CN105067251A - Low-temperature failure detector for titanium-nickel-iron memory alloy joint - Google Patents

Abstract

The invention discloses a low-temperature failure detection device for a titanium-nickel-iron memory alloy joint, which relates to the technical field of aviation detection. Low-temperature failure detection device for titanium-nickel-iron memory alloy joints, including pipelines, outer sleeves and plugs. Among them, the tested memory alloy joint is sleeved on the outer circle of the pipeline; the center of the outer sleeve is provided with a through hole of the outer sleeve, and the sleeve and the memory alloy joint are installed in the outer sleeve through hole of the outer sleeve, and on the wall of the outer sleeve. An observation hole is provided, and the observation hole is connected to the outside of the outer casing and a through hole of the outer casing is provided in the center; two plugs are provided, which are respectively connected with the pipeline and the two ends of the outer casing. The advantage of the present invention is that the low-temperature failure detection device for titanium-nickel-iron-iron memory alloy joints has a simple manufacturing process, some parts are finished products to be tested, and whether the parts fail or not can be consistent with the product, and the detection device does not use other chemical raw materials , no pollution to the liquid nitrogen storage environment, simple and convenient to use, you can intuitively see whether the product is invalid.

Description

A low-temperature failure detection device for titanium-nickel-iron memory alloy joints

technical field

The invention relates to the technical field of aviation detection, in particular to a low-temperature failure detection device for a titanium-nickel-iron memory alloy joint.

Background technique

Titanium-nickel-iron memory alloy is a new type of functional material developed in the early 1960s, and has been widely used in aviation, aerospace, medical and other fields. Titanium-nickel-iron memory alloy pipe joints are one of the most widely used and mature products of memory alloys on aircraft. They have the advantages of high reliability, low leakage, simple structure, convenient installation, and saving assembly space. They were first introduced in the late 1960s. U.S. Navy F-14 fighter jet hydraulic system titanium alloy pipeline is used as a permanent joint, and it is extended to military aircraft battlefield maintenance and civil aircraft. It can connect titanium alloy, stainless steel and aluminum alloy conduits, and is suitable for working pressures of 21MPa, 28MPa, and 35MPa. Aircraft hydraulic piping system.

The assembly clearance of the memory alloy pipe joint is the difference between the smallest inner diameter after diameter expansion and the outer diameter of the connected pipe. From the perspective of connection strength, it is desirable to have a large amount of interference, and from the perspective of assembly, it is desirable to have a large assembly clearance. The principle of determining the assembly clearance is to give priority to ensuring the connection strength. On the premise of meeting the assembly requirements, the assembly clearance should be as small as possible.

The storage of titanium-nickel-iron memory alloy pipe joint products must be kept below its austenite transformation temperature. At present, liquid nitrogen tanks are used for storage, but due to the gasification of liquid nitrogen, the amount of liquid nitrogen will decrease over time. , may cause the Ni-Ni-Memory alloy joints stored in it to spring back due to the temperature being higher than the austenite transformation temperature, and the inner diameter is reduced so that it cannot be installed, so that the Ti-Ni-Ni-Iron memory alloy pipe joints become invalid. But there is currently no good way to verify that a stored joint has expired.

Contents of the invention

The object of the present invention is to provide a low-temperature failure detection device for titanium-nickel-iron memory alloy joints to solve the problem of inconvenient detection of joint failures.

The technical solution of the present invention is: a low-temperature failure detection device for a titanium-nickel-iron memory alloy joint, which is used to detect whether the memory alloy joint fails, including a pipeline, an outer sleeve and a plug. in,

The shape of the pipeline is cylindrical, and the memory alloy joint is sleeved on the outer circle of the pipeline;

The center of the outer casing is provided with an outer casing through hole, and the pipeline and the memory alloy joint are installed in the outer casing through hole of the outer casing. An observation hole is arranged on the wall of the outer casing, and the observation hole is connected to the outer casing. The outside of the pipe and the outer casing through hole set in the center, the observation hole is used to observe whether the memory alloy joint moves on the pipe;

The plug is provided with two pieces, which are respectively connected with the two ends of the pipeline and the outer casing, and the plug is used to support the pipeline and the outer casing.

Preferably, the center of the pipeline is set as a cylindrical through hole, which can reduce the weight of the pipeline.

Preferably, at least one observation hole is provided. Through the observation hole provided on the outer sleeve, it can be observed whether the memory alloy joint moves in the axial direction of the pipeline. If the memory alloy joint moves in the axial direction of the pipeline, it indicates that the memory alloy joint The alloy joint has not failed. If the memory alloy joint cannot move in the axial direction of the pipeline through the observation hole, it means that the inner hole of the memory alloy joint has been shrunk and fixed on the pipeline, and it can be judged that the memory alloy joint has failed. .

Preferably, the outer sleeve is cylindrical in shape, and the through hole of the outer sleeve is a cylindrical through hole.

Preferably, the plug is an annular flange structure, and a plug through hole is provided along the direction of the central axis, and the plug through hole can reduce the weight of the plug.

Preferably, an annular groove is provided on the plug, and the annular groove is used for installing an outer sleeve.

Preferably, the pipeline is finished titanium alloy pipe used in conjunction with the memory alloy joint. The finished titanium alloy pipe is a part matched with the memory alloy joint when it is used, so it can be more directly judged whether the memory alloy joint has failed by using the finished titanium alloy pipe.

Preferably, the outer sleeve and the plug are made of PVC plastic. The material used can reduce the weight of the part itself and is easy to process. The PVC material itself is soft and will not cause damage to memory alloy joints and pipelines.

Preferably, the observation hole is set as a cylindrical through hole, the diameter of the cylindrical hole is smaller than the length of the memory alloy joint, and the distance between the center of the observation hole and the far end of the outer sleeve is greater than the length of the memory alloy joint.

Preferably, the observation hole is set as a long hole, the length direction of the long hole is the axial direction of the outer sleeve, and the length of the long hole is longer than the length of the memory alloy joint.

The detection device is assembled in liquid nitrogen. When the joint does not fail due to the high temperature of the liquid nitrogen tank, shake the detection device left and right, and you can see the titanium-nickel-iron memory alloy joint in the observation hole. When the joint fails due to the high temperature of the liquid nitrogen tank, the nickel-iron memory alloy joint has formed an interference connection with the pipeline, and the position cannot be changed. It is fixed at a certain position, and the detection device cannot be observed by shaking it left and right. The holes see the Inconel joints.

The advantage of the present invention is that the low-temperature failure detection device for titanium-nickel-iron memory alloy joints has a simple manufacturing process, some parts are finished products to be tested, and whether the parts fail or not can be kept consistent with the product, and the detection device does not use other chemical raw materials , no pollution to the liquid nitrogen storage environment, simple and convenient to use, you can intuitively see whether the product is invalid.

Description of drawings

Fig. 1 is a schematic structural view of a low-temperature failure detection device for a TiNi-Metal joint according to the first embodiment of the present invention;

Fig. 2 is a schematic structural view of a low-temperature failure detection device for a TiNi-Metal joint according to a second embodiment of the present invention.

Among them: 1—memory alloy joint, 2—pipeline, 3—outer casing, 31—observation hole, 4—plug.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below in conjunction with the drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of the invention. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention. Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

In describing the present invention, it is to be understood that the terms "central", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", The orientations or positional relationships indicated by "top", "bottom", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the Means that a device or element must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the scope of the invention.

Example 1:

As shown in FIG. 1 , a low-temperature failure detection device for a titanium-nickel-iron memory alloy joint is used to detect whether a memory alloy joint 1 fails, including a pipeline 2 , an outer sleeve 3 and a plug 4 .

The pipeline 2 adopts the finished titanium alloy pipe used in conjunction with the memory alloy joint 1 . The finished titanium alloy pipe is a part that cooperates with the memory alloy joint 1 during use, so using the finished titanium alloy pipe can more directly determine whether the memory alloy joint 1 has failed.

It can be understood that the pipeline 2 can also be set according to actual conditions. For example, in an alternative implementation, the pipeline 2 is a round tube processed according to the finished titanium alloy pipe used in conjunction with the memory alloy joint 1, and its interior is set as a through hole, and the through hole is used to connect with the plug 4; In another alternative embodiment, the outer diameter of the pipeline 2 is processed according to the size of the finished titanium alloy pipe used in conjunction with the memory alloy joint 1, the pipeline 2 is a solid cylinder, and blind holes are provided at both ends, so The blind hole is used to connect with the plug 4.

The outer casing 3 is configured as cylindrical in shape, and the through hole of the outer casing is configured as a cylindrical through hole. The sleeve 2 and the memory alloy joint 1 are installed in the through hole of the outer sleeve 3 . Both ends of the outer casing 3 are connected with a plug 4 .

It can be understood that the shape of the outer sleeve 3 can also be set according to actual conditions. For example, in an alternative embodiment, the shape of the outer sleeve 3 is set as a square, and the through hole of the outer sleeve is set as a cylindrical through hole. The two ends of the outer sleeve 3 and the matching plug 4 are also set as a square flange at one end and a cylinder at the other end.

Four observation holes 31 are arranged on the outer casing 3 . The observation hole 31 is set as a cylindrical through hole, and the diameter of the cylindrical through hole is smaller than the length of the memory alloy joint 1, the observation hole 31 is symmetrically arranged in the axial direction of the outer casing 3, and the center position of the observation hole 31 is in the same direction as the outer casing. The distance at the far end of the tube 3 is greater than the length of the memory alloy joint 1 . The observation holes 31 are arranged symmetrically at intervals of 180° in the circumferential direction of the outer casing 3 .

It can be understood that there may be one or more viewing holes 31 as required, and at least one is provided.

Through the observation hole 31 provided on the outer casing 3, it can be observed whether the memory alloy joint 1 moves in the axial direction of the pipeline 2. If the memory alloy joint 1 moves in the axial direction of the pipeline 2, it means that the memory alloy joint 1 has not failed , if the memory alloy joint 1 cannot be seen to move in the axial direction of the pipeline 2 through the observation hole 31, it means that the inner hole of the memory alloy joint 1 has shrunk and is fixed on the pipeline 2, and it can be judged that the memory alloy joint 1 has failed.

The plug 4 is an annular flange structure, and a plug through hole is arranged along the central axis. The plug through hole can reduce the weight of the plug 4. There are two plugs 4 for each set of detection device, which are respectively arranged at the two ends of the pipeline 2 and the outer casing 3 . The plug 4 supports the pipeline 2 and the outer sleeve 3 . One end of the plug 4 is set as a cylindrical section, and the other end is set as an annular flange. The outer diameter of the cylindrical section matches the inner hole of the pipeline 2. The annular flange of the plug 4 is on the end surface of the cylindrical section of the plug 4. An annular groove is provided, and the two ends of the outer sleeve 3 are stuck in the annular groove.

The outer casing 3 and the plug 4 are made of PVC plastic. The material used can reduce the weight of the part itself and is easy to process. The PVC material itself is relatively soft and will not cause damage to the memory alloy joint 1 and the pipeline 2 . The plug 4 can be integrally formed by casting, or can be formed by machining.

Example 2:

As shown in FIG. 2 , Embodiment 2 is basically the same as Embodiment 1 above, except that the plug 4 is configured as a double-step flange structure, which is more convenient to process. The plug 4 is provided with a central through hole, the first step near the through hole is used for installing the pipeline 2 , and the second step near the outer circle is used for installing the outer sleeve 3 .

Example 3:

Embodiment 3 is basically the same as above-mentioned Embodiment 1, and the difference is that: the observation hole 31 is set as a long hole, the length direction of the long hole is the axial direction of the outer casing 3, and the length of the long hole is greater than that of the memory alloy Length of joint 1.

Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: they can still modify the technical solutions described in the aforementioned embodiments, or perform equivalent replacements for some of the technical features; and these The modification or replacement does not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (10)

1. A low-temperature failure detection device for a titanium-nickel-iron memory alloy joint is used for detecting whether a memory alloy joint (1) fails or not, and is characterized in that: comprises a pipeline (2), an outer sleeve (3) and a plug (4), wherein,

the pipeline (2) is cylindrical in shape, and the memory alloy connector (1) is sleeved on the outer circle of the pipeline (2);

an outer sleeve through hole is formed in the center of the outer sleeve (3), the pipeline (2) and the memory alloy connector (1) are installed in the outer sleeve through hole of the outer sleeve (3), an observation hole (31) is formed in the pipe wall of the outer sleeve (3), the observation hole (31) is communicated with the outer part of the outer sleeve (3) and the outer sleeve through hole formed in the center of the outer sleeve, and the observation hole (31) is used for observing whether the memory alloy connector (1) moves on the pipeline (2);

the plug (4) is provided with two pieces which are respectively connected with the two ends of the pipeline (2) and the outer sleeve (3), and the plug (4) is used for supporting the pipeline (2) and the outer sleeve (3).

2. The device for detecting the low-temperature failure of the titanium-nickel-iron memory alloy joint according to claim 1, wherein: the center of the pipeline (2) is provided with a cylindrical through hole.

3. The device for detecting the low-temperature failure of the titanium-nickel-iron memory alloy joint according to claim 1, wherein: at least one observation hole (31) is arranged.

4. The device for detecting the low-temperature failure of the titanium-nickel-iron memory alloy joint according to claim 1, wherein: the outer sleeve (3) is cylindrical, and the outer sleeve through hole is a cylindrical through hole.

5. The device for detecting the low-temperature failure of the titanium-nickel-iron memory alloy joint according to claim 1, wherein: the plug (4) is of an annular flange structure, and a plug through hole is formed in the central axis direction.

6. The device for detecting the low-temperature failure of the titanium-nickel-iron memory alloy joint according to claim 1, wherein: and the plug (4) is provided with an annular groove, and the annular groove is used for installing the outer sleeve (3).

7. The device for detecting the low-temperature failure of the titanium-nickel-iron memory alloy joint according to claim 1, wherein: the pipeline (2) adopts a finished titanium alloy pipe matched with the memory alloy joint (1).

8. The device for detecting the low-temperature failure of the titanium-nickel-iron memory alloy joint according to claim 1, wherein: the outer sleeve (3) and the plug (4) are made of PVC plastic.

9. The device for detecting the low-temperature failure of the titanium-nickel-iron memory alloy joint according to claim 1, wherein: the observation hole (31) is a cylindrical through hole, the diameter of the cylindrical hole is smaller than the length of the memory alloy joint (1), and the distance between the center of the observation hole (31) and the far end of the outer sleeve (3) is larger than the length of the memory alloy joint (1).

10. The device for detecting the low-temperature failure of the titanium-nickel-iron memory alloy joint according to claim 1, wherein: the observation hole (31) is a long hole, the length direction of the long hole is the axial direction of the outer sleeve (3), and the length of the long hole is larger than that of the memory alloy joint (1).