A test fixture for testing the flow resistance characteristics of a nozzle divergent section

Abstract

The present application relates to a liquid rocket engine, to solve the technical problems of small application range and low data accuracy of the existing nozzle test tooling, and proposes a test tooling for testing the flow resistance characteristics of the converging-diverging section of the nozzle, comprising a fixed tray, a support assembly, a liquid collecting assembly and a clamping assembly; a tray through hole is formed in the middle of the fixed tray; the support assembly comprises a first support bracket and a second support bracket symmetrically arranged on both sides of the tray through hole; the liquid collecting assembly comprises a liquid collecting cylinder and two 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 fixed on the top of the first support bracket and the second support bracket respectively, the clamping assembly comprises a cross clamping bracket, two lug studs, a set of half moon clamps and a limiting disc, the two lug studs are respectively installed in the lug mounting holes on the connecting brackets, and the other end is matched with the set of half moon clamps for clamping and locking the converging-diverging section of the nozzle on the lower surface of the limiting disc.

Description

TECHNICAL FIELD

[0001] The present application relates to a test tool for liquid rocket engine nozzle structure, in particular to a test tool for testing the flow resistance characteristics of the nozzle converging-diverging section. BACKGROUND

[0002] The nozzle is used in liquid rocket engine to accelerate the expansion of the gas to be ejected, to obtain the reverse thrust; in order to make the nozzle can withstand high temperature gas, generally set up cooling jacket in the nozzle, cooling the nozzle, and then avoid its ablation by high temperature gas, affect the normal work of liquid rocket engine.

[0003] In the development process of the nozzle, the flow resistance characteristics of each section need to be tested, and the nozzle converging-diverging section is an important part, and it is extremely important to obtain accurate data in the flow resistance characteristics test; and the structure of the existing test tool is complex, the assembly process is tedious, the application range is relatively limited, and it cannot meet the modernization and high-precision test requirements.

[0004] In order to adapt to the automatic test demand and improve the product test efficiency, a test tool with stable and reliable structure is needed, so that the nozzle converging-diverging section can obtain more accurate and reliable test data in the flow resistance characteristics test process, and it can be combined with external devices to realize the test demand of product automatic transfer. SUMMARY

[0005] The purpose of the present application is to solve the technical problems of the existing nozzle converging-diverging section in the flow resistance characteristics test process, such as simple structure, limited application range, low test efficiency, low data accuracy, and unable to meet the test demand of product automatic transfer, and a test tool for testing the flow resistance characteristics of the nozzle converging-diverging section is proposed.

[0006] To achieve the above purpose, the technical solution of the present application is:

[0007] A test tool for testing the flow resistance characteristics of the nozzle converging-diverging section, characterized in that: comprising a fixed tray, a support assembly arranged on the fixed tray, a liquid collecting assembly arranged on the support assembly and a clamping assembly;

[0008] The middle part of the fixed tray is provided with a tray through hole for test medium flow;

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

[0010] The liquid collecting assembly comprises a liquid collecting cylinder and connecting supports symmetrically arranged at both sides of the inlet end of the liquid collecting cylinder, the fixed ends of the two connecting supports are fixed at the top of the first support support and the second support support respectively, and the outlet end of the liquid collecting cylinder is located at a position close to the through hole of the tray.

[0011] The clamping assembly comprises a cross clamping support, two lug studs, a set of half moon clamps, and a limiting disc fixed on the lower surface of the cross clamping support, the cross clamping support comprises a first transverse support rod and a second transverse support rod connected in cross, the two ends of the first transverse support rod are connected with the two connecting supports respectively, two lug mounting holes are symmetrically formed on the first transverse support rod at positions corresponding to the two sides of the limiting disc, one end of the two lug studs is mounted in the lug mounting hole respectively, and the other end is matched with the set of half moon clamps for clamping and locking the large end of the converging-diverging section of the nozzle on the lower surface of the limiting disc.

[0012] The central axes of the through hole of the tray, the liquid collecting cylinder and the limiting disc coincide.

[0013] Further, a protective gasket is arranged on the lower surface of the limiting disc for protecting the connecting end of the converging-diverging section of the nozzle and avoiding bumping and deformation.

[0014] Further, the top of the first support support and the top of the second support support are provided with grooves, and the fixed ends of the two connecting supports are respectively embedded in the corresponding grooves and fixedly connected with the top of the first support support and the top of the second support support through screws.

[0015] Further, a positioning column is arranged in the groove, and a positioning hole matched with the positioning column is formed on each connecting support for quickly positioning and installing the liquid collecting assembly on the support assembly.

[0016] Any side of the groove is provided with a clamping device for fixedly clamping the connecting support.

[0017] Further, a liquid collecting cylinder bracket is arranged between the bottom of the first support support and the bottom of the second support support, and the outlet end of the liquid collecting cylinder is supported on the liquid collecting cylinder bracket for maintaining the stability of the liquid collecting assembly.

[0018] Further, a protective gasket is arranged on each connecting support close to the liquid collecting cylinder.

[0019] Further, a triangular plate reinforcing rib is arranged at the connecting position of the first transverse support rod and the second transverse support rod of the cross clamping support for ensuring the stability of the cross clamping support.

[0020] Further, the fixed tray comprises a tray support and a tray fixed on the tray support, the tray support is a hollow quadrilateral support; an angle column is arranged on each corner of the quadrilateral support, and a supporting column is arranged in the middle of each side of the quadrilateral support; a fork channel matched with a fork rod of an external transfer device is arranged between each supporting column and the angle column on the corresponding side, for transferring the test tooling.

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

[0022] Further, the limiting disc is made of stainless aluminum material.

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

[0024] The beneficial effects of the present application are as follows:

[0025] 【1】The test tooling for testing the flow resistance characteristics of a nozzle converging-diverging section has simple structure, strong stability, and is easy to disassemble and assemble, has wide application range, and can meet the automatic transfer of the nozzle converging-diverging section. The test product can be firmly clamped and fixed through the clamping assembly, and then the collection and flow guiding of the test medium during the test process can be realized through the liquid collecting assembly, so that the stability of the test tooling and the effectiveness and reliability of the test data are effectively improved.

[0026] 【2】The tray through hole is arranged in the middle of the tray, so that the smooth flow of the test medium can be ensured, and the accumulation of water in the test site can be avoided.

[0027] 【3】The protective gasket arranged on the connecting support can effectively avoid the bumping during the installation of the product.

[0028] 【4】The liquid collecting cylinder is designed as a flared structure, the inlet end is a large end of the flared structure, and the outlet end is a small end of the flared structure, so that the flow guiding effect of the test medium at the inlet section can be ensured, the application range of the tooling is improved, and the liquid flow test of products of the same type and multiple specifications can be performed.

[0029] 【5】The triangular plate reinforcing rib arranged at the middle connection of the cross clamping support effectively improves the stability of the test tooling, avoids the shaking during the test process, and affects the test results. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 It is a perspective view of an embodiment of the test tooling for testing the flow resistance characteristics of a nozzle converging-diverging section.

[0031] Figure 2 It is a structural schematic view of the fixed tray in the embodiment of the present application.

[0032] Figure 3 It is a structural schematic diagram of the support assembly in the embodiment of the present application.

[0033] Figure 4 It is a structural schematic diagram of the liquid collecting assembly in the embodiment of the present application.

[0034] Figure 5 It is a structural schematic diagram of the clamping assembly in the embodiment of the present application.

[0035] Reference signs:

[0036] 1-fixed tray, 2-support assembly, 3-liquid collecting assembly, 4-clamping assembly, 5-tray through hole, 6-first support bracket, 7-second support bracket, 8-liquid collecting cylinder, 9-connection bracket, 10-cross clamping bracket, 11-lifting lug stud, 12-half moon clamp, 13-limiting disc, 14-first transverse strut, 15-second transverse strut, 16-lifting lug mounting hole, 17-protection washer, 18-groove, 19-positioning column, 20-positioning hole, 21-clamping device, 22-liquid collecting cylinder bracket, 23-protection gasket, 24-triangle plate reinforcing rib, 25-tray bracket, 26-tray, 27-corner column, 28-support column, 29-fork way. DETAILED DESCRIPTION

[0037] As shown in Figure 1 , a test tool for testing the flow resistance characteristics of a nozzle converging-diverging section, comprising 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 large end of the nozzle converging-diverging section is connected with at least one inlet flange, and the small end is provided with a nozzle throat, one end of the inlet flange is connected with an external medium, and the other end is communicated with the large end of the converging-diverging section through a pipeline;

[0038] As shown in Figure 2 , the fixed tray 1 comprises a tray bracket 25 and a tray 26 fixed on the tray bracket 25, the tray bracket 25 is a hollow quadrilateral bracket, and the middle part of the tray 26 is provided with a tray through hole 5 for the flow of test medium; corner columns 27 are arranged on the four corners of the quadrilateral bracket, and support columns 28 are arranged on the middle part of each side of the quadrilateral bracket, and each support column 28 is provided with a fork way 29 adapted to an external fork for transferring the test tool, realizing the docking of the process equipment and the automatic transfer forklift, and at the same time, the fork way 29 can be used as a test bench during product testing, realizing the rapid positioning and withdrawal at the test station.

[0039] The support assembly 2 is used to realize the effective support and fixation between the clamping assembly 4, the liquid collecting assembly 3 and the fixed tray 1, as shown in 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, the top of the first support bracket 6 and the second support bracket 7 is provided with a groove 18, the groove 18 is provided with a positioning column 19, any side of each groove 18 is provided with a clamping device 21, the bottom of the first support bracket 6 and the second support bracket 7 is provided with a liquid collecting cylinder bracket 22, the outlet end of the liquid collecting cylinder 8 is arranged on the liquid collecting cylinder bracket 22, which is used to keep the stability of the liquid collecting assembly 3; the liquid collecting assembly 3 is used to realize the collection and flow guide of the medium in the product test process, such as Figure 4 As shown, the liquid collecting assembly 3 includes a liquid collecting cylinder 8 and a connecting bracket 9 symmetrically arranged on both sides of the inlet end of the liquid collecting cylinder 8, the fixed end of the two connecting brackets 9 is fixed on 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 at the position close to the tray through hole 5, the liquid collecting cylinder 8 is used for the collection and flow guide of the test medium; the fixed end of each connecting bracket 9 is embedded in the groove 18 and fixedly connected with the top of the first support bracket 6 and the second support bracket 7 through screws; each connecting bracket 9 is provided with a positioning hole 20 matched with the positioning column 19, which is used to quickly position and install the liquid collecting assembly 3 on the support assembly 2; then the connecting bracket 9 is fixed and clamped on the support assembly 2 through the clamping device 21, the position close to the inlet end of the liquid collecting cylinder 8 on the fixed end of each connecting bracket 9 is provided with a protective gasket 23, the protective gasket 23 is made of polyurethane and other anti-collision materials, which effectively protects the risk of collision in the product assembly process. The liquid collecting cylinder 8 is of an expanding structure, the inlet end is the large end of the expanding structure, and the outlet end is the small end of the expanding structure, and the liquid collecting cylinder 8 is made of thin steel plate material.

[0040] The clamping assembly 4 is used to realize the safe and reliable fixation of the converging-diverging section of the nozzle, and is quickly connected and fixed with the liquid collecting assembly 3 and the support assembly 2; as shown in Figure 5 As shown, the clamping assembly 4 includes a cross clamping bracket 10, two lug studs 11, a set of half moon clamps 12, and a limiting disc 13 fixed on the lower surface of the cross clamping bracket 10 through bolts, the limiting disc 13 is used to limit the large end of the converging-diverging section of the nozzle, the large end of the converging-diverging section of the nozzle is connected and locked on the lower surface of the limiting disc 13 through a set of half moon clamps 12 and two lug studs 11, the lower surface of the limiting disc 13 is also provided with a protective gasket 17, which is used to protect the connecting end of the large end of the converging-diverging section of the nozzle, so as to avoid the collision and deformation, and the limiting member and the protective gasket 17 are used to constrain the end surface of the converging-diverging section of the nozzle; the center axes of the tray through hole 5, the liquid collecting cylinder 8 and the limiting disc 13 coincide; the throat of the nozzle is arranged above the large end of the expanding structure of the liquid collecting cylinder 8, and the test medium is collected and guided by the liquid collecting cylinder 8 after being sprayed out through the throat of the nozzle.

[0041] The connecting end of the first transverse support rod 14 and the second transverse support rod 15 of the cross clamping support 10 is provided with a triangular plate reinforcing rib 24 for ensuring the stability and support strength of the cross clamping support 10; the two ends of the first transverse support rod 14 of the cross clamping support 10 are respectively connected with two connecting supports 9, the first transverse support rod 14 on the two sides of the limiting disc 13 is symmetrically provided with a lifting lug mounting hole 16, one end of the two lifting lug studs 11 is respectively mounted in the lifting lug mounting hole 16, the two lifting lug studs 11 symmetrically arranged on the two sides can ensure the lifting balance of the clamping assembly 4, and the other end is matched with a group of half moon clamps 12 for clamping and locking the converging-diverging section of the nozzle on the lower surface of the limiting disc 13.

[0042] The lifting lug stud is used for forming a fixed connection and locking between the converging-diverging section of the nozzle restrained by the group of half moon clamps 12 and the limiting disc 13, the group of half moon clamps 12 is used for clamping and restraining the converging-diverging section of the nozzle, the limiting disc 13 is made of stainless aluminum material, and the cross clamping support 10 is made of 80x60x5 rectangular steel, thereby effectively enhancing the stability and reliability of the device.

[0043] When the converging-diverging section of the nozzle is tested for flow resistance characteristics, the test tool in the embodiment is placed on a test bench, test medium is introduced into the test tool through an inlet flange, the test medium enters the large end of the converging-diverging section through the inlet flange on the converging-diverging section of the nozzle, is sprayed out through the throat of the nozzle, is collected by the liquid collecting cylinder 8, and is prevented from leaking, so that the flow resistance characteristics of the converging-diverging section of the nozzle are tested.

Claims

1. A test fixture for testing the flow resistance characteristics of a nozzle divergent section, characterized by: 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) respectively and 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) includes 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) includes 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 both 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 a nozzle divergent section according to claim 1, characterized in that: A protective washer (17) is also provided on the lower surface of the limiting plate (13) for protecting the connection end of the nozzle expansion section to prevent it from being bumped and deformed.

3. The 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. The 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 provided 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. The test fixture for testing the flow resistance characteristics of the nozzle divergent 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 a nozzle divergent 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 a nozzle divergent section according to claim 6, characterized in that: A triangular plate reinforcement 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. The test fixture for testing the flow resistance characteristics of the nozzle divergent 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), wherein the pallet support (25) is a hollow quadrilateral support; corner columns (27) are provided on the four corners of the quadrilateral support, and support columns (28) are provided in the middle of each side of the quadrilateral support. A fork (29) adapted to the fork rod of the external transfer equipment is provided between each support column (28) and the corner column (27) on its corresponding side, so as to be used for transferring the test tooling.

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

10. The test fixture for testing the flow resistance characteristics of the nozzle divergent 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.

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