Leak detection device and method for detecting leaks in liquefied gas cylinders

Abstract

This application relates to the technical field of leak detection equipment, and provides a leak detection device and a method for detecting leaks in liquefied gas cylinders. The leak detection device includes a leak detection cover, a detection module, a blowing module, an information reading device, and a controller. The detection module includes a detection device and a sampling tube connected to the detection device. The sampling tube is movably connected to the leak detection cover along the depth direction of the cavity. A part of the sampling tube is located in the cavity and is provided with a sampling port. The blowing module includes a blowing device and a blowing nozzle connected to the blowing device. The information reading device is arranged on the leak detection cover. The controller is electrically connected to the information reading device, the blowing device, and the detection device. The leak detection device provided by the embodiment of this application can achieve the purpose of detecting different types of liquefied gas cylinders for different durations, effectively improving the detection accuracy and effectively reducing the probability of missed detection.

Description

Technical Field

[0001] This application relates to the technical field of leak detection equipment, and in particular provides a leak detection device and a method for detecting leaks in liquefied gas cylinders. Background Art

[0002] Liquefied gas is a clean and efficient energy source.

[0003] However, there are still many safety accidents caused by liquefied gas leakage every year. The main leakage parts of the cylinders are concentrated at the joints of the angle valves and the cylinder valve seats. The traditional detection method takes the same detection time for each cylinder to be detected, that is, the detection time for low-risk cylinders with low usage frequency and high-risk cylinders that have leaked is the same. This will result in insufficient detection of high-risk cylinders and problems such as missed detection. Summary of the Invention

[0004] The purpose of the embodiments of this application is to provide a leak detection device and a method for detecting leaks in liquefied gas cylinders, aiming to solve the problem of easy missed detection caused by the same detection time for each cylinder to be detected in traditional leak detection operations.

[0005] To achieve the above purpose, the technical solution adopted in the embodiments of this application is:

[0006] In a first aspect, the embodiments of this application provide a leak detection device, including a leak detection cover, a detection module, a blowing module, an information reading device, and a controller; a cavity with an opening is formed inside the leak detection cover. The detection module includes a detection device and a sampling tube connected to the detection device. The sampling tube is movably connected to the leak detection cover along the depth direction of the cavity. Part of the sampling tube is located inside the cavity, and sampling ports are provided on the part of the sampling tube located inside the cavity; the blowing module includes a blowing device and a blowing nozzle connected to the blowing device. The blowing nozzle is arranged on the leak detection cover and faces into the cavity; the information reading device is arranged on the leak detection cover, and the controller is electrically connected to the information reading device, the blowing device, and the detection device.

[0007] Advantages of the embodiments of the present application: The leak detection device provided by the embodiments of the present application uses a leak detection cover to cover the angle valve of the liquefied gas cylinder for detection. The information reading device can read the identification information of the detected liquefied gas cylinder to determine the type of the liquefied gas cylinder and send an electrical signal to the controller. Then, the controller can correspondingly control the detection module to perform detection for a corresponding duration, so as to achieve the purpose of performing detection for different durations on different types of liquefied gas cylinders, effectively improving the detection accuracy and effectively reducing the probability of missed detection. And after the detection is completed, the controller can control the blowing module to blow clean air without gas into the cavity to avoid the situation that the internal cavity still has leaked gas and affects the subsequent detection in the case of leakage or when the gas filling site where the device is located has a certain concentration of gas under normal circumstances.

[0008] In some embodiments, the leak detection device further includes a suspension rod with a hollow structure. The suspension rod is arranged on the leak detection cover, and a first connector and a second connector communicating with the hollow structure are arranged on the suspension rod. The first connector is connected to the sampling pipe through a hose structure, and the second connector is used to connect the detection device or the blowing device.

[0009] In some embodiments, the leak detection device further includes a multi-way valve. The first valve port of the multi-way valve is connected to the second connector, the second valve port of the multi-way valve is connected to the detection device, the third valve port of the multi-way valve is used to connect the blowing device, and the fourth valve port of the multi-way valve is connected to the blowing nozzle.

[0010] In some embodiments, the suspension rod is rotatably arranged on the leak detection cover, and a first elastic reset member is further arranged between the suspension rod and the leak detection cover. The first elastic reset member is configured to elastically deform when the suspension rod rotates relative to the leak detection cover.

[0011] In some embodiments, a guide bearing is arranged on the leak detection cover, and the guide bearing is connected to the sampling pipe; a second elastic reset member is arranged on the guide bearing. One end of the second elastic reset member is connected to the fixed part of the guide bearing, and the relatively other end of the second elastic reset member is connected to the sampling pipe.

[0012] In some embodiments, a plurality of guide bearings formed in a ring shape are arranged on the leak detection cover, and the plurality of guide bearings are respectively connected with sampling pipes.

[0013] In some embodiments, a buffer structure is arranged at the end of the sampling pipe.

[0014] In some embodiments, the sampling pipe includes a connecting pipe section and a terminal pipe section located in the cavity and communicating with each other. The extending direction of the connecting pipe section and the extending direction of the terminal pipe section intersect; the sampling port is opened on the connecting pipe section and / or the terminal pipe section.

[0015] In some embodiments, the leak detection device further includes a lifting mechanism, and the output end of the lifting mechanism is connected to the suspension rod.

[0016] In a second aspect, an embodiment of the present application further provides a method for detecting leaks in liquefied gas cylinders, including the leak detection device as described above. The leak detection method includes

[0017] Covering the leak detection cover of the leak detection device at the bottle mouth of the liquefied gas cylinder to be tested;

[0018] The information reading device obtains the information identifier on the liquefied gas cylinder to be tested and determines whether the liquefied gas cylinder to be tested is a low-risk cylinder, a medium-risk cylinder, or a high-risk cylinder;

[0019] When it is determined that the liquefied gas cylinder to be tested is a low-risk cylinder, the detection device performs a routine detection; when it is determined that the liquefied gas cylinder to be tested is a medium-risk cylinder, the detection device performs a precise detection; when it is determined that the liquefied gas cylinder to be tested is a high-risk cylinder, the detection device performs an overtime detection; wherein, the detection time of the precise detection is greater than the detection time of the routine detection, and the detection time of the overtime detection is greater than the detection time of the precise detection.

[0020] The beneficial effects of the embodiments of the present application: The method for detecting leaks in liquefied gas cylinders provided by the embodiments of the present application uses the information reading device of the leak detection device to obtain the information identifier on the liquefied gas cylinder to be tested, so as to determine whether the liquefied gas cylinder is a low-risk cylinder, a medium-risk cylinder, or a high-risk cylinder, and then perform routine detection, precise detection, and overtime detection according to the categories of different liquefied gas cylinders, thereby being able to effectively perform targeted detection on different types of cylinders, and further being able to effectively reduce the probability of missed detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a schematic structural diagram of a leak detection device provided by an embodiment of the present application;

[0023] Figure 2 For Figure 1 The partial enlarged schematic view of part A;

[0024] Figure 3 It is a schematic structural diagram of another perspective of a leak detection device provided by an embodiment of the present application;

[0025] Figure 4Schematic diagram of the internal structure of a leak detection device provided by an embodiment of the present application;

[0026] Figure 5 Schematic diagram of the structure of another leak detection device provided by an embodiment of the present application;

[0027] Figure 6 Schematic diagram of the internal structure of another leak detection device provided by an embodiment of the present application;

[0028] Figure 7 Schematic diagram of the process of a method for detecting leaks in liquefied gas cylinders provided by an embodiment of the present application.

[0029] Among them, each reference numeral in the figure:

[0030] 1000, leak detection device;

[0031] 100, leak detection cover; 101, cavity; 110, air blowing nozzle; 120, mounting post; 130, guiding bearing;

[0032] 200, information reading device;

[0033] 300, sampling tube; 301, sampling port; 310, connecting pipe section; 320, end pipe section;

[0034] 400, hanging rod; 410, first connector; 420, second connector; 430, hanging bar;

[0035] 500, multi-way valve; 510, first valve port; 520, second valve port; 530, third valve port; 540, fourth valve port;

[0036] 600, first elastic reset member;

[0037] 700, second elastic reset member;

[0038] 800, lifting mechanism;

[0039] H, depth direction. Detailed implementation manners

[0040] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present application, and should not be construed as a limitation of the present application.

[0041] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application.

[0042] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.

[0043] In the present application, unless otherwise clearly specified and defined, terms such as "install", "connect", "couple", "fix", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0044] Liquefied gas is a clean and efficient energy source. However, there are still many safety accidents caused by liquefied gas leakage every year. The main leakage parts of the steel cylinders are concentrated at the joints of the angle valves and the valve seats of the steel cylinders. The traditional detection method takes the same detection time for each steel cylinder to be detected, that is, the detection time for low-risk steel cylinders with low usage frequency and high-risk steel cylinders that have had leakage is the same. This will result in insufficient detection of high-risk steel cylinders and problems such as easy omission of detection.

[0045] Based on the above considerations, in order to solve the problem of easy missed detection caused by the same detection time for each cylinder to be detected in traditional leak detection operations, a leak detection device is designed. The leak detection cover is used to cover the angle valve of the liquefied gas cylinder for detection. The information reading device can read the identification information of the detected liquefied gas cylinder to judge the type of the liquefied gas cylinder and send an electrical signal to the controller. Then the controller can correspondingly control the detection module to perform detection for a corresponding duration, so as to achieve the purpose of detecting different types of liquefied gas cylinders for different durations, effectively improving the detection accuracy and effectively reducing the probability of missed detection. And after the detection is completed, the controller can control the blowing module to blow clean air without gas into the cavity to avoid the situation that there is still leaked gas inside the cavity, which affects the subsequent detection, in case of leakage or when there is a certain concentration of gas in the gas filling station where the device is located under normal conditions.

[0046] Next, taking the leak detection device provided by the embodiment of the present application for detecting the connection between the angle valve and the cylinder valve seat of the liquefied gas cylinder as an example, a detailed introduction will be given.

[0047] Please refer to Figures 1 to 6 , in the first aspect, the embodiment of the present application provides a leak detection device 1000, including a leak detection cover 100, a detection module, a blowing module, an information reading device 200 and a controller (not shown in the figure); a cavity 101 with an opening is formed inside the leak detection cover 100. The detection module includes a detection device (not shown in the figure) and a sampling tube 300 connected to the detection device. The sampling tube 300 is movably connected to the leak detection cover 100 along the depth direction H of the cavity 101. A part of the sampling tube 300 is located inside the cavity 101, and a sampling port 301 is provided on the part of the sampling tube 300 located inside the cavity 101. The blowing module includes a blowing device (not shown in the figure) and a blowing nozzle 110 connected to the blowing device. The blowing nozzle 110 is arranged on the leak detection cover 100 and faces into the cavity 101. The information reading device 200 is arranged on the leak detection cover 100, and the controller is electrically connected to the information reading device 200, the blowing device and the detection device.

[0048] Among them, the leak detection cover 100 is used to cover the connection between the angle valve and the cylinder valve seat of the liquefied gas cylinder, so that the connection between the angle valve and the cylinder valve seat of the liquefied gas cylinder extends into the cavity 101 inside the leak detection cover 100. If there is a gas leakage phenomenon in the liquefied gas cylinder, the leaked liquefied gas will disperse in the cavity 101. Therefore, the leak detection cover 100 can effectively reduce the influence of the surrounding air on the leak detection, and the leaked gas can only disperse in a specific area, so that the sampling tube 300 can sample and detect the internal air containing the leaked gas through the sampling port 301.

[0049] Optionally, in some embodiments, the leak detection cover 100 may have a cylindrical structure, and one end of the cylindrical structure forms an opening in the axial direction; during use, the leak detection cover 100 is covered on the liquefied gas cylinder through the opening.

[0050] The detection module is used to sample and detect the gas in the cavity 101; the detection module includes a detection device and a sampling tube 300. The detection device is used to specifically perform the detection and analysis actions, and the sampling tube 300 specifically performs the sampling action.

[0051] The sampling tube 300 is movably connected to the leak detection cover 100 along the depth direction H of the cavity 101. Thus, when the leak detection cover 100 is covered on the liquefied gas cylinder, if the angle valve of the liquefied gas cylinder is on the moving path of the sampling tube 300, the sampling tube 300 will abut against the angle valve of the liquefied gas cylinder. And during the process of the leak detection cover 100 continuing to move and cover the liquefied gas cylinder, the sampling tube 300 is stationary relative to the liquefied gas cylinder, and the sampling tube 300 moves relative to the leak detection cover 100 along the depth direction H of the cavity 101. Thus, the sampling tube 300 will not affect the action of covering the leak detection cover 100 on the liquefied gas cylinder.

[0052] The number of the sampling tubes 300 can be one, two or more; sampling ports 301 are formed on the sampling tube 300. Optionally, the number of the sampling ports 301 can be one, two or any number more than two; the sampling ports 301 can be formed at any position of the part of the sampling tube 300 located inside the leak detection cover 100. It should be understood that the sampling tube 300 is used to connect an external detection device, and the external detection device can obtain the gas in the cavity 101 through the sampling ports 301 of the sampling tube 300, so as to analyze the gas and determine whether there is leaked gas. Or, a gas detection probe for realizing detection can also be directly installed on the sampling tube 300 to directly detect the sampled gas.

[0053] The blowing module is used to blow air into the cavity 101; the blowing module includes a blowing device and a blowing nozzle 110. The blowing device is used to form compressed air so that the air can be introduced into the cavity 101 from the blowing nozzle 110.

[0054] It should be understood that when there is a gas leakage phenomenon in the liquefied gas cylinder, due to the continuous gas leakage of the liquefied gas cylinder, the cavity 101 will be filled with the leaked liquefied gas; under the long-term surrounding action of the liquefied gas, the detection device may age or be damaged, which will affect the service life of the detection device. At the same time, since the cavity 101 is filled with liquefied gas, when the next detection is carried out, the remaining liquefied gas may affect the detection result. Thus, when no detection is carried out, the blowing device can be used to continuously introduce air into the cavity 101 through the blowing nozzle 110 to reduce the influence brought by the leaked liquefied gas.

[0055] The information reading device 200 is used to read the identification information of the detected liquefied gas cylinder. Optionally, the information reading device 200 can be, but is not limited to, a camera, a scanner, or a device for reading and identifying radio frequency identification (RFID) tags. Exemplarily, taking the information reading device 200 as a device for reading and identifying RFID tags as an example, specifically, it can be a ultra-high frequency RFID reader / writer. At the same time, an information tag can be attached to the liquefied gas cylinder, such as an RFID tag, and the information tag can include, but is not limited to, the leak detection time node, the number of leak detections, and the previous leakage conditions of the liquefied gas cylinder, etc. Thus, the ultra-high frequency RFID reader / writer can read the RFID tag on the cylinder from a distance.

[0056] The controller is used to receive the information obtained by the information reading device 200 and determine the category of the liquefied gas cylinder. Among them, the specific way for the controller to receive the information obtained by the information reading device 200 can be to obtain the detailed information of the cylinder from the cloud platform by reading the RFID tag of the cylinder. The detailed information includes, but is not limited to, the file information, distribution information, and historical leak detection data of the cylinder, etc. At the same time, the detection duration and detection result of this time can also be saved to the cloud platform. Any existing cloud platform can be used for the above-mentioned cloud platform to store or read information.

[0057] For example, the category of the liquefied gas cylinder can be judged and divided into low-risk cylinders, medium-risk cylinders, high-risk cylinders, etc. according to the time of the previous leak detection and the number of previous leakages, etc. In some embodiments, cylinders that have not had leakage before and the time of the previous leak detection is relatively recent can be classified as low-risk cylinders, cylinders that have not had leakage before and the time of the previous leak detection is relatively far can be classified as medium-risk cylinders, and cylinders that have had leakage before can be classified as high-risk cylinders.

[0058] The controller can also send electrical signals to the blowing device and the detection device to correspondingly control the blowing device and the detection device to start working. Optionally, the controller can be a single-chip microcomputer, a PLC (programmable logic controller), etc.

[0059] Exemplarily, in some embodiments, the leak detection device can move in the direction of gravity to achieve longitudinal leak detection, specifically as Figures 1 to 4 shown; or, in other embodiments, the leak detection device can move in the horizontal direction to achieve lateral leak detection, specifically as Figure 5 and Figure 6 shown.

[0060] The leak detection device 1000 provided by the embodiment of the present application uses a leak detection cover 100 to cover the angle valve of the liquefied gas cylinder for detection. The information reading device 200 can read the identification information of the detected liquefied gas cylinder to determine the type of the liquefied gas cylinder and send an electrical signal to the controller. Then, the controller can correspondingly control the detection module to perform detection for a corresponding duration, so as to achieve the purpose of performing different-duration detections on different types of liquefied gas cylinders, effectively improving the detection accuracy and effectively reducing the probability of missed detection. And after the detection is completed, the controller can control the blowing module to blow air into the cavity 101 to avoid the situation that the internal cavity 101 still has leaked gas, which affects subsequent detections, in the case of leakage or when there is a certain concentration of gas in the gas filling station where the device is located under normal circumstances.

[0061] Please refer to Figures 1 to 4 , in some embodiments, the leak detection device 1000 further includes a suspension rod 400 with a hollow structure. The suspension rod 400 is arranged on the leak detection cover 100. A first connector 410 and a second connector 420 communicating with the hollow structure are arranged on the suspension rod 400. The first connector 410 is connected to the sampling pipe 300 through a hose structure, and the second connector 420 is used to connect a detection device or a blowing device.

[0062] Among them, the suspension rod 400 can be fixedly connected to the leak detection cover 100; or, the suspension rod 400 can be movably connected to the leak detection cover 100, for example, rotatably connected or slidably connected to the leak detection cover 100.

[0063] The suspension rod 400 has a hollow structure, and a first connector 410 and a second connector 420 are arranged on the suspension rod 400. Thus, when the first connector 410 is connected to the sampling pipe 300 through a hose structure, the gas sampled by the sampling pipe 300 from the sampling port 301 can be introduced into the hollow structure of the suspension rod 400; when the second connector 420 is connected to the detection device, the sampled gas in the hollow structure of the suspension rod 400 can be introduced into the detection device for detection.

[0064] Exemplarily, in some embodiments, the first connector 410 can adopt a thin hose structure, and the second connector 420 can adopt a thick pipe structure for easy connection and use.

[0065] Please refer to Figures 1 to 4 , in some embodiments, the leak detection device 1000 further includes a multi-way valve 500. The first valve port 510 of the multi-way valve 500 is connected to the second connector 420, the second valve port 520 of the multi-way valve 500 is connected to the detection device, the third valve port 530 of the multi-way valve 500 is used to connect a blowing device, and the fourth valve port 540 of the multi-way valve 500 is connected to the blowing nozzle 110.

[0066] With such a setting, the multi-way valve 500 can be operated to open the first valve port 510 and the second valve port 520, while closing the third valve port 530 and the fourth valve port 540. The sampling pipe 300 can sample through the sampling port 301, and the sampled gas can be introduced into the detection device for detection. Alternatively, the multi-way valve 500 can be operated to open the first valve port 510, the second valve port 520, the third valve port 530, and the fourth valve port 540, and at this time, it is in an undetected state; the blowing mechanism can introduce air into the sampling pipe 300 through the third valve port 530 to discharge the residual sampled gas inside the sampling pipe 300; the blowing mechanism can introduce air into the detection device through the second valve port 520 to discharge the sampled gas from the detection device, so as to restore the initial state, and avoid the risk that the detection head is surrounded by the leaked gas contained in the sampled gas for a long time, resulting in a decrease in the sensitivity and aging of the detection head; at the same time, the blowing mechanism can also introduce external air into the blowing nozzle 110 through the fourth valve port 540 to avoid the influence of the residual leaked gas in the detection cavity on the subsequent detection results. In summary, the blowing mechanism can effectively prevent the detection device from continuously inhaling the leaked liquefied gas in the environment, resulting in phenomena such as performance degradation, shortened service life, and false alarms.

[0067] Please refer to Figures 1 to 4 , in some embodiments, the suspension rod 400 is rotatably arranged on the leak detection cover 100, and a first elastic reset member 600 is further arranged between the suspension rod 400 and the leak detection cover 100. The first elastic reset member 600 is configured to elastically deform when the suspension rod 400 rotates relative to the leak detection cover 100.

[0068] Optionally, the first elastic reset member 600 can be but is not limited to a compression spring, a tension spring, a rotational spring, etc. When the suspension rod 400 and the leak detection cover 100 rotate relative to each other, the first elastic reset member 600 will elastically deform. When the external force on the leak detection cover 100 is removed, the first elastic reset member 600 can drive the leak detection cover 100 to return to its original position.

[0069] Exemplarily, in some embodiments, the first elastic reset member 600 is a reset spring. Two mounting posts 120 are fixedly provided on the leak detection cover 100, and the opposite ends of the reset spring are connected to the two mounting posts 120; a hanging rod 430 is fixedly provided on the hanging rod 400, and the hanging rod 430 is connected to the middle of the reset spring. Among them, the two mounting posts 120 can be parallel to the length direction of the hanging rod 400 and are spaced apart on the leak detection cover 100; the opposite ends of the reset spring are connected to the two mounting posts 120 so that the reset spring is suspended between the two mounting posts 120. A hanging rod 430 is also fixedly provided on the hanging rod 400; optionally, the hanging rod 430 can be arranged along a direction perpendicular to the length direction of the hanging rod 400, and the hanging rod 430 is connected to the middle of the reset spring. When the hanging rod 400 rotates relative to the leak detection cover 100, the hanging rod 430 on the hanging rod 400 will move synchronously and drive the reset spring to elastically deform towards one of the mounting posts 120. When the external force acting on the leak detection cover 100 disappears, the reset spring will drive the hanging rod 430 and the hanging rod 400 to move back to the original position according to its own elastic restoring force.

[0070] With such a setting, when the leak detection cover 100 covers the liquefied gas cylinder and the sampling pipe 300 interferes with the angle valve of the liquefied gas cylinder, the leak detection cover 100 can rotate slightly relative to the hanging rod 400, so that the sampling pipe 300 rotates synchronously to avoid the angle valve, so as to reduce the influence of the interference between the sampling pipe 300 and the angle valve.

[0071] Please refer to Figures 1 to 4 , in some embodiments, a guiding bearing 130 is provided on the leak detection cover 100, and the guiding bearing 130 is connected to the sampling pipe 300; a second elastic reset member 700 is provided on the guiding bearing 130, one end of the second elastic reset member 700 is connected to the fixed part of the guiding bearing 130, and the opposite end of the second elastic reset member 700 is connected to the sampling pipe 300.

[0072] The guiding bearing 130 is used to guide the movement of the sampling pipe 300 to ensure its smooth movement along the depth direction H of the cavity 101.

[0073] One or more guiding bearings 130 can be fixedly installed on the leak detection cover 100; the guiding bearing 130 can be arranged inside the cavity 101, or the guiding bearing 130 can be arranged outside the cavity 101, or the guiding bearing 130 can penetrate through the leak detection cover 100 and part of it is located inside the cavity 101 and the other part is located outside the cavity 101.

[0074] The second elastic resetting member 700 is connected to the fixed part of the guiding bearing 130, so that when the sampling tube 300 is relatively displaced from the leak detection cover 100 under an external force, the second elastic resetting member 700 will undergo elastic deformation; when the external force disappears, the second elastic resetting member 700 can drive the sampling tube 300 to move back to its original position for subsequent use.

[0075] Optionally, the second elastic resetting member 700 can be an elastic structure such as a tension spring or a compression spring.

[0076] Please refer to Figures 1 to 4 , in some embodiments, a plurality of guiding bearings 130 forming an annular arrangement are provided on the leak detection cover 100, and a plurality of sampling tubes 300 are respectively connected to the guiding bearings 130.

[0077] It can be understood that the plurality of guiding bearings 130 are annularly arranged on the leak detection cover 100. Thus, when the plurality of sampling tubes 300 are connected to the guiding bearings 130, the plurality of sampling tubes 300 will also be arranged in a ring shape.

[0078] Exemplarily, in some embodiments, the leak detection cover 100 can be a cylindrical cover body structure with one end open, and the plurality of guiding bearings 130 can be annularly arranged around the central axis of the leak detection cover 100. Thus, the plurality of sampling tubes 300 can also be annularly arranged around the central axis of the leak detection cover 100. When the leak detection cover 100 covers the liquefied gas cylinder, the plurality of sampling tubes 300 can be annularly arranged at the angle valve of the liquefied gas cylinder, so that the sampling ports 301 of the plurality of sampling tubes 300 can sample more accurately and the detection effect is more accurate. And when some of the sampling tubes 300 interfere with and abut against the angle valve, these sampling tubes 300 will move relative to the leak detection cover 100 to reduce the influence on the covering action of the leak detection cover 100.

[0079] Please refer to Figures 1 to 4 , in some embodiments, a buffer structure (not shown in the figure) is provided at the end of the sampling tube 300. [[ID=%]]

[0080] Optionally, the buffer structure includes but is not limited to soft structures such as rubber blocks and silica gel blocks.

[0081] With such a setting, when the sampling tube 300 comes into contact with the liquefied gas cylinder, the probability of damage caused by rigid collision between the two can be effectively reduced.

[0082] Please refer to Figures 1 to 4 , in some embodiments, the sampling tube 300 includes a connecting pipe section 310 and a terminal pipe section 320 that are located in the cavity 101 and are connected and communicate with each other; the extending direction of the connecting pipe section 310 and the extending direction of the terminal pipe section 320 intersect; the sampling port 301 is opened on the connecting pipe section 310 and / or the terminal pipe section 320.

[0083] Understandably, the extending direction of the connecting pipe segment 310 intersects with the extending direction of the end pipe segment 320, that is, the end pipe segment 320 can be bent relative to the connecting pipe segment 310. The sampling port 301 can be opened on the connecting pipe segment 310, or the sampling port 301 can be opened on the end pipe segment 320, or the sampling port 301 is opened on both the connecting pipe segment 310 and the end pipe segment 320.

[0084] Exemplarily, in some embodiments, when the number of sampling pipes 300 is multiple, the multiple sampling pipes 300 are arranged in a ring around the central axis of the leak detection cover 100. At this time, the end pipe segments 320 of the multiple sampling pipes 300 can all be offset toward the central axis of the leak detection cover 100, and the sampling port 301 is opened on the end pipe segment 320; thus, the end pipe segment 320 is bent toward the middle relative to the connecting pipe segment 310, and the end pipe segment 320 can be closer to the connection between the angle valve and the cylinder valve seat, that is, the sampling port 301 opened on the end pipe segment 320 can be closer to the possible leakage position, so as to make the detection result more accurate. At the same time, when the end pipe segment 320 forms an interference abutment at the cylinder or the angle valve, the end pipe segment 320 will bend upward and can restore the bending angle under the action of gravity after passing over the interference position.

[0085] Please refer to Figures 1 to 4 , in some embodiments, the leak detection device 1000 further includes a lifting mechanism 800, and the output end of the lifting mechanism 800 is connected to the suspension rod 400.

[0086] Optionally, the lifting mechanism 800 can be but is not limited to a driving structure such as a lifting cylinder or a lifting hydraulic cylinder. With such a setting, the lifting mechanism 800 can be used to drive the suspension rod 400 and the leak detection cover 100 to perform the covering detection operation, thereby improving the automation degree of the leak detection operation.

[0087] Please refer to Figures 1 to 7 , on the second aspect, the embodiment of the present application further provides a method for detecting a leak of a liquefied gas cylinder, including the leak detection device 1000 as described above. The leak detection method includes:

[0088] S100. Cover the leak detection cover 100 of the leak detection device 1000 on the bottle mouth of the liquefied gas cylinder to be detected;

[0089] S200. The information reading device 200 obtains the information identifier on the liquefied gas cylinder to be detected and determines whether the liquefied gas cylinder to be detected is any one of a low-risk cylinder, a medium-risk cylinder, and a high-risk cylinder;

[0090] S300. When it is determined that the liquefied gas cylinder to be tested is a low-risk cylinder, the detection equipment performs a routine test; when it is determined that the liquefied gas cylinder to be tested is a medium-risk cylinder, the detection equipment performs a precise test; when it is determined that the liquefied gas cylinder to be tested is a high-risk cylinder, the detection equipment performs an overtime test; wherein, the detection time of the precise test is greater than that of the routine test, and the detection time of the overtime test is greater than that of the precise test.

[0091] It should be understood that in step S100, the mouth of the liquefied gas cylinder refers to the connection between the angle valve of the liquefied gas cylinder and the cylinder valve seat; the leak detection cover 100 can cover along the height direction of the liquefied gas cylinder and towards the mouth of the liquefied gas cylinder until the connection between the angle valve of the liquefied gas cylinder and the cylinder valve seat extends into the cavity 101 of the leak detection cover 100, and the open end of the leak detection cover 100 can abut against the body of the liquefied gas cylinder. In this way, a relatively independent environment can be maintained inside the cavity 101, and the environmental impact of the external air on the environment inside the cavity 101 can be effectively reduced.

[0092] In step S200, the information reading device 200 can be, but is not limited to, a camera, a scanner, or a device for reading and identifying radio frequency identification tags. Exemplarily, taking the information reading device 200 as a device for reading and identifying radio frequency identification tags as an example, an information tag can be affixed to the liquefied gas cylinder, and the information tag can include, but is not limited to, the leak detection time node, the number of leak detections, and the previous leakage situation of the liquefied gas cylinder.

[0093] Optionally, the information reading device 200 can be installed on the side of the leak detection cover 100 inside the cavity 101, and the information tag affixed to the liquefied gas cylinder can be affixed near the mouth of the cylinder; in this way, when the leak detection cover 100 covers the mouth of the liquefied gas cylinder, the information reading device 200 can read the content of the information tag to determine the category of the liquefied gas cylinder.

[0094] The liquefied gas cylinders include three categories: low-risk cylinders, medium-risk cylinders, and high-risk cylinders; the category of the liquefied gas cylinder can be determined according to the content of the information tag. Among them, the content of the information tag can include, but is not limited to, the leak detection time node, the number of leak detections, and the previous leakage situation of the liquefied gas cylinder.

[0095] Exemplarily, in some embodiments, cylinders that have not had leakage situations in the past and whose last leak detection time is relatively recent can be classified as low-risk cylinders, cylinders that have not had leakage situations in the past and whose last leak detection time is relatively far can be classified as medium-risk cylinders, and cylinders that have had leakage situations in the past can be classified as high-risk cylinders.

[0096] Alternatively, in some other embodiments, the different risk levels of the gas cylinders can also be classified according to the historical inspection records of the gas cylinders, the suppliers of the gas cylinders, the service life of the gas cylinders, and the production batches of the gas cylinders, etc. Among them, the specific classification conditions can be customized according to actual needs.

[0097] It should be understood that the above exemplary description is for the purpose of facilitating the understanding of how to classify; the specific classification and judgment method of the liquefied gas cylinders can also be any other conditions, which can be specifically set according to requirements.

[0098] In step S300, routine inspections are performed on low-risk gas cylinders, precise inspections are performed on medium-risk gas cylinders, and overtime inspections are performed on high-risk gas cylinders.

[0099] Among them, the inspection time of the overtime inspection is longer than that of the precise inspection, and the inspection time of the precise inspection is longer than that of the routine inspection. That is, the routine inspection is a fast inspection mode, and the gas cylinders with relatively low risk types can be quickly inspected to improve the inspection efficiency. Exemplarily, the inspection time of the routine inspection can be but is not limited to about 4 seconds to 6 seconds. The precise inspection is a time-consuming inspection mode, and a more comprehensive inspection is performed on the gas cylinders with certain risks to avoid missed inspections. Exemplarily, the inspection time of the precise inspection can be but is not limited to about 9 seconds. The overtime inspection is the inspection mode with the longest time, which is used to perform a more sufficient inspection on the gas cylinders with higher air leakage risks to further reduce the probability of missed inspections. Exemplarily, the inspection time of the overtime inspection can be but is not limited to about 9 seconds to 12 seconds.

[0100] The above are only the preferred embodiments of the present application, and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A leak detection device, characterized in that: including a leak detection cover, inside which a cavity with an opening is formed; a detection module, which includes a detection device and a sampling pipe connected to the detection device. The sampling pipe is movably connected to the leak detection cover along the depth direction of the cavity. A part of the sampling pipe is located inside the cavity, and sampling ports are provided on the part of the sampling pipe located inside the cavity. The sampling pipe includes a connecting pipe section and a terminal pipe section that are located inside the cavity and communicate with each other. The extending direction of the connecting pipe section intersects with the extending direction of the terminal pipe section, and the terminal pipe section is offset toward the central axis of the leak detection cover. The sampling ports are provided on the terminal pipe section; a blowing module, which includes a blowing device and a blowing nozzle connected to the blowing device. The blowing nozzle is arranged on the leak detection cover and faces inside the cavity; an information reading device, which is arranged on the leak detection cover and is used to read the detailed information of the gas cylinder. The detailed information includes the file information, distribution information, and historical leak detection data of the gas cylinder; and a controller, which is electrically connected to the information reading device, the blowing device, and the detection device. The controller is configured to be able to control the detection duration of the detection device.

2. The leak detection device according to claim 1, characterized in that: The leak detection device further includes a hanging rod with a hollow structure. The hanging rod is arranged on the leak detection cover. A first connection head and a second connection head communicating with the hollow structure are provided on the hanging rod. The first connection head communicates with the sampling pipe through a hose structure, and the second connection head is used to connect the detection device or the blowing device.

3. The leak detection device according to claim 2, wherein: The leak detection device further includes a multi-way valve. The first valve port of the multi-way valve communicates with the second connection head. The second valve port of the multi-way valve is connected to the detection device. The third valve port of the multi-way valve is used to connect the blowing device. The fourth valve port of the multi-way valve communicates with the blowing nozzle.

4. The leak detection device according to claim 2 or 3, characterized in that: The hanging rod is rotatably arranged on the leak detection cover, and a first elastic resetting member is further arranged between the hanging rod and the leak detection cover. The first elastic resetting member is configured to elastically deform when the hanging rod rotates relative to the leak detection cover.

5. The leak detection device according to claim 4, characterized in that: A guiding bearing is arranged on the leak detection cover and is connected to the sampling pipe. A second elastic resetting member is arranged on the guiding bearing. One end of the second elastic resetting member is connected to the fixed part of the guiding bearing, and the opposite end of the second elastic resetting member is connected to the sampling pipe.

6. The leak detection device according to claim 5, characterized in that: A plurality of guiding bearings are arranged on the leak detection cover in a ring shape, and the plurality of guiding bearings are respectively connected to the sampling pipe.

7. The leak detection device according to claim 6, characterized in that: A buffer structure is arranged at the end of the sampling pipe.

8. The leak detection device according to any one of claims 5 to 7, characterized in that: The leak detection device further includes a lifting mechanism, and the output end of the lifting mechanism is connected to the hanging rod.

9. A method for detecting leaks in liquefied gas cylinders, characterized in that: including the leak detection device according to any one of claims 1 to 8, the leak detection method includes covering the leak detection cover of the leak detection device on the bottle mouth of the liquefied gas cylinder to be detected; the information reading device obtains the information identifier on the liquefied gas cylinder to be detected and determines whether the liquefied gas cylinder to be detected is a low-risk gas cylinder, a medium-risk gas cylinder, or a high-risk gas cylinder; When it is determined that the liquefied gas cylinder to be tested is a low-risk cylinder, the detection device performs a routine detection; when it is determined that the liquefied gas cylinder to be tested is a medium-risk cylinder, the detection device performs a precise detection; when it is determined that the liquefied gas cylinder to be tested is a high-risk cylinder, the detection device performs an overtime detection; wherein, the detection time of the precise detection is greater than the detection time of the routine detection, and the detection time of the overtime detection is greater than the detection time of the precise detection.

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