and connecting brackets 9 symmetrically arranged on both sides of the inlet end of the liquid collecting cylinder 8, the fixed ends of the two connecting brackets 9 are respectively fixed to the top of the first support bracket 6 and the second support bracket 7, the outlet end of the liquid collecting cylinder 8 is located near the tray through hole 5, and the liquid collecting cylinder 8 is used for collecting and diverting the test medium; the fixed end of each connecting bracket 9 is embedded in the groove 18 and is fixedly connected to the top of the first support bracket 6 and the second support bracket 7 by screws; each connecting bracket 9 is provided with a positioning hole 20 adapted to the positioning column 19, which is used to quickly position and install the liquid collecting component 3 on the support component 2; then the connecting bracket 9 is fixedly clamped on the support component 2 by the clamping device 21, and a protective gasket 23 is provided on the fixed end of each connecting bracket 9 near the inlet end of the liquid collecting cylinder 8. The protective gasket 23 is made of anti-collision materials such as polyurethane to effectively prevent the risk of collision during product assembly. The liquid collecting cylinder 8 is a flared structure, the inlet end of which is a large end of the flared structure, and the outlet end is a small end of the flared structure. The liquid collecting cylinder 8 is made of thin-walled steel plate.

[0040] The clamping assembly 4 is used to achieve safe and reliable fixation of the nozzle expansion section, and to quickly dock and fix with the liquid collecting assembly 3 and the supporting assembly 2; Figure 5 As shown, the clamping assembly 4 includes a cross clamping bracket 10, two lifting ear studs 11, a group of half-moon clamps 12, and a limit plate 13 fixed to the lower surface of the cross clamping bracket 10 by bolts. The limit plate 13 is used to limit the large end of the nozzle expansion section. The large end of the nozzle expansion section is docked and locked on the lower surface of the limit plate 13 by a group of half-moon clamps 12 and two lifting ear studs 11. A protective gasket 17 is also provided on the lower surface of the limit plate 13 to protect the connecting end of the nozzle expansion end to avoid collision and deformation. The limiter and the protective gasket 17 are used to constrain the end face of the nozzle expansion section; the central axes of the tray through hole 5, the liquid collecting cylinder 8 and the limit plate 13 coincide; the nozzle throat is arranged above the flared large end of the liquid collecting cylinder 8, and the test medium is collected and diverted by the liquid collecting cylinder 8 after being sprayed out through the nozzle throat.

[0041] A triangular plate reinforcing rib 24 is provided on the connecting end of the first transverse support rod 14 and the second transverse support rod 15 of the cross clamping bracket 10, so as to ensure the stability and supporting strength of the cross clamping bracket 10; the two ends of the first transverse support rod 14 of the cross clamping bracket 10 are respectively connected to the two connecting brackets 9, and the first transverse support rod 14 on both sides of the limit plate 13 is symmetrically provided with ear mounting holes 16, one end of the two ear studs 11 is respectively installed in the ear mounting holes 16, and the ear studs 11 symmetrically arranged on both sides can ensure the hoisting balance of the clamping assembly 4, and the other end cooperates with a group of half-moon clamps 12 to clamp and lock the nozzle expansion section on the lower surface of the limit plate 13;

[0042] The lifting eye stud is used to form a fixed connection and locking between the nozzle expansion section and the limit plate 13 under the constraint of a set of half-moon clamps 12. A set of half-moon clamps 12 is used to clamp and constrain the nozzle expansion section. The limit plate 13 is made of stainless aluminum material, and the cross clamping bracket 10 is made of 80x60x5 rectangular steel, which effectively enhances the stability and reliability of the device.

[0043] When the test fixture in this embodiment is used to test the flow resistance characteristics of the nozzle divergence section, the test fixture is placed on a test bench, and a test medium is introduced into the test fixture through the inlet flange. The test medium enters the large end of the nozzle divergence section through the inlet flange on the nozzle divergence section, and then is ejected through the nozzle throat. The test medium ejected from the nozzle throat is collected by the liquid collecting cylinder 8 to avoid leakage of the test medium, thereby realizing the test of the flow resistance characteristics of the nozzle divergence section.

Claims

1. A test fixture for testing the flow resistance characteristics of a nozzle divergence section, characterized in that: It comprises a fixed tray (1), a support assembly (2) arranged on the fixed tray (1), a liquid collecting assembly (3) and a clamping assembly (4) arranged on the support assembly (2); A tray through hole (5) is provided in the middle of the fixed tray (1) for the circulation of the test medium; The support assembly (2) comprises a first support bracket (6) and a second support bracket (7) which are symmetrically arranged on both sides of the tray through hole (5); The liquid collecting assembly (3) comprises a liquid collecting cylinder (8) and connecting brackets (9) symmetrically arranged on both sides of the inlet end of the liquid collecting cylinder (8), the fixed ends of the two connecting brackets (9) are respectively fixed to the top of the first supporting bracket (6) and the second supporting bracket (7), the outlet end of the liquid collecting cylinder (8) is located near the tray through hole (5), and the liquid collecting cylinder (8) is used for collecting and diverting the test medium; The clamping assembly (4) comprises a cross clamping bracket (10), two lifting ear studs (11), a group of half-moon clamps (12), and a limit plate (13) fixed on the lower surface of the cross clamping bracket (10), the cross clamping bracket (10) comprises a first transverse support rod (14) and a second transverse support rod (15) connected in a cross manner, the two ends of the first transverse support rod (14) are respectively connected to the two connecting brackets (9), two lifting ear mounting holes (16) are symmetrically provided on the first transverse support rod (14) at positions corresponding to the two sides of the limit plate (13), one end of the two lifting ear studs (11) are respectively installed in the lifting ear mounting holes (16), and the other ends are respectively cooperated with a group of half-moon clamps (12) to clamp and lock the large end of the nozzle expansion section on the lower surface of the limit plate (13); The central axes of the tray through hole (5), the liquid collecting cylinder (8) and the limiting plate (13) coincide with each other.

2. A test fixture for testing the flow resistance characteristics of the nozzle divergence section according to claim 1, characterized in that: A protective gasket (17) is also provided on the lower surface of the limiting plate (13) to protect the connection end of the nozzle expansion section to prevent it from being bumped and deformed.

3. A test fixture for testing the flow resistance characteristics of the nozzle divergence section according to claim 2, characterized in that: The tops of the first supporting bracket (6) and the second supporting bracket (7) are both provided with grooves (18), and the fixed ends of the two connecting brackets (9) are respectively embedded in the corresponding grooves (18) and fixedly connected to the tops of the first supporting bracket (6) and the second supporting bracket (7) by screws.

4. A test fixture for testing the flow resistance characteristics of the nozzle divergence section according to claim 3, characterized in that: A positioning column (19) is arranged in the groove (18), and each of the connecting brackets (9) is provided with a positioning hole (20) adapted to the positioning column (19) for quickly positioning and installing the liquid collecting assembly (3) on the supporting assembly (2); A clamping device (21) is provided on either side of the groove (18) for fixing and clamping the connecting bracket (9).

5. A test fixture for testing the flow resistance characteristics of the nozzle divergence section according to claim 4, characterized in that: A liquid collecting cylinder bracket (22) is provided between the bottoms of the first supporting bracket (6) and the second supporting bracket (7), and the outlet end of the liquid collecting cylinder (8) is connected to the liquid collecting cylinder bracket (22) to maintain the stability of the liquid collecting assembly (3).

6. A test fixture for testing the flow resistance characteristics of the nozzle divergence section according to any one of claims 1 to 5, characterized in that: A protective gasket (23) is provided on the fixed end of each connecting bracket (9) at a position close to the liquid collecting cylinder (8).

7. A test fixture for testing the flow resistance characteristics of the nozzle divergence section according to claim 6, characterized in that: A triangular plate reinforcing rib (24) is provided at the connection position between the first transverse support rod (14) and the second transverse support rod (15) of the cross clamping bracket (10) to ensure the stability of the cross clamping bracket (10).

8. A test fixture for testing the flow resistance characteristics of the nozzle divergence section according to claim 7, characterized in that: The fixed pallet (1) comprises a pallet support (25) and a pallet (26) fixed on the pallet support (25); the pallet support (25) is a hollow quadrilateral support; corner columns (27) are arranged at the four corners of the quadrilateral support; a support column (28) is arranged in the middle of each side of the quadrilateral support; a fork path (29) adapted to a fork rod of an external transfer device is arranged between each support column (28) and the corner column (27) on its corresponding side, so as to transfer the test tooling.

9. The test fixture for testing the flow resistance characteristics of the nozzle divergence section according to claim 1, characterized in that: The liquid collecting cylinder (8) is a flared structure, the inlet end of which is a large end of the flared structure, and the outlet end of which is a small end of the flared structure.

10. A test fixture for testing the flow resistance characteristics of the nozzle divergence section according to claim 9, characterized in that: The limiting plate (13) is made of stainless aluminum; The liquid collecting cylinder (8) is made of thin-walled steel plate material.

Images