CN106734492A - A kind of marmem pipe joint hydraulic pressure expander with interior muscle - Google Patents

Abstract

The invention relates to a hydraulic expansion device for a shape memory alloy pipe joint with internal ribs, which includes a thick-walled pipe and a hydraulic expansion assembly, and the hydraulic expansion assembly includes a screw rod, a left (right) gasket, a left ( Right) O-ring, left (right) end cap, shape memory alloy fitting and nut. The strength and wall thickness of the thick-walled tube are large enough to ensure that no elastic-plastic deformation occurs during diameter expansion. There is a high-pressure liquid medium injection hole with a 90° rotation angle inside the screw rod. The left (right) end cap There is a boss on the top, which is used for the installation and positioning of the pipe joint before the expansion. In order to accurately control the expansion of the pipe joint, the installed and sealed hydraulic expansion assembly is placed in the thick-walled pipe, and the inner diameter of the thick-walled pipe is determined according to the expansion of the pipe joint. The invention has the advantages of protecting the inner ribs of the pipe joint from damage, uniform radial deformation of the pipe joint, simple expansion device, convenient installation before expansion and disassembly after expansion, and is suitable for expansion of various types of shape memory alloy pipe joints.

Description

A hydraulic expansion device for shape memory alloy pipe joints with internal ribs

technical field

The invention relates to a shape memory alloy pipe joint diameter expansion technology, in particular to a shape memory alloy pipe joint hydraulic diameter expansion device with internal ribs.

Background technique

The traditional connection method of aircraft hydraulic, pneumatic and fuel systems is mainly flare connection, which is the most extensive and mature connection form. However, this connection method is heavy in weight and complex in structure, especially when it is connected with important load-bearing structures, it has a great impact on the static strength and fatigue strength of the structure, the process is complicated, and the reliability and safety are relatively poor. At present, the world's advanced aircraft manufacturing countries have widely adopted the non-flare connection method of shape memory alloy pipe joints, and my country's aviation, aerospace, nuclear power and other fields have also begun to adopt the non-flare connection method of shape memory alloy pipe joints. This pipeline connection method with superior performance has the characteristics of not easy to leak, light weight, and small installation space. Using it to replace the widely used flared connection can significantly enhance the reliability and safety of aircraft systems. In the current actual production, the diameter expansion method of the shape memory alloy pipe joint with internal ribs usually adopts the rigid expansion rod to forcibly expand the diameter. This expansion method will cause serious damage to the internal ribs of the shape memory alloy pipe joint. The deformation is uneven, which will seriously affect the recovery force of the shape memory alloy pipe joint and the sealing performance of the pipeline connection. The patent "Expansion Device for Shape Memory Alloy Pipe Joints Based on Liquid Medium" (patent number: ZL201210073520.6) introduces a hydraulic expansion method, which is complicated, inconvenient to operate, and difficult to precisely control the expansion amount. Both ends are prone to damage due to line contact. The patent "a hydraulic bulging device for internal fluid replenishment and pressurized pipe" (patent number: ZL 200820104396.1) and the patent "a simple internal high-pressure forming method" (publication number: CN101332480A) are only for thin-walled parts with good plasticity The local bulging of the pipe cannot meet the overall and uniform diameter expansion requirements of the pipe joint. Therefore, it is necessary to design a hydraulic expander that can realize the overall expansion of the pipe joint with internal ribs, uniform expansion deformation, accurate and controllable expansion, easy installation and disassembly, and no damage to the internal ribs of the shape memory alloy pipe joint. diameter device.

Contents of the invention

The object of the present invention is to provide a hydraulic diameter expanding device for a shape memory alloy pipe joint with internal ribs. Using high-pressure liquid as the loading medium, based on the basic principle of hydraulic expansion, it has the characteristics of convenient installation and disassembly, uniform expansion deformation, precise and controllable expansion, and can protect the internal ribs of shape memory alloy pipe joints from damage.

In order to achieve the above object, the present invention is achieved in the following way: a hydraulic expansion device for a shape memory alloy pipe joint with internal ribs, comprising a thick-walled pipe and a hydraulic expansion assembly for a shape memory alloy pipe joint; The pipe joint hydraulic expansion assembly includes a screw, a left gasket, a right gasket, a left sealing ring, a right sealing ring, a left end cap, a right end cap, a shape memory alloy pipe joint and a nut; it is characterized in that: on the screw Install the left gasket, the left sealing ring, the left end cap, the shape memory alloy pipe joint, the right end cap, the right sealing ring, and the right gasket in sequence, and then use the nut to fasten the hydraulic expansion assembly of the shape memory alloy pipe joint; The shape memory alloy pipe joint is provided with internal ribs, and the high-pressure liquid medium injection port is set on the top of the screw, and the high-pressure liquid medium is injected into the shape memory alloy pipe joint with internal ribs through the high-pressure liquid medium injection port; the sealed shape of the installation The memory alloy pipe joint hydraulic expansion assembly is placed in the thick-walled pipe.

In order to expand the diameter of the shape memory alloy pipe joint with internal ribs, the above-mentioned screw is further set: a through hole with a 90° rotation angle is opened inside the screw for injecting the high-pressure liquid medium into the shape through the high-pressure liquid medium inlet. Inside the memory alloy pipe joint; a section of thread is processed on the outer wall of the screw rod, which is used to fasten and seal the hydraulic expansion diameter assembly through the nut. The high-pressure liquid medium is injected into the shape memory alloy pipe joint with internal ribs through the high-pressure liquid medium injection port, and the overall and uniform diameter expansion of the shape memory alloy pipe joint with internal ribs is realized by gradually increasing the pressure P of the liquid medium.

In order to realize the diameter expansion of the shape memory alloy pipe joint with inner rib, the above-mentioned left end cover and right end cover are further arranged: the left end cover and the right end cover are provided with bosses for shape memory alloy with inner rib Installation and positioning of pipe joints; the two ends of the shape memory alloy pipe joints with internal ribs are respectively placed on the bosses of the left end cover and the right end cover to achieve the purpose of axial center positioning.

In order to make the shape-memory alloy pipe joint with internal ribs expand to the expected amount of diameter expansion, the present invention further sets up the above-mentioned expansion scheme: the diameter expansion combination of the installed and sealed shape-memory alloy pipe joint with internal ribs The parts are placed in the thick-walled tube, which is made of high-strength steel, and its strength and wall thickness are large enough to ensure that the thick-walled tube does not produce elastic-plastic deformation when expanding its diameter. The inner diameter of the thick-walled pipe is determined according to the diameter expansion of the pipe joint, so as to realize the precise control of the diameter expansion.

The technical effects of the present invention are: the diameter expanding device is simple and compact, easy to install and disassemble, can realize the overall and uniform diameter expansion deformation of the shape memory alloy pipe joint with internal ribs, the diameter expansion amount is accurately and controllable, and the shape memory alloy pipe The inner rib of the joint has a protective effect.

Description of drawings

Fig. 1 is a structural schematic diagram of the device of the present invention.

Fig. 2 is a schematic cross-sectional view of the screw in Fig. 1 .

Fig. 3 is a schematic top view of the screw in Fig. 1 .

Fig. 4 is a schematic structural view of the shape memory alloy pipe joint with internal ribs in Fig. 1 .

In the figure, 1, thick-walled pipe 2, screw rod 3, left gasket 4, left sealing ring 5, left end cap 6, shape memory alloy pipe joint with inner rib 7, right end cap 8, right sealing ring 9, right gasket 10. High-pressure liquid medium injection port 11, nut 12, high-pressure liquid medium 13, thread.

detailed description

The specific implementation process of the present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figure 1, the present invention relates to a shape memory alloy pipe joint hydraulic expansion device with internal ribs, which includes a thick-walled pipe 1, a screw rod 2, a left gasket 3, a left sealing ring 4, a left end cover 5, a belt Inner rib shape memory alloy pipe joint 6, right end cap 7, right sealing ring 8, right gasket 9, high pressure liquid medium injection port 10, nut 11 and high pressure liquid medium 12.

As shown in Fig. 2, there is a high-pressure liquid medium injection through hole 10 at a 90° angle inside the screw 2, which is used to inject the high-pressure liquid medium into the shape memory alloy pipe joint through the high-pressure liquid medium inlet; the outer wall of the screw 2 is processed with a thread 13, Used to secure and seal hydraulic expander assemblies with nuts.

As shown in Figure 1 again, before the present invention expands the diameter of the shape memory alloy pipe joint with inner ribs, firstly install the left gasket 3, the left sealing ring 4, the left end cover 5, the shape memory alloy with inner ribs on the screw rod 2 successively. Alloy pipe joint 6, right end cap 7, right sealing ring 8, right gasket 9, and then use nut 11 to fasten the hydraulic expansion diameter assembly. Wherein, the two ends of the shape memory alloy pipe joint 6 with inner ribs should be placed on the bosses of the left end cover 5 and the right end cover 7 respectively, so as to realize the axial center positioning of the shape memory alloy pipe joint 6 with inner ribs. Finally, the assembly of the sealed shape memory alloy pipe joint 6 is placed in the thick-walled pipe 1, and the high-pressure liquid medium 12 is injected into the shape memory alloy pipe joint 6 through the high-pressure liquid medium inlet 10. The pressure P is used to realize the overall and uniform outward diameter expansion of the shape memory alloy pipe joint 6 with internal ribs. When the outer wall of the shape memory alloy pipe joint 6 increases and contacts the inner wall of the thick-walled pipe 1 , the diameter expansion of the shape memory alloy pipe joint 6 ends.

After the diameter expansion is completed, remove the high-pressure medium 12, take out the assembly of the shape memory alloy pipe joint 6, disassemble the nut 11, the right gasket 9, the right sealing ring 8, and the right end cover 7 in the reverse order of installing the assembly, and then use Take out the shape memory alloy pipe joint 6 with inner ribs, and thus complete the diameter expansion process of the shape memory alloy pipe joint 6 with inner ribs.

Claims (4)

1. A shape-memory alloy pipe joint hydraulic expansion device with internal ribs, which includes a thick-walled pipe and a shape-memory alloy pipe joint hydraulic expansion assembly; the shape-memory alloy pipe joint hydraulic expansion assembly includes a screw rod, Left gasket, right gasket, left sealing ring, right sealing ring, left end cap, right end cap, shape memory alloy pipe joint and nut; it is characterized in that: the left gasket, left sealing ring, The left end cap, the shape memory alloy pipe joint, the right end cap, the right sealing ring, the right gasket, and then use the nut to fasten the hydraulic expansion assembly of the shape memory alloy pipe joint; the shape memory alloy pipe joint is provided with inner ribs The high-pressure liquid medium injection port is set on the top of the screw, and the high-pressure liquid medium is injected into the shape memory alloy pipe joint with inner ribs through the high-pressure liquid medium injection port; the hydraulic expansion assembly of the installed and sealed shape memory alloy pipe joint is placed in thick-walled tubes. 2 . The hydraulic expansion device for shape memory alloy pipe joints with internal ribs according to claim 1 , wherein a through hole with a 90° rotation angle is opened inside the screw rod, and a thread is processed on the outer wall of the screw rod. 3 . 3. A hydraulic expansion device for shape memory alloy pipe joints with inner ribs according to claim 1, characterized in that: bosses are provided on the left end cap and the right end cap, and the shape memory alloy pipe with inner ribs The two ends of the joint are respectively placed on the bosses of the left end cover and the right end cover. 4. A hydraulic expansion device for shape memory alloy pipe joints with inner ribs according to claim 1, characterized in that: the thick-walled pipe is made of high-strength steel, and the inner diameter of the thick-walled pipe depends on the expansion of the pipe joint. Determined by diameter.