A method and device for improving the assembly accuracy of a liquid rocket engine duct

Abstract

The application provides a method and device for improving the assembly precision of a liquid rocket engine conduit, and belongs to the field of aerospace liquid engine manufacturing. The device is composed of an engine conduit interface position transfer mechanism and an engine conduit welding positioning mechanism. The installation position of the conduit on the engine is copied by the conduit interface position transfer mechanism and is transmitted to the conduit welding positioning mechanism. The conduit is then polished, positioned and welded by the conduit welding positioning mechanism, so that the positioning reference of the polishing and welding process is unified and fixed firmly, thereby ensuring that the conduit is tightly connected with the two end assemblies during assembly, and the assembly precision of the engine conduit is improved.

Description

Technical Field

[0001] This invention relates to the field of liquid rocket engine assembly and manufacturing, and more specifically, to a method and apparatus for improving the assembly accuracy of ducts in liquid rocket engines. Background Technology

[0002] The positioning and installation of the duct is a crucial step in the assembly process of a liquid rocket engine. Ensuring that the duct is tightly connected to its connected components and that the seal is adequate is a necessary condition for guaranteeing the assembly reliability of a high-thrust liquid rocket engine.

[0003] Appendix Figure 1 This diagram illustrates the structure of a high-temperature alloy conduit for a certain type of liquid rocket engine. This conduit is a welded assembly, characterized by its short length, high rigidity, and numerous welds. During the welding process, cumulative welding deformation at several points can easily cause changes in the positions of the interfaces at both ends of the conduit. Furthermore, it is highly sensitive to assembly stress during assembly. If the axial tightness or misalignment tightness is not in place during the installation of the conduit interfaces, it can easily lead to sealing failure.

[0004] To address the problem of decreased assembly accuracy caused by welding deformation of engine ducts, it is urgent to research a method and device for improving the assembly accuracy of liquid rocket engine ducts, so as to ensure the assembly accuracy of liquid rocket engine ducts. Summary of the Invention

[0005] The technical problem solved by this invention is to provide a method and apparatus for improving the assembly accuracy of ducts in liquid rocket engines, which can solve the problem of decreased assembly accuracy caused by welding deformation of ducts in liquid rocket engines.

[0006] The solution of the present invention is: a device for improving the assembly accuracy of liquid rocket engine ducts, including an engine duct interface position imprinting mechanism and a duct welding positioning mechanism. The duct interface position imprinting mechanism copies the installation position of the duct on the engine and transfers it to the duct welding positioning mechanism. The duct is then installed by the duct welding positioning mechanism, completing the filing, positioning and welding production of the duct, and ensuring that the positioning reference is consistent during the filing and welding process of the duct.

[0007] Preferably, the engine duct interface position imprinting mechanism includes a duct connector assembly and a spatial position adjustment assembly;

[0008] The catheter connector assembly includes two flange connectors whose sealing and connection dimensions are completely identical to the two connectors of the catheter to be assembled.

[0009] The spatial position adjustment component includes a telescopic part, a connector rotating part, and a connector assembly rotating part;

[0010] Two flange joints are respectively installed at both ends of the telescopic part via a 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. The joint assembly rotating part is used to adjust the spatial rotation angle of the flange joints. The joint rotating part is used to adjust the flange joints to rotate along their own axial direction so that the connection hole of the flange joint is aligned with the link hole of the engine component interface.

[0011] Preferably, the telescopic part is a threaded sleeve or a smooth rod sleeve structure, and is positioned by locking nuts or pins after adjustment.

[0012] Preferably, the rotating part of the joint assembly uses 1 to 2 sets of pins or ball hinges to adjust the spatial rotation angle of the flange joint.

[0013] Preferably, the welding positioning mechanism consists of two parts: a conduit connector matching assembly and a welding position adjustment assembly.

[0014] Preferably, the conduit connector matching assembly includes two welded joints with completely identical sealing and connection dimensions to the component joint connected to the engine conduit, which are matched and connected to the flange joint of the imprinting mechanism;

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

[0016] Preferably, the base is used to extend and retract to adjust the relative distance of the welding; the welding joint rotating part adjusts the welding joint to rotate along its own axis so that the connection hole of the welding joint is aligned with the connection hole of the flange joint of the conduit interface position imprinting mechanism.

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

[0018] Preferably, the rotating part of the welding joint includes a threaded sleeve shaft and a locking nut. The screw at the bottom of the rotating part of the welding joint assembly is screwed tightly connected to the threaded sleeve shaft of the rotating part of the welding joint. During adjustment, the locking nut is loosened, and the entire rotating part of the welding joint assembly is rotated to adjust the connection hole position of the welding joint. After adjustment, the locking nut is used to lock it.

[0019] Preferably, the rotating part of the welding joint assembly uses 1 to 2 sets of pins or spherical hinges to adjust the spatial rotation angle of the welding joint.

[0020] Preferably, the distance is adjusted by connecting two adjustment plates to the base, and the welded joint is installed on the adjustment plates.

[0021] A method for improving the assembly accuracy of ducts in liquid rocket engines includes:

[0022] Connect the connecting joints of the duct interface position imprinting mechanism to the engine component interface respectively. By combining and adjusting the telescopic part, the joint rotation part and the joint component rotation part, ensure that the joint step sealing part is tightly fitted and the center of the flange connection hole is aligned.

[0023] After the catheter interface location imprinting mechanism is adjusted, it is locked.

[0024] Connect the connecting joints of the catheter interface position imprinting mechanism to the welding joints of the catheter joint matching assembly. By combining the adjusting base, the rotating part of the welding joint and the rotating part of the welding joint assembly, ensure that the welding joint and the sealing part of the joint step of the catheter interface position imprinting mechanism are tightly aligned and fitted.

[0025] After the welding positioning mechanism is adjusted, it should be locked.

[0026] Connect the engine duct connectors to the welding joints of the welding positioning mechanism to ensure that the stepped sealing parts are tightly aligned and fitted.

[0027] The engine duct connector straight section is filed, tack welded, and welded on the welding positioning mechanism until the welding cools down, at which point the duct is removed from the welding positioning mechanism.

[0028] The advantages of this invention compared to the prior art are:

[0029] This invention achieves spatial replication and positioning of the duct interface of a liquid rocket engine through a set of devices, enabling precise positioning and installation of the duct after welding, ensuring tight connection between the duct end joints and component joints, eliminating the rework process caused by installation gaps or welding deformation, and simultaneously improving the assembly accuracy and efficiency of the engine. Attached Figure Description

[0030] Figure 1 A schematic diagram of the conduit structure for a certain type of liquid oxygen / kerosene rocket engine;

[0031] Figure 2 Schematic diagram of the connection of the conduit sealing installation part;

[0032] Figure 3 A schematic diagram of the catheter interface location tracing mechanism and the catheter welding positioning mechanism;

[0033] Figure 4 A schematic diagram of the catheter being produced in the catheter welding and positioning mechanism;

[0034] Explanation of reference numerals in the attached diagram:

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

[0036] 1-1—Diathenole connector assembly; 1-2—Spatial position adjustment assembly;

[0037] 1-11—Catheter connector assembly connector 1 (connecting connector); 1-12—Catheter connector assembly connector 2 (connecting connector);

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

[0039] 2-1—Conduit fitting assembly; 2-2—Welding position adjustment assembly;

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

[0041] 2-21—Base; 2-23—Rotating part of welded joint; 2-22—Rotating part of welded joint assembly;

[0042] 3-1—Catheter connector 1; 3-2—Catheter connector 2; 3-3—Straight section of catheter. Detailed Implementation

[0043] The following is in conjunction with the appendix Figure 1-4 The present invention will be further illustrated by the embodiments.

[0044] To more clearly demonstrate the purpose, technical solution, 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 the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments.

[0045] Taking the inlet duct of the evaporator of a certain type of liquid oxygen kerosene rocket engine as an example, the schematic diagram of the duct structure is attached. Figure 1 The conduit is a welded assembly. In the figure, H1 and H2 represent the positions of the two weld seams of the conduit. The connectors 3-1 and 3-2 at both ends of the conduit are flange stepped sealing structures, which are connected to the evaporator of the engine and the main pipeline connector, respectively.

[0046] Because the assembly positions of the connecting components at both ends of the duct on each engine vary significantly, 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. The intermediate straight pipe section 3-3 is then filed and repaired in the overall engine state before welding. Due to heat input during duct welding, shrinkage or deformation can occur. Over time, this can lead to a deviation in the relative positions of the flange interfaces at both ends after welding, resulting in axial misalignment during installation. (See attached image.) Figure 2 As shown, this affects the sealing performance of the connection parts, and in severe cases, thermal correction is required to meet the assembly tightness requirements.

[0047] This invention proposes a method and apparatus for improving the assembly accuracy of ducts in liquid rocket engines. The apparatus consists of an engine duct interface position imprinting mechanism 1 and a duct welding positioning mechanism 2.

[0048] The imprinting mechanism 1 consists of two parts: a conduit connector assembly 1-1 and a spatial position adjustment assembly 1-2. The connectors 1-11 and 1-12 of the conduit connector assembly have sealing and connection dimensions completely identical to the connectors 3-1 and 3-2 of the conduit, simulating the assembly state of the conduit on the whole machine. The spatial position adjustment assembly 1-2 includes a telescopic part 1-21, a connector rotating part 1-22, and a connector assembly rotating part 1-23. The telescopic part 1-21 can adjust its length axially to adjust the distance between the two connectors. It can be a threaded sleeve or a smooth rod sleeve structure, and is positioned by a locking nut or pin after adjustment. The connector rotating part 1-22 can adjust the connectors 1-11 and 1-12 to rotate axially so that the connection hole of the flange connector is aligned with the connection hole of the component interface. In this embodiment, the rotation and locking of the connector are achieved through a threaded sleeve and a locking nut. The connector assembly rotating part 1-23 is equipped with a set of pins connected to the connector assembly and can rotate around the pin axis to adjust the spatial rotation angle of the connector.

[0049] The welding positioning mechanism 2 consists of two parts: a conduit connector matching assembly 2-1 and a welding position adjustment assembly 2-2. The sealing and connection dimensions of the conduit connector matching assembly 2-1 are completely consistent with those of the engine conduit connector, and it matches and connects with the connectors 1-11 and 1-12 of the conduit connector assembly of the imprinting mechanism 1. The welding position adjustment assembly 2-2 includes a base 2-21, a welding connector rotating part 2-23, and a welding connector assembly rotating part 2-22. The base 2-21 is telescopic, which can meet the welding fixation requirements while adjusting the relative distance between the two connectors 2-11 and 2-12 of the conduit connector matching assembly 2-1. In this embodiment, the distance adjustment is achieved by connecting two adjusting plates to the base 2-21.

[0050] The rotating part 2-23 of the welding joint 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 holes of the joints 1-11 and 1-12. In this embodiment, the rotation and locking of the joints are achieved by a threaded sleeve and a locking nut. The rotating part 2-22 of the welding joint assembly is provided with a set of pins connected to the joints 2-11 and 2-12, and can rotate around the pin axis to adjust the spatial rotation angle of the joints 2-11 and 2-12. 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. During adjustment, the locking nut is loosened, the entire rotating part of the welding joint assembly is rotated to adjust the connection hole position of the welding joint, and then locked by the locking nut.

[0051] This invention discloses a method for improving the assembly accuracy of ducts in liquid rocket engines, comprising the following steps:

[0052] Step 1: Connect the connectors 1-11 and 1-12 of the conduit interface position imprinting mechanism 1 to the engine evaporator interface and the main pipeline interface respectively. By combining and adjusting the telescopic part 1-21, the connector rotating part 1-22 and the connector assembly rotating part 1-23, ensure that the connectors 1-11 and 1-12 are tightly fitted with the engine interface step sealing part, and the center of the flange connection hole is aligned.

[0053] Step 2: After the catheter interface position imprinting mechanism 1 is adjusted, the catheter interface position imprinting mechanism 1 is locked with three locking nuts to ensure that the relative positions of connectors 1-11 and 1-12 remain unchanged.

[0054] Step 3: Connect the connectors 1-11 and 1-12 of the conduit interface position imprinting mechanism 1 to the connectors 2-11 and 2-12 of the conduit connector matching assembly 2-1, respectively. By combining and adjusting the base 2-21, the connector rotating part 2-23 and the connector assembly rotating part 2-22, ensure that the connectors 2-11 and 2-12 are tightly fitted with the stepped sealing parts of the connectors 1-11 and 1-12 of the conduit interface position imprinting mechanism 1, and that the center of the flange connection hole is aligned.

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

[0056] Step 5: Connect the two end connectors 3-1 and 3-2 of the engine guide pipe to connectors 2-11 and 2-12 of the welding positioning mechanism 2 respectively, ensuring a tight fit at the stepped sealing area and alignment of the flange connection holes. (See attached...) Figure 4 .

[0057] Step 6: On the welding positioning mechanism 2, perform filing, tack welding, and welding of the intermediate straight pipe section 3-3 until the welding cools down. Then, remove the conduit 3 from the welding positioning mechanism 2 to ensure that the interface positions at both ends of the conduit do not deform or shift during the welding process. This ensures that the conduit is tightly connected to the interface of the two end components during assembly and improves the assembly accuracy of the engine conduit.

[0058] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

[0059] This invention solves the problem of poor assembly accuracy caused by welding deformation of liquid rocket engine ducts, realizes the spatial position replication and welding positioning of liquid rocket engine duct interfaces, ensures that the two ends of the duct are tightly connected with the component joints after the duct is produced, and improves the assembly accuracy and efficiency of the engine.

[0060] The parts of this invention not described in detail are common knowledge to those skilled in the art.

Claims

1. A device for improving the assembly accuracy of a liquid rocket engine duct, characterized by: The engine conduit interface position transfer mechanism and the conduit welding positioning mechanism, the installation position of the conduit on the engine is copied by the conduit interface position transfer mechanism and is transmitted to the conduit welding positioning mechanism, the conduit is installed by the conduit welding positioning mechanism, the grinding, positioning and welding production work of the conduit is completed, and the positioning reference in the grinding and welding process of the conduit is unified; The engine conduit interface position transfer mechanism comprises a conduit joint assembly and a spatial position adjusting assembly; The conduit joint assembly comprises two flange joints which are completely consistent with the sealing size and the connecting size of two joints of the conduit to be assembled The spatial position adjusting assembly comprises an extension part, a joint rotating part and a joint assembly rotating part; The two flange joints are respectively installed at two ends of the extension part through the joint assembly rotating part, the extension part is used for adjusting the length along the axial direction to adjust the distance between the flange joints, and the joint assembly rotating part is used for adjusting the spatial rotation angle of the flange joints; the joint rotating part is used for adjusting the rotation of the flange joints along the axial direction of the flange joints, so that the connecting hole of the flange joint is aligned with the connecting hole of the engine assembly interface; The welding positioning mechanism comprises two parts, namely a conduit joint matching assembly and a welding position adjusting assembly; The conduit joint matching assembly comprises two welding joints which are completely consistent with the sealing size and the connecting size of the assembly joint connected with the engine conduit, and the welding joints are matched and connected with the flange joints of the transfer mechanism; The welding position adjusting assembly comprises a base, a welding joint rotating part and a welding joint assembly rotating part; The base is used for adjusting the relative distance of welding in an extension mode; the welding joint rotating part adjusts the rotation of the welding joint along the axial direction of the welding joint, so that the connecting hole of the welding joint is aligned with the connecting hole of the flange joint of the conduit interface position transfer mechanism; The welding joint assembly rotating part is used for adjusting the spatial rotation angle of the welding joint.

2. The apparatus of claim 1, wherein: The extension part is a threaded sleeve shaft or a light rod sleeve shaft structure, and after adjustment, the extension part is positioned by a locking nut or a pin.

3. The apparatus of claim 1, wherein: The joint assembly rotating part adopts 1-2 sets of pin shafts or spherical hinges to adjust the spatial rotation angle of the flange joint.

4. The apparatus of claim 1, wherein: The welding joint assembly rotating part adopts 1-2 sets of pin shafts or spherical hinges to adjust the spatial rotation angle of the welding joint.

5. The apparatus of claim 1, wherein: The welding joint rotating part comprises a threaded sleeve shaft and a locking nut, a screw rod at the bottom of the welding joint assembly rotating part is screwed and connected with the threaded sleeve shaft of the welding joint rotating part, when adjustment is needed, the locking nut is loosened, the welding joint assembly rotating part is rotated as a whole to adjust the connecting hole of the welding joint, and after adjustment, the welding joint assembly rotating part is locked by the locking nut.

6. The apparatus of claim 1, wherein: The distance is adjusted by connecting two adjusting plates on the base, and the welding joint is installed on the adjusting plate.

7. A method for improving the assembly accuracy of liquid rocket engine ducts, implemented using the device according to claim 1, characterized in that The connecting joints of the conduit interface position transfer mechanism are respectively connected with the engine assembly interface, the extension part, the joint rotating part and the joint assembly rotating part are adjusted in combination, the joint step sealing part is tightly matched, and the center of the flange plate connecting hole is aligned; After the adjustment of the conduit interface position transfer mechanism is completed, the conduit interface position transfer mechanism is locked. ​ The connecting joint of the conduit interface position transfer mechanism is respectively matched with the welding joint of the conduit joint matching assembly, and the base, the welding joint rotating part and the welding joint assembly rotating part are combined and adjusted to ensure that the welding joint is tightly centered and attached to the joint step sealing part of the conduit interface position transfer mechanism; After the welding positioning mechanism is adjusted, it is locked; The engine conduit joint is connected with the welding joint of the welding positioning mechanism to ensure that the step sealing part is tightly centered and attached; The engine conduit joint is connected with the welding joint of the welding positioning mechanism to ensure that the step sealing part is tightly centered and attached; The engine conduit joint is connected with the welding joint of the welding positioning mechanism to ensure that the step sealing part is tightly centered and attached;

Images