Tool for improving test performance of metal corrugated pipe

Abstract

The invention relates to the technical field of experiment tools, in particular to a tool for improving the test performance of a metal corrugated pipe, which comprises a corrugated pipe body, a connector is arranged at the end part of the corrugated pipe body, and a switching device for connecting a simulation pipeline sleeves the outer side of the connector. One end of the switching device is provided with a fixing pipe used for being connected with a connector in a clamping mode, a sealing device is arranged in the fixing pipe, the other end of the fixing pipe is provided with a plug used for being connected with a simulation pipeline, and the phenomenon that the corrugated pipe body is loosened in the testing process is avoided. The qualified rate of sealing performance detection of the corrugated pipe body in complex test states such as negative pressure and vibration is improved, the production efficiency of products is improved, and the production cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of experimental tooling, and in particular to a tooling for improving the test performance of a metal bellows. Background Art

[0002] Low-pressure armored metal bellows are used in the piping system of on-orbit aerospace equipment. The working conditions are relatively strict. The hose is required to have good sealing performance. The sealing requirement is that the helium mass spectrometer leakage rate is not greater than 1×10-8Pa.m3 / S. The hose is even required to be able to transport working media under vacuum and negative pressure conditions. In order to reduce the production cost of the product, it is generally required to test the sealing performance of the hose after the wire mesh sleeve is woven and the welds between the welding adapter, wire mesh sleeve and welding ring are completed, so as to screen out unqualified products in time and reduce the unqualified rate of finished products.

[0003] However, the hose ends are not welded with external joints (such as Figure 3 As shown), this brings certain difficulties to the sealing test, especially for the negative pressure sealing performance test and helium mass spectrometry leak rate test. At present, there are two main measures for sealing test: the first is to consider leaving a straight pipe section at the welding end when designing the welding adapter structure, weld the standard external joint for sealing test, and cut off the standard joints at both ends according to the size required by the drawing after the test. However, its disadvantages are obvious. It not only increases the production cost, but also may cause the metal chips generated during the cutting process to enter the inside of the hose and adhere to the trough position and cannot be completely removed. The second is to design a U-shaped flange clamping structure test fixture, assemble it to the end of the welding ring and cooperate with the sealing structure fixture for sealing test. This structure can meet the conventional positive pressure, positive pressure helium mass spectrometry leak rate detection and other sealing tests. If it is under special conditions such as negative pressure, negative pressure helium mass spectrometry leak rate detection and vibration test, it may cause the test fixture to loosen, resulting in unqualified hose sealing performance; in this way, it is impossible to truly detect whether the hose sealing performance meets the requirements, which increases the unqualified rate of the product. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art that the steps for testing the sealing performance of low-pressure metal armor after production are relatively complicated and prone to errors, and to provide a tooling for improving the test performance of metal bellows.

[0005] In order to achieve the above-mentioned purpose, the embodiment of the present invention specifically adopts the following technical scheme: a tool for improving the test performance of a metal bellows, comprising a bellows body, a connecting head is provided at the end of the bellows body, a switching device for connecting a simulated pipeline is sleeved on the outer side of the connecting head, the switching device comprises a fixed tube for clamping the connecting head, a sealing device is provided inside the fixed tube, and a plug for connecting a simulated pipeline is provided at the other end of the fixed tube.

[0006] Furthermore, the connector includes a sleeve arranged outside the corrugated pipe body.

[0007] Furthermore, one end of the fixing pipe is provided with a locking bolt for fixing the bellows body, and four locking bolts are provided. The locking bolts penetrate the side wall of the fixing pipe and abut against the bellows body.

[0008] Furthermore, the bottom of the pipe sleeve abuts against the side wall of the locking bolt.

[0009] Furthermore, a plug for connecting to a fixed pipe is provided at the bottom of the plug, and the inner diameter of the plug is matched with the outer diameter of the connector.

[0010] Furthermore, the sealing device comprises a sealing ring arranged on the inner wall of the cannula.

[0011] The beneficial effects of the embodiments of the present invention are as follows: the locking bolt acts on the bottom of the pipe sleeve, and when the inside of the bellows body is subjected to pressure or vibration during the test, the arrangement of the pipe sleeve and the locking bolt can further enhance the connection strength between the connector and the bellows body, preventing the bellows body from falling off from the inside of the fixed tube, while ensuring the sealing, ensuring that the connector is firmly fixed in the fixed tube, facilitating tests under various working conditions, and improving applicability. The guide block is plugged into the inside of the insert tube, and the sealing ring is squeezed between the inner wall of the insert tube and the outer wall of the guide block, thereby forming a tight sealing structure. The arrangement of the plug and the fixed tube improves the qualified rate of the sealing detection of the bellows body under complex test conditions such as negative pressure and vibration, improves product production efficiency, reduces production costs, and can greatly improve the testing efficiency and product quality of metal bellows. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0013] Figure 2 It is a cross-sectional structural schematic diagram of the present invention;

[0014] Figure 3 It is a schematic diagram of the overall structure of the bellows body of the present invention;

[0015] In the figure: 1, bellows body; 101, pipe sleeve; 102, guide block; 2, fixing pipe; 201, locking bolt; 3, plug; 301, insert pipe. DETAILED DESCRIPTION

[0016] Preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0017] See also Figures 1 to 3 The embodiment of the present invention discloses a tool for improving the test performance of a metal bellows, which mainly includes components such as a bellows body 1, a connector, an adapter, a fixing pipe 2, a sealing device and a plug 3. The bellows body 1 is used as the main part to be tested. Connectors are provided at both ends of the bellows body 1 for connecting to a system for use. The connector includes a metal sleeve directly welded to the end of the bellows body 1, and its function is to provide a stable connection interface so that it can be connected to a simulated pipeline for testing through the adapter.

[0018] The adapter device includes a fixed tube 2, which is used to clamp and fix the connecting head. A sealing device is arranged inside the fixed tube 2 to ensure the sealing between the bellows body 1 and the adapter device during the test. The inner wall of the fixed tube 2 abuts against the pipe sleeve 101 of the connecting head. The pipe sleeve 101 is welded to the outside of the bellows body 1 to ensure the stability of the entire connecting head. It is the part with the largest outer diameter. The fixed tube 2 wraps the entire connecting head. A locking bolt 201 is arranged on the side wall of the fixed tube 2 to enhance the stability and sealing of the bellows body 1 and the fixed tube 2 during connection. The locking bolt 201 passes through the side wall of the fixed tube 2 and abuts against the bellows body 1 or the connecting head. By tightening the locking bolt 201, it can be ensured that the connecting head is firmly fixed in the fixed tube 2, and at the same time, the effective sealing of the sealing device is ensured. In order to further improve the stability and sealing of the tooling, the connecting head is designed to include a sleeve 101 arranged on the outside of the bellows body 1. The sleeve 101 is a metal sleeve made of the same material as the bellows body 1. The locking bolt 201 preferably acts on the bottom of the sleeve 101. When the inside of the bellows body 1 is subjected to pressure or vibration during the test, the setting of the sleeve 101 and the locking bolt 201 can further enhance the connection strength between the connecting head and the bellows body 1, prevent the bellows body 1 from falling off from the fixed pipe 2, and ensure the sealing at the same time, ensure that the connecting head is firmly fixed in the fixed pipe 2, facilitate testing under various working conditions, and improve applicability.

[0019] The other end of the fixed tube 2 is connected to the plug 3, and the plug 3 is used to connect with the simulation pipeline for various performance tests. A cannula 301 is set at the bottom of the plug 3, and the inner diameter of the cannula 301 is adapted to the outer diameter of the connector (or the sleeve 101). When the plug 3 is connected to the fixed tube 2, the cannula 301 can be tightly sleeved on the connector (or the sleeve 101), further improving the sealing performance of the tooling. In this embodiment, a guide block 102 is set at the end of the connector, and the guide block 102 is plugged into the inside of the cannula 301. The sealing device includes a sealing ring set on the inner wall of the cannula 301. The sealing ring can be a rubber ring, a plastic ring or a ring body made of other materials with good elasticity and sealing performance. When the plug 3 is connected to the fixed tube 2, the guide block 102 is plugged into the inside of the cannula 301, and the sealing ring will be squeezed into the cannula 301. A tight sealing structure is formed between the inner wall and the outer wall of the guide block 102, ensuring the sealing between the bellows body 1 and the adapter during the test, and realizing the sealing performance detection of the metal bellows under special conditions. The end of the guide block 102 is set to a spherical cone structure, which plays a positioning and guiding role during assembly, and can prevent the sealing ring from contacting the sharp edge end face of the welding adapter during the assembly process to cause extrusion deformation, scratches, etc., and play a certain protective role on the sealing ring, avoiding the loosening of the bellows body 1 during the test. The setting of the plug 3 and the fixing tube 2 improves the qualified rate of the sealing detection of the bellows body 1 under complex test conditions such as negative pressure and vibration, improves the product production efficiency, reduces the production cost, and can greatly improve the testing efficiency and product quality of the metal bellows.

[0020] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0021] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] The term "comprise" or any other similar term is intended to cover a non-exclusive inclusion, such that a process, article, or apparatus / device that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, article, or apparatus / device.

[0023] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A tool for improving the test performance of a metal bellows, comprising a bellows body (1), wherein the end of the bellows body (1) is provided with a connector, and characterized in that: The outer side of the connector is sleeved with a switching device for connecting to a simulated pipeline, the switching device comprises a fixed tube (2) for clamping the connector, a sealing device is arranged inside the fixed tube (2), and the other end of the fixed tube (2) is provided with a plug (3) for connecting to a simulated pipeline.

2. The tooling for improving the test performance of metal bellows according to claim 1, characterized in that: The connector comprises a pipe sleeve (101) arranged outside the corrugated pipe body (1).

3. The tooling for improving the test performance of metal bellows according to claim 2, characterized in that: One end of the fixing tube (2) is provided with a locking bolt (201) for fixing the bellows body (1), and four locking bolts (201) are provided. The locking bolts (201) penetrate the side wall of the fixing tube (2) and abut against the bellows body (1).

4. The tooling for improving the test performance of metal bellows according to claim 3 is characterized in that: The bottom of the pipe sleeve (101) abuts against the side wall of the locking bolt (201).

5. The tooling for improving the test performance of metal bellows according to claim 1, characterized in that: The bottom of the plug (3) is provided with a plug tube (301) for connecting to the fixed tube (2), and the inner diameter of the plug tube (301) is matched with the outer diameter of the connector.

6. The tooling for improving the test performance of metal bellows according to claim 5, characterized in that: The sealing device comprises a sealing ring arranged on the inner wall of the insertion tube (301).

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