A gas leakage detection device for welding an adiabatic gas cylinder

Abstract

The utility model discloses a kind of gas leakage detection devices of welded heat-insulated gas cylinder, it is related to gas leakage detection technical field, and the gas leakage detection device of welded heat-insulated gas cylinder includes gasbag and flow detector, one end of gasbag is open setting, for covering the valve of the outside of welded heat-insulated gas cylinder and covering welded heat-insulated gas cylinder, gasbag is connected with welded heat-insulated gas cylinder by sealing structure and sealing, flow detector is set by pipeline and communicates gasbag, and flow detector is used to detect the gas flow of the valve leakage of welded heat-insulated gas cylinder.Such setting, gasbag and the outside of welded heat-insulated gas cylinder are sealed by sealing structure and sealing, to guarantee the sealing performance of the gas leakage detection device of welded heat-insulated gas cylinder, adopt gasbag, to reduce the volume and weight of the gas leakage detection device of welded heat-insulated gas cylinder, and when not needing to carry out leakage detection, user can store the gas leakage detection device of welded heat-insulated gas cylinder, convenient to dismount and carry.

Description

Technical Field

[0001] This utility model relates to the field of gas leak detection technology, and in particular to a gas leak detection device for welded insulated gas cylinders. Background Technology

[0002] With the increasing demand for the storage and transportation of high-pressure, low-temperature, flammable, and toxic gases, welded insulated gas cylinders, as core pressure-bearing equipment, have been widely used in the energy, chemical, cryogenic medical, and industrial gas fields. However, in recent years, safety accidents caused by micro-leakage of welded insulated gas cylinders have shown an upward trend, prompting quantitative leakage detection technology to become a research hotspot in the field of special equipment safety.

[0003] However, existing leak detection technologies cannot simultaneously achieve both strong sealing performance and small size and lightweight characteristics. Utility Model Content

[0004] The main purpose of this invention is to propose a gas leakage detection method for welded insulated gas cylinders, aiming to improve the existing leakage detection technology, which cannot simultaneously achieve strong sealing performance and small size and lightweight characteristics.

[0005] To achieve the above objectives, the present invention proposes a gas leak detection device for welded insulated gas cylinders, used to detect leaks in the cylinder head and various pipelines at the cylinder head. The gas leak detection device for welded insulated gas cylinders includes:

[0006] An airbag, one end of which is open, is used to cover the exterior of the welded insulating gas cylinder and enclose its valve. The airbag is sealed to the welded insulating gas cylinder via a sealing structure.

[0007] A flow detector, connected to the gas bladder via a pipe, is used to detect the gas flow rate of valve leakage from the welded insulated gas cylinder.

[0008] In one embodiment, the sealing structure includes a first sealing part, which is elastically disposed and used to be sleeved on the outside of the welded heat-insulating gas cylinder, and the outer side of the first sealing part is connected to the air bag.

[0009] In one embodiment, the gas leak detection device for the welded insulated gas cylinder further includes a locking structure, which is sleeved on the outer side of the gas bag and is provided corresponding to the first sealing part. The locking structure is used to lock the gas bag to the outer side of its first sealing part.

[0010] In one embodiment, the locking structure includes:

[0011] The second sealing part is elastically disposed, sleeved on the outer side of the airbag, and corresponding to the first sealing part; and,

[0012] The locking part is arranged in a ring shape and its inner diameter is adjustable. The locking part is sleeved on the outer side of the second sealing part and is used to lock the airbag to the outside of the welded heat-insulating gas cylinder.

[0013] In one embodiment, the locking part includes:

[0014] A locking piece, wherein the locking piece is circumferentially disposed on the periphery of the second sealing portion, and the opposite ends of the locking piece are provided with connecting portions protruding in a direction away from the second sealing portion; and,

[0015] An adjustment section is provided connecting the two connecting sections, and is capable of adjusting the distance between the two connecting sections.

[0016] In one embodiment, the first sealing portion and the second sealing portion are arranged with equal diameters.

[0017] In one embodiment, the airbag is made of rubber or nylon fabric.

[0018] In one embodiment, the airbag has a through hole that avoids the open end of the airbag;

[0019] The pipe extends from the through hole into the airbag and is fixedly connected to the wall of the through hole;

[0020] The gas leak detection device for the welded insulated gas cylinder also includes a support structure, which is located inside the gas bladder and connected to the pipeline. The support structure is used to support the welded insulated gas cylinder.

[0021] In one embodiment, the support structure includes:

[0022] Multiple support rods, each with one end connected to the pipe and the other end angled away from each other; and...

[0023] Multiple fixing rings are provided, with any two fixing rings having different diameters. Each fixing ring is fixedly connected to multiple support rods. The fixing ring furthest from the pipeline is used to abut against the welded insulated gas cylinder.

[0024] In one embodiment, the pipeline is further provided with a branch pipe, one end of which is connected to the pipeline and the other end is provided with a pressure detector, which is used to detect the air pressure in the branch pipe.

[0025] In this invention, the user first covers the valve of the welded insulated gas cylinder with the open end of the airbag, and then places the airbag over the outside of the cylinder. Since the airbag is connected to the sealing structure, the sealing structure can seal the airbag and the cylinder, ensuring the airtightness of the airbag's internal space. Thus, when the valve of the welded insulated gas cylinder leaks, the leaking gas first flows into the internal space of the airbag. This gas fills the internal space of the airbag, causing it to inflate. At this point, the pressure inside the airbag is slightly higher than the external atmospheric pressure. Under this slight positive pressure, the gas inside the airbag is compressed and flows through the pipe to the flow detector, and then is discharged to atmospheric pressure. The flow detector can then detect the flow rate of the gas, thereby measuring the amount of gas leaking from the welded insulated gas cylinder. This configuration, through the sealing structure, seals the airbag to the outside of the welded insulated gas cylinder, ensuring the sealing performance of the gas leak detection device for the welded insulated gas cylinder. Simultaneously, the use of the airbag reduces the size and weight of the gas leak detection device, while also providing rapid and efficient measurement at low manufacturing costs. When leak detection is not required, the user can fold the airbag and detach the flow detector from the pipe, thus storing the gas leak detection device for easy assembly, disassembly, and transport. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0027] Figure 1 A schematic diagram of an embodiment of the gas leakage detection device for welded insulated gas cylinders provided by this utility model;

[0028] Figure 2 for Figure 1 A partial cross-sectional schematic diagram of a gas leak detection device for welded insulated gas cylinders.

[0029] Figure 3 for Figure 1 A schematic diagram of the supporting structure.

[0030] Explanation of icon numbers:

[0031] 100. Gas Leakage Detection Device for Welded Insulated Gas Cylinders; 1. Gas Bag; 2. Sealing Structure; 21. First Sealing Part; 3. Flow Detector; 4. Pipeline; 41. Branch Pipe; 5. Locking Structure; 51. Second Sealing Part; 52. Locking Part; 521. Locking Plate; 522. Connecting Part; 523. Adjusting Part; 6. Support Structure; 61. Support Rod; 62. Fixing Ring; 7. Pressure Detector.

[0032] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0035] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0036] This invention proposes a gas leak detection device for welded insulated gas cylinders. It aims to improve upon existing leak detection technologies, which cannot simultaneously achieve strong sealing performance while maintaining a small size and lightweight design.

[0037] Please see Figure 1-2In one embodiment of this utility model, the gas leakage detection device 100 for the welded insulated gas cylinder includes an air bag 1 and a flow detector 3. One end of the air bag 1 is open and is used to cover the outside of the welded insulated gas cylinder and cover the valve of the welded insulated gas cylinder. The air bag 1 is sealed to the welded insulated gas cylinder through a sealing structure 2. The flow detector 3 is connected to the air bag 1 through a pipe 4 and is used to detect the gas flow rate leaking from the valve of the welded insulated gas cylinder.

[0038] In this invention, the user first covers the valve of the welded insulated gas cylinder with the open end of the airbag 1. Then, the airbag 1 is placed over the outside of the welded insulated gas cylinder. Since the airbag 1 is connected to the sealing structure 2, the sealing structure 2 can seal the connection between the airbag 1 and the welded insulated gas cylinder, thus ensuring the airtightness of the internal space of the airbag 1. When the valve of the welded insulated gas cylinder leaks, the gas leaking from the valve first flows into the internal space of the airbag 1. At this time, the gas leaking from the valve of the welded insulated gas cylinder fills the internal space of the airbag 1, causing the airbag 1 to inflate. At this time, the pressure inside the airbag 1 is slightly higher than the external atmospheric pressure. Under a slight positive pressure, the gas inside the airbag 1 is squeezed and flows through the pipe 4 to the flow detector 3, and is discharged from the flow detector 3 to atmospheric pressure. At this time, the flow detector 3 can detect the flow rate of the gas flowing through it, thereby measuring the amount of gas leakage from the welded insulated gas cylinder. This configuration, through the sealing structure 2, seals the airbag 1 to the outside of the welded insulated gas cylinder, ensuring the sealing performance of the gas leak detection device 100 for the welded insulated gas cylinder. Simultaneously, the use of the airbag 1 reduces the size and weight of the gas leak detection device 100, while also providing rapid and efficient measurement at low manufacturing costs. When leak detection is not required, the user can fold the airbag 1 and detach the flow detector 3 from the pipe 4, thus storing the gas leak detection device 100 for easy assembly, disassembly, and transport.

[0039] It should be noted that, in order to ensure that the gas leaking from the valve of the welding insulation gas cylinder can allow the airbag 1 to inflate smoothly, the thickness of the airbag 1 needs to be further limited. In one embodiment of this utility model, the thickness of the airbag 1 is A, 0.2mm≤A≤1.5mm; at the same time, in order to ensure that the airbag 1 can cover the valve of the welding insulation gas cylinder while being fitted on the outside of the welding insulation gas cylinder, in another embodiment of this utility model, the height of the airbag 1 is B, 500mm≤B≤600mm.

[0040] It should also be noted that the material of the airbag 1 is not limited in this utility model. In one embodiment of this utility model, the material of the airbag 1 includes rubber; in another embodiment of this utility model, the material of the airbag 1 includes nylon fabric; in other embodiments of this utility model, the material of the airbag 1 can also be set to other materials, as long as the sealing performance of the airbag 1 is guaranteed and the airbag 1 has a certain elasticity. In actual setting, it can be selected according to the requirements.

[0041] It is understood that this utility model does not limit the specific connection position between the airbag 1 and the sealing structure 2. In one embodiment of this utility model, the open end of the airbag 1 is connected to the upper end of the sealing structure 2. With this arrangement, the sealing structure 2 can seal the connection between the welded heat insulation gas cylinder and the airbag 1, thereby ensuring the airtightness of the internal space of the airbag 1.

[0042] In another embodiment of this utility model, the sealing structure 2 includes a first sealing part 21, which is elastically disposed and used to be sleeved on the outside of the welded insulating gas cylinder. The outer side of the first sealing part 21 is connected to the airbag 1. With this arrangement, the inner side of the first sealing part 21 abuts against the outside of the welded insulating gas cylinder, and the outer side is connected to the airbag 1, so as to achieve a sealed connection between the airbag 1 and the welded insulating gas cylinder, ensuring the airtightness of the internal space of the airbag 1.

[0043] It is understood that, in this embodiment, in order to ensure the elastic sealing capability of the first sealing part 21 to the welded heat insulation gas cylinder, the inner ring diameter of the first sealing part 21 is smaller than the diameter of the welded heat insulation gas cylinder.

[0044] Of course, this utility model does not limit the specific value of the inner ring diameter of the first sealing part 21. Typically, the diameter of a welded insulated gas cylinder is 508mm or 768mm. In this utility model, it is only necessary to ensure that the elastic expansion rate of the first sealing part 21 is between 110% and 160% when it is fitted onto the cylinder body. This ensures both the sealing performance and ease of assembly / disassembly of the first sealing part 21, while also ensuring a long service life for the first sealing ring. In a specific embodiment of this utility model, for a welded insulated gas cylinder with a cylinder diameter of 508mm, the inner ring diameter of the first sealing part 21 is set to 400mm; for a welded insulated gas cylinder with a cylinder diameter of 768mm, the inner ring diameter of the first sealing part 21 is set to 600mm. With this setting, when the first sealing part 21 is fitted onto the outside of the welded insulated gas cylinder, its expansion rate is approximately 127% / 128%, which can simultaneously ensure both sealing performance and service life.

[0045] This invention does not limit the thickness of the first sealing part 21. In the embodiments of this invention, the thickness of the first sealing part 21 is C, where 3mm ≤ C ≤ 5mm. This ensures the sealing performance of the first sealing part 21 while improving its structural strength.

[0046] Meanwhile, by setting the sealing structure 2 as the first sealing part 21, the direct contact between the airbag 1 and the welded insulated gas cylinder can be further isolated. Since the material of the welded insulated gas cylinder is usually set as a rigid material, and during long-term use, the surface of the welded insulated gas cylinder gradually becomes rough and a large number of small burrs are generated. Thus, if the welded insulated gas cylinder comes into direct contact with the soft airbag 1, it is easy to cause the airbag 1 to break, which in turn causes poor sealing of the internal space of the airbag 1 and affects the detection results of the flow detector 3.

[0047] Furthermore, by setting the first sealing part 21, the first sealing part 21 is in elastic contact with the outside of the welded insulation gas cylinder. Under the action of elasticity, the first sealing part 21 can fill the contact surface of the welded insulation gas cylinder that is uneven, so as to further improve the sealing effect and ensure the accuracy of the detection result of the flow detector 3.

[0048] It should be noted that when only the first sealing part 21 is provided, since the open end of the airbag 1 is connected to the outer side of the first sealing part 21, during the process of the first sealing part 21 being fitted onto the welding insulation gas cylinder, the airbag 1 may directly contact the outside of the welding insulation gas cylinder, which may cause the welding insulation gas cylinder to puncture the airbag 1. Furthermore, since the inner ring diameter of the first sealing part 21 is smaller than the diameter of the welding insulation gas cylinder, when leakage detection is not required, the first sealing part 21 will return to its original shape and squeeze the open end of the airbag 1. Over time, this may cause the connection between the first sealing part 21 and the airbag 1 to fail, thereby affecting the airtightness of the gas leakage detection device 100 for the welding insulation gas cylinder.

[0049] Therefore, in another embodiment of this utility model, the outer side of the first sealing part 21 is detachably connected to the airbag 1. The gas leakage detection device 100 of the welded insulated gas cylinder further includes a locking structure 5. The locking structure 5 is sleeved on the outer side of the airbag 1 and is provided corresponding to the first sealing part 21. The locking structure 5 is used to lock the airbag 1 to the outer side of its first sealing part 21. With this configuration, when it is necessary to detect leakage of the welded insulated gas cylinder, the user first sleeves the first sealing part 21 on the outside of the welded insulated gas cylinder so that the first sealing part 21 elastically abuts against the outside of the welded insulated gas cylinder. Then, the user covers the valve of the welded insulated gas cylinder with the open end of the airbag 1 and sleeves the airbag 1 on the outside of the welded insulated gas cylinder so that the airbag 1 is pressed against the outer side of the first sealing part 21 to abut against the first sealing part 21. Finally, the user sleeves the locking structure 5 on the outer side of the airbag 1. The outer surface of the airbag 1 is designed to fit tightly with the first sealing part 21, thereby ensuring the airtightness between the airbag 1 and the first sealing part 21, and thus ensuring the airtightness of the gas leak detection device 100 for the welded insulated gas cylinder. Furthermore, by setting the first sealing part 21 and the airbag 1 as separate units, they can be respectively fitted onto the outside of the welded insulated gas cylinder, thereby further improving the safety of the airbag 1 during the user's use of the gas leak detection device 100 for the welded insulated gas cylinder.

[0050] It should be noted that when the airbag 1 is squeezed and locked onto the first sealing part 21 by the locking structure 5, in order to avoid wrinkles on the contact surface between the airbag 1 and the first sealing part 21, which would result in poor squeezing effect and affect the sealing performance of the gas leak detection device 100 of the welded heat insulation gas cylinder, in one embodiment of this utility model, the diameter of the airbag 1 is set to be the same as that of the welded heat insulation gas cylinder. In this way, when the airbag 1 is fitted onto the first sealing part 21, the airbag 1 will undergo slight elastic deformation to ensure the smoothness of the contact surface between the airbag 1 and the first sealing part 21.

[0051] Of course, this utility model does not limit the specific structural form of the locking structure 5. In one embodiment of this utility model, the locking structure 5 can be set as a locking rope. By tying the locking rope to the outside of the airbag 1, the airbag 1 is squeezed and locked onto the first sealing part 21 to ensure the contact sealing between the airbag 1 and the first sealing part 21.

[0052] In another embodiment of the present invention, the locking structure 5 includes a second sealing part 51 and a locking part 52. The second sealing part 51 is elastically disposed and is sleeved on the outer side of the airbag 1 and is disposed corresponding to the first sealing part 21. The locking part 52 is annularly disposed and its inner diameter is adjustable. The locking part 52 is sleeved on the outer side of the second sealing part 51 and is used to lock the airbag 1 to the outside of the welded heat-insulating gas cylinder. With this configuration, when the first sealing part 21 and the airbag 1 are sequentially fitted onto the welded insulated gas cylinder, the second sealing part 51 is then fitted onto the outer side of the airbag 1, with the second sealing part 51 corresponding to the first sealing part 21. Thus, under the elastic action, the second sealing part 51 can also lock the airbag 1 onto the first sealing part 21, thereby improving the contact sealing between the airbag 1 and the first sealing part 21. Then, the locking part 52 is fitted onto the outer side of the second sealing part 51, locking the second sealing part 51 onto the airbag 1. In this way, the locking part 52 can further improve the sealing performance of the gas leak detection device 100 of the welded insulated gas cylinder, ensuring the accuracy of the detection results.

[0053] Similarly, in this invention, to ensure the sealing capability of the second sealing part 51, the inner ring diameter of the second sealing part 51 is smaller than the diameter of the welded heat insulation gas cylinder.

[0054] This invention does not limit the specific value of the inner ring diameter of the second sealing part 51. In this invention, it is only necessary to ensure that when the first sealing part 21 is fitted onto the bottle body, the elastic expansion rate of the second sealing part 51 is between 110% and 160%, so as to ensure the sealing performance and ease of disassembly and assembly of the second sealing part 51, while ensuring that the second sealing ring has a long service life.

[0055] In one specific embodiment of this utility model, the first sealing part 21 and the second sealing part 51 are arranged with equal diameters. Thus, when the second sealing part 51 is sleeved on the airbag 1, the elasticity of the second sealing part 51 is greater than that of the first sealing part 21, thereby further improving the sealing effect.

[0056] Of course, this invention does not limit the thickness of the second sealing part 51. In the embodiments of this invention, the thickness of the second sealing part 51 is D, where 3mm ≤ D ≤ 5mm. This ensures the sealing performance of the second sealing part 51 while improving its structural strength.

[0057] Furthermore, this utility model does not limit the specific structural form of the locking part 52. In one embodiment of this utility model, the locking part 52 can be set as a cable tie. In this way, when the airbag 1 is sleeved on the outside of the welded heat insulation gas cylinder and contacts the first sealing part 21, the second sealing part 51 is sleeved on the airbag 1. The cable tie can fasten and squeeze the second sealing part 51 onto the airbag 1 to increase the pressure between the airbag 1 and the first sealing part 21, thereby enhancing the contact sealing between the two.

[0058] In another embodiment of this utility model, the locking part 52 includes a locking piece 521 and an adjusting part 523. The locking piece 521 is arranged around the periphery of the second sealing part 51, and the two opposite ends of the locking piece 521 are provided with connecting parts 522 protruding in a direction away from the second sealing part 51. The adjusting part 523 is provided to connect the two connecting parts 522 and can adjust the distance between the two connecting parts 522. With this configuration, the locking piece 521 is first arranged around the periphery of the second sealing part 51. Then, the user operates the adjusting part 523 to adjust the distance between the two connecting parts 522, thereby adjusting the inner diameter of the locking piece 521 and adjusting the clamping force of the locking piece 521 on the second sealing part 51.

[0059] In one specific embodiment of this utility model, the locking piece 521 includes a metal piece, the connecting part 522 includes a boss threaded hole, and the adjusting part 523 includes a locking bolt. With this arrangement, when the metal piece is arranged around the periphery of the second sealing part 51, the user can adjust the inner diameter of the metal piece by loosening or tightening the locking bolt, thereby adjusting the pressing force of the metal piece on the second sealing part 51, so as to achieve the purpose of adjusting the locking tightness.

[0060] It should also be noted that when the airbag 1 is fitted onto the welding insulation gas cylinder, since the top of the airbag 1 is not supported and the airbag 1 is deformable, the top of the airbag 1 is prone to collapse, causing the airbag 1 to directly contact the welding insulation gas cylinder. This may result in the welding insulation gas cylinder scratching the airbag 1 and obstructing the gas flow in the internal space of the airbag 1, affecting the flow detection results. Therefore, in one embodiment of this utility model, the airbag 1 is provided with a through hole, which avoids the open end of the airbag 1. The pipe 4 extends into the airbag 1 from the through hole and is fixedly connected to the hole wall of the through hole. The gas leakage detection device 100 of the welding insulation gas cylinder also includes a support structure 6, which is disposed inside the airbag 1 and connected to the pipe 4. The support structure 6 is used to support the welding insulation gas cylinder. With this configuration, when the airbag 1 needs to be fitted onto the welded heat-insulating gas cylinder, the support structure 6 is first supported on the top of the welded heat-insulating gas cylinder. Then, the airbag 1 and the sealing structure 2 are fitted onto the outside of the welded heat-insulating gas cylinder. At this time, the support structure 6 can simultaneously support the airbag 1 and the pipe 4, preventing the top of the airbag 1 from deforming under the pressure of its own weight and the weight of the pipe 4, thus preventing it from contacting the valve and pipeline on the cylinder head of the welded heat-insulating gas cylinder and causing damage to the airbag 1.

[0061] Of course, to ensure the lightweight design of the gas leak detection device 100 for the welded insulated gas cylinder while setting the support structure 6, please refer to [link to relevant documentation]. Figure 3 In a further embodiment of this utility model, the support structure 6 includes multiple support rods 61 and multiple fixing rings 62. One end of each of the multiple support rods 61 is connected to the pipe 4, and the other end is inclined away from each other. The diameters of any two fixing rings 62 are different. Each fixing ring 62 is fixedly connected to multiple support rods 61. The fixing ring 62 away from the pipe 4 is used to abut against the welded insulated gas cylinder. With this configuration, the multiple support rods 61 and the multiple fixing rings 62 form a conical skeleton support structure 6, so as to reduce the weight of the support structure 6 while ensuring the support performance of the support structure 6, thereby reducing the total weight of the gas leak detection device for the welded insulated gas cylinder to less than 3 kg, and thus achieving the lightweighting of the gas leak detection device 100 for the welded insulated gas cylinder.

[0062] It is understood that this utility model does not limit the specific number of the support rods 61. In one embodiment of this utility model, three support rods 61 are provided; in another embodiment of this utility model, four support rods 61 are provided; and in other embodiments of this utility model, the number of support rods 61 can also be set to other numbers, as long as the number of support rods 61 is not less than three, so as to ensure the structural stability and structural strength of the support structure 6. In actual setting, it can be selected according to the needs.

[0063] Similarly, the present invention does not limit the number of fixing rings 62. In one embodiment of the present invention, two fixing rings 62 are provided; in another embodiment of the present invention, three fixing rings 62 are provided; and in other embodiments of the present invention, the number of fixing rings 62 can be set to other numbers. In actual setting, the number can be selected according to the needs.

[0064] In one specific embodiment of this utility model, the number of support rods 61 is set to four, and the number of fixing rings 62 is set to two.

[0065] It should also be noted that, in this embodiment, in order to further ensure the structural strength of the support structure 6, the support rod 61 is welded to the fixing ring 62.

[0066] Furthermore, it should be noted that when the valve of the welding insulation gas cylinder leaks, the gas leaking from the valve first flows into the internal space of the airbag 1. At this time, the gas leaking from the valve of the welding insulation gas cylinder fills the internal space of the airbag 1, causing the airbag 1 to inflate. During the inflation process of the airbag 1, the pressure inside the airbag 1 changes constantly. Therefore, the flow rate detected by the flow detector 3 also changes constantly until the airbag 1 is fully inflated, at which point the pressure inside the airbag 1 tends to stabilize. At the same time, the flow rate detected by the flow detector 3 also gradually stabilizes. Therefore, to further refine the flow detection results, in one embodiment of this utility model, a branch pipe 41 is also provided on the pipeline 4. One end of the branch pipe 41 is connected to the pipeline 4, and the other end is provided with a pressure detector 7. The pressure detector 7 is used to detect the gas pressure inside the branch pipe 41. With this configuration, as the airbag 1 transitions from a flattened state to a stable inflated state, the pressure detector 7 can continuously detect the pressure inside the airbag 1. When the pressure detected by the pressure detector 7 is stable, it indicates that the airbag 1 is fully inflated. At this time, the flow rate from the inside of the airbag 1 to the outside is also stable. The flow detector 3 can detect the flow rate of the gas flowing through it, ensuring that 100% of the leaked gas flows through the flow detector to achieve quantitative detection with an accuracy of ±0.5%FS. Moreover, the measurement time is only 3-8 minutes, resulting in extremely high measurement efficiency.

[0067] It is also understood that by setting the pressure detector 7, the pressure change detected by the pressure detector 7 can be used to infer whether the current leakage of the welding insulation gas cylinder exceeds the maximum range of the flow detector 3. When the pressure on the pressure detector 7 increases too rapidly, it can be determined that the leakage of the welding insulation gas cylinder has exceeded the maximum range of the flow detector 3. At this time, the user can disconnect the gas leakage detection device 100 of the welding insulation gas cylinder from the welding insulation gas cylinder, thereby avoiding damage to the flow detector 3.

[0068] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A gas leak detection device for welded insulated gas cylinders, used to detect leaks in the cylinder head and various pipelines at the cylinder head, characterized in that, include: An airbag, one end of which is open, is used to cover the exterior of the welded insulating gas cylinder and enclose its valve. The airbag is sealed to the welded insulating gas cylinder via a sealing structure. A flow detector, connected to the gas bladder via a pipe, is used to detect the gas flow rate of valve leakage from the welded insulated gas cylinder.

2. The gas leak detection device for welded insulated gas cylinders as described in claim 1, characterized in that, The sealing structure includes a first sealing part, which is elastically arranged and used to be sleeved on the outside of the welded heat-insulating gas cylinder. The outer side of the first sealing part is connected to the air bag.

3. The gas leak detection device for welded insulated gas cylinders as described in claim 2, characterized in that, The gas leak detection device for the welded insulated gas cylinder further includes a locking structure, which is sleeved on the outer side of the gas bag and is provided corresponding to the first sealing part. The locking structure is used to lock the gas bag to the outer side of its first sealing part.

4. The gas leak detection device for welded insulated gas cylinders as described in claim 3, characterized in that, The locking structure includes: The second sealing part is elastically disposed, sleeved on the outer side of the airbag, and corresponding to the first sealing part; and, The locking part is arranged in a ring shape and its inner diameter is adjustable. The locking part is sleeved on the outer side of the second sealing part and is used to lock the airbag to the outside of the welded heat-insulating gas cylinder.

5. The gas leak detection device for welded insulated gas cylinders as described in claim 4, characterized in that, The locking part includes: A locking piece, wherein the locking piece is circumferentially disposed on the periphery of the second sealing portion, and the opposite ends of the locking piece are provided with connecting portions protruding in a direction away from the second sealing portion; and, An adjustment section is provided connecting the two connecting sections, and is capable of adjusting the distance between the two connecting sections.

6. The gas leak detection device for welded insulated gas cylinders as described in claim 4, characterized in that, The first sealing part and the second sealing part are arranged with equal diameter.

7. The gas leak detection device for welded insulated gas cylinders as described in claim 1, characterized in that, The airbag is made of materials including rubber or nylon fabric.

8. The gas leak detection device for welded insulated gas cylinders as described in claim 1, characterized in that, The airbag has a through hole, which is provided to avoid the open end of the airbag; The pipe extends from the through hole into the airbag and is fixedly connected to the wall of the through hole; The gas leak detection device for the welded insulated gas cylinder also includes a support structure, which is located inside the gas bladder and connected to the pipeline. The support structure is used to support the welded insulated gas cylinder.

9. The gas leak detection device for welded insulated gas cylinders as described in claim 8, characterized in that, The supporting structure includes: Multiple support rods, each with one end connected to the pipe and the other end angled away from each other; and... Multiple fixing rings are provided, with any two fixing rings having different diameters. Each fixing ring is fixedly connected to multiple support rods. The fixing ring furthest from the pipeline is used to abut against the welded insulated gas cylinder.

10. The gas leak detection device for welded insulated gas cylinders as described in claim 1, characterized in that, The pipeline is also equipped with a branch pipe, one end of which is connected to the pipeline and the other end is equipped with a pressure detector, which is used to detect the air pressure in the branch pipe.

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