Pipeline air tightness detection device

Abstract

The utility model discloses a pipeline air tightness detection device, which relates to the technical field of pipeline detection and comprises a detection support, a cylinder body, a plunger, a pressing block, a sealing sleeve, a piston rod and a piston, a shell, an end cover, an induction coil and a catalyst layer are arranged outside the pipeline air tightness detection device, and a high-pressure medium is filled into the detection support through external supercharging equipment to push the plunger and the pressing block in the cylinder body to move. When the pressure reaches a preset value, the pressure regulating valve is switched on, a medium flows into the position between the piston and the sealing sleeve, the piston is driven to exhaust air in the pipeline, meanwhile, the induction coil is heated by high-frequency current, the temperature of the catalyst layer is increased, the leaked medium is subjected to catalytic combustion, and resistance change is caused; therefore, rapid and accurate detection of the air tightness of the pipeline is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipeline detection technical field, concretely is pipeline gas tightness detection device. BACKGROUND

[0002] Pipeline gas tightness detection is of great significance to guarantee the safe and stable operation of pipeline system, through timely detection of whether there is a small leakage in the pipeline, potential safety accidents and environmental pollution can be prevented, and the stability of medium (such as gas or liquid) in the conveying process is ensured, in addition, the detection result can provide basis for pipeline maintenance and repair, thereby prolonging the service life of the pipeline, improving the overall operation efficiency of the system, and reducing energy loss and economic risk.

[0003] The device disclosed by Chinese invention patent CN112067212B forms a sealed cavity in the pipeline installation cavity by setting the carrier, the expansion piece, the gas source assembly and the detection assembly, and makes the pipeline contact with the positioning groove in the carrier by means of the expansion piece, so as to inject gas and detect the air pressure of the sealed cavity, which has simple structure, small space occupation, can quickly complete detection and improve work efficiency, but the detection cavity area is limited, the sealing effect is easily affected by the flatness of the pipeline surface and the installation error, resulting in the deficiency in the detection range and sensitivity.

[0004] Chinese utility model patent CN220230865U discloses a detection device composed of double sealing covers and a detection ring, adopts sealing ring and outer cover structure to install the sealing cover at both ends of the pipeline, forms a detection cavity through the detection ring, is provided with a pressure gauge and a gas pump at the same time, realizes self-detection function and improves the detection accuracy, but due to its complex structure and cumbersome installation steps, it has high requirements for the size and surface condition of the pipeline, and there is still room for improvement in the response sensitivity to extremely small leakage. SUMMARY

[0005] The utility model aims at overcoming the defects of prior art, and provides a pipeline gas tightness detection device to solve the above problems.

[0006] The utility model discloses a pipeline gas tightness detection device, including the pipeline to be detected, the position of the inner wall of the pipeline to be detected close to its both ends is equipped with detection support no.

[0007] The utility model discloses a pipeline gas tightness detection device, including the pipeline to be detected, the position of the inner wall of the pipeline to be detected close to its both ends is equipped with detection support no.

[0008] Detection support no. Detection support no.

[0009] The utility model discloses a pipeline gas tightness detection device, including the pipeline to be detected, the position of the inner wall of the pipeline to be detected close to its both ends is equipped with detection support no.

[0010] The utility model discloses a pipeline gas tightness detection device, including the pipeline to be detected, the position of the inner wall of the pipeline to be detected close to its both ends is equipped with detection support no.

[0011] The utility model discloses a pipeline gas tightness detection device, including the pipeline to be detected, the position of the inner wall of the pipeline to be detected close to its both ends is equipped with detection support no.

[0012] The utility model discloses a pipeline gas tightness detection device, including the pipeline to be detected, the position of the inner wall of the pipeline to be detected close to its both ends is equipped with detection support no.

[0013] The utility model discloses a pipeline gas tightness detection device, including the pipeline to be detected, the position of the inner wall of the pipeline to be detected close to its both ends is equipped with detection support no.

[0014] The sealing sleeve one, the sealing sleeve two and the sealing plate are made of rubber, and the end cover is made of heat-resistant insulating material, and the end cover and the sealing plate are provided with through holes along the axial direction.

[0015] The utility model discloses beneficial effect is:

[0016] Firstly, the utility model discloses a structure that detection support and multiple cylinder bodies are arranged on the both ends of the inner wall of the pipeline, the plunger is slidably connected in each cylinder body, and the pressing block fixed at the tail end of the plunger is driven by the plunger, and the sealing sleeve of the outer sleeve realizes the accurate sealing of the inner wall of the pipeline, which makes the sealing sleeve uniformly expand outward when the external booster equipment (whether high-pressure hydrogen gas, hydraulic oil or water booster) transmits pressure to the detection support, and a firm and balanced sealing layer is formed with the inner wall of the pipeline, thereby effectively preventing medium leakage and ensuring the balanced transmission of the inner cavity pressure, improving the stability and repeatability of the overall detection.

[0017] Secondly, the device is provided with a piston rod and a piston mechanism, and a double sealing (including a piston sealing ring and a piston end face sealing ring) is arranged between the piston and the inner wall of the pipeline, which can rapidly discharge the original air in the pipeline after the medium fills the pipeline, so that the pipeline is filled with the selected pressurized medium, which not only ensures the consistency of the medium in the pipeline during detection, but also greatly shortens the detection reaction time, thereby improving the sensitivity and accuracy of the air tightness detection.

[0018] Thirdly, the utility model is provided with a shell, an end cover, an induction coil and a catalytic layer outside the pipeline, the shell and the end cover are made of heat-resistant insulating material, and a through-hole structure is arranged on the end cover, which helps to evenly release heat and prevent local overheating; the induction coil is heated by high-frequency current, driving the temperature of the catalytic layer (adopting a mesh structure, platinum resistance and an externally fixed platinum or platinum alloy layer) to rapidly rise, and once there is a small gap in the pipeline, the leaked medium (especially hydrogen) contacts the high-temperature catalytic layer, which will rapidly cause flameless combustion reaction, release heat and cause obvious changes in the resistance of the catalytic layer, and the external control system can monitor the changes in real time, thereby realizing high-sensitivity detection of the leakage state.

[0019] In addition, the detection support is designed as a hollow structure and is in communication with the cylinder body, and a plurality of cylinder bodies are arranged in a circular array and staggered along the outer end of the support, which effectively disperses the local stress generated during pressurization, avoids stress concentration, improves the pressure resistance and long-term stability of the entire device, and at the same time, the sealing sleeve is made of rubber material and is provided with anti-skid lines on the outer end, and is fixed on the outer end of the detection support through a clamp, which ensures the firm position of the sealing element under the condition of long-term vibration or pressure change, and reduces the risk of false detection caused by poor sealing.

[0020] Finally, the pressure regulating valve adopts a precision control mechanism with an adjusting screw, spring and adjusting ball, which can accurately set the preset pressure in the system and automatically open when the pressure reaches the set value, guiding the medium between the piston and the sealing sleeve. This fine control not only ensures the uniformity of medium filling, but also provides a guarantee for the adaptability of the system under different working conditions, making the overall detection process more reliable and stable. Attached Figure Description

[0021] Figure 1 This is an overall structural diagram of the present invention;

[0022] Figure 2 This is an exploded view of the entire utility model;

[0023] Figure 3 For the localized explosion of this utility model Figure 1 ;

[0024] Figure 4 For the localized explosion of this utility model Figure 2 ;

[0025] Figure 5 For the localized explosion of this utility model Figure 3 ;

[0026] Figure 6 For the localized explosion of this utility model Figure 4 ;

[0027] Figure 7 For the localized explosion of this utility model Figure 5 ;

[0028] Figure 8 This is a front view of the present invention;

[0029] Figure 9 For the present utility model Figure 8 Sectional view of AA;

[0030] Figure 10 For the present utility model Figure 9 BB section view;

[0031] Figure 11 For the present utility model Figure 9 Enlarged view at point C;

[0032] Figure 12 This is a structural diagram of the present utility model.

[0033] Explanation of the labels in the diagram

[0034] 1, to be detected pipeline; 2, detection support one; 3, detection support two; 4, cylinder; 5, plunger; 6, briquetting; 7, sealing sleeve one; 8, sealing sleeve two; 9, pressure regulating valve; 10, piston rod; 11, piston; 12, shell; 13, end cover; 14, induction coil; 15, catalytic layer; 16, sealing plate. DETAILED DESCRIPTION

[0035] The technical scheme of the utility model will be described below in connection with the embodiments, obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments, based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0036] It is explained that the orientation concepts of "left", "right", "up", "down", "front", "back", "inner" and "outer" in the following scheme are all relative directions, which will not be listed one by one here.

[0037] Embodiment 1

[0038] The embodiment adopts high-pressure hydrogen as the pressurizing medium, realizes the pipeline 1 air tightness detection through the cooperative work of each component, and the basic structure and connection relationship are as follows:

[0039] The pipeline 1 to be detected is fixedly installed with the detection support one 2 and the detection support two 3 respectively at the positions close to the two ends of the inner wall.

[0040] The outer side of the detection support one 2 and the detection support two 3 is fixedly connected with a plurality of cylinders 4, and each cylinder 4 is slidably connected with a plunger 5.

[0041] The end of the plunger 5 away from the cylinder 4 is fixedly connected with a briquetting 6, wherein all the briquettings 6 on the outer side of the detection support one 2 are uniformly sleeved with a sealing sleeve one 7, and all the briquettings 6 on the outer side of the detection support two 3 are uniformly sleeved with a sealing sleeve two 8.

[0042] The two ends of the pipeline 1 are connected with the external hydrogen pressurizing equipment through pipelines respectively, so as to ensure that the high-pressure hydrogen can be uniformly transmitted from the outside to the inside of the detection support one 2 and the detection support two 3.

[0043] The end of the detection support two 3 close to the detection support one 2 is fixedly connected with a pressure regulating valve 9 for conducting the high-pressure hydrogen when the pressure in the detection support two 3 reaches the preset value.

[0044] The piston rod 10 is slidably connected in the detection support one 2, the end of the piston rod 10 close to the detection support two 3 is fixedly connected with the piston 11, in order to ensure the sealing, the side of the piston 11 close to the inner wall of the pipeline 1 is fixedly connected with a piston sealing ring, and the side close to the detection support one 2 is fixedly connected with a piston end face sealing ring.

[0045] The outer end of the pipeline 1 is provided with a shell 12, and the inner wall of the shell 12 is fixedly connected with end covers 13 near both ends.

[0046] The two end covers 13 are fixedly connected with an induction coil 14, and the outer side of the induction coil 14 is fixedly connected with a catalytic layer 15. The catalytic layer 15 is of a mesh structure and is made of platinum resistance, and a platinum or platinum alloy layer is fixedly connected outside the catalytic layer 15.

[0047] The two end covers 13 are fixedly connected with sealing plates 16 at ends away from each other. The induction coil 14 and the catalytic layer 15 are electrically connected with an external control system through wires. The outer end of the end cover 13 is fixedly connected with the inner wall of the shell 12.

[0048] The sealing sleeves one 7 and two 8 and the sealing plates 16 are all made of rubber material. The end covers 13 are made of heat-resistant insulating material and are provided with through holes along the axial direction to ensure good heat conduction and electrical performance.

[0049] Working process

[0050] First, the pipeline 1 to be detected is passed through the sealing plates 16. Due to the rubber elasticity of the sealing plates 16, the pipeline 1 is firmly fixed in the detection position, ensuring the stability of the pipeline 1 during the entire detection process.

[0051] The detection support one 2 and the cylinder body 4, the plunger 5, the pressing block 6, the sealing sleeve one 7, the piston rod 10 and the piston 11 connected thereto are integrally loaded into the pipeline 1 and positioned near one end of the inner wall of the pipeline 1.

[0052] Subsequently, the detection support two 3 and the cylinder body 4, the plunger 5, the pressing block 6, the sealing sleeve two 8 and the pressure regulating valve 9 connected thereto are loaded into the pipeline 1 and positioned near the other end of the inner wall of the pipeline 1.

[0053] The positions of the piston rod 10 and the piston 11 are adjusted so that the piston 11 is in contact with the pressure regulating valve 9 to realize mutual cooperation in the preparatory state.

[0054] The external hydrogen pressurizing equipment is connected with the detection support one 2 and the detection support two 3 through pipelines to fill high-pressure hydrogen into the interiors thereof.

[0055] The high-pressure hydrogen in the detection support pushes the plunger 5 in the cylinder body 4 to slide along the inner wall of the pipeline 1, and the plunger 5 drives the pressing block 6 fixedly connected thereto to move.

[0056] The movement of the pressing block 6 forces the sealing sleeve one 7 and the sealing sleeve two 8 to expand radially outward to tightly contact the inner wall of the pipeline 1, thereby forming effective seals at both ends of the pipeline 1.

[0057] When the pressure in the detection bracket two 3 reaches the preset value, the pressure regulating valve 9 is automatically turned on, allowing part of the high-pressure hydrogen gas to enter the cavity between the piston 11 and the sealing sleeve two 8 on the piston rod 10 in the detection bracket one 2 through the pressure regulating valve 9.

[0058] Under the push of the high-pressure hydrogen gas, the piston 11 moves away from the sealing sleeve two 8 together with the piston rod 10, and the original air in the pipeline 1 is discharged, so that the pipeline 1 is quickly filled with high-pressure hydrogen gas.

[0059] At the same time, the external control system supplies high-frequency current to the induction coil 14, and the induction coil 14 generates heat energy by electromagnetic induction, so that the temperature of the pipeline 1 and the adjacent catalytic layer 15 rises.

[0060] The catalytic layer 15 adopts a mesh structure and is composed of platinum resistance, and is externally fixedly connected with a platinum or platinum alloy layer, which can quickly catalyze the flameless combustion reaction of hydrogen gas in a high-temperature environment.

[0061] When there is a small gap in the pipeline 1, the high-pressure hydrogen gas filled in the pipeline 1 will leak out of the gap, and the leaked hydrogen gas will quickly catalyze and burn after contacting the high-temperature catalytic layer 15, releasing heat and further increasing the temperature of the catalytic layer 15, thereby causing the resistance value of the catalytic layer 15 to change.

[0062] The external control system can accurately judge whether there is a leakage gap in the pipeline 1 by monitoring the change of the resistance value of the catalytic layer 15, thereby completing the detection of the air tightness of the pipeline 1.

[0063] The high-pressure hydrogen gas is input into the detection bracket one 2 and the detection bracket two 3 by using the external hydrogen gas pressurizing equipment, so that the plunger 5 in the cylinder body 4 is subjected to high pressure, driving the pressing block 6 to continuously push the sealing sleeve one 7 and the sealing sleeve two 8 to expand outwardly and form a firm seal with the inner wall of the pipeline 1, thereby significantly improving the sealing effect and ensuring the detection accuracy.

[0064] Through the combination of the piston 11 and the piston rod 10 and the double-sealing structure of the piston sealing ring and the piston end face sealing ring, the air in the pipeline 1 can be quickly and completely discharged under the action of high-pressure hydrogen gas, so that the pipeline 1 is quickly filled with high-pressure hydrogen gas, thereby realizing the stability and consistency of the detection environment.

[0065] The induction coil 14 and the catalytic layer 15 adopt high-frequency heating mode, so that the catalytic layer 15 can quickly catalyze the flameless combustion reaction of the leaked hydrogen gas at high temperature, and the released heat causes the change of the temperature and resistance value of the catalytic layer 15, thereby realizing high-sensitivity detection of the small leakage and ensuring the accuracy of the detection result.

[0066] The casing 12, the end cover 13 and the sealing plate 16 are designed by using heat-resistant insulating materials and rubber materials, which not only ensure the stable operation of the device under high temperature and high pressure conditions, but also prolong the service life of the equipment, and improve the safety and reliability of the whole system.

[0067] In summary, the embodiment realizes high-sensitivity and high-accuracy detection of the gas tightness of the pipeline 1 by means of high-pressure hydrogen filling, precise mechanical transmission and catalytic heat release detection, and has the advantages of simple structure, convenient operation, rapid response and the like, and is suitable for various pipeline systems requiring high-precision gas tightness detection.

[0068] Embodiment 2

[0069] On the basis of embodiment 1, the embodiment is improved in the following aspects: the detection support one 2 and the detection support two 3 are both hollow structures, and the cylinder body 4 corresponding to each of them is in communication; the sealing sleeve one 7 and the sealing sleeve two 8 are both made of elastic materials, and the outer ends thereof are provided with anti-skid patterns and are fixed to the outer ends of the detection support one 2 and the detection support two 3 by means of clamps; the pressure regulating valve 9 is provided with an adjusting screw, a spring and an adjusting ball to accurately control the pressure; in addition, the external pressure boosting equipment selects hydraulic oil (or water) as the pressure boosting medium, and the cylinder bodies 4 are arranged in a circular staggered manner along the axis of the detection support one 2 to further optimize the stress, which will be described in detail as follows:

[0070] The embodiment adopts hydraulic oil to boost the detection of the gas tightness of the pipeline 1 to be detected, and the main structure and improved features thereof are as follows:

[0071] The inner wall of the pipeline 1 to be detected is fixedly installed with the detection support one 2 and the detection support two 3 near the two ends, respectively, and both of them are hollow structures, and the hollow parts thereof are in communication with the corresponding cylinder bodies 4, so that the hydraulic oil can quickly and uniformly enter the system.

[0072] The outer ends of the detection support one 2 and the detection support two 3 are both fixedly connected with a plurality of cylinder bodies 4, each of which is slidably connected with a plunger 5, and the end of the plunger 5 away from the cylinder body 4 is fixedly connected with a pressing block 6.

[0073] All the pressing blocks 6 on the outer side of the detection support one 2 are uniformly sleeved with the sealing sleeve one 7, and all the pressing blocks 6 on the outer side of the detection support two 3 are uniformly sleeved with the sealing sleeve two 8, and the sealing sleeve one 7 and the sealing sleeve two 8 are both made of rubber, and the outer ends thereof are provided with anti-skid patterns and are fixedly connected to the outer ends of the detection support one 2 and the detection support two 3 by means of clamps, respectively, so as to ensure that they do not slip under the action of the hydraulic oil.

[0074] The two ends of the pipeline 1 to be detected are both connected with the external hydraulic oil pressure boosting equipment through pipelines.

[0075] The detection support two 3 is fixedly connected with a pressure regulating valve 9 at one end close to the detection support one 2, and a regulating screw is threadedly connected with the pressure regulating valve 9 at an end away from the detection support two 3; the regulating screw is provided with a spring at one end close to the detection support two 3, and the spring is in contact with a regulating ball, thereby forming a mechanism for fine regulation and control of preset pressure; the conduction direction of the pressure regulating valve 9 is the direction in which the detection support two 3 points to the detection support one 2, so as to ensure that the hydraulic oil flows in the system according to a predetermined path.

[0076] The detection support one 2 is slidably connected with a piston rod 10, and the piston rod 10 is fixedly connected with a piston 11 at one end close to the detection support two 3.

[0077] The piston 11 is fixedly connected with a piston sealing ring at one end close to the inner wall of the pipeline 1 and is fixedly connected with a piston end face sealing ring at one end close to the detection support one 2, so as to ensure that a tight seal is formed between the piston 11 and the inner wall of the pipeline 1 during the process of pressurizing the hydraulic oil.

[0078] The outer end of the pipeline 1 to be detected is provided with a shell 12, and the inner wall of the shell 12 is fixedly connected with end covers 13 close to the two ends respectively.

[0079] The two end covers 13 are fixedly connected with an induction coil 14 between them, and the induction coil 14 is fixedly connected with a catalytic layer 15 outside. The catalytic layer 15 is of a mesh structure and is made of platinum resistance, and is externally fixed with a platinum or platinum alloy layer.

[0080] The two end covers 13 are fixedly connected with sealing plates 16 at ends away from each other, and the sealing plates 16 realize pipeline fixation by using rubber elasticity after being in contact with the pipeline 1.

[0081] The induction coil 14 and the catalytic layer 15 are electrically connected with an external control system through wires, so as to facilitate real-time monitoring of the state of the pipeline 1. Meanwhile, the end covers 13 are fixedly connected with the inner wall of the shell 12 and are provided with through holes in the axial direction, so as to ensure good heat conduction and heat dissipation.

[0082] The plurality of cylinder bodies 4 at the outer end of the detection support one 2 are distributed in a circumferential array around the axis of the detection support one 2, and adjacent two cylinder bodies 4 are staggered in the axial direction of the detection support one 2, so as to realize uniform pressure transmission.

[0083] Working process

[0084] Firstly, the pipeline 1 to be detected is passed through the sealing plates 16, and the sealing plates 16 firmly fix the pipeline 1 at a predetermined detection position by using the elastic effect of the rubber material, so as to ensure the stability of the pipeline 1 during the entire detection process.

[0085] The detection support one 2 and the cylinder body 4, the plunger 5, the pressing block 6, the sealing sleeve one 7, the piston rod 10 and the piston 11 connected therewith are placed in the position close to one end of the inner wall of the pipeline 1;

[0086] Subsequently, the detection bracket two 3 and the cylinder body 4, plunger 5, pressing block 6, sealing sleeve two 8 and pressure regulating valve 9 connected therewith are placed in the position close to the other end of the inner wall of the pipeline 1;

[0087] Adjust the position of the piston rod 10 and the piston 11, so that the piston 11 forms a predetermined matching state with the pressure regulating valve 9, laying the foundation for subsequent hydraulic oil flow.

[0088] The external hydraulic oil pressurizing device fills high-pressure hydraulic oil into the detection bracket one 2 and the detection bracket two 3 through the pipeline.

[0089] Since the detection bracket one 2 and the detection bracket two 3 are hollow structures and are connected with the cylinder body 4, the high-pressure hydraulic oil quickly fills the inside of the system.

[0090] The uniform pressurization of the hydraulic oil pushes the plunger 5 in the cylinder body 4 to slide along the inner wall of the pipeline 1, and the plunger 5 drives the fixedly connected pressing block 6 to move, so that the sealing sleeve one 7 and the sealing sleeve two 8 expand outward under the action of the clamp and the anti-skid pattern, and tightly contact with the inner wall of the pipeline 1, thereby forming reliable sealing at both ends of the pipeline 1.

[0091] When the hydraulic oil pressure in the detection bracket two 3 reaches the preset value of the pressure regulating valve 9, the pressure regulating valve 9 is automatically turned on under the precise regulation of the adjusting screw, spring and adjusting ball.

[0092] At this time, the hydraulic oil flows from the detection bracket two 3 to the cavity between the piston 11 and the sealing sleeve two 8 in the detection bracket one 2 through the pressure regulating valve 9.

[0093] The piston 11 moves along the inner wall of the pipeline 1 under the push of the hydraulic oil, and the double sealing formed by the piston sealing ring and the piston end face sealing ring expels the original air in the pipeline 1, so that the pipeline 1 is quickly filled with high-pressure hydraulic oil, ensuring uniform and stable internal pressure.

[0094] At the same time, the external control system inputs high-frequency current to the induction coil 14, and the induction coil 14 heats the pipeline 1 and the catalytic layer 15 by electromagnetic induction, so that the temperature of the two is increased.

[0095] Although the hydraulic oil molecules are larger, the leakage phenomenon is slower than that of gas, but if there is a small gap in the pipeline 1, the high-pressure hydraulic oil will still leak slowly along the gap, causing the internal pressure of the system to decrease slightly over time.

[0096] In addition, the temperature rise makes the catalytic layer 15 (composed of platinum resistance and fixed with a layer of platinum or platinum alloy) extremely sensitive to temperature changes, and the external control system can assist in judging whether the pipeline 1 has a leak by monitoring the temperature and resistance changes of the induction coil 14 and the catalytic layer 15, further improving the detection sensitivity.

[0097] In use, the pipeline to be detected 1 is passed through the two sealing plates 16, which are fixed to the pipeline to be detected 1 under the elastic force of the sealing plates 16, and then the detection bracket one 2 and the cylinder body 4, the plunger 5, the pressing block 6, the sealing sleeve one 7, the piston rod 10 and the piston 11 connected thereto are placed on the inner wall of the pipeline to be detected 1 near the port thereof, and then the detection bracket one 2 and the cylinder body 4, the plunger 5, the pressing block 6, the sealing sleeve one 7 and the pressure regulating valve 9 connected thereto are placed on the inner wall of the pipeline to be detected 1 near the other end thereof; then the position of the piston rod 10 and the piston 11 is adjusted, so that the piston 11 is abutted against the pressure regulating valve 9 at one end thereof.

[0098] Then high-pressure hydrogen is filled into the detection bracket one 2 and the detection bracket two 3 through an external pressurizing device, at this time the high-pressure hydrogen in the detection bracket one 2 and the detection bracket two 3 pushes the plungers 5 in the corresponding cylinder bodies 4 to move towards the inner wall of the pipeline to be detected 1, the plungers 5 in turn drive the corresponding pressing blocks 6 to move, and the plurality of pressing blocks 6 in turn push the corresponding sealing sleeves one 7 and the sealing sleeves two 8 to expand outward, so that the sealing sleeves one 7 and the sealing sleeves two 8 abut against the inner wall of the pipeline to be detected 1, and the sealing sleeves one 7 and the sealing sleeves two 8 extruded on the inner wall of the pipeline to be detected 1 seal the two ends of the inner wall of the pipeline to be detected 1, when the pressure in the detection bracket two 3 reaches the preset pressure of the pressure regulating valve 9, the pressure regulating valve 9 begins to conduct, and the high-pressure hydrogen enters between the piston 11 and the sealing sleeves two 8 through the pressure regulating valve 9, since the piston 11 and the inner wall of the pipeline to be detected 1 are in a sealed state, at this time the high-pressure hydrogen pushes the piston 11 and the piston rod 10 to move away from the sealing sleeves two 8, and the piston 11 discharges the air in the pipeline to be detected 1 in the moving process, so that the pipeline to be detected 1 is filled with hydrogen, at this time if the pipeline to be detected 1 has a gap, then the hydrogen will leak from the gap to the outside of the pipeline to be detected 1.

[0099] At the same time, high-frequency current is input to the induction coil 14 through an external control system, and the induction coil 14 heats the pipeline to be detected 1 and the catalytic layer 15 through electromagnetic induction, so that the temperature of the pipeline to be detected 1 and the catalytic layer 15 is increased, and the increased temperature can better detect whether the pipeline to be detected 1 has a gap.

[0100] When the hydrogen leaks, the catalytic layer on the catalytic layer 15 is catalyzed, and then a flameless combustion reaction occurs, which releases heat, causing the temperature of the platinum resistance to rise, and the change of the resistance value of the platinum resistance is proportional to the concentration of the hydrogen, so that the concentration of the hydrogen can be determined by measuring the change of the resistance, thereby detecting whether the hydrogen leaks, and further judging whether the pipeline to be detected 1 has a gap, and the molecular diameter of the hydrogen is relatively small, so under the same conditions, the hydrogen is more likely to penetrate from a small gap than other gases with larger molecular diameters, and the air tightness of the pipeline to be detected 1 can also be detected by hydraulic pressure or other ways.

[0101] The detection support one 2 and the detection support two 3 are hollow structures, and are communicated with the cylinder body 4, so that the hydraulic oil is uniformly distributed in the system, thereby driving the plunger 5 and the pressing block 6 to move, and the sealing sleeve one 7 and the sealing sleeve two 8 are in firm contact with the inner wall of the pipeline 1 under the action of the clamps and the anti-skid lines, reliable sealing is realized, and the detection data is ensured to be accurate.

[0102] The pressure regulating valve 9 is composed of a regulating screw, a spring and a regulating ball, and can accurately set the preset pressure when the hydraulic oil is pressurized, and when the pressure reaches the set value, the hydraulic oil is automatically guided to flow into the space between the piston 11 and the sealing sleeve two 8, so that the piston 11 is rapidly moved, the air in the pipeline 1 is discharged, the pipeline 1 is ensured to be rapidly filled with the hydraulic oil, and the detection consistency is improved.

[0103] The multiple cylinder bodies 4 at the outer end of the detection support one 2 are arranged in a circumferential array and staggered along the axis, so that the local stress generated when the hydraulic oil is pressurized can be effectively dispersed, the stress concentration phenomenon is reduced, and the pressure resistance and stability of the overall system are improved.

[0104] The temperature of the pipeline 1 and the catalytic layer 15 is increased by high-frequency heating of the induction coil 14; in the case of a slight leakage of the hydraulic oil, the slight changes in the temperature and the pressure can be captured by the sensitive monitor, so that the leakage state of the pipeline 1 is timely warned, and the accuracy and reliability of the detection result are ensured.

[0105] The sealing sleeve one 7, the sealing sleeve two 8 and the sealing plate 16 are all made of rubber, and have good elasticity and wear resistance; the end cover 13 is made of heat-resistant insulating material and is provided with a through hole, so that the safe operation in a high-temperature environment is ensured; the overall structure is simple in design, convenient to install and low in maintenance cost, and is suitable for the air tightness detection of various pipeline systems.

[0106] In summary, in the embodiment 2, the hydraulic oil is used as the pressurizing medium, the detection support with a hollow structure, the pressure regulating valve 9 with fine regulation, the cylinder bodies 4 arranged uniformly and the piston 11 with double sealing are combined, so that the air tightness detection of the pipeline 1 is efficiently, stably and accurately controlled, the structure is reasonable, the sealing performance is excellent, the operation is simple, and the embodiment is suitable for various pipeline systems which need to be detected in the hydraulic mode.

[0107] The preferred embodiments of the utility model are described above, and it should be understood that the utility model is not limited to the forms disclosed in the present disclosure, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified by the above-mentioned teaching or related technical or knowledge within the scope of the present disclosure, and the modification and change made by the person skilled in the art without departing from the spirit and scope of the utility model should be within the protection scope of the claims attached to the utility model.

Claims

1. Device for detecting the tightness of a pipe, comprising a pipe (1) to be tested, characterized in that, The inner wall of the pipeline (1) to be detected is provided with detection support one (2) and detection support two (3) near both ends respectively, a plurality of cylinder bodies (4) are fixedly connected to the outer ends of the detection support one (2) and the detection support two (3), a plunger (5) is slidably connected in each cylinder body (4), a pressing block (6) is fixedly connected to the end of the plunger (5) away from the cylinder body (4), the outer ends of the plurality of pressing blocks (6) on the outer side of the detection support one (2) are sleeved with the same sealing sleeve one (7), the outer ends of the plurality of pressing blocks (6) on the outer side of the detection support two (3) are sleeved with the same sealing sleeve two (8), the ends away from each other of the detection support one (2) and the detection support two (3) are connected with external pressure boosting equipment through pipelines, a pressure regulating valve (9) is fixedly connected to the end of the detection support two (3) close to the detection support one (2), a piston rod (10) is slidably connected in the detection support one (2), a piston (11) is fixedly connected to the end of the piston rod (10) close to the detection support two (3), an outer end of the pipeline (1) to be detected is provided with a shell (12), end covers (13) are fixedly connected to the inner walls of the shell (12) near both ends, an induction coil (14) is fixedly connected between the two end covers (13), and a catalytic layer (15) is arranged on the outer side of the induction coil (14).

2. The apparatus of claim 1, wherein: The ends away from each other of the two end covers (13) are fixedly connected with sealing plates (16), and the induction coil (14) and the catalytic layer (15) are electrically connected with an external control system through wires.

3. The apparatus of claim 1, wherein: The detection support one (2) and the detection support two (3) are hollow structures, and the hollow parts are communicated with the corresponding cylinder bodies (4), and the conduction direction of the pressure regulating valve (9) is the direction in which the detection support two (3) points to the detection support one (2).

4. The apparatus of claim 1, wherein: The sealing sleeve one (7) and the sealing sleeve two (8) are made of elastic material, and the outer ends of the sealing sleeve one (7) and the sealing sleeve two (8) are provided with anti-skid lines, the outer ends of the sealing sleeve one (7) are fixedly connected with the detection support one (2) through clamps, and the outer ends of the sealing sleeve two (8) are also fixedly connected with the detection support two (3) through clamps.

5. The apparatus of claim 1, wherein: A regulating screw is threadedly connected to the end of the pressure regulating valve (9) away from the detection support two (3), a spring is arranged in contact with the end of the regulating screw close to the detection support two (3), and a regulating ball is arranged in contact with the end of the spring close to the detection support two (3).

6. The apparatus of claim 1, wherein: The plurality of cylinder bodies (4) on the outer end of the detection support one (2) are distributed in a circular array around the axis of the detection support one (2), and two adjacent cylinder bodies (4) are arranged in a staggered manner along the axis direction of the detection support one (2).

7. The apparatus of claim 1, wherein: A piston sealing ring is fixedly connected to the end of the piston (11) close to the inner wall of the pipeline (1) to be detected, and a piston end face sealing ring is fixedly connected to the end of the piston (11) close to the detection support one (2).

8. The apparatus of claim 1, wherein: The catalytic layer (15) is in a net structure and is made of platinum resistance, and is externally fixedly connected with a platinum or platinum alloy layer, and the external pressure boosting device is a water pressure boosting device or a hydraulic oil pressure boosting device or a hydrogen pressure boosting device.

9. The apparatus of claim 1, wherein: The sealing sleeve one (7), the sealing sleeve two (8) and the sealing plate (16) are all made of rubber, the end cover (13) is made of heat-resistant insulating material, and the end cover (13) and the sealing plate (16) are both provided with through holes along the axial direction.

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