Method and device for improving assembly precision of liquid rocket engine conduit

Abstract

The invention provides a method and device for improving the assembly precision of a liquid rocket engine duct, and belongs to the field of aerospace liquid engine manufacturing. The device is composed of an engine guide pipe connector position rubbing mechanism and an engine guide pipe welding and positioning mechanism, the installation position of a guide pipe on an engine is copied through the guide pipe connector position rubbing mechanism and transmitted to the guide pipe welding and positioning mechanism, and filing, positioning and welding production work of the guide pipe is completed through the guide pipe welding and positioning mechanism. Uniform positioning reference and firm fixation in the filing and welding process of the guide pipe are guaranteed, so that the guide pipe is tightly butted with component interfaces at two ends during assembly, and the assembly precision of the engine guide pipe is improved.

Description

Technical Field

[0001] The present invention relates to the field of assembly and manufacturing of liquid rocket engines, and particularly to a method and device for improving the assembly accuracy of ducts in liquid rocket engines. Background Art

[0002] The positioning and installation of ducts is an important link in the assembly process of liquid rocket engines. Ensuring that the ducts are tightly docked with the connected components and have qualified seals is a necessary condition for ensuring the assembly reliability of large-thrust liquid rocket engines.

[0003] Appendix Figure 1 The structure diagram of a certain high-temperature alloy duct for a certain type of liquid rocket engine is shown. This duct is a welded assembly, with the structural characteristics of short length, strong rigidity, and many welds. The cumulative welding deformation at several places during the welding process is extremely likely to cause changes in the interface positions at both ends of the duct, and it is relatively sensitive to assembly stress during assembly. When the axial tightness and skew tightness are not in place during the installation of the duct interface, it is easy to cause problems such as seal failure.

[0004] In order to solve the problem of the decline in assembly accuracy caused by the welding deformation of the engine ducts, it is urgent to study a method and device for improving the assembly accuracy of ducts in liquid rocket engines to ensure the assembly accuracy of the ducts in liquid rocket engines. Summary of the Invention

[0005] The technical problem solved by the present invention is: A method and device for improving the assembly accuracy of ducts in liquid rocket engines are proposed, which can solve the problem of the decline in assembly accuracy caused by the welding deformation of the ducts in liquid rocket engines.

[0006] The technical solution adopted by the present invention is: A device for improving the assembly accuracy of ducts in liquid rocket engines includes a duct interface position stamping mechanism and a duct welding positioning mechanism. The installation position of the duct on the engine is copied by the duct interface position stamping mechanism and transmitted to the duct welding positioning mechanism, and then the duct is installed through the duct welding positioning mechanism to complete the filing, positioning, and welding production work of the duct, ensuring the unity of the positioning reference during the filing and welding process of the duct.

[0007] Preferably, the duct interface position stamping mechanism of the engine includes a duct joint assembly and a spatial position adjustment assembly;

[0008] The duct joint assembly includes two flange joints with exactly the same sealing dimensions and connection dimensions as the two joints of the duct to be assembled

[0009] The spatial position adjustment assembly includes a telescopic part, a joint rotation part, and a joint assembly rotation part;

[0010] Two flange joints are respectively installed at both ends of the telescopic part through the rotating part of the joint assembly. The telescopic part is used to adjust the length along the axial direction to adjust the distance between the flange joints, and the rotating part of the joint assembly is used to adjust the spatial rotation angle of the flange joints; the rotating part of the joint is used to adjust the rotation of the flange joint along its own axial direction so that the connection holes of the flange joint are aligned with the connection hole positions of the engine assembly interface.

[0011] Preferably, the telescopic part is a threaded sleeve shaft or a polished rod sleeve shaft structure, and is positioned by a locking nut or a pin after adjustment.

[0012] Preferably, the rotating part of the joint assembly adopts 1 to 2 groups of pin shafts or spherical hinges to adjust the spatial rotation angle of the flange joint.

[0013] Preferably, the welding positioning mechanism consists of two parts, namely a conduit joint matching component and a welding position adjusting component;

[0014] Preferably, the conduit joint matching component includes two welding joints whose sealing dimensions and connection dimensions of the component joints connected to the engine conduit are exactly the same, and are matched and connected with the flange joints of the stamping mechanism;

[0015] Preferably, the welding position adjusting component includes a base, a welding joint rotating part and a welding joint assembly rotating part;

[0016] Preferably, the base is used to telescopically adjust the relative distance of welding; the welding joint rotating part adjusts the rotation of the welding joint along its own axial direction so that the connection holes of the welding joint are aligned with the connection hole positions of the flange joints of the conduit interface position stamping mechanism;

[0017] Preferably, the welding joint assembly rotating part is used to adjust the spatial rotation angle of the welding joint.

[0018] Preferably, the welding joint rotating part includes a threaded sleeve shaft and a locking nut. The screw rod at the bottom of the welding joint assembly rotating part is screwed tightly with the threaded sleeve shaft of the welding joint rotating part. When adjusting, loosen the locking nut and rotate the whole welding joint assembly rotating part to adjust the connection hole position of the welding joint, and lock it with the locking nut after adjustment.

[0019] Preferably, the welding joint assembly rotating part adopts 1 to 2 groups of pin shafts or spherical hinges to adjust the spatial rotation angle of the welding joint.

[0020] Preferably, the distance adjustment is realized by connecting two adjusting plates to the base, and the welding joint is installed on the adjusting plate.

[0021] A method for improving the assembly accuracy of liquid rocket engine conduits includes:

[0022] Connect the connection joints of the rubbing mechanism of the duct interface position to the engine component interface respectively, and ensure that the joint step sealing part is tightly fitted and the center of the flange connection hole is aligned by combining and adjusting the telescopic part, the joint rotating part and the joint component rotating part;

[0023] After the catheter interface position rubbing mechanism is adjusted, it is locked;

[0024] The connecting joints of the catheter interface position rubbing mechanism are respectively connected to the welding joints of the catheter joint matching assembly, and the welding joint is ensured to be closely aligned and fitted with the joint step sealing part of the catheter interface position rubbing mechanism by combining and adjusting the base, the welding joint rotating part and the welding joint assembly rotating part;

[0025] After the welding positioning mechanism is adjusted, it is locked;

[0026] Connect the engine duct joints to the welding joints of the welding positioning mechanism respectively to ensure that the step sealing parts are tightly aligned and fitted;

[0027] The filing, positioning welding and welding work of the middle straight pipe section of the engine duct joint are performed on the welding positioning mechanism, and the duct is disassembled from the welding positioning mechanism after the welding is cooled.

[0028] The beneficial effects of the present invention compared with the prior art are:

[0029] The present invention realizes the spatial position replication and positioning of the liquid rocket engine duct interface through a group of devices, so that the duct can be accurately positioned and installed after welding, ensuring that the joints at both ends of the duct are tightly connected with the component joints, eliminating the thermal correction rework process introduced by installation gap or welding deformation, and simultaneously improving the engine assembly accuracy and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the duct structure of a certain type of liquid oxygen-kerosene rocket engine;

[0031] Figure 2 This is a connection diagram of the conduit seal installation location;

[0032] Figure 3 It is a schematic diagram of the structure of the catheter interface position rubbing mechanism and the catheter welding positioning mechanism;

[0033] Figure 4 A schematic diagram of the production of a catheter welding positioning mechanism;

[0034] Description of the accompanying drawings:

[0035] 1—Catheter interface position rubbing mechanism; 2—Catheter welding positioning mechanism; 3—Schematic diagram of a certain catheter structure;

[0036] 1-1—Duct joint assembly; 1-2—Spatial position adjustment assembly;

[0037] 1-11—Duct joint assembly joint 1 (connection joint); 1-12—Duct joint assembly joint 2 (connection joint);

[0038] 1-21—Telescopic part; 1-22—Joint rotation part; 1-23—Joint assembly rotation part;

[0039] 2-1—Duct joint matching assembly; 2-2—Welding position adjustment assembly;

[0040] 2-11—Welding joint; 2-12—Welding joint;

[0041] 2-21—Base; 2-23—Welding joint rotation part; 2-22—Welding joint assembly rotation part;

[0042] 3-1—Duct joint 1; 3-2—Duct joint 2; 3-3—Duct straight pipe section. Specific embodiments

[0043] The following will further elaborate on the present invention in conjunction with the appended Figures 1-4 drawings and embodiments.

[0044] To more clearly show the purpose, technical solutions and advantages of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with this embodiment and the drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments.

[0045] Taking the inlet duct of the evaporator of a certain type of liquid oxygen kerosene rocket engine as an example, the duct structure schematic diagram is shown in the appended Figure 1 drawings. The duct is a welded assembly. In the figure, H1 and H2 represent the positions of the two welds of the duct. The joints 3-1 and 3-2 at both ends of the duct are flange step seal structures, which are respectively connected to the evaporator of the engine and the main pipeline joint.

[0046] Since there are large deviations in the assembly positions of the duct connection components at both ends of each engine on the engine, during duct production, the flange joints 3-1 and 3-2 at both ends of the duct need to be connected to the corresponding component interfaces, and the middle straight pipe section 3-3 is compared and filed during the whole machine state. After filing, the duct is welded. Since the heat input during duct welding will cause shrinkage or welding deformation, after accumulation, it will cause the relative positions of the flange interfaces at both ends to deviate from the filed state after duct welding, and axial deflection is likely to occur during installation, as shown in the appended Figure 2 drawings, which affects the sealing performance of the connection part. In severe cases, thermal correction is required to meet the assembly tightness requirements.

[0047] The present invention provides a method and device for improving the assembly accuracy of ducts in a liquid rocket engine. The device consists of a duct interface position stamping mechanism 1 and a duct welding positioning mechanism 2.

[0048] The stamping mechanism 1 is composed of two parts, namely a duct joint assembly 1-1 and a spatial position adjustment assembly 1-2. The joints 1-11 and 1-12 of the duct joint assembly are completely consistent with the sealing dimensions and connection dimensions of the joints 3-1 and 3-2 of the duct respectively, so as to simulate the assembly state of the duct on the whole machine. The spatial position adjustment assembly 1-2 includes a telescopic part 1-21, a joint rotation part 1-22 and a joint assembly rotation part 1-23. The telescopic part 1-21 can adjust the length along the axial direction to adjust the distance between the two ends of the joint. It can be a threaded sleeve shaft or a polished rod sleeve shaft structure. After adjustment, it is positioned by a locking nut or a pin. The joint rotation part 1-22 can adjust the joints 1-11 and 1-12 to rotate along the joint axis, so that the connection holes of the flange joint are aligned with the connection hole positions of the component interface. In this embodiment, the rotation and locking of the joint are realized through a threaded sleeve shaft and a locking nut. The joint assembly rotation part 1-23 is provided with a set of pin shafts connected to the joint assembly and can rotate around the axis of the pin shaft to adjust the spatial rotation angle of the joint.

[0049] The welding positioning mechanism 2 is composed of two parts, namely a duct joint matching assembly 2-1 and a welding position adjustment assembly 2-2. The sealing dimensions and connection dimensions of the component joints of the duct joint matching assembly 2-1 connected to the liquid rocket engine duct are completely consistent, and it is matched and connected with the joints 1-11 and 1-12 of the duct joint assembly of the stamping mechanism 1. The welding position adjustment assembly 2-2 includes a base 2-21, a welding joint rotation part 2-23 and a welding joint assembly rotation part 2-22. The base 2-21 can be telescopic. While meeting the welding fixation requirements, it can adjust the relative distance between the two joints 2-11 and 2-12 of the duct joint matching assembly 2-1. In this embodiment, the distance adjustment is realized by connecting two adjusting plates to the base 2-21.

[0050] The welding joint rotation part 2-23 can adjust the joints 2-11 and 2-12 to rotate along the joint axis, so that the connection holes of the flange joint are aligned with the connection hole positions of the joints 1-11 and 1-12. In this embodiment, the rotation and locking of the joint are realized through a threaded sleeve shaft and a locking nut. The welding joint assembly rotation part 2-22 is provided with a set of pin shafts connected to the joints 2-11 and 2-12 and can rotate around the axis of the pin shaft to adjust the spatial rotation angle of the joints 2-11 and 2-12. The screw at the bottom of the welding joint assembly rotation part is screwed tightly with the threaded sleeve shaft of the welding joint rotation part. During adjustment, the locking nut is loosened, and the whole welding joint assembly rotation part is rotated to adjust the connection hole position of the welding joint. After adjustment, it is locked by the locking nut.

[0051] A method for improving the assembly accuracy of ducts in a liquid rocket engine is as follows:

[0052] Step 1: Connect the joints 1-11 and 1-12 of the duct interface position stamping mechanism 1 to the engine evaporator interface and the main pipeline interface respectively. By combining and adjusting the telescopic part 1-21, the joint rotation part 1-22, and the joint assembly rotation part 1-23, ensure that the joints 1-11 and 1-12 are closely attached to the sealing part of the engine interface step, and the centers of the flange connection holes are aligned.

[0053] Step 2: After the adjustment of the duct interface position stamping mechanism 1 is completed, lock the duct interface position stamping mechanism 1 with three locking nuts to ensure that the relative positions of the joints 1-11 and 1-12 remain unchanged.

[0054] Step 3: Connect the joints 1-11 and 1-12 of the duct interface position stamping mechanism 1 to the joints 2-11 and 2-12 of the duct joint matching component 2-1 respectively. By combining and adjusting the base 2-21, the joint rotation part 2-23, and the joint assembly rotation part 2-22, ensure that the joints 2-11 and 2-12 are closely attached to the sealing part of the steps of the joints 1-11 and 1-12 of the duct interface position stamping mechanism 1, and the centers of the flange connection holes are aligned.

[0055] Step 4: After the adjustment of the welding positioning mechanism 2 is completed, lock the welding positioning mechanism 2 with three locking parts to ensure that the relative positions of the joints 2-11 and 2-12 remain unchanged.

[0056] Step 5: Connect the two ends of the engine duct, the joints 3-1 and 3-2, to the joints 2-11 and 2-12 of the welding positioning mechanism 2 respectively, ensuring that the sealing parts of the steps are closely attached and the centers of the flange connection holes are aligned, as shown in the appendix Figure 4 .

[0057] Step 6: Carry out filing, tack welding, and welding work on the middle straight pipe section 3-3 on the welding positioning mechanism 2. After the welding cools down, disassemble the duct 3 from the welding positioning mechanism 2, ensuring that the interface positions at both ends of the duct do not deform or shift during the welding process, so as to ensure that the duct is closely docked with the interface of the two end components during assembly and improve the assembly accuracy of the engine duct.

[0058] The above is only a preferred embodiment of the present invention, and does not impose any form of limitation on the present invention. Any simple modification or equivalent change made to the above embodiments based on the technical essence of the present invention falls within the protection scope of the present invention.

[0059] The present invention solves the problem of poor assembly accuracy caused by welding deformation of ducts in liquid rocket engines, realizes the spatial position replication and welding positioning of duct interfaces in liquid rocket engines, ensures the tight docking of the two ends of the ducts with the component joints after duct production, and improves the assembly accuracy and efficiency of the engine.

[0060] The parts not described in detail in the present invention belong to the common general knowledge of those skilled in the art.

Claims

1. A device for improving the assembly accuracy of a liquid rocket engine duct, characterized in that: It includes an engine duct interface position rubbing mechanism and a duct welding positioning mechanism. The duct interface position rubbing mechanism is used to copy the installation position of the duct on the engine and transfer it to the duct welding positioning mechanism. The duct is then installed through the duct welding positioning mechanism to complete the filing, positioning and welding production work of the duct, ensuring the unity of the positioning reference during the duct filing and welding processes.

2. The device according to claim 1, characterized in that: The engine duct interface position rubbing mechanism comprises a duct joint assembly and a spatial position adjustment assembly; The conduit joint assembly comprises two flange joints with sealing dimensions and connection dimensions that are completely consistent with the two joints of the conduit to be assembled. The spatial position adjustment assembly includes a telescopic portion, a joint rotating portion and a joint assembly rotating portion; The two flange joints are respectively installed at the two ends of the telescopic part through the joint assembly rotating part. The telescopic part is used to adjust the length along the axial direction to adjust the distance between the flange joints, and the joint assembly rotating part is used to adjust the spatial rotation angle of the flange joint; the joint rotating part is used to adjust the flange joint to rotate along its own axial direction so that the connecting hole of the flange joint is aligned with the connecting hole position of the engine assembly interface.

3. The device according to claim 2, characterized in that: The telescopic part is a threaded sleeve shaft or a polished rod sleeve shaft structure, and is positioned by a locking nut or a pin after adjustment.

4. The device according to claim 2, characterized in that: The rotating part of the joint assembly adopts 1-2 sets of pins or spherical hinges to adjust the spatial rotation angle of the flange joint.

5. The device according to claim 1, characterized in that: The welding positioning mechanism is composed of two parts, namely a catheter joint matching component and a welding position adjustment component; The conduit joint matching component includes two welding joints whose sealing dimensions and connection dimensions are completely consistent with those of the assembly joint connected to the engine conduit, and are matched and connected with the flange joint of the rubbing mechanism; The welding position adjustment assembly comprises a base, a welding joint rotating part and a welding joint assembly rotating part; The base is used to adjust the relative distance of welding by telescoping; the welding joint rotating part adjusts the welding joint to rotate along its own axial direction so that the connection hole of the welding joint is aligned with the connection hole position of the flange joint of the catheter interface position rubbing mechanism; The welding joint assembly rotating part is used to adjust the spatial rotation angle of the welding joint.

6. The device according to claim 5, characterized in that: The rotating part of the welding joint assembly adopts 1-2 sets of pins or spherical hinges to adjust the spatial rotation angle of the welding joint.

7. The device according to claim 5, characterized in that: The rotating part of the welding joint includes a threaded sleeve and a locking nut. The screw at the bottom of the rotating part of the welding joint assembly is screwed tightly to the threaded sleeve of the rotating part of the welding joint. When adjusting, the locking nut is loosened and the rotating part of the welding joint assembly is rotated as a whole to adjust the connection hole position of the welding joint. After adjustment, it is locked by the locking nut.

8. The device according to claim 5, characterized in that: The distance adjustment is achieved by connecting two adjustment plates on the base, on which the welding joint is mounted.

9. A method for improving the assembly accuracy of a liquid rocket engine duct, characterized in that include: Connect the connection joints of the rubbing mechanism of the duct interface position to the engine component interface respectively, and ensure that the joint step sealing part is tightly fitted and the center of the flange connection hole is aligned by combining and adjusting the telescopic part, the joint rotating part and the joint component rotating part; After the catheter interface position rubbing mechanism is adjusted, it is locked; The connecting joints of the catheter interface position rubbing mechanism are respectively connected to the welding joints of the catheter joint matching assembly, and the welding joint is ensured to be closely aligned and fitted with the joint step sealing part of the catheter interface position rubbing mechanism by combining and adjusting the base, the welding joint rotating part and the welding joint assembly rotating part; After the welding positioning mechanism is adjusted, it is locked; Connect the engine duct joints to the welding joints of the welding positioning mechanism respectively to ensure that the step sealing parts are tightly aligned and fitted; The filing, positioning welding and welding work of the middle straight pipe section of the engine duct joint are performed on the welding positioning mechanism, and the duct is disassembled from the welding positioning mechanism after the welding is cooled.

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