Rapid leak detection device suitable for large and long vacuum pipeline

Abstract

The invention provides a rapid leak detection device suitable for a large and long vacuum pipeline, the device comprises a large and long pipeline base body, a plurality of longitudinal rails, an annular rail and an annular crawling mechanism, and dead-corner-free leak detection of the large and long pipeline with any section shape can be realized by changing the arrangement form of a sliding rail.

Description

Technical Field

[0001] The invention belongs to the technical field of non-standard machinery, and in particular relates to a rapid leak detection device suitable for long vacuum pipelines. Background Art

[0002] The vacuum tube high-speed train is a new transportation system that uses large-diameter vacuum tubes as carriers, uses superconducting magnetic levitation technology to achieve train separation from the ground, thereby eliminating friction resistance, and uses internal near-vacuum pipeline lines to greatly reduce air resistance, ultimately achieving a theoretical train speed of more than 1000km / h. The system uses special-shaped large-diameter low-vacuum split expansion joints to connect the main sections of long-line low-vacuum pipelines. The vacuum tube high-speed train can greatly shorten the time and space distance between cities. At the same time, it has many advantages such as being unaffected by weather conditions, unrestricted by air traffic control, and seamlessly connected to the urban rail system. At present, the world's major economic and technological powers have carried out relevant technical research and industrial development. A representative example is the American Hyperloop One company, which has been conducting research on vacuum tube trains since 2015 and has achieved a test speed of 387km / h. In order to ensure the vacuum sealing performance of low-vacuum pipelines and timely locate leaks after they occur, a rapid leak detection device suitable for long vacuum pipelines is urgently needed to overcome the faults caused by leaks.

[0003] At present, the representative patents on the related technologies of rapid leak detection devices mainly include the following aspects: Patent "A Petroleum Pipeline Leak Detection Device" (Patent No. CN208846097U) provides a petroleum pipeline leak detection device, which detects positive pressure petroleum pipelines and mainly focuses on generating an alarm to alert staff once a leak occurs in the petroleum pipeline, but the leak detection flexibility is low and it belongs to fixed-point monitoring. Patent "A LNG Vehicle Bottle Rapid Helium Leak Detection Device" (Patent No. CN212844217U) discloses a LNG vehicle bottle rapid helium leak detection device, which is easy to install and disassemble and has a simple structure, high leak detection efficiency and high accuracy, but is only suitable for leak detection in small volume spaces and has certain limitations in terms of the objects to be detected. The patent "A leak detection structure, leak detection device and leak detection method" (patent number CN113049192A) discloses a leak detection structure, leak detection device and leak detection method. The device has a simple principle and structure, high stability, and can be used to monitor the sealing of armored cable assemblies. However, the movement of the device is not flexible enough, and it is not suitable for leak point monitoring of large cross-sections. The patent "A rotary leak detection device" (patent number CN214121504U) discloses a rotary leak detection device, which can achieve 360-degree rotation without dead angle monitoring, but has no longitudinal translation movement and is limited to the leak detection space. At the same time, the device is affected by the cross-sectional size of the workpiece, which will also limit its function. Summary of the invention

[0004] The present invention aims to solve at least one of the problems existing in the prior art.

[0005] To this end, the present invention provides a rapid leak detection device suitable for long vacuum pipelines.

[0006] The technical solution of the present invention is to provide a rapid leak detection device suitable for long vacuum pipelines, the device comprising:

[0007] A long pipeline matrix, which includes a first straight segment, a first transition flexible connection segment, a second straight segment, a second transition flexible connection segment and a third straight segment connected in sequence along the axial direction of the long pipeline matrix;

[0008] A plurality of longitudinal tracks, the plurality of longitudinal tracks are evenly spaced on the long pipeline substrate along the circumferential direction of the long pipeline substrate, any of the longitudinal tracks has a track groove a along its length direction, and any of the longitudinal tracks includes a first straight track segment, a first curved transition segment, a second straight track segment, a second curved transition segment and a third straight track segment connected in sequence along its length direction, wherein the first, second and third straight track segments are respectively fixedly arranged on the first, second and third straight connection segments in sequence, and the first curved transition segment and the second curved transition segment are respectively arranged above the first transition flexible connection segment and the second transition flexible connection segment in sequence;

[0009] An annular track, the annular track comprises an annular track outer ring and a plurality of sliding connection components, the plurality of sliding connection components are matched with a plurality of longitudinal tracks one by one, both sides of the annular track outer ring are respectively provided with annular track grooves along its circumference, the sliding connection components comprise a fixed connection body, a sliding body, an elastic body and a sealing cover; the annular track outer ring is provided with a plurality of through holes evenly spaced along its circumference, which are arranged corresponding to a plurality of fixed connection bodies one by one, the end face of the fixed connection body is fixedly connected to the inner surface of the annular track outer ring, the fixed connection body is arranged coaxially with the corresponding through hole, one end of the sliding body is placed in the fixed connection body and is engaged with the fixed connection body, the other end of the sliding body is a sliding end, which is arranged toward the center of the annular track outer ring, and the sliding end is slidably arranged in the track groove a of the corresponding track; the elastic body is arranged in the through hole and the fixed connection body, and the outer opening of the through hole is sealed by the sealing cover;

[0010] The annular crawling mechanism includes a rotating outer ring and a plurality of rotating components, which are evenly spaced and circumferentially arranged along the circumference of the rotating outer ring. The annular crawling mechanism includes an audio-visual instrument, a rotating support frame and two supporting guide sliding units. The rotating support frame includes a first supporting part, a second supporting part and a third supporting part. The first supporting part is fixedly arranged on the inner surface of the rotating outer ring, and its length is greater than the width of the rotating outer ring. The second supporting part and the third supporting part are symmetrically arranged at both ends of the first supporting part and are respectively vertically connected to the first supporting part. The audio-visual instrument is arranged on the upper surface of the first supporting part. The two supporting guide sliding units are respectively fixedly connected to the inner ends of the second supporting part and the third supporting part. The two supporting guide sliding units are arranged opposite to each other. The two supporting guide sliding units are also slidably arranged in two annular track grooves, so that the annular crawling mechanism can slide along the circumference of the annular track outer ring.

[0011] Furthermore, the elastic body is a compression spring.

[0012] Furthermore, the end surface of the fixed connection body is welded to the inner surface of the outer ring of the annular track.

[0013] Furthermore, the external threaded joint supporting the sliding guide unit is screwed into the internal threaded hole of the corresponding support part to achieve a fixed connection.

[0014] Furthermore, the first transition flexible connecting section and the second transition flexible connecting section are bellows compensators made of metal material, and their cross-sectional shapes are consistent with the first straight segment, the second straight connecting section and the third straight connecting section.

[0015] Furthermore, the first transition flexible connection section is connected by welding or bolts to achieve a sealed connection with the connection sections on both sides; the second transition flexible connection section is connected by welding or bolts to achieve a sealed connection with the connection sections on both sides.

[0016] Furthermore, the longitudinal rail is made of carbon steel.

[0017] Furthermore, the annular track outer ring and the rotating outer ring are obtained by rolling carbon steel plate.

[0018] The above technical scheme cooperates with the design of a long pipeline base, multiple longitudinal tracks, annular tracks and annular crawling mechanisms, so that no-dead-angle leak detection of long pipelines with arbitrary cross-sectional shapes can be achieved by changing the layout of the sliding tracks; wherein, an audio-visual instrument is used for leak detection, and through the cooperation of the audio-visual instrument and the transmission mechanism, the shortcoming of the audio-visual instrument being limited by the distance from the target is overcome, and rapid leak point detection is achieved; the longitudinal movement can be manually controlled, and leak point detection of any pipeline section can be achieved at any time, and the circumferential movement can be driven by a motor to achieve circumferential leak point detection of the pipeline section; the leak detection device has a simple structure, and the components used are all commonly used components in the mechanical and vacuum fields. Compared with traditional leak detection methods, it has the characteristics of high reliability, low cost, easy installation and subsequent repair and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The included drawings are used to provide a further understanding of the embodiments of the present invention, which constitute a part of the specification, are used to illustrate the embodiments of the present invention, and together with the text description, explain the principles of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 A structural diagram of a long vacuum pipeline rapid leak detection device provided by an embodiment of the present invention;

[0021] Figure 2 An isometric view of a long pipeline substrate provided by an embodiment of the present invention;

[0022] Figure 3 A longitudinal track line diagram provided by an embodiment of the present invention;

[0023] Figure 4 A diagram of a ring track structure provided by an embodiment of the present invention;

[0024] Figure 5 This is a structural diagram of the annular crawling mechanism provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0027] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0028] like Figure 1-5As shown, in one embodiment of the present invention, a rapid leak detection device suitable for a long vacuum pipeline is provided, the device comprising a long pipeline substrate 10, a plurality of longitudinal tracks 20, an annular track 30 and an annular crawling mechanism 40, wherein along the axial direction of the long pipeline substrate 10, it sequentially comprises a first straight connecting section 101, a first transition flexible connecting section 102, a second straight connecting section 103, a second transition flexible connecting section 104 and a third straight connecting section 105 connected to each other; the plurality of longitudinal tracks 20 are arranged along the circumferential direction of the long pipeline substrate 10. The longitudinal rails 20 are evenly spaced on the long pipeline substrate 10, and any of the longitudinal rails 20 has a rail groove a along its length direction. Any of the longitudinal rails 20 includes a first straight rail segment, a first curved transition segment, a second straight rail segment, a second curved transition segment, and a third straight rail segment connected in sequence along its length direction, wherein the first, second, and third straight rail segments are fixedly arranged on the first, second, and third straight connecting segments in sequence, and the first curved transition segment and the second curved transition segment are respectively arranged on the first transition flexible connecting segment 1 in sequence. 02 and above the second transition flexible connection section 104; the annular track 30 includes an annular track outer ring 301 and a plurality of sliding connection components, the plurality of sliding connection components are matched with the plurality of longitudinal tracks 20 one by one, the two sides of the annular track outer ring 301 are respectively provided with annular track 30 grooves along its circumference, the sliding connection components include a fixed connection body 302, a sliding body 303, an elastic body 304 and a sealing cover 305; the annular track outer ring 301 is provided with a plurality of through holes evenly spaced along its circumference, which are arranged one by one with the plurality of fixed connection bodies 302, the fixed connection The end surface of the connecting body 302 is fixedly connected to the inner surface of the outer ring 301 of the annular track. The fixed connecting body 302 is coaxially arranged with the corresponding through hole. One end of the sliding body 303 is placed in the fixed connecting body 302 and is engaged with the fixed connecting body 302. The other end of the sliding body 303 is a sliding end, which is arranged toward the center of the outer ring of the annular track. The sliding end is slidably arranged in the track groove a of the corresponding track; the elastic body 304 is arranged in the through hole and the fixed connecting body 302, and the outer opening of the through hole is sealed by the sealing cover 305;The annular crawling mechanism 40 includes a rotating outer ring 401 and a plurality of rotating components, which are evenly spaced and circumferentially arranged along the circumference of the rotating outer ring 401, and includes an audio-visual instrument 402, a rotating support frame 403, and two supporting guide sliding units 404. The rotating support frame 403 includes a first supporting portion, a second supporting portion, and a third supporting portion. The first supporting portion is fixedly arranged on the inner surface of the rotating outer ring 401, and its length is greater than the width of the rotating outer ring 401. The second supporting portion and the third supporting portion are symmetrically arranged at both ends of the first supporting portion and are respectively vertically connected to the first supporting portion. The audio-visual instrument 402 is arranged on the upper surface of the first supporting portion. The two supporting guide sliding units 404 are respectively fixedly connected to the inner ends of the second supporting portion and the third supporting portion. The two supporting guide sliding units 404 are arranged oppositely, and the two supporting guide sliding units 404 are also slidably arranged in the grooves of the two annular tracks 30, so that the annular crawling mechanism 40 can slide circumferentially along the outer ring 301 of the annular track. ;

[0029] That is, the embodiment of the present invention carries out the construction work of the rapid leak detection device based on the premise that the construction of the long pipeline matrix 10 is completed. First, the longitudinal track 20 is welded to the surface of the long pipeline matrix 10, and then its position is fine-tuned to make it smooth in the longitudinal direction and evenly distributed in the circumferential direction. The function of the track is to ensure that the annular track 30 can run stably along the axis direction of the long pipeline, laying a good foundation for the ultimate realization of the dead-angle leakage point identification of the long pipeline. Secondly, the annular track outer ring 301, the fixed connecting body 302, the sliding body 303, the elastic body 304, and the sealing cover 305 in the annular track 30 are assembled and debugged in sequence, and then installed as a whole to the longitudinal track 20, and the three contact positions are fine-tuned so that it can slide smoothly on the surface of the longitudinal track 20. The function of the annular track 30 is to slide freely on the surface of the longitudinal track 20 to realize the dead-angle leakage point identification of the long pipeline. Finally, after the rotating outer ring 401, the audio-visual device 402, the rotating support frame 403, and the supporting guide sliding unit 404 in the annular crawling mechanism 40 are assembled, they are installed as a whole on the annular track 30. The main function of the annular crawling mechanism 40 is to slide along the end face track of the outer ring 301 of the annular track, so that the audio-visual device 402 can perform blind-angle leakage detection on the long pipeline substrate 10 in three directions of XYZ, thereby ensuring that the long pipeline has reliable low-vacuum sealing performance during long-term operation and ensuring the smooth progress of key tests.

[0030] Preferably, the elastic body 304 is a compression spring.

[0031] Preferably, the end surface of the fixed connection body 302 is welded to the inner surface of the annular track outer ring 301 .

[0032] According to one embodiment of the present invention, the external threaded joint supporting the sliding guide unit is screwed into the internal threaded hole of the corresponding support portion to achieve a fixed connection.

[0033] Preferably, the first transition flexible connecting section 102 and the second transition flexible connecting section 104 are bellows compensators made of metal, and their cross-sectional shapes are consistent with those of the first straight connecting section 101 , the second straight connecting section 103 and the third straight connecting section 105 .

[0034] According to an embodiment of the present invention, the first transition flexible connection section 102 is sealedly connected to the connection sections on both sides by welding or bolting; the second transition flexible connection section 104 is sealedly connected to the connection sections on both sides by welding or bolting.

[0035] According to an embodiment of the present invention, the longitudinal rail 20 is made of carbon steel.

[0036] According to an embodiment of the present invention, the annular track outer ring 301 and the rotating outer ring 401 are obtained by rolling carbon steel plates.

[0037] In the embodiment of the present invention, the audio-visual device 402 used is one of the most core components, and is a high-tech product in the current field. It can be directly ordered from a designated unit, and has the advantages of fast response and high precision. The longitudinal track 20 used is made of carbon steel and has a split structure, which is convenient for installation and precision control. The annular track outer ring 301 and the rotating outer ring 401 used can be directly obtained from a carbon steel plate roll, with low raw material cost and low processing cost, and mature technology. The remaining sliding bodies 303, compression springs, and support guide sliding units 404 are long-term supply products on the market, with high cost performance, reliability and interchangeability, and can be purchased directly.

[0038] It can be seen that the embodiment of the present invention carries out the construction of the rapid leak detection device based on the premise that the construction of the long pipeline base 10 is completed. First, the longitudinal track 20 is fixed to the surface of the long pipeline base 10 at the specified position, and then its position is fine-tuned to make it smooth in the longitudinal direction and evenly distributed in the circumferential direction, and finally fully welded. Secondly, the outer ring 301 of the ring track 30, the fixed connecting body 302, the sliding body 303, the compression spring, and the sealing cover 305 in the ring track 30 are assembled and debugged in sequence, and then installed as a whole to the longitudinal track 20, and the three contact positions are fine-tuned so that it can slide smoothly on the surface of the longitudinal track 20. Finally, the rotating outer ring 401, the audio-visual instrument 402, the rotating support frame 403, and the supporting guide sliding unit 404 in the ring crawling mechanism 40 are respectively installed on the ring track 30 in sequence. After the installation is completed, the guide sliding units at each contact position are fine-tuned so that the ring crawling mechanism 40 can rotate and slide smoothly on the surface of the ring track 30. The leak detection device can realize dead-angle leak detection of long pipelines with arbitrary cross-sectional shapes by changing the layout of the sliding track. The leak detection device has a simple structure and the parts used are all commonly used parts in the mechanical and vacuum fields. Compared with traditional leak detection methods, it has the characteristics of high reliability, low cost, easy installation and subsequent repair and maintenance.

[0039] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0040] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0041] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rapid leak detection device suitable for long vacuum pipelines, characterized in that: The device comprises: A long pipeline matrix, which includes a first straight segment, a first transition flexible connection segment, a second straight segment, a second transition flexible connection segment and a third straight segment connected in sequence along the axial direction of the long pipeline matrix; A plurality of longitudinal tracks, the plurality of longitudinal tracks are evenly spaced on the long pipeline substrate along the circumferential direction of the long pipeline substrate, any of the longitudinal tracks has a track groove a along its length direction, and any of the longitudinal tracks includes a first straight track segment, a first curved transition segment, a second straight track segment, a second curved transition segment and a third straight track segment connected in sequence along its length direction, wherein the first, second and third straight track segments are respectively fixedly arranged on the first, second and third straight connection segments in sequence, and the first curved transition segment and the second curved transition segment are respectively arranged above the first transition flexible connection segment and the second transition flexible connection segment in sequence; An annular track, the annular track comprises an annular track outer ring and a plurality of sliding connection components, the plurality of sliding connection components are matched with a plurality of longitudinal tracks one by one, both sides of the annular track outer ring are respectively provided with annular track grooves along its circumference, the sliding connection components comprise a fixed connection body, a sliding body, an elastic body and a sealing cover; the annular track outer ring is provided with a plurality of through holes evenly spaced along its circumference, which are arranged corresponding to a plurality of fixed connection bodies one by one, the end face of the fixed connection body is fixedly connected to the inner surface of the annular track outer ring, the fixed connection body is arranged coaxially with the corresponding through hole, one end of the sliding body is placed in the fixed connection body and is engaged with the fixed connection body, the other end of the sliding body is a sliding end, which is arranged toward the center of the annular track outer ring, and the sliding end is slidably arranged in the track groove a of the corresponding track; the elastic body is arranged in the through hole and the fixed connection body, and the outer opening of the through hole is sealed by the sealing cover; The annular crawling mechanism includes a rotating outer ring and a plurality of rotating components, which are evenly spaced and circumferentially arranged along the circumference of the rotating outer ring. The annular crawling mechanism includes an audio-visual instrument, a rotating support frame and two supporting guide sliding units. The rotating support frame includes a first supporting part, a second supporting part and a third supporting part. The first supporting part is fixedly arranged on the inner surface of the rotating outer ring, and its length is greater than the width of the rotating outer ring. The second supporting part and the third supporting part are symmetrically arranged at both ends of the first supporting part and are respectively vertically connected to the first supporting part. The audio-visual instrument is arranged on the upper surface of the first supporting part. The two supporting guide sliding units are respectively fixedly connected to the inner ends of the second supporting part and the third supporting part. The two supporting guide sliding units are arranged opposite to each other. The two supporting guide sliding units are also slidably arranged in two annular track grooves, so that the annular crawling mechanism can slide along the circumference of the annular track outer ring.

2. A rapid leak detection device suitable for long vacuum pipelines according to claim 1, characterized in that: The elastic body is a compression spring.

3. A rapid leak detection device suitable for long vacuum pipelines according to claim 1, characterized in that: The end surface of the fixed connection body is welded to the inner surface of the outer ring of the annular track.

4. A rapid leak detection device suitable for long vacuum pipelines according to any one of claims 1 to 3, characterized in that: The external thread joint supporting the sliding guide unit is screwed into the internal thread hole of the corresponding support part to achieve fixed connection.

5. A rapid leak detection device suitable for long vacuum pipelines according to any one of claims 1 to 4, characterized in that: The first transition flexible connection section and the second transition flexible connection section are bellows compensators made of metal, and their cross-sectional shapes are consistent with the first straight segment, the second straight connection section and the third straight connection section.

6. A rapid leak detection device suitable for long vacuum pipelines according to claim 5, characterized in that: The first transition flexible connection section is connected by welding or bolts to achieve a sealed connection with the connection sections on both sides; the second transition flexible connection section is connected by welding or bolts to achieve a sealed connection with the connection sections on both sides.

7. A rapid leak detection device suitable for long vacuum pipelines according to claim 1, characterized in that: The longitudinal rail is made of carbon steel.

8. A rapid leak detection device suitable for long vacuum pipelines according to claim 1, characterized in that: The annular track outer ring and the rotating outer ring are obtained by rolling carbon steel plates.

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