Gas leakage detection device

Abstract

An exemplary gas leak detection device includes: a tip head portion having a spherical shape; a tip connection portion configured to communicate with the tip head portion and connectable to a hydrogen detection line; a reference detection hole provided at an end of the tip head portion with respect to a longitudinal direction of the tip connection portion; and a peripheral detection hole provided in the tip portion and spaced apart from the reference detection hole, and pointing in a direction intersecting the reference detection hole.

Description

[0001] Cross - reference to related applications

[0002] This application claims the benefit of Korean Patent Application No. 10 - 2023 - 0177102, filed on December 7, 2023, which is incorporated herein by reference. Technical field

[0003] The present disclosure relates to a gas leakage detection device. Background art

[0004] A fuel cell electric vehicle (FCEV) generates electric power through an electrochemical reaction between oxygen and hydrogen in a fuel cell stack and travels by operating a motor.

[0005] A fuel cell electric vehicle can continuously generate electricity by supplying fuel (hydrogen) and air from the outside, regardless of the capacity of the battery, and thus has high efficiency and emits almost no pollutants. Due to these advantages, continuous research and development have been conducted on fuel cell electric vehicles.

[0006] Generally, a fuel cell electric vehicle may include: a fuel cell stack configured to generate electricity through an oxidation - reduction reaction between hydrogen and oxygen; a fuel supply device configured to supply fuel (hydrogen) to the fuel cell stack; and an air supply device configured to supply reaction air (oxygen), which is an oxidant required for the electrochemical reaction, to the fuel cell stack.

[0007] Meanwhile, the sealing performance of connection parts (e.g., regulators, hydrogen cut - off valves, hydrogen supply valves, and fittings for pipes) in a hydrogen supply pipeline for supplying hydrogen in a fuel cell electric vehicle is one of the most important performances related to the safety of the hydrogen supply system (and specifically, the safety of the entire fuel cell system).

[0008] Specifically, when hydrogen leaks from a connection part in the hydrogen supply pipeline, secondary damages such as fire may occur.

[0009] When hydrogen leaks from a connection part in the hydrogen supply pipeline, the risk of a safety accident increases. Therefore, it is necessary to accurately detect whether hydrogen leaks.

[0010] Therefore, in the related art, a method for detecting hydrogen leakage has been proposed by allowing a detection end to approach an inspection site (a site where hydrogen leakage is expected), and the detection end has a substantially tubular shape and is provided at the end of a hydrogen detector.

[0011] In order to improve the accuracy of hydrogen leakage inspection performed by a hydrogen detector, the detection end needs to approach the inspection site (set at the inspection site) in an accurate posture (angle and distance). However, since hydrogen has the characteristics of low gas density and being colorless, odorless, and tasteless, it is difficult for an operator to accurately identify the hydrogen leakage point, making it difficult to allow the detection end to approach the inspection site in an accurate posture (angle and distance). In addition, there is a problem that the deviation of the accuracy of hydrogen leakage inspection varies greatly depending on the experience and ability of the operator.

[0012] In addition, in the related art, since the leakage rate of hydrogen detected by a hydrogen detector varies according to the posture of the detection end relative to the inspection site, there is a problem that it is difficult to quantify the inspection result.

[0013] Therefore, in recent years, in order to simplify the hydrogen leakage detection process and improve the accuracy of hydrogen leakage inspection, various studies have been carried out, but the research results are still insufficient. Therefore, it is necessary to develop a technology that simplifies the hydrogen leakage detection process and improves the accuracy of hydrogen leakage inspection. Summary of the Invention

[0014] The present disclosure relates to a gas leakage detection device. Multiple specific embodiments relate to a gas leakage detection device that can improve the accuracy of hydrogen leakage inspection and improve safety and reliability.

[0015] Embodiments of the present disclosure can provide a gas leakage detection device that can improve the accuracy of hydrogen leakage inspection and improve safety and reliability.

[0016] Specifically, embodiments of the present disclosure can minimize the deviation of the accuracy of hydrogen leakage inspection, which varies according to the experience and ability of the operator, and can easily and accurately detect whether hydrogen leaks.

[0017] In addition to this, embodiments of the present disclosure can accurately perform hydrogen leakage inspection without being significantly affected by the posture (angle and distance) of the detection end relative to the inspection site.

[0018] Embodiments of the present disclosure can simplify the hydrogen leakage inspection process and shorten the time required for the inspection process.

[0019] Embodiments of the present disclosure can minimize errors in hydrogen leakage inspection and quantify the results of hydrogen leakage inspection.

[0020] Features that can be achieved by the embodiments are not limited to the above features, but the embodiments also include other features or effects that can be understood from the solutions or embodiments described below.

[0021] Embodiments of the present disclosure provide a gas leakage detection device, which includes: a distal head portion having a spherical shape; a distal connection portion configured to communicate with the distal head portion and connected to a hydrogen detection pipeline; a reference detection hole provided at an end portion of the distal head portion in a longitudinal direction based on the distal connection portion; and a peripheral detection hole provided in the distal head portion and spaced apart from the reference detection hole and pointing in a direction intersecting the reference detection hole.

[0022] This can improve the accuracy of hydrogen leakage inspection and enhance safety and reliability.

[0023] That is, in order to improve the accuracy of hydrogen leakage inspection performed by a hydrogen detector, the detection end needs to approach the inspection site (provided at the inspection site) in an accurate posture (angle and distance). However, due to the characteristics of hydrogen having a low gas density and being colorless and odorless, it is difficult for an operator to accurately identify the hydrogen leakage point, which makes it difficult to allow the detection end to approach the inspection site in an accurate posture (angle and distance). In addition, there is a problem that the deviation of the accuracy of hydrogen leakage inspection varies greatly depending on the experience and ability of the operator.

[0024] In addition, in the related art, since the leakage rate of hydrogen detected by a hydrogen detector varies according to the posture of the detection end relative to the inspection site, there is a problem that it is difficult to quantify the inspection result.

[0025] On the contrary, in the embodiments of the present disclosure, since the peripheral detection hole and the reference detection hole are provided in the distal head portion together, the effective detection area (hydrogen leakage detection area) of the distal head portion can be further expanded. Therefore, the advantageous effects of improving the accuracy of hydrogen leakage inspection and enhancing safety and reliability can be obtained.

[0026] Specifically, in the embodiments of the present disclosure, since the peripheral detection holes are arranged around the reference detection hole, the advantageous effect of minimizing the deviation of the accuracy of hydrogen leakage inspection (the deviation varies according to the experience and ability of the operator) can be obtained, and it is easy and accurate to detect whether hydrogen leaks.

[0027] In addition, in the embodiments of the present disclosure, even in a state where the reference detection hole does not exactly coincide with the leakage point, the leakage of hydrogen can be detected through the reference detection hole and the peripheral detection holes. In addition, hydrogen leakage inspection can be accurately performed without being greatly affected by the posture (angle and distance) of the detection end relative to the inspection site.

[0028] According to an exemplary embodiment of the present disclosure, the center of the peripheral detection hole may be defined as being located on a first reference line, which is defined as being inclined at a preset first reference angle with respect to a center line passing through the center of the distal head portion and the center of the reference detection hole.

[0029] The first reference angle can vary in various ways according to the required conditions and design specifications. According to an exemplary embodiment of the present disclosure, the first reference angle can be defined as 45 degrees or less. Specifically, the first reference angle can be defined as 30 degrees.

[0030] The number of peripheral detection holes and the arrangement pattern of the peripheral detection holes can vary in various ways according to the required conditions and design specifications.

[0031] According to an exemplary embodiment of the present disclosure, the peripheral detection holes are provided as a plurality of peripheral detection holes spaced apart from each other in the circumferential direction based on the center line (relative to the reference detection hole).

[0032] According to an exemplary embodiment of the present disclosure, the end head portion can be defined as having a diameter of 20 mm and a thickness of 2 mm. The diameter of each of the reference detection hole and the peripheral detection holes can be defined as 4 mm, and the peripheral detection holes can be provided as seven peripheral detection holes spaced apart from each other at equal intervals in the circumferential direction based on the center line.

[0033] According to an exemplary embodiment of the present disclosure, the reference detection hole and the peripheral detection holes can be defined as being located in an end detection region defined at the end portion of the end head portion in the longitudinal direction based on the end connection portion.

[0034] According to an exemplary embodiment of the present disclosure, the end detection region can be defined as 15% or less of the total area of the end head portion.

[0035] According to an exemplary embodiment of the present disclosure, the sum of the opening areas of the reference detection hole and the peripheral detection holes can be defined as 55% or more of the area of the end detection region.

[0036] According to an exemplary embodiment of the present disclosure, the gas leakage detection device can include side detection holes provided in the end head portion and located between the peripheral detection holes and the end connection portion.

[0037] This is to detect and determine whether hydrogen leaks from the detection target (hydrogen leakage site) (to measure the gas leakage value) even in a state where the end detection region of the end head portion in which the reference detection hole and the peripheral detection holes are provided is not set (aligned) in an attitude facing the detection target.

[0038] That is, in the case where the reference detection hole and the peripheral detection holes are only provided in the end detection region of the end head portion, there is a problem that it is difficult to detect hydrogen leakage at the lateral portion or the rear portion of the end head portion (the lateral portion or the rear portion of the end head portion relative to the end in the longitudinal direction of the end head portion based on the end connection portion).

[0039] In contrast, in the embodiments of the present disclosure, since the side detection holes are provided between the peripheral detection holes and the end connection portion, even if the end detection region of the end head portion is not accurately aligned with the detection target (the direction of hydrogen leakage from the detection target is not consistent with the reference detection hole), it is possible to detect whether hydrogen leaks from the detection target based on the hydrogen introduced into the side detection holes at the side portion or the rear portion of the end head portion.

[0040] According to the required conditions and design specifications, the side detection holes can have various structures.

[0041] According to an exemplary embodiment of the present disclosure, the side detection holes can include: a first side hole provided between the peripheral detection holes and the end connection portion; and a second side hole provided between the first side hole and the end connection portion and spaced apart from the first side hole.

[0042] According to an exemplary embodiment of the present disclosure, the center of the first side hole can be defined as being located on a second reference line, which is defined as being inclined at a preset second reference angle with respect to the center line passing through the center of the end head portion and the center of the reference detection hole, and the center of the second side hole can be defined as being located on a third reference line, which is defined as being inclined at a preset third reference angle with respect to the center line passing through the center of the end head portion and the center of the reference detection hole.

[0043] The second reference angle and the third reference angle can vary in various ways according to the required conditions and design specifications.

[0044] According to an exemplary embodiment of the present disclosure, the second reference angle can be defined as 90 degrees, and the third reference angle can be defined as 120 degrees.

[0045] According to the required conditions and design specifications, the first side hole and the second side hole can vary in terms of the number and arrangement.

[0046] According to an exemplary embodiment of the present disclosure, the end head portion can be defined as having a diameter of 20 mm and a thickness of 2 mm. The diameter of each of the first side hole and the second side hole can be defined as 4 mm. The first side holes can be provided as four first side holes spaced apart from each other at equal intervals in the circumferential direction based on the center line, and the second side holes can be provided as three second side holes spaced apart from each other at equal intervals in the circumferential direction based on the center line.

[0047] The ratio of the sum of the opening areas of the reference detection hole, the peripheral detection holes, and the side detection holes to the total area of the end head portion (the total outer surface area of the end head portion) can be changed in various ways according to the required conditions and design specifications.

[0048] According to an exemplary embodiment of the present disclosure, the sum of the opening areas of the reference detection hole, the peripheral detection holes, and the side detection holes may be defined to be less than 15% of the total area of the end head portion.

[0049] This is based on the fact that when the sum of the opening areas of the reference detection hole, the peripheral detection holes, and the side detection holes is equal to or greater than 15% of the total area of the end head portion, the measurement dispersion related to the hydrogen leakage rate (gas leakage value) becomes large due to external influences (e.g., external air), which reduces the detection accuracy. According to an embodiment of the present disclosure, since the sum of the opening areas of the reference detection hole, the peripheral detection holes, and the side detection holes is defined to be less than 15% of the total area of the end head portion, an advantageous effect of reducing the measurement dispersion related to the hydrogen leakage rate (gas leakage value) caused by external influences and improving the detection accuracy can be obtained.

[0050] In particular, the sum of the opening areas of the reference detection hole, the peripheral detection holes, and the side detection holes may be defined to be 14% of the total area of the end head portion.

[0051] According to an exemplary embodiment of the present disclosure, a negative pressure may be applied to the hydrogen detection pipeline, and a suction pressure may be applied to the reference detection hole, the peripheral detection holes, and the side detection holes on the basis of this negative pressure.

[0052] The suction rate (the suction rate achieved by the suction pressure) passing through the reference detection hole, the peripheral detection holes, and the side detection holes may be variously changed according to the required conditions and design specifications.

[0053] According to an exemplary embodiment of the present disclosure, the suction rate passing through the reference detection hole, the peripheral detection holes, and the side detection holes may be defined to be 3000 sccm. Description of the Drawings

[0054] Figure 1 is a view for explaining a gas leakage detection device according to an embodiment of the present disclosure.

[0055] Figure 2 is a view for explaining the end head portion and the end connection portion of a gas leakage detection device according to an embodiment of the present disclosure.

[0056] Figures 3 to 5 is a view for explaining the reference detection hole, the peripheral detection holes, and the side detection holes of a gas leakage detection device according to an embodiment of the present disclosure.

[0057] Figure 6 is a view for explaining Comparative Example 1 of a gas leakage detection device according to an embodiment of the present disclosure.

[0058] Figure 7 It is a view for illustrating Comparative Example 2 of the gas leakage detection device according to an embodiment of the present disclosure.

[0059] Figure 8 It is a view for illustrating Comparative Example 3 of the gas leakage detection device according to an embodiment of the present disclosure.

[0060] Figure 9 It is a view for illustrating Comparative Example 4 of the gas leakage detection device according to an embodiment of the present disclosure.

[0061] Figure 10 It is a view for illustrating the gas leakage values of multiple comparative examples according to the number and size of the detection holes.

[0062] Figure 11 It is a view for illustrating the gas leakage rates of multiple comparative examples according to the number and size of the detection holes.

[0063] Figure 12 It is a view for illustrating the gas leakage rate of an embodiment of the present disclosure according to the detection angle relative to the leakage point.

[0064] Figure 13 It is a view for illustrating the gas leakage rate of an embodiment of the present disclosure according to the number of detection holes under low suction rate conditions.

[0065] Figure 14 It is a view for illustrating the gas leakage rates of comparative examples according to the size of the detection holes under low suction rate conditions and high suction rate conditions.

[0066] Figure 15 It is a view for illustrating the gas leakage rate of an embodiment of the present disclosure according to the suction rate. Detailed Embodiments

[0067] Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0068] However, the technical spirit of the present disclosure is not limited to the embodiments described herein, but can be implemented in various different forms. Within the scope of the technical spirit of the present disclosure, one or more constituent elements in the embodiments can be selectively combined and replaced.

[0069] In addition, unless otherwise clearly and precisely defined and stated, the terms (including technical terms and scientific terms) used in the embodiments of the present disclosure can be interpreted as having the meanings commonly understood by those of ordinary skill in the art to which the present disclosure pertains. The meanings of common terms such as those defined in a dictionary can be interpreted in consideration of the contextual meanings of the related art.

[0070] In addition, the terms used in the embodiments of the present disclosure are used to explain the embodiments and are not used to limit the present disclosure.

[0071] In this specification, unless otherwise specifically stated, the singular form may also include the plural form. The expression “at least one (or one or more) of A, B, and C” may include one or more of all combinations that can be made by combining A, B, and C.

[0072] In addition, terms such as first, second, A, B, (a), and (b) may be used to describe the components of the embodiments of the present disclosure.

[0073] These terms are only used for the purpose of distinguishing one component from another, and the nature, sequence, or order of the components are not limited by these terms.

[0074] In addition, when one component is described as “connected,” “coupled,” or “attached” to another component, this one component may be directly connected, coupled, or attached to the other component, or may be connected, coupled, or attached to the other component through yet another intervening component.

[0075] In addition, the expression “one component is disposed or arranged above (or on) or below (or under) another component” includes not only the case where the two components are in direct contact with each other, but also the case where one or more other components are disposed or arranged between the two components. The expression “above (or on) or below (or under)” may indicate the downward direction and the upward direction based on one component.

[0076] Referring Figures 1 to 15 , according to an embodiment of the present disclosure, the gas leakage detection device 10 includes: a terminal head portion 110 having a spherical shape; a terminal connection portion 120 configured to communicate with the terminal head portion 110 and connected to the hydrogen detection pipeline 30; a reference detection hole 210 provided at an end of the terminal head portion 110 in the longitudinal direction based on the terminal connection portion 120; and a peripheral detection hole 220 provided in the terminal head portion 110 and spaced apart from the reference detection hole 210 and pointing in a direction intersecting the reference detection hole 210.

[0077] As a reference, the gas leakage detection device 10 according to an embodiment of the present disclosure can detect gas leakage. The embodiments of the present disclosure are not limited or restricted by the type and characteristics of the gas detected by the gas leakage detection device 10.

[0078] Hereinafter, an example in which hydrogen leakage from a connection portion of a hydrogen supply pipeline 20 (through which hydrogen is supplied) is detected using the gas leakage detection device 10 according to an embodiment of the present disclosure will be described.

[0079] The end head portion 110 and the end connection portion 120 together constitute the detection end 100. Hydrogen introduced into the end head portion 110 can be introduced into the hydrogen detection portion 40 along a hydrogen detection pipeline 30 connected to an end of the end connection portion 120. The hydrogen detection portion 40 can determine whether hydrogen is leaking based on the amount of hydrogen introduced.

[0080] Various hydrogen detection sensors capable of detecting hydrogen can be used as the hydrogen detection portion 40. The embodiments of the present disclosure are not limited or restricted by the type and structure of the hydrogen detection sensor.

[0081] For example, a semiconductor element sensor, a ceramic sensor, an electrochemical sensor, an optical sensor, etc. can be used as the hydrogen detection sensor.

[0082] The end head portion 110 is configured to be in direct contact with the detection target (hydrogen leakage site).

[0083] The end head portion 110 has a hollow spherical shape (spherical). The embodiments of the present disclosure are not limited or restricted by the size (diameter and thickness) D1 of the end head portion 110.

[0084] According to an exemplary embodiment of the present disclosure, the diameter D1 of the end head portion 110 can be defined as 20 mm, and the thickness T of the end head portion 110 can be defined as 2 mm. According to another embodiment of the present disclosure, the diameter of the end head portion can be less than or greater than 20 mm, and the thickness of the end head portion can be less than or greater than 2 mm.

[0085] The end connection portion 120 communicates with the end head portion 110, and the hydrogen detection pipeline 30 is connected to one end of the end connection portion 120.

[0086] The end connection portion 120 can have various structures capable of communicating with the end head portion 110. The embodiments of the present disclosure are not limited or restricted by the structure of the end connection portion 120.

[0087] For example, the end connection portion 120 may have a generally hollow cylindrical shape. The end connection portion 120 is received in a fastening hole (not shown) provided in the end head portion 110 such that the end connection portion 120 can be connected to the end head portion 110 while being in communication with the end head portion 110.

[0088] In the embodiments of the present disclosure shown and described above, an example is described in which the end connection portion 120 is directly connected to the end head portion 110. However, according to another embodiment of the present disclosure, the end connection portion may be connected to the end head portion through a separate adapter. Alternatively, the end connection portion may be threadedly fastened to the end head portion. Alternatively, the end connection portion may be fastened to the end head portion through a separate clip or fastening member.

[0089] The reference detection hole 210 may be provided at the distal end of the end head portion 110 in the longitudinal direction based on the end connection portion 120. Hydrogen leaking from the detection target (hydrogen leakage site) can be introduced into the end head portion 110 through the reference detection hole 210.

[0090] For example, the center of the reference detection hole 210 is located on the center line CL passing through the center of the end connection portion 120 and the center of the end head portion 110.

[0091] The reference detection hole 210 may have various structures according to the required conditions and design specifications. The embodiments of the present disclosure are not limited or restricted by the structure and shape of the reference detection hole 210.

[0092] For example, the reference detection hole 210 may be provided in the form of a circular hole. Alternatively, the reference detection hole 210 may have a quadrilateral shape, an elliptical shape, or other shapes.

[0093] The size (diameter) D2 of the reference detection hole 210 may be variously changed according to the required conditions and design specifications. The embodiments of the present disclosure are not limited or restricted by the size of the reference detection hole 210.

[0094] According to an exemplary embodiment of the present disclosure, the diameter D2 of the reference detection hole 210 may be defined as 4 mm. According to another embodiment of the present disclosure, the diameter of the reference detection hole may be less than 4 mm or greater than 4 mm.

[0095] The peripheral detection holes 220 are provided around the end head portion 110 and spaced apart from the reference detection hole 210, and are directed in a direction intersecting the reference detection hole 210. Hydrogen leaking from the detection target (hydrogen leakage site) can be introduced into the end head portion 110 through the peripheral detection holes 220.

[0096] Based on the hydrogen introduced through the reference detection hole 210 and the peripheral detection holes 220, the leakage rate of hydrogen from the detection target can be substantially determined.

[0097] As described above, in the embodiments of the present disclosure, the leakage rate of hydrogen from the detection target is detected based on the hydrogen introduced through the reference detection hole 210 and the hydrogen introduced through the peripheral detection holes 220, so that the effective detection area (hydrogen leakage detection area) of the end head portion 110 can be further expanded. Therefore, the advantageous effects of improving the accuracy of hydrogen leakage inspection and enhancing safety and reliability can be obtained.

[0098] Specifically, in the embodiments of the present disclosure, even in a state where the reference detection hole 210 does not exactly coincide with the leakage point, the leakage of hydrogen can be detected through the reference detection hole 210 and the peripheral detection holes 220. Therefore, the deviation in the accuracy of hydrogen leakage inspection that varies according to the experience and ability of the operator can be minimized. In addition, hydrogen leakage inspection can be accurately performed without being greatly affected by the attitude (angle and distance) of the detection end 100 relative to the inspection site.

[0099] In addition, in the embodiments of the present disclosure, the hydrogen leaking from the detection target is separated and introduced into the reference detection hole 210 and the peripheral detection holes 220. Therefore, the advantageous effects of minimizing the dispersion of gas leakage values and standardizing (quantifying) the measured values can be obtained.

[0100] The peripheral detection holes 220 can have various structures according to the required conditions and design specifications. The embodiments of the present disclosure are not limited or restricted by the structure and shape of the peripheral detection holes 220.

[0101] For example, the peripheral detection holes 220 can be provided in the form of circular holes. Alternatively, the peripheral detection holes 220 can have a quadrilateral shape, an elliptical shape, or other shapes.

[0102] The size (diameter) of the peripheral detection holes 220 can vary in various ways according to the required conditions and design specifications. The embodiments of the present disclosure are not limited or restricted by the size of the peripheral detection holes 220.

[0103] According to an exemplary embodiment of the present disclosure, the diameter of the peripheral detection holes 220 can be defined as 4 mm. According to another embodiment of the present disclosure, the diameter of the peripheral detection holes can be less than 4 mm or greater than 4 mm.

[0104] According to an exemplary embodiment of the present disclosure, the center of the peripheral detection holes 220 can be located on the first reference line SL1, which is inclined at a preset first reference angle θ1 with respect to the center line CL passing through the center of the end head portion 110 and the center of the reference detection hole 210.

[0105] The first reference angle θ1 can vary in various ways according to the required conditions and design specifications. Embodiments of the present disclosure are not limited or restricted by the magnitude of the first reference angle θ1.

[0106] According to an exemplary embodiment of the present disclosure, the first reference angle θ1 can be defined as 45 degrees or less. Specifically, the first reference angle θ1 can be defined as 30 degrees.

[0107] The peripheral detection holes 220 can vary in number and arrangement according to the required conditions and design specifications. Embodiments of the present disclosure are not limited or restricted by the number and arrangement of the peripheral detection holes 220.

[0108] According to an exemplary embodiment of the present disclosure, a plurality of peripheral detection holes 220 can be arranged radially and spaced apart from each other in the circumferential direction based on the center line CL (relative to the reference detection hole 210).

[0109] Specifically, seven peripheral detection holes 220 can be arranged to be spaced apart from each other at equal intervals in the circumferential direction based on the center line CL.

[0110] According to another embodiment of the present disclosure, the number of peripheral detection holes can be defined as less than seven or equal to or greater than eight.

[0111] According to an exemplary embodiment of the present disclosure, the reference detection hole 210 and the peripheral detection holes 220 can be located in a terminal detection region FDZ, which is defined at the terminal portion of the terminal head portion 110 in the longitudinal direction based on the terminal connection portion 120.

[0112] The terminal detection region FDZ can be defined in various shapes according to the required conditions and design specifications. Embodiments of the present disclosure are not limited or restricted by the shape of the terminal detection region FDZ.

[0113] For example, the terminal detection region FDZ can be defined as a substantially dome shape.

[0114] In particular, the center of the dome of the terminal detection region FDZ can be defined as coinciding with the center of the reference detection hole 210.

[0115] According to an exemplary embodiment of the present disclosure, the terminal detection region FDZ can be defined as 15% or less of the total area of the terminal head portion 110 (the total outer surface area of the terminal head portion 110). Specifically, the terminal detection region FDZ can be defined as 12.3% of the total area of the terminal head portion 110 (the total outer surface area of the terminal head portion 110).

[0116] According to an exemplary embodiment of the present disclosure, the sum of the opening areas of the reference detection holes 210 and the peripheral detection holes 220 (e.g., the sum of the opening area of one reference detection hole and the opening areas of six peripheral detection holes) may be defined as 55% or more of the area of the end detection region FDZ.

[0117] Specifically, the sum of the opening areas of the reference detection holes 210 and the peripheral detection holes 220 may be defined as 57.1% of the area of the end detection region FDZ.

[0118] According to an exemplary embodiment of the present disclosure, the gas leakage detection device 10 may include side detection holes 230 provided in the end head portion 110 and located between the peripheral detection holes 220 and the end connection portion 120.

[0119] The side detection holes 230 are provided such that even when the end detection region FDZ of the end head portion 110 in which the reference detection holes 210 and the peripheral detection holes 220 are provided is not arranged (aligned) in a posture facing the detection target, it is possible to detect and determine whether hydrogen leaks from the detection target (hydrogen leakage site) (to measure the gas leakage value).

[0120] That is, in the case where the reference detection holes 210 and the peripheral detection holes 220 are only provided in the end detection region FDZ of the end head portion 110, the problem is that it is difficult to detect hydrogen leakage in the lateral portion or the rear portion of the end head portion 110 (i.e., the end with respect to the longitudinal direction of the end head portion 110 based on the end connection portion 120, the lateral portion or the rear portion of the end head portion 110).

[0121] On the contrary, in the embodiment of the present disclosure, since the side detection holes 230 are provided between the peripheral detection holes 220 and the end connection portion 120, even if the end detection region FDZ of the end head portion 110 is not accurately aligned with the detection target (the direction of hydrogen leakage from the detection target is inconsistent with the reference detection holes 210), it is possible to detect whether hydrogen leaks from the detection target based on the hydrogen introduced into the side detection holes 230 provided in the lateral portion or the rear portion of the end head portion 110.

[0122] The side detection holes 230 may be basically used to determine whether hydrogen leaks from the detection target. Based on the hydrogen introduced through the reference detection holes 210 and the peripheral detection holes 220, the leakage rate of hydrogen from the detection target (gas leakage value) can be detected.

[0123] The side detection holes 230 may have various structures according to the required conditions and design specifications. The embodiments of the present disclosure are not limited or restricted by the structure and shape of the side detection holes 230.

[0124] For example, the side detection hole 230 may be provided in the form of a circular hole. Alternatively, the side detection hole 230 may have a quadrilateral shape, an oval shape, or other shapes.

[0125] The size (diameter) of the side detection hole 230 may vary in various ways according to the required conditions and design specifications. Embodiments of the present disclosure are not limited or restricted by the size of the side detection hole 230.

[0126] According to an exemplary embodiment of the present disclosure, the diameter of the side detection hole 230 may be defined as 4 mm. According to another embodiment of the present disclosure, the diameter of the side detection hole may be less than 4 mm or greater than 4 mm.

[0127] According to an exemplary embodiment of the present disclosure, the side detection hole 230 may include: a first side hole 232 provided between the peripheral detection hole 220 and the end connection portion 120; and a second side hole 234 provided between the first side hole 232 and the end connection portion 120 and spaced apart from the first side hole 232.

[0128] For example, the first side hole 232 and the second side hole 234 may be provided in different rows along the longitudinal direction of the end connection portion 120.

[0129] As a reference, in the embodiments of the present disclosure shown and described above, an example in which the side detection hole 230 includes the first side hole 232 and the second side hole 234 is described. However, according to another embodiment of the present disclosure, the side detection hole may include three or more side holes, or the side detection hole may be provided as a single side hole.

[0130] According to an exemplary embodiment of the present disclosure, the center of the first side hole 232 may be located on the second reference line SL2, which is inclined at a preset second reference angle θ2 with respect to the center line CL passing through the center of the end head portion 110 and the center of the reference detection hole 210.

[0131] The second reference angle θ2 may vary in various ways according to the required conditions and design specifications. Embodiments of the present disclosure are not limited or restricted by the magnitude of the second reference angle θ2.

[0132] According to an exemplary embodiment of the present disclosure, the second reference angle θ2 may be defined as 90 degrees.

[0133] In addition, according to an exemplary embodiment of the present disclosure, the center of the second side hole 234 may be located on the third reference line SL3, which is inclined at a preset third reference angle θ3 with respect to the center line CL passing through the center of the end head portion 110 and the center of the reference detection hole 210.

[0134] The third reference angle θ3 can vary in various ways according to the required conditions and design specifications. Embodiments of the present disclosure are not limited or restricted by the magnitude of the third reference angle θ3.

[0135] According to an exemplary embodiment of the present disclosure, the third reference angle θ3 can be defined as 120 degrees.

[0136] The number and arrangement of the first side holes 232 and the second side holes 234 can vary in various ways according to the required conditions and design specifications. Embodiments of the present disclosure are not limited or restricted by the number and arrangement of the first side holes 232 and the second side holes 234.

[0137] According to an exemplary embodiment of the present disclosure, a plurality of first side holes 232 and a plurality of second side holes 234 can be arranged radially and spaced apart from each other in the circumferential direction based on the center line CL (with respect to the reference detection hole 210).

[0138] In particular, four first side holes 232 can be arranged to be spaced apart from each other at equal intervals in the circumferential direction based on the center line CL, and three second side holes 234 can be arranged to be spaced apart from each other at equal intervals in the circumferential direction based on the center line CL.

[0139] According to another embodiment of the present disclosure, the number of the first side holes can be defined as less than four or equal to or greater than five. Similarly, the number of the second side holes can be defined as less than three or equal to or greater than four.

[0140] The ratio of the sum of the opening areas of the reference detection hole 210, the peripheral detection holes 220, and the side detection holes 230 to the total area of the end head portion 110 (the total outer surface area of the end head portion 110) can vary in various ways according to the required conditions and design specifications.

[0141] According to an exemplary embodiment of the present disclosure, the sum of the opening areas of the reference detection hole 210, the peripheral detection holes 220, and the side detection holes 230 (for example, the sum of the opening areas of one reference detection hole, six peripheral detection holes, four first side holes, and three second side holes) can be defined as less than 15% of the total area of the end head portion 110.

[0142] This is based on the fact that when the sum of the opening areas of the reference detection hole 210, the peripheral detection holes 220, and the side detection holes 230 is equal to or greater than 15% of the total area of the end head portion 110, the measurement dispersion related to the hydrogen leakage rate (gas leakage value) becomes large due to external influences (e.g., external air), which reduces the detection accuracy. According to an embodiment of the present disclosure, since the sum of the opening areas of the reference detection hole 210, the peripheral detection holes 220, and the side detection holes 230 is defined to be less than 15% of the total area of the end head portion 110, an advantageous effect of reducing the measurement dispersion related to the hydrogen leakage rate (gas leakage value) caused by external influences and improving the detection accuracy can be obtained.

[0143] In particular, the sum of the opening areas of the reference detection hole 210, the peripheral detection holes 220, and the side detection holes 230 can be defined to be 14% of the total area of the end head portion 110.

[0144] Meanwhile, according to an exemplary embodiment of the present disclosure, a negative pressure can be applied to the hydrogen detection pipeline 30, and a suction pressure can be applied to the reference detection hole 210, the peripheral detection holes 220, and the side detection holes 230 based on the negative pressure.

[0145] The suction rate (the suction rate achieved by the suction pressure) passing through the reference detection hole 210, the peripheral detection holes 220, and the side detection holes 230 can be variously changed according to the required conditions and design specifications. The embodiments of the present disclosure are not limited or restricted by the suction rate passing through the reference detection hole 210, the peripheral detection holes 220, and the side detection holes 230.

[0146] According to an exemplary embodiment of the present disclosure, the suction rate passing through the reference detection hole 210, the peripheral detection holes 220, and the side detection holes 230 can be defined to be 3000 sccm.

[0147] Hereinafter, reference will be made to Figures 6 to 9 Describe comparative examples (Comparative Example 1 to Comparative Example 4) of the gas leakage detection device according to the embodiments of the present disclosure.

[0148] Reference Figure 6, Comparative Example 101 of the gas leakage detection device according to an embodiment of the present disclosure includes a terminal head portion 110 (with a diameter of 20 mm and a thickness of 2 mm) and a terminal connection portion 120. The terminal head portion 110 has a total of fifteen detection holes, including a reference detection hole 210 (with a diameter of 4 mm), a peripheral detection hole 220 (with a diameter of 4 mm), and a side detection hole 230 (with a diameter of 4 mm), and the sum of the opening areas of the reference detection hole 210, the peripheral detection hole 220, and the side detection hole 230 is defined as 15% of the total area of the terminal head portion 110. In addition, in Comparative Example 101, the terminal detection area is defined as 22% of the total area of the terminal head portion, and the sum of the opening areas of the reference detection hole 210 and the peripheral detection hole 220 is defined as 22.7% of the area of the terminal detection area.

[0149] Reference Figure 7 , Comparative Example 102 of the gas leakage detection device according to an embodiment of the present disclosure includes a terminal head portion 110 (with a diameter of 20 mm and a thickness of 2 mm) and a terminal connection portion 120. The terminal head portion 110 has a total of forty-five detection holes, including a reference detection hole 210 (with a diameter of 4 mm), a peripheral detection hole 220 (with a diameter of 4 mm), and a side detection hole 230 (with a diameter of 4 mm), and the sum of the opening areas of the reference detection hole 210, the peripheral detection hole 220, and the side detection hole 230 is defined as 45% of the total area of the terminal head portion 110.

[0150] Reference Figure 8 , Comparative Example 103 of the gas leakage detection device according to an embodiment of the present disclosure includes a terminal head portion 110 (with a diameter of 20 mm and a thickness of 2 mm) and a terminal connection portion 120. The terminal head portion 110 has a total of seventeen detection holes, including a reference detection hole 210 (with a diameter of 4 mm), a peripheral detection hole 220 (with a diameter of 4 mm), and a side detection hole 230 (with a diameter of 4 mm), and the sum of the opening areas of the reference detection hole 210, the peripheral detection hole 220, and the side detection hole 230 is defined as 17% of the total area of the terminal head portion 110. In addition, in Comparative Example 103, the terminal detection area is defined as 33.7% of the total area of the terminal head portion, and the sum of the opening areas of the reference detection hole 210 and the peripheral detection hole 220 is defined as 50.4% of the area of the terminal detection area.

[0151] Reference Figure 9, Comparative example four 104 of the gas leakage detection device according to an embodiment of the present disclosure includes a terminal head portion 110 (with a diameter of 20 mm and a thickness of 2 mm) and a terminal connection portion 120. The terminal head portion 110 has a total of fourteen detection holes, including a reference detection hole 210 (with a diameter of 8 mm) (D3), peripheral detection holes 220 (with a diameter of 8 mm) (D3), and side detection holes 230 (with a diameter of 8 mm) (D3), and the sum of the opening areas of the reference detection hole 210, the peripheral detection holes 220, and the side detection holes 230 is defined as 52.5% of the total area of the terminal head portion 110.

[0152] Figure 10 is a view for explaining the gas leakage values of multiple comparative examples according to the number and size of the detection holes, and Figure 11 is a view for explaining the gas leakage rates of multiple comparative examples according to the number and size of the detection holes.

[0153] For reference, Figure 10 shows the results of measuring the concentration (gas leakage value) of hydrogen leaked from the detection target (hydrogen leakage site) of each comparative example by using a COSMOS type concentration meter (basic gas leakage value: 2.4E - 03 cc / sec to 2.5E - 03 cc / sec). Figure 11 shows the results of measuring the gas leakage rate of hydrogen leaked from the detection target (hydrogen leakage site) of each comparative example by using an INFICON suction type gas leakage rate meter (basic gas leakage value: 2.4E - 03 cc / sec to 2.5E - 03 cc / sec).

[0154] Reference Figure 10 , it can be seen that as the size (diameter) and number of the detection holes (reference detection hole, peripheral detection holes, and side detection holes) provided in the terminal head portion 110 increase, the detection rate decreases and the dispersion increases, making it difficult to establish a standard.

[0155] In particular, it can be seen that in comparative example two 102 (forty - five detection holes, detection hole diameter of 4 mm), the gas leakage value is small, and compared with comparative example one 101 (fifteen detection holes, detection hole diameter of 4 mm), the detection rate decreases. Additionally, it can be seen that in comparative example four 104 (fourteen detection holes, detection hole diameter of 8 mm), compared with comparative example one and comparative example two, its detection rate is significantly reduced, and the gas leakage value (the gas leakage value as the lower limit of the detection range) cannot be measured. Therefore, it can be seen that detection holes with small size and small number are relatively advantageous for measuring dispersion.

[0156] On the contrary, reference Figure 11, it can be seen that, since a suction-type gas leak rate meter is used to compensate for the suction force related to the measurement dispersion, the measurement dispersions of the comparative examples (Comparative Example 1, Comparative Example 2, and Comparative Example 4) are relatively small.

[0157] Figure 12 is a view for explaining the gas leak rate of an embodiment of the present disclosure according to the detection angle relative to the leak point.

[0158] For reference, Figure 12 shows the results of the gas leak rate (basic gas leak value: 2.7E-03 cc / sec to 2.8E-03 cc / sec) of hydrogen leaking from the detection target (hydrogen leak site) measured according to the detection angle relative to the leak point for an embodiment of the present disclosure and multiple comparative examples by using an INFICON-type suction-type gas leak rate meter.

[0159] Reference Figure 12 , it can be seen that, in the embodiment of the present disclosure, the dispersion according to the detection angle relative to the leak point (the angle of the leak point relative to the end head portion based on the center line) is relatively small. Specifically, it can be seen that, in the embodiment of the present disclosure, at the point where the detection angle is 0 degrees relative to the leak point (at a part of the reference detection hole 210), the accuracy of the gas leak value (2.8E-03 cc / sec) is the highest.

[0160] On the contrary, it can be seen that, in Comparative Example 101, the accuracy of the gas leak value (2.4E-03 cc / sec to 2.5E-03 cc / sec) at the point where the detection angle is 0 degrees relative to the leak point is lower than that of the embodiment of the present disclosure. In addition, it can be seen that, in Comparative Example 103, the ratio of the total area of the end detection region to the end head portion is higher than that of the embodiment of the present disclosure (Comparative Example 3: 33.7%, embodiment of the present disclosure: 12.3%), and the ratio of the sum of the opening areas of the reference detection hole 210 and the peripheral detection holes 220 to the area of the end detection region is lower than that of the embodiment of the present disclosure (Comparative Example 3: 50.4%, embodiment of the present disclosure: 57.1%), resulting in a relatively large dispersion (2.3E-03 cc / sec to 2.5E-03 cc / sec) of the gas leak value due to the greater influence of external air.

[0161] Figure 13 is a view for explaining the gas leak rate of an embodiment of the present disclosure according to the number of detection holes under low suction rate conditions.

[0162] For reference, Figure 13Shows the results of measuring the gas leakage rate of hydrogen leaked from a detection target (hydrogen leakage site) under the condition of a low pumping rate of 300 sccm using an INFICON type suction gas leakage rate meter.

[0163] Reference Figure 13 , it can be seen that under the condition of a low pumping rate, an increase in the number of detection holes (reference detection holes, peripheral detection holes, and side detection holes) makes it difficult to converge the gas leakage value.

[0164] Specifically, it can be seen that in Comparative Example 101 (fifteen detection holes with a diameter of 4 mm), the dispersion degree of the gas leakage value is greater than that of the gas leakage value in the embodiment of the present disclosure (fourteen detection holes with a diameter of 4 mm). In addition, it can be seen that in Comparative Example 102 (forty-five detection holes with a diameter of 4 mm) and Comparative Example 103 (seventeen detection holes with a diameter of 4 mm), the gas leakage values cannot converge.

[0165] Therefore, it can be seen that the ratio of the total area of the end detection region to the end head portion and the ratio of the sum of the opening areas of the reference detection holes and the peripheral detection holes to the area of the end detection region affect the gas leakage rate.

[0166] Figure 14 Is a view for explaining the gas leakage rate of comparative examples according to the size of detection holes under low pumping rate conditions and high pumping rate conditions.

[0167] For reference, Figure 14 Shows the results of measuring the gas leakage rate of hydrogen leaked from a detection target (hydrogen leakage site) under the high pumping rate condition of 3000 sccm and the low pumping rate condition of 300 sccm using an INFICON type suction gas leakage rate meter.

[0168] Reference Figure 14 , it can be seen that under the low pumping rate condition of 300 sccm, the gas leakage values in Comparative Example 102 (forty-five detection holes with a diameter of 4 mm) and Comparative Example 104 (fourteen detection holes with a diameter of 8 mm) are difficult to converge, where the number and size (diameter) of the detection holes (reference detection holes, peripheral detection holes, and side detection holes) in Comparative Example 2 and Comparative Example 4 are greater than those of the detection holes in the embodiment of the present disclosure.

[0169] In contrast, it can be seen that under the condition of a high suction rate of 3000 sccm, such as in Comparative Example 2 102 and Comparative Example 4 104, even when the number of detection holes (reference detection hole, peripheral detection hole, and side detection hole) increases and the size (diameter) increases, the gas leakage value converges, but the time required for the gas leakage value to converge increases, and the dispersion of the gas leakage value (2.0E-03 cc / sec to 2.3E-03 cc / sec) is relatively large.

[0170] Meanwhile, Figure 15 is a view for explaining the gas leakage rate according to the suction rate of the embodiments of the present disclosure.

[0171] For reference, Figure 15 shows the results of measuring the gas leakage rate of hydrogen leaked from a detection target (hydrogen leakage site) under the conditions of a high suction rate of 3000 sccm and a low suction rate of 300 sccm by using an INFICON type suction gas leakage rate meter.

[0172] Referring to Figure 15 , it can be seen that in the embodiments of the present disclosure, under the condition of a low suction rate of 300 sccm, the detection rate decreases, and compared with the high suction rate condition of 3000 sccm, it takes relatively more time for the gas leakage value to converge.

[0173] In particular, it can be seen that under the condition of a high suction rate of 3000 sccm, the detection rate (2.5E-03 cc / sec to 2.6E-03 cc / sec) is high, and the time required for the gas leakage value to converge (2 seconds to 3 seconds) is less, while under the condition of a low suction rate of 300 sccm, the detection rate (1.4E-03 cc / sec to 1.7E-03 cc / sec) is low, and the time required for the gas leakage value to converge (6 seconds to 19 seconds) increases.

[0174] According to the above embodiments of the present disclosure, beneficial effects of improving the accuracy of hydrogen leakage inspection and enhancing safety and reliability can be obtained.

[0175] Specifically, according to the embodiments of the present disclosure, beneficial effects of minimizing the deviation of the accuracy of hydrogen leakage inspection (the deviation varies according to the experience and ability of the operator) and easily and accurately detecting whether hydrogen leaks can be obtained.

[0176] In addition, according to the embodiments of the present disclosure, beneficial effects of accurately performing hydrogen leakage inspection can be obtained without being significantly affected by the attitude (angle and distance) of the detection end relative to the inspection site.

[0177] In addition, according to an embodiment of the present disclosure, an advantageous effect of simplifying the hydrogen leakage inspection process and shortening the time required for the inspection process can be obtained.

[0178] In addition, according to an embodiment of the present disclosure, an advantageous effect of minimizing errors in hydrogen leakage inspection and quantifying the results of hydrogen leakage inspection can be obtained.

[0179] Although multiple embodiments have been described above, these embodiments are merely illustrative and are not intended to limit the present disclosure. Those skilled in the art can understand that various modifications and applications not described above can be made to the embodiments of the present disclosure without departing from the inherent characteristics of the embodiments of the present disclosure. For example, each component specifically described in the embodiments can be modified and then implemented. In addition, it should be understood that the differences related to the modifications and applications are included within the scope of the present disclosure defined by the appended claims.

[0180] List of reference numerals:

[0181] 10. Gas leakage detection device

[0182] 20. Hydrogen supply pipeline

[0183] 30. Hydrogen detection pipeline

[0184] 40. Hydrogen detection section

[0185] 100. Detection end

[0186] 110. End head part

[0187] 120. End connection part

[0188] 210. Reference detection hole

[0189] 220. Peripheral detection hole

[0190] 230. Side detection hole

[0191] 232. First side hole

[0192] 234. Second side hole

Claims

1. A gas leakage detection device, comprising: The terminal head portion has a spherical shape; a terminal connection portion configured to communicate with the terminal head portion and be connectable to a hydrogen detection line; a reference detection hole provided at an end of the terminal head portion based on the longitudinal direction of the terminal connection portion; as well as A peripheral detection hole is provided in the terminal head portion and is spaced apart from the reference detection hole, and the peripheral detection hole points in a direction intersecting with the reference detection hole.

2. The gas leakage detection device according to claim 1, wherein: The center of the peripheral detection hole is located on a first reference line, and the first reference line is inclined at a preset first reference angle relative to a center line passing through the center of the terminal head portion and the center of the reference detection hole.

3. The gas leakage detection device according to claim 2, wherein: The first reference angle is 45 degrees or less.

4. The gas leakage detection device according to claim 2, wherein: The first reference angle is 30 degrees.

5. The gas leakage detection device according to claim 2, wherein: The peripheral detection holes include a plurality of peripheral detection holes spaced apart from each other in a circumferential direction based on the center line.

6. The gas leakage detection device according to claim 2, wherein: The diameter of the end head portion is 20 mm and the thickness is 2 mm; The diameter of each of the reference detection holes and the peripheral detection holes is 4 mm; and The peripheral detection holes include seven peripheral detection holes spaced apart from each other at equal intervals in a circumferential direction based on the center line.

7. A gas leakage detection device, comprising: The terminal head portion has a spherical shape; a terminal connection portion configured to communicate with the terminal head portion and be connectable to a hydrogen detection line; a reference detection hole provided at an end of the terminal head portion based on the longitudinal direction of the terminal connection portion; a peripheral detection hole, disposed in the end head portion and spaced apart from the reference detection hole, and the peripheral detection hole points in a direction intersecting with the reference detection hole; as well as A side detection hole is provided in the terminal head portion and is located between the peripheral detection hole and the terminal connecting portion.

8. The gas leakage detection device according to claim 7, wherein: The side detection hole comprises: A first side hole disposed between the peripheral detection hole and the terminal connection portion; and A second side hole is disposed between the first side hole and the terminal connecting portion and is spaced apart from the first side hole.

9. The gas leakage detection device according to claim 8, wherein: The center of the first side hole is located on a second reference line, and the second reference line is inclined at a preset second reference angle relative to a center line passing through the center of the terminal head portion and the center of the reference detection hole; and The center of the second side hole is located on a third reference line, and the third reference line is inclined at a preset third reference angle relative to a center line passing through the center of the terminal head portion and the center of the reference detection hole.

10. The gas leakage detection device according to claim 9, wherein: The second reference angle is 90 degrees and the third reference angle is 120 degrees.

11. The gas leakage detection device according to claim 9, wherein: The first side holes include a plurality of first side holes spaced apart from each other in a circumferential direction based on the centerline; and The second side holes include a plurality of second side holes spaced apart from each other in a circumferential direction based on the center line.

12. The gas leakage detection device according to claim 11, wherein: The diameter of the end head portion is 20 mm and the thickness is 2 mm; The diameter of each of the plurality of first side holes and the plurality of second side holes is 4 mm; The plurality of first side holes include four first side holes spaced apart from each other at equal intervals in a circumferential direction based on the center line; and The plurality of second side holes include three second side holes spaced apart from each other at equal intervals in a circumferential direction based on the center line.

13. The gas leakage detection device according to claim 7, wherein: The sum of the opening areas of the reference detection hole, the peripheral detection hole, and the side detection hole is less than 15% of the total area of ​​the terminal head portion.

14. The gas leakage detection device according to claim 7, wherein: When negative pressure is applied to the hydrogen detection line, suction pressure is applied to the reference detection hole, the peripheral detection hole, and the side detection hole based on the negative pressure.

15. The gas leakage detection device according to claim 14, wherein: The suction rate through the reference detection hole, the peripheral detection hole and the side detection hole is 3000 sccm.

16. A gas leakage detection device, comprising: The terminal head portion has a spherical shape; a terminal connection portion configured to communicate with the terminal head portion and be connectable to a hydrogen detection line; a reference detection hole provided at an end of the terminal head portion based on the longitudinal direction of the terminal connection portion; as well as A peripheral detection hole is arranged in the terminal head part and is spaced apart from the reference detection hole, and the peripheral detection hole points in a direction intersecting with the reference detection hole, wherein the reference detection hole and the peripheral detection hole are located in a terminal detection area, and the terminal detection area is located on the terminal part of the terminal head part based on the longitudinal direction of the terminal connection part.

17. The gas leakage detection device according to claim 16, wherein: The terminal detection area is 15% or less of the total area of ​​the terminal head portion.

18. The gas leakage detection device according to claim 16, wherein: The sum of the opening areas of the reference detection hole and the peripheral detection hole is 55% or more of the area of ​​the terminal detection region.

19. The gas leakage detection device according to claim 16, wherein: The total opening area of ​​the reference detection hole and the peripheral detection hole is 57.1% of the area of ​​the terminal detection region.

20. The gas leakage detection device according to claim 16, wherein: The center of the peripheral detection hole is located on a first reference line, and the first reference line is inclined at a preset first reference angle relative to a center line passing through the center of the terminal head portion and the center of the reference detection hole.

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