A diffuser processing tooling and processing method

Abstract

The present invention relates to the technical field of rocket engine test, and discloses a diffuser processing tooling and a processing method. The diffuser processing tooling includes: an annular plate structure with an opening, by adjusting the opening width and changing the outer wall diameter, the outer wall is fitted to the inner cylinder of the diffuser; a strain measurement structure is arranged on the annular plate structure to obtain the initial strain of the annular plate structure in the direction perpendicular to the central axis of the annular plate structure, and to obtain the strain of the annular plate structure in the direction perpendicular to the central axis of the annular plate structure; during the period of successively installing longitudinal bars, outer cylinders and reinforcing ring bars on the inner cylinder, by adjusting the opening width and changing the outer wall diameter of the annular plate structure, it is ensured that the strain of the annular plate structure obtained by the strain measurement structure in the direction perpendicular to the central axis of the annular plate structure is the same as the initial strain. The present application monitors the strain of the annular plate structure in real time through the strain measurement structure, and combines with adjusting the opening width to prevent the deformation of the thin-walled inner cylinder and ensure the profile accuracy of the diffuser.

Description

Technical Field

[0001] The present invention relates to the technical field of rocket engine tests, and particularly relates to a diffuser processing tooling and a processing method. Background Art

[0002] Rocket engines generally conduct high-altitude simulation tests on high-altitude simulation test benches. The diffuser is one of the important core components of the high-altitude simulation test bench. During high-altitude simulation tests, the diffuser needs to withstand high-temperature gas above 3000°C generated by the rocket engine. To prevent the diffuser from being ablated by the high-temperature gas, the diffuser generally adopts a water-cooled structure.

[0003] With the continuous increase in the thrust of existing rocket engines, both the pressure and total temperature of the high-temperature gas are continuously increasing; in order to improve the cooling effect of the diffuser wall surface, the inner wall thickness of the diffuser is getting smaller and smaller, the water pressure of the water-cooled structure is continuously increasing, and the pressure of the cooling water borne by the diffuser is also getting higher and higher, resulting in difficulties in processing existing diffusers, and the surface accuracy of the diffuser is difficult to meet the aerodynamic performance requirements of rocket engine tests. Summary of the Invention

[0004] In view of this, the present invention provides a diffuser processing tooling and a processing method to solve the problems that with the continuous increase in the thrust of rocket engines, both the pressure and total temperature of the high-temperature gas are continuously increasing; in order to improve the cooling effect of the diffuser wall surface, the inner wall thickness of the diffuser is getting smaller and smaller, the water pressure of the water-cooled structure is continuously increasing, and the pressure of the cooling water borne by the diffuser is also getting higher and higher, resulting in difficulties in processing existing diffusers, and the surface accuracy of the diffuser is difficult to meet the aerodynamic performance requirements of rocket engine tests.

[0005] In a first aspect, the present invention provides a diffuser processing tooling suitable for processing a diffuser, where the diffuser includes: an inner cylinder and an outer cylinder sleeved at intervals; a gas passage is formed inside the inner cylinder; the inner cylinder and the outer cylinder are connected by a plurality of longitudinal bars arranged at intervals in the circumferential direction, and the plurality of longitudinal bars divide the annular space between the inner cylinder and the outer cylinder into a plurality of cooling water flow channels; the longitudinal bars are arranged along the axis direction of the diffuser; a reinforcing ring rib is provided around the outer circumference of the outer cylinder, and the diffuser processing tooling includes:

[0006] At least one annular plate structure with an opening, which is suitable for changing the diameter of the outer wall of the annular plate structure by adjusting the width of the opening, so that the outer wall of the annular plate structure fits and installs into the inner cylinder; the central axis of the annular plate structure is parallel to the axis of the inner cylinder; both the thickness of the annular plate structure and the difference between the radius of the outer wall and the radius of the inner wall of the annular plate structure are greater than 5 times the thickness of the inner cylinder;

[0007] A strain measurement structure is provided on the annular plate structure. The strain measurement structure is adapted to obtain the initial strain of the annular plate structure in the direction perpendicular to the central axis of the annular plate structure when it is installed in the inner cylinder, and to obtain the strain of the annular plate structure in the direction perpendicular to the central axis of the annular plate structure in real time.

[0008] The diffuser processing tooling is adapted to, during the period of successively installing the longitudinal bars, the outer cylinder, and the reinforcing ring bars on the inner cylinder, change the diameter of the outer wall of the annular plate structure by adjusting the width of the opening, so as to ensure that the strain of the annular plate structure obtained by the strain measurement structure in the direction perpendicular to the central axis of the annular plate structure is the same as the initial strain. Beneficial effects: By adopting the above technical solution in this application, when processing the diffuser, the inner cylinder is supported by the annular plate structure, and then the longitudinal bars, the outer cylinder, and the reinforcing ring bars are installed, which is convenient for processing the diffuser; moreover, the strain of the annular plate structure is monitored in real time through the strain measurement structure, and combined with adjusting the width of the opening, deformation of the thin-walled inner cylinder is prevented, thereby ensuring the surface accuracy of the entire diffuser.

[0009] Optionally, the strain measurement structure is located on the annular plate structure at a position opposite to the opening. Beneficial effects: By adopting the above technical solution in this application, the strain measurement structure is arranged at the position on the annular plate structure that is most sensitive to strain, and thus can sensitively, quickly, and accurately obtain the strain of the annular plate structure, and accurately and reliably prevent deformation of the inner cylinder.

[0010] Optionally, there are n annular plate structures, and there are n strain measurement structures correspondingly installed on the annular plate structures, where n is a natural number not less than 2; the n annular plate structures are arranged at intervals and are attached to the inside of the inner cylinder. Beneficial effects: By adopting the above technical solution in this application, deformation control is carried out along the entire length direction of the inner cylinder to prevent deformation of the inner cylinder.

[0011] Optionally, the n openings are evenly distributed about the axis of the diffuser. Beneficial effects: By adopting the above technical solution in this application, reliable deformation control is carried out simultaneously along the entire length direction and the circumferential direction of the inner cylinder to prevent deformation of the inner cylinder.

[0012] Optionally, the n annular plate structures are arranged at equal intervals. Beneficial effects: By adopting the above technical solution in this application, the deformation control of the inner cylinder is more effective by uniformly arranging the annular plate structures.

[0013] Optionally, a force application and adjustment structure is provided at the opening, and the force application and adjustment structure is adapted to adjust the width of the opening.

[0014] Optionally, mounting grooves are respectively provided on the opposite two side walls at the opening, and the force application and adjustment structure is arranged in the opposite two mounting grooves. Beneficial effects: By adopting the above technical solution in this application, the force application and adjustment structure can be conveniently, reliably, and firmly arranged by providing the mounting grooves.

[0015] Optionally, the strain measurement structure is a strain gauge, and the strain gauge is disposed on the inner wall of the annular plate structure; the force application and adjustment structure is a jack.

[0016] Optionally, the outer cylinder is formed by connecting a plurality of plate members around; during the period between installing each longitudinal bar and connecting each plate member, by adjusting the width of the opening, the diameter of the outer wall of the annular plate structure is changed to ensure that the strain of the annular plate structure obtained by the strain measurement structure is the same as the initial strain. Beneficial effects: By adopting the above technical solutions, the present application can more accurately and reliably monitor the strain of the annular plate structure in real time, and in combination with adjusting the width of the opening, prevent the deformation of the thin-walled inner cylinder, thereby ensuring the surface accuracy of the diffuser.

[0017] In a second aspect, the present invention further provides a diffuser processing method, which applies the diffuser processing tooling, and includes:

[0018] Machining the inner cylinder;

[0019] Adjust the width of the opening, and fit and install the outer wall of the annular plate structure of the diffuser processing tooling into the inner cylinder;

[0020] Record the initial strain in the direction perpendicular to the central axis of the annular plate structure through the strain measurement structure;

[0021] Install the longitudinal bars. When the longitudinal bars are installed by welding, weld the longitudinal bars one by one, and when the welded longitudinal bars are cooled, then weld the next longitudinal bar;

[0022] Adjust the width of the opening to ensure that the strain of the annular plate structure obtained by the strain measurement structure in the direction perpendicular to the central axis of the annular plate structure is the same as the initial strain;

[0023] Install the outer cylinder;

[0024] Adjust the width of the opening to ensure that the strain of the annular plate structure obtained by the strain measurement structure in the direction perpendicular to the central axis of the annular plate structure is the same as the initial strain;

[0025] Install the reinforcing ring bars;

[0026] Adjust and reduce the width of the opening, and remove the diffuser processing tooling. Beneficial effects: By adopting the above technical solutions, when processing the diffuser, the inner cylinder is supported by the annular plate structure, and then the longitudinal bars, the outer cylinder and the reinforcing ring bars are installed, which is convenient for processing the diffuser; and, through the strain measurement structure, the strain of the annular plate structure is monitored in real time, and in combination with adjusting the width of the opening, the deformation of the thin-walled inner cylinder is prevented, thereby ensuring the surface accuracy of the entire diffuser. Description of the Drawings

[0027] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0028] Figure 1 Schematic three-dimensional structure diagram of the diffuser provided in the embodiment of the present invention;

[0029] Figure 2 Schematic cross-sectional structure diagram of the diffuser provided in the embodiment of the present invention;

[0030] Figure 3 Schematic diagram of a partially enlarged structure of the cross-section of the diffuser provided in the embodiment of the present invention;

[0031] Figure 4 Schematic three-dimensional structure diagram of the diffuser processing tooling provided in the embodiment of the present invention;

[0032] Figure 5 Schematic three-dimensional structure diagram of the diffuser processing tooling installed on the diffuser provided in the embodiment of the present invention;

[0033] Figure 6 Schematic layout diagram of four diffuser processing toolings provided in the embodiment of the present invention.

[0034] Explanation of reference numerals:

[0035] 1. Inner cylinder; 2. Outer cylinder; 3. Gas channel; 4. Longitudinal rib; 5. Cooling water flow channel; 6. Reinforcing ring rib; 7. Annular plate structure; 8. Opening; 9. Outer wall; 10. Strain measurement structure; 11. Force application adjustment structure; 12. Inner wall; 13. Plate member; 14. Installation groove. Specific embodiments

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0037] As Figures 1 to 6 shown in a specific embodiment of the diffuser processing tooling, the diffuser processing tooling is suitable for processing a diffuser. The diffuser described in this application is used in the high-altitude simulation test of a rocket engine.

[0038] As Figures 1 to 3 shown, the diffuser includes: an inner cylinder 1 and an outer cylinder 2 arranged at intervals; a gas channel 3 is formed inside the inner cylinder 1; high-temperature gas generated by a rocket engine is adapted to flow in the gas channel 3. The inner cylinder 1 and the outer cylinder 2 are connected by a plurality of longitudinal ribs 4 arranged at circumferential intervals, and the plurality of longitudinal ribs 4 divide the annular space between the inner cylinder 1 and the outer cylinder 2 into a plurality of cooling water channels 5; the longitudinal ribs 4 are arranged along the axis of the diffuser; a reinforcing ring rib 6 is arranged around the outer circumference of the outer cylinder 2, specifically, the reinforcing ring rib 6 is welded to the outer cylinder 2. The outer cylinder 2 is a conical cylinder or a cylindrical cylinder. The reinforcing ring rib 6 is used to enhance the stiffness of the outer cylinder 2 and the overall stiffness of the entire diffuser.

[0039] As Figure 4 and Figure 5 shown, the diffuser processing tooling of the present application includes: at least one annular plate structure 7 provided with an opening 8 and a strain measurement structure 10.

[0040] The annular plate structure 7 is adapted to change the diameter of the outer wall 9 of the annular plate structure 7 by adjusting the width of the opening 8, so that the outer wall 9 of the annular plate structure 7 fits and installs into the inner cylinder 1. The diameter of the outer wall 9 of the annular plate structure 7 is the same as the diameter of the gas channel 3. The central axis of the annular plate structure 7 is parallel to the axis of the inner cylinder 1; of course, the central axis of the annular plate structure 7 and the axis of the inner cylinder 1 can be collinear. The thickness of the annular plate structure 7 and the difference between the radius of the outer wall 9 and the radius of the inner wall 12 of the annular plate structure 7 are both greater than 5 times the thickness of the inner cylinder 1; that is, the thickness of the annular plate structure 7 is greater than 5 times the thickness of the inner cylinder 1, and the difference between the radius of the outer wall 9 and the radius of the inner wall 12 of the annular plate structure 7 is also greater than 5 times the thickness of the inner cylinder 1. The strain measurement structure 10 is arranged on the annular plate structure 7, and the strain measurement structure 10 is adapted to obtain the initial strain of the annular plate structure 7 in the direction perpendicular to the central axis of the annular plate structure 7 when installed in the inner cylinder 1, and to obtain the strain of the annular plate structure 7 in the direction perpendicular to the central axis of the annular plate structure 7 in real time. The diffuser processing tooling is adapted to ensure that the strain of the annular plate structure 7 in the direction perpendicular to the central axis of the annular plate structure 7 obtained by the strain measurement structure 10 is the same as the initial strain by adjusting the width of the opening 8 and changing the diameter of the outer wall 9 of the annular plate structure 7 during the period when the longitudinal rib 4, the outer cylinder 2 and the reinforcing ring rib 6 are sequentially installed on the inner cylinder 1.

[0041] Further, as Figure 4 shown, the strain measurement structure 10 is located at a position on the annular plate structure 7 opposite to the opening 8.

[0042] Further, as Figure 6As shown, there are n annular plate structures 7, and there are n strain measurement structures 10 correspondingly installed on the annular plate structures 7, where n is a natural number not less than 2; the n annular plate structures 7 are arranged at intervals and are attached to the inner cylinder 1. In Figure 6 the number of the annular plate structures 7 is 4.

[0043] Furthermore, as Figure 6 shown, the n openings 8 are evenly distributed about the axis of the diffuser. That is, in the cross-section of the diffuser, the included angle between the two straight lines formed by connecting the centers of the diffuser with two adjacent openings 8 respectively in the projection on the same cross-section of the diffuser is 360 / n degrees.

[0044] Furthermore, the n annular plate structures 7 are arranged at equal intervals. Specifically, an annular plate structure 7 can be installed every 100 millimeters.

[0045] Specifically, as Figure 4 shown, a force application adjustment structure 11 is provided at the opening 8, and the force application adjustment structure 11 is adapted to adjust the width of the opening 8.

[0046] Furthermore, as Figure 4 and Figure 5 shown, mounting grooves 14 are respectively provided on the opposite two side walls at the opening 8, and the force application adjustment structure 11 is arranged in the two opposite mounting grooves 14.

[0047] Specifically, as Figure 4 shown, the strain measurement structure 10 is a strain gauge, and the strain gauge is arranged on the inner wall 12 of the annular plate structure 7; the force application adjustment structure 11 is a jack. The mounting groove 14 can be a rectangular groove for placing the jack. When the jack extends, the diameter of the outer wall 9 of the annular plate structure 7 becomes larger; when the jack shortens, the diameter of the outer wall 9 of the annular plate structure 7 becomes smaller. The pasting direction of the strain gauge is perpendicular to the central axis direction of the annular plate structure 7 for detecting whether the annular plate structure 7 is deformed.

[0048] As Figure 3As shown, the outer cylinder 2 is formed by connecting multiple plate members 13 around. The plate member 13 is strip-shaped. Further, during the period between installing each longitudinal bar 4 and connecting each plate member 13, by adjusting the width of the opening 8, the diameter of the outer wall 9 of the annular plate structure 7 is changed to ensure that the strain of the annular plate structure 7 obtained by the strain measurement structure 10 is the same as the initial strain. The position where the strain gauges are pasted is the position where the annular plate structure 7 may generate the maximum strain and is the most sensitive to the deformation of the annular plate structure 7. When the thickness of the annular plate structure 7 reaches more than 80 mm, the radius difference between the inner wall 12 and the outer wall 9 of the annular plate structure 7 also reaches more than 80 mm. The material of the annular plate structure 7 can be high-carbon steel to ensure that the annular plate structure 7 has relatively high stiffness.

[0049] The present application also provides a diffuser processing method, which applies the diffuser processing tooling and includes the following steps:

[0050] S1. Machine the inner cylinder 1; specifically, the inner cylinder 1 can be machined by steel plate rolling and welding processes to ensure that the diameter, roundness of the cross-section, length, etc. of the inner cylinder 1 conform to the shape required by the design.

[0051] S2. Adjust the width of the opening 8 and fit and install the outer wall 9 of the annular plate structure 7 of the diffuser processing tooling into the inner cylinder 1; specifically, the length of the jack can be adjusted to be shortened to reduce the diameter of the outer wall 9 of the annular plate structure 7 and install it into the inner cylinder 1, and then the length of the jack is adjusted to be extended to ensure that the outer wall 9 of the annular plate structure 7 is in contact with the inner cylinder 1.

[0052] S3. Record the initial strain in the direction perpendicular to the central axis of the annular plate structure 7 through the strain measurement structure 10;

[0053] S4. Install the longitudinal bars 4; specifically, the longitudinal bars 4 are welded and installed on the outer periphery of the inner cylinder 1, and are welded one by one. When the longitudinal bars 4 are installed by welding, after the welded longitudinal bar 4 is fully cooled, the next longitudinal bar 4 is welded.

[0054] S5. Adjust the width of the opening 8 to ensure that the strain of the annular plate structure 7 obtained by the strain measurement structure 10 in the direction perpendicular to the central axis of the annular plate structure 7 is the same as the initial strain; further, after welding and installing each longitudinal bar 4, when the temperature at the weld joint drops to the ambient temperature, adjust the length of the jack to ensure that the strain of the annular plate structure 7 obtained by the strain measurement structure 10 in the direction perpendicular to the central axis of the annular plate structure 7 is the same as the initial strain until all the longitudinal bars 4 are welded and installed.

[0055] S6. Install the outer cylinder 2; specifically, the plate members 13 are welded one by one on every two adjacent longitudinal bars 4.

[0056] Adjust the width of the opening 8 in S7 to ensure that the strain of the annular plate structure 7 obtained by the strain measurement structure 10 in the direction perpendicular to the central axis of the annular plate structure 7 is the same as the initial strain; further, after welding and installing each plate member 13, when the temperature at the weld joint has dropped to the ambient temperature, adjust the length of the jack to ensure that the strain of the annular plate structure 7 obtained by the strain measurement structure 10 in the direction perpendicular to the central axis of the annular plate structure 7 is the same as the initial strain until the installation of all the plate members 13 is completed by welding.

[0057] S8. Install the reinforcing ring rib 6, specifically, it can be installed by a welding machine.

[0058] S9. Adjust and reduce the width of the opening 8 and remove the processing tooling for the diffuser; specifically, when the temperature at the weld joint for welding the reinforcing ring rib 6 has dropped to the ambient temperature, adjust and shorten the length of the jack and remove the processing tooling for the diffuser.

[0059] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A diffuser processing tool, suitable for processing a diffuser, the diffuser comprising: An inner cylinder (1) and an outer cylinder (2) are arranged at intervals; a gas passage (3) is formed inside the inner cylinder (1); the inner cylinder (1) and the outer cylinder (2) are connected by a plurality of longitudinal ribs (4) arranged at intervals along the circumferential direction, and the plurality of longitudinal ribs (4) divide the annular space between the inner cylinder (1) and the outer cylinder (2) into a plurality of cooling water flow channels (5); the longitudinal ribs (4) are arranged along the axial direction of the diffuser; and reinforcing annular ribs (6) are arranged around the outer circumference of the outer cylinder (2), characterized in that they include: at least one annular plate structure (7) provided with an opening (8), adapted to change the diameter of an outer wall (9) of the annular plate structure (7) by adjusting the width of the opening (8), so that the outer wall (9) of the annular plate structure (7) is fitted into the inner cylinder (1); the central axis of the annular plate structure (7) is parallel to the axis of the inner cylinder (1); the thickness of the annular plate structure (7), and the difference between the radius of the outer wall (9) and the radius of the inner wall (12) of the annular plate structure (7), are both greater than 5 times the thickness of the inner cylinder (1); a strain measurement structure (10) arranged on the annular plate structure (7), the strain measurement structure (10) being suitable for obtaining the initial strain of the annular plate structure (7) along a direction perpendicular to the central axis of the annular plate structure (7) when the annular plate structure (7) is installed in the inner cylinder (1), and obtaining the strain of the annular plate structure (7) along a direction perpendicular to the central axis of the annular plate structure (7) in real time; The diffuser processing tool is suitable for sequentially installing the longitudinal ribs (4), the outer cylinder (2) and the reinforcing annular ribs (6) on the inner cylinder (1), and changing the diameter of the outer wall (9) of the annular plate structure (7) by adjusting the width of the opening (8), so as to ensure that the strain of the annular plate structure (7) obtained by the strain measurement structure (10) in a direction perpendicular to the central axis of the annular plate structure (7) is the same as the initial strain; The strain measurement structure (10) is located on the annular plate structure (7) at a position opposite to the opening (8); There are n annular plate structures (7), and n strain measurement structures (10) are installed on the annular plate structures (7) accordingly, wherein n is a natural number not less than 2; the n annular plate structures (7) are arranged at intervals and fit in the inner cylinder (1); The n openings (8) are evenly distributed about the axis of the diffuser.

2. The diffuser processing tool according to claim 1, characterized in that: The n annular plate structures (7) are arranged at equal intervals.

3. The diffuser processing tool according to claim 1 or 2, characterized in that: A force adjustment structure (11) is provided at the opening (8), and the force adjustment structure (11) is suitable for adjusting the width of the opening (8).

4. The diffuser processing tooling according to claim 3, characterized in that: Mounting grooves (14) are respectively provided on two opposite side walls of the opening (8), and the force adjustment structure (11) is arranged in the two opposite mounting grooves (14).

5. The diffuser processing tool according to claim 4, characterized in that: The strain measurement structure (10) is a strain gauge, and the strain gauge is arranged on the inner wall (12) of the annular plate structure (7); and the force adjustment structure (11) is a jack.

6. The diffuser processing tool according to claim 1 or 2, characterized in that: The outer cylinder (2) is formed by connecting a plurality of plate members (13) around each other; between the installation of each longitudinal rib (4) and the connection between each plate member (13), the diameter of the outer wall (9) of the annular plate structure (7) is changed by adjusting the width of the opening (8), thereby ensuring that the strain of the annular plate structure (7) obtained by the strain measurement structure (10) is the same as the initial strain.

7. A diffuser processing method, using the diffuser processing tooling according to any one of claims 1 to 6, characterized in that: include: Processing the inner cylinder (1); The width of the opening (8) is adjusted, and the outer wall (9) of the annular plate structure (7) of the diffuser processing tooling is fitted into the inner cylinder (1); Recording the initial strain along the direction perpendicular to the central axis of the annular plate structure (7) by means of a strain measuring structure (10); Installing the longitudinal reinforcement (4), when the longitudinal reinforcement (4) is installed by welding, welding the longitudinal reinforcement (4) one by one, and after the welded longitudinal reinforcement (4) cools down, welding the next longitudinal reinforcement (4); Adjusting the width of the opening (8) to ensure that the strain of the annular plate structure (7) obtained by the strain measurement structure (10) in a direction perpendicular to the central axis of the annular plate structure (7) is the same as the initial strain; Install the outer cylinder (2); Adjusting the width of the opening (8) to ensure that the strain of the annular plate structure (7) obtained by the strain measurement structure (10) in a direction perpendicular to the central axis of the annular plate structure (7) is the same as the initial strain; Install reinforcing ring ribs (6); Adjust and reduce the width of the opening (8) and remove the diffuser processing tooling.

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