Gas leak experiment device and gas leak experiment method

Abstract

To provide a gas leak experimental device and a gas leak experimental method capable of adjusting an inspection device at a desired place.SOLUTION: An experimental device 1 used for adjusting an inspection accuracy of a gas leak inspection device 100 that detects a gas from a position away from an inspection place, the experimental device 1 including a device main body 10 having an inspection space 10h therein to which a testing gas TG is supplied, and having side walls 1311 facing each other each provided with a communication window 13h that communicates between an inside and an outside of the inspection space, a testing gas supplying part 20 that supplies the testing gas TG to the device main body 10, a gas sucking part 30 that a gas from the inspection space 10h, and a shielding gas supplying part 40 that supplies a shielding gas to each communication window 13h to form an air curtain 10h, the shielding gas blocking between the inspection space AC1 and the outside.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a gas leak testing device and a gas leak testing method. [Background technology]

[0002] When a gas leak occurs in a facility such as a chemical plant or shipyard, it is necessary to detect the leak early and take measures to prevent it. For this reason, in facilities such as chemical plants and shipyards (hereinafter sometimes simply referred to as the facility under inspection), workers carrying gas leak detectors etc. periodically patrol the facility to check for gas leaks.

[0003] However, when an operator patrols the facility to be inspected, the operator cannot patrol the facility very frequently, and if the timing of the patrol does not coincide with the occurrence of a gas leak, the operator is unable to quickly identify the gas leak. Therefore, an inspection device is installed in an area of ​​the facility to be inspected where a gas leak is likely to occur, and gas leaks are inspected constantly, and in recent years, gas leak inspections using inspection devices that utilize optical techniques have also been adopted (see Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] WO2019 / 044898 publication Summary of the Invention [Problem to be solved by the invention]

[0005] Gas leaks may occur in a variety of locations within a facility under inspection, and the surrounding environments vary greatly. In the case of inspection devices employing non-contact methods such as optical techniques, the surrounding environment significantly affects inspection accuracy, making it necessary to adjust the inspection device to obtain appropriate inspection accuracy depending on the installation location, i.e., the location where the inspection is being performed. In other words, even if the inspection device is adjusted in the testing facility or at a manufacturing plant for the inspection device, it is difficult to accurately detect gas leaks at the actual site unless the inspection device is adjusted at that site.

[0006] When adjusting the testing equipment at the site where such an inspection is performed, it is desirable to adjust the testing equipment so that the same gas (test gas) as the gas to be tested is present at the site and the test gas concentration can be properly determined. However, gas leaks often occur within explosion-proof areas, and it is not possible to have the test gas present within explosion-proof areas. Therefore, at present, it is difficult to adjust the testing equipment at the actual inspection site where there is a possibility of gas leaks occurring within the explosion-proof area.

[0007] In view of the above circumstances, an object of the present invention is to provide a gas leak testing device and a gas leak testing method that allow adjustment of an inspection device at a desired location. [Means for solving the problem]

[0008] <Gas leak experiment device> The gas leak experimental device of the present invention is an experimental device used to adjust the inspection accuracy of a gas leak inspection device that detects gas from a position away from the inspection location, and is characterized by comprising: an apparatus main body having an inspection space inside which a test gas is supplied, and having communication windows on opposing side walls that connect the inside of the inspection space to the outside; a test gas supply unit that supplies the test gas to the apparatus main body; a gas suction unit that suctions gas from the inspection space; and a shielding gas supply unit that supplies a shielding gas to each communication window to isolate the inspection space from the outside, thereby forming an air curtain. <Gas leak test method> The gas leak testing method of the present invention is a method for adjusting the testing accuracy of a gas leak testing device that detects gas from a position away from the testing location, and is characterized in that the main body of the gas leak testing device of the present invention is installed in an testing area within an explosion-proof area, and the gas leak testing device is installed outside the explosion-proof area so as to test the testing space through a communication window in the main body of the gas leak testing device. [Effects of the Invention]

[0009] <Gas leak experiment device> According to the gas leak testing device of the present invention, if the device main body is placed in the testing area where the test is to be performed, the test gas in the testing space can be measured by the gas leak testing device from a position away from the testing area. This allows the gas leak testing device to be adjusted to a state suitable for testing in the environment of the area where the test is actually performed, thereby improving the accuracy of gas leak testing by the gas leak testing device. <Gas leak test method> According to the gas leak testing method of the present invention, even if the testing area where the test is performed is within an explosion-proof area, the testing accuracy of the gas leak testing device can be adjusted using test gas, thereby improving the accuracy of gas leak testing by the gas leak testing device. [Brief explanation of the drawings]

[0010] [Figure 1] (A) is a schematic diagram of the gas leak testing device 1 of this embodiment, and (B) is a schematic diagram of the situation in which the target gas leak testing device 100 performs a gas detection test within an explosion-proof area BA using the gas leak testing device 1 of this embodiment. [Figure 2] FIG. 2 is a schematic vertical cross-sectional view of the device main body 10. [Figure 3] 2. (A) is a cross-sectional view taken along line IIIA-IIIA in FIG. 2, and (B) is a cross-sectional view taken along line IIIB-IIIB in FIG. [Figure 4] 1 is a schematic explanatory diagram of a gas leakage test device 1 provided with a second shielding gas supply unit 50. FIG. [Figure 5]1 is a schematic vertical cross-sectional view of the main body 10 of the gas leakage test device 1 provided with a second shielding gas supply unit 50. FIG. [Figure 6] 5, and (B) is a cross-sectional view taken along line VIB-VIB in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] The gas leak testing device of this embodiment is an experimental device used to adjust the testing accuracy of a gas leak testing device that detects gas from a location away from the testing site, and is a device that makes it possible to test in locations where it is not possible to release the gas to be tested and adjust the testing device.

[0012] <Gas leak detection device> The gas leak inspection device (hereinafter sometimes simply referred to as target gas leak inspection device 100) that adjusts inspection accuracy using the gas leak experiment device of this embodiment is not particularly limited as long as it is a device that can detect gas remotely. For example, an infrared inspection device that detects gas by detecting infrared rays, an ultrasonic inspection device that detects gas by ultrasonic waves, etc. may be mentioned.

[0013] <Gases to be tested> There are no particular limitations on the type of test gas that can be tested by the test gas leak test device 100. For example, hydrocarbon gases such as methane gas, propane gas, and propylene can be used as test gases. In addition, ammonia, hydrogen, carbon monoxide, and the like can also be used as test gases.

[0014] <Test gas> The test gas used for testing by the gas leak testing apparatus of this embodiment is preferably a gas that is actually tested by the target gas leak test apparatus 100 at the test location. In other words, the test gas is preferably a gas that may actually cause a gas leak at the test location and that is detected by the target gas leak test apparatus. Therefore, the test target gas described above can be used as the test gas. In the following description, the test gas may be a test gas consisting essentially of the aforementioned gases (for example, a gas concentration of 95% or more). Alternatively, a gas prepared to a predetermined concentration of the aforementioned gas may be used as the test gas. For example, a gas prepared to a concentration that can be generated at the location where the target gas leak inspection device 100 is to inspect may be used as the test gas. Considering the safety of the test, a gas prepared to have a concentration lower than the lower explosion limit or higher than the upper explosion limit may be used as the test gas.

[0015] <Area to be inspected> The location where an experiment is conducted using the gas leak experiment apparatus of this embodiment, i.e., the location inspected by the target gas leak inspection apparatus 100 (i.e., the inspection target area), is not particularly limited. Typically, the inspection target area can be a location where an inspection using the target gas cannot be conducted (or is prohibited). For example, the inspection target area can be an explosion-proof area in a plant facility or factory where there is a possibility of flammable gas being present in the air, which could result in a fire or explosion.

[0016] <Gas leak test device 1 of this embodiment> The gas leak test device 1 of this embodiment will be described with reference to the drawings. As shown in Fig. 1(A), the gas leak test device 1 of this embodiment includes an apparatus main body 10, a test gas supply unit 20, a gas suction unit 30, and a shielding gas supply unit 40.

[0017] <Device body 10> 1, the device main body 10 has an inspection space 10h, which is a hollow space, inside. For example, the device main body 10 has a top plate 11, a bottom plate 12, and four side walls 13 provided between the top plate 11 and the bottom plate 12, and is a member in which the inspection space 10h is formed in an area surrounded by the top plate 11, the bottom plate 12, and the four side walls 13.

[0018] As shown in Figures 1 and 2, communication windows 13h, which are through-holes that communicate between the inside of the test space 10h and the outside, are formed in the four side walls 13. These communication windows 13h are maintained in a state where no substances that would affect the test are present when the target gas leak test device 100 detects gas in the test space 10h through the communication windows 13h. Specifically, the area where the communication windows 13h are provided is maintained in a state where no substances that would affect the test are present. In other words, the communication windows 13h are formed as simple through-holes that contain nothing other than the first air curtain AC1, which will be described later.

[0019] In the following, "the target gas leak test device 100 detects gas in the test space 10h through the communication window 13h" may simply be referred to as "the target gas leak test device 100 detects gas." Also, "the target gas leak test device 100 performs a test to detect gas in the test space 10h through the communication window 13h" may simply be referred to as "the target gas leak test device 100 performs a gas detection test."

[0020] <Test gas supply unit 20> 1, a test gas supply unit 20 is connected to the device main body 10. This test gas supply unit 20 supplies a test gas TG into the test space 10h when the target gas leak test device 100 performs a gas detection test.

[0021] The test gas supply unit 20 includes a test gas outlet 21 provided on the bottom plate 12 of the device body 10. The test gas outlet 21 is, for example, a nozzle, and is capable of ejecting the supplied test gas TG upward (in other words, toward the inside of the testing space 10h). The test gas outlet 21 is provided so as to be located at the center of the testing space 10h (i.e., the center of the bottom plate 12) in a plan view (see FIGS. 2 and 3(B)).

[0022] A test gas supply mechanism 23 is connected to the test gas ejection unit 21 via a supply pipe 22. The test gas supply mechanism 23 includes a supply unit 23a that has the function of supplying the test gas TG to the supply pipe 22. The supply unit 23a may be any suitable unit as long as it has the function of supplying the test gas TG to the supply pipe 22, and may be, for example, a cylinder that stores the test gas TG or equipment that supplies the test gas TG. The test gas supply mechanism 23 has a flow regulator 23b that adjusts the flow rate of the test gas TG supplied from the supply unit 23a to the supply pipe 22, i.e., the flow rate of the test gas TG supplied into the testing space 10h. Note that if the supply unit 23a itself has the function of adjusting the flow rate of the test gas TG supplied to the supply pipe 22, the flow regulator 23b is not necessarily provided.

[0023] <Gas suction unit 30> As shown in Fig. 1, a gas suction unit 30 is connected to the device main body 10. This gas suction unit 30 has a suction unit 31 that sucks in the test gas TG supplied into the testing space 10h by the test gas supply unit 20. This suction unit 31 is, for example, a through-hole provided in the top plate 11, and is provided so as to be located vertically above the test gas outlet unit 21 of the test gas supply unit 20. In other words, the suction unit 31 is provided so as to be located at the center of the testing space 10h (i.e., the center of the top plate 11) when viewed from the bottom (see Figs. 2 and 3(A)).

[0024] A processing unit 33 is connected to the suction unit 31 via a recovery pipe 32. The processing unit 33 has a function of sucking gas from the testing space 10h through the suction unit 31 and the recovery pipe 32, and a function of storing and disposing of the sucked gas. The processing unit 33 may have any configuration as long as it can achieve the above-mentioned functions, and may have the following configuration, for example.

[0025] As shown in FIG. 1(A), the processing unit 33 has a suction device 33a, such as a vacuum pump, connected to the recovery pipe 32. By operating this suction device 33a, gas within the testing space 10h, specifically, the test gas TG and gases other than the test gas TG, such as the air within the testing space 10h, can be sucked in. The suction device 33a is provided with a storage tank 33b for storing the sucked gas. With this configuration of the processing unit 33, the test gas TG stored in the storage tank 33b can be supplied to the test gas supply unit 20, allowing the test gas TG to be reused. Instead of the storage tank 33b, the processing unit 33 may be provided with a mechanism for burning and treating the test gas TG or diluting and releasing it into the atmosphere.

[0026] When the gas in the storage tank 33b is supplied to the test gas supply unit 20, the gas in the storage tank 33b and the gas supplied from the supply unit 23a of the test gas supply mechanism 23 of the test gas supply unit 20 are mixed and supplied to the supply piping 22 of the test gas supply unit 20. The gas in the storage tank 33b is likely to contain gases other than the test gas TG. Therefore, if the gas in the storage tank 33b is supplied directly to the supply piping 22, the concentration of the test gas TG supplied from the test gas outlet 21 to the testing space 10h may deviate from the predetermined concentration. Therefore, it is desirable to provide a device for measuring the concentration of the test gas TG in the storage tank 33b and to provide the processing unit 33 with a function for adjusting the concentration of the test gas TG in the gas supplied from the storage tank 33b based on the measured concentration.

[0027] <Shielding gas supply unit 40> As shown in Fig. 1, a shielding gas supply unit 40 is connected to the device body 10. This shielding gas supply unit 40 is provided to form the first air curtain AC1 in the communication windows 13h of the four side walls 13 of the device body 10 described above. Specifically, a shielding gas ejection unit 41 is provided on one inner edge of the communication window 13h (the lower inner edge in Figs. 2 and 3(B)). This shielding gas ejection unit 41 is, for example, a slit-shaped opening formed along the lower inner edge of the communication window 13h.

[0028] The shielding gas ejection unit 41 is provided with a shielding gas supply mechanism 43 via a supply pipe 42. The shielding gas supply mechanism 43 may be, for example, a cylinder storing the shielding gas or a facility for supplying the shielding gas. The shielding gas supplied from the shielding gas supply mechanism 43 is not particularly limited, and air is usually used. However, a gas that does not react with the test gas TG even when mixed with the test gas TG may also be used. For example, an inert gas such as nitrogen gas may be used as the shielding gas.

[0029] Furthermore, a shielding gas suction section 45 is provided on an inner edge (the upper inner edge in FIGS. 2 and 3(A)) opposite to the inner edge where the shielding gas outlet section 41 of the communication window 13h is provided, which sucks in the shielding gas ejected from the shielding gas outlet section 41. This shielding gas suction section 45 is, for example, a slit-shaped opening formed along the upper inner edge of the communication window 13h.

[0030] The shielding gas suction part 45 is provided with a shielding gas suction mechanism 47 via a recovery pipe 46. The shielding gas suction mechanism 47 has a suction device 47a such as a vacuum pump that is connected to the recovery pipe 46. By operating the suction device 47a, the shielding gas ejected from the shielding gas ejection part 41 can be sucked.

[0031] Since the shielding gas supply section 40 has the above-described structure, by ejecting the shielding gas from the shielding gas ejection section 41 while sucking the shielding gas from the shielding gas suction section 45, a first air curtain AC1 can be formed by the shielding gas at the communication window 13h.

[0032] The shielding gas sucked by the suction device 47a may be released into the atmosphere, or may be stored in a storage tank 47b. If the sucked shielding gas is stored in the storage tank 47b, the shielding gas stored in the storage tank 47b can be reused.

[0033] <Gas leak experiment method using the gas leak experiment device 1 of this embodiment> The gas leak test device 1 of this embodiment has the above-described structure, and therefore the target gas leak inspection device 100 can perform a gas detection test using the test gas TG.

[0034] First, with the first air curtains AC1 formed at all of the communication windows 13h by the shielding gas supply unit 40, the test gas TG is supplied into the test space 10h from the test gas outlet 21 of the test gas supply unit 20, while the gas is sucked through the suction unit 31 of the gas suction unit 30. At this time, if the supply rate (flow rate) of the test gas TG from the test gas outlet 21 and the suction rate (flow rate) of the gas by the suction unit 31 are made equal, a predetermined concentration of the test gas TG can be present in the test space 10h. In this state, the test gas TG in the test space 10h is measured through the communication windows 13h by the target gas leak test device 100, thereby adjusting the test accuracy of the target gas leak test device 100. Furthermore, since the first air curtains AC1 are formed at the communication windows 13h, the test gas TG can be prevented from leaking from the test space 10h of the device main body 10 to the outside. Therefore, even if the test gas TG is an explosive gas or a toxic gas, the target gas leak test device 100 can safely perform a gas detection test.

[0035] Furthermore, in the gas leak testing apparatus 1 of this embodiment, the test gas outlet 21 of the test gas supply unit 20, the suction unit 31 of the gas suction unit 30, the shielding gas outlet 41 and the shielding shielding gas suction unit 45 of the shielding gas supply unit 40 are connected via piping to the test gas supply mechanism 23, the processing unit 33, the shielding gas supply mechanism 43, and the shielding gas suction mechanism 47. That is, the test gas supply mechanism 23 that supplies the test gas TG into the testing space 10h, the processing unit 35 that processes the gas suctioned from the testing space 10h, the shielding gas supply mechanism 43 and the shielding gas suction mechanism 47 that supply and suction the shielding gas that forms the first air curtain AC1 are provided separately from the apparatus main body 10. This allows testing to be performed by installing the apparatus main body 10 and the test gas supply mechanism 23, etc. in separate locations. In other words, when the test gas TG is an explosive gas, a cylinder or the like storing a certain amount of the test gas TG can be installed away from the location where the device main body 10 is installed (the area to be inspected), making it easier to ensure the safety of the area to be inspected. For example, as shown in FIG. 1(B), the device main body 10 can be installed within the explosion-proof area BA (the area to be inspected), and a cylinder or the like can be installed outside the explosion-proof area BA, making it easier to ensure the safety of the area to be inspected. Moreover, since the test gas TG does not leak from the inspection space 10h of the device main body 10, if only the device main body 10 is installed within the explosion-proof area BA and the target gas leak inspection device 100 is installed outside the explosion-proof area BA, the target gas leak inspection device 100 can safely perform a gas detection test even if the area to be inspected is the explosion-proof area BA.

[0036] <About the device main body 10> In the above example, the device body 10 has a box-like shape having a top plate 11, a bottom plate 12, and four side walls 13, but the shape of the device body 10 is not particularly limited as long as a hollow inspection space 10h can be formed inside and the target gas leak inspection device 100 can detect gas through the communication window 13h.

[0037] For example, the device body 10 may have a structure in which the top plate 11 and the bottom plate 12 are connected by pillar-shaped members instead of the four side walls 13. Even in this case, a space (test space 10h) is formed between the top plate 11 and the bottom plate 12, and a space (communication window 13h) is formed that connects this space to the outside. Therefore, similar to the device body 10 described above, if a first air curtain AC1 is formed in each communication window 13h, the target gas leak test device 100 can perform a gas detection test.

[0038] <About the communication window 13h> In the above example, a case where communication windows 13h are formed in all four side walls 13 has been described, but communication windows 13h do not necessarily have to be provided in all side walls 13. For example, communication windows 13h may be provided in only two opposing side walls 13 of the four side walls 13. In other words, among the communication windows 13h, other communication windows 13h may be provided so that when the target gas leak test device 100 inspects the test space 11h through one communication window 13h, no side wall 13 is present behind one communication window 13h (in other words, behind the test gas TG). With this configuration, the target gas leak test device 100 can perform a gas detection test under conditions similar to those in which an actual test is performed (i.e., a state in which the device main body 10 is not present).

[0039] Furthermore, when the target gas leak inspection device 100 inspects the inspection space 11h through one of the communication windows 13h, the side wall 13 located behind the one of the communication windows 13h (in other words, the side wall 13 located behind the test gas TG) may not be provided with a communication window 13h. In this case, the side wall 13 located behind may be provided with a function to be used for the inspection. For example, a pattern or image suitable for the inspection may be written on the side wall 13, or a display device (monitor, display, etc.) that displays a pattern or image suitable for the inspection may be installed and displayed in accordance with the inspection.

[0040] <Regarding the test gas supply unit 20, the gas suction unit 30, and the shielding gas supply unit 40> In the above example, the test gas outlet 21 of the test gas supply unit 20, the suction unit 31 of the gas suction unit 30, and the shielding gas outlet 41 and shielding shielding gas suction unit 45 of the shielding gas supply unit 40 are connected to the test gas supply mechanism 23, the processing unit 33, the shielding gas supply mechanism 43, and the shielding gas suction mechanism 47 via piping. With this configuration, as described above, only the device main body 10 can be installed in the inspection area, with the other mechanisms installed outside the inspection area, thereby improving the safety of the test. Alternatively, all of the mechanisms, the test gas supply unit 20, the gas suction unit 30, and the shielding gas supply unit 40, may be installed in the device main body 10. In this case, the target gas leak inspection device 100 can perform a gas detection test simply by installing the device main body 10 in the inspection area, thereby enabling the gas detection test to be performed in a short time with minimal labor. For example, the device main body 10 is provided with a cylinder storing the test gas TG and a tank storing the shielding gas, and also with a storage tank for storing the gas sucked by the gas suction unit 30 and the shielding gas supply unit 40. This allows the target gas leak inspection device 100 to perform a gas detection test without diffusing the test gas TG or the shielding gas into the inspection area.

[0041] <Regarding the shielding gas supply unit 40> The shielding gas outlet 41 of the shielding gas supply unit 40 does not necessarily have to be a slit-shaped opening, and a plurality of nozzles or the like may be lined up along the inner edge of the lower end of the communication window 13h to form the shielding gas outlet 41. Similarly, the shielding gas suction unit 45 does not necessarily have to be a slit-shaped opening, and a plurality of openings may be lined up along the inner edge of the upper end of the communication window 13h to form the shielding gas suction unit 45. In other words, it is sufficient that the shielding gas outlet 41 and the shielding gas suction unit 45 are provided so that the first air curtain AC1 is formed over almost the entire communication window 13h.

[0042] <About the Second Air Curtain AC2> As described above, the device body 10 has the first gas outlet 41 of the shielding gas supply unit 40 that forms the first air curtain AC1 at the communication window 13h of the device body 10, and the first air curtain AC1 prevents the test gas TG from leaking to the outside through the communication window 13h of the device body 10. To more reliably prevent leakage of the test gas TG, a second shielding gas outlet 51 of the second shielding gas supply unit 50 that supplies a second shielding gas may be provided around the test gas outlet 21 that ejects the test gas TG (see FIGS. 4 to 6). In other words, the second shielding gas that is supplied from the second shielding gas supply mechanism 53 through the supply piping 52 to the second shielding gas outlet 51 and ejected from the second shielding gas outlet 51 may form a second air curtain AC2 to surround the test gas TG. With this configuration, the second shielding gas forming the second air curtain AC2 is sucked into the suction section 31 of the gas suction section 30 provided on the top plate 12 of the device main body 10 while surrounding the test gas TG, thereby more reliably preventing the test gas TG from leaking to the outside through the communication window 13h, etc.

[0043] 6(B) illustrates a case where the second shielding gas ejection part 51 is a circular slit surrounding the test gas ejection part 21. However, the shape and structure of the second shielding gas ejection part 51 are not particularly limited as long as it can eject the second shielding gas so as to form a second air curtain AC2 that surrounds the test gas TG. For example, the second shielding gas ejection part 51 may be formed by arranging multiple nozzles that eject the second shielding gas so as to surround the test gas ejection part 21.

[0044] Both the second shielding gas and the test gas TG may be sucked into the suction part 31 of the gas suction part 30. In this case, the flow rate of the second shielding gas is desirably adjusted so that the concentration of the test gas TG is lower than the lower explosion limit or higher than the upper explosion limit even when the test gas TG and the shielding gas are mixed together. In other words, even when the test gas TG and the shielding gas are sucked into the suction part 31 of the gas suction part 30 as a mixed gas, the concentration of the test gas TG in the mixed gas is adjusted to be equal to or lower than the lower explosion limit. This makes it possible to prevent the test gas TG from exploding in the treatment part 35 even when the second shielding gas and the test gas TG are supplied to the treatment part 35 in a mixed state.

[0045] Furthermore, as described above, when the second shield gas is supplied, it is desirable to provide a second shield gas suction unit 55 that suctions only the second shield gas so that the suction unit 31 of the gas suction unit 30 suctions only the test gas TG. That is, it is desirable to connect the second shield gas suction mechanism 57 to the second shield gas suction unit 55 via a recovery pipe 56, and to suction the second shield gas from the second shield gas suction unit 55 to the second shield gas suction mechanism 57. By suctioning the test gas TG and the second shield gas separately in this manner, the suctioned test gas TG and second shield gas can be easily reused for testing. That is, it becomes possible to supply the suctioned test gas TG and second shield gas again from the test gas outlet 21 and the second shield gas outlet 51 to the testing space 10h of the device main body 10.

[0046] For example, as shown in FIG. 6(B), when the second shielding gas ejection part 51 is a circular slit, the second shielding gas suction part 55 is a circular slit located vertically above the second shielding gas ejection part 51 and having the same diameter as the second shielding gas ejection part 51 (FIG. 6(A)). The flow rate at which the suction part 31 sucks the test gas TG and the flow rate at which the second shielding gas suction part 55 sucks the second shielding gas are set to be approximately the same. This makes it easier to form the second air curtain AC2 while the suction part 31 sucks only the test gas TG and the second shielding gas suction part 55 sucks only the second shielding gas. Alternatively, for example, the second shielding gas suction part 55 may be formed by providing a plurality of suction ports surrounding the suction part 31.

[0047] Furthermore, if the flow rate at which the suction unit 31 suctions the test gas TG and the shield gas suction unit 55 suctions are set to be approximately the same, the suctioned test gas TG and shield gas can be easily reused for testing. On the other hand, the flow rate at which the suction unit 31 suctions may be set to be greater than the flow rate at which the second shield gas suction unit 55 suctions, or the flow rate at which the second shield gas suction unit 55 suctions may be set to be greater than the flow rate at which the suction unit 31 suctions. In the former case, the effect of preventing leakage of the test gas TG can be enhanced, and in the latter case, the possibility that the gas suctioned by the suction unit 31 contains the shield gas can be reduced, making it easier to reuse the test gas TG.

[0048] The second shielding gas supply unit 50 can have substantially the same configuration as the shielding gas supply unit 40. That is, although the shapes of the second shielding gas ejection unit 51 and the second shielding gas suction unit 55 and the locations where they are provided in the device body 10 are different from those of the shielding gas ejection unit 41 and the shielding gas suction unit 45 of the shielding gas supply unit 40, the second shielding gas supply unit 50 and the shielding gas supply unit 40 can have substantially the same configuration in other respects.

[0049] Furthermore, the second shielding gas supplied by the second shielding gas supply unit 50 may be the same as the shielding gas supplied by the shielding gas supply unit 40. In this case, the second shielding gas supply mechanism 53 and the second shielding gas suction mechanism 57 of the second shielding gas supply unit 50 may be common to the shielding gas supply mechanism 43 and the shielding gas suction mechanism of the shielding gas supply unit 40. In this case, the pipes 41 and the like connected to the shielding gas ejection unit 41, the shielding gas suction unit 45, the second shielding gas ejection unit 51, and the second shielding gas suction unit 55, respectively, are provided with flow rate regulators for adjusting the flow rates. Thus, even if the flow rate of the shielding gas (second shielding gas) supplied from the shielding gas supply mechanism 43 (second shielding gas supply mechanism 53) and the flow rate of the gas sucked by the shielding gas suction mechanism 47 (second shielding gas suction mechanism 57) are constant, the flow rates of the shielding gas (second shielding gas) ejected from the shielding gas ejection part 41 and the second shielding gas ejection part 51 can be individually adjusted, and the flow rates of the gas sucked from the shielding gas suction part 46 and the second shielding gas suction part 46 can be individually adjusted. In other words, the supply of the shielding gas (second shielding gas) and the suction of the gas can be performed in the same way as when the shielding gas supply part 40 and the second shielding gas supply part 50 are separately provided. [Industrial Applicability]

[0050] The gas leak testing device of the present invention is suitable as a device for adjusting the testing accuracy of a gas leak testing device in a location where testing using the test target gas is not possible (or is prohibited). [Explanation of symbols]

[0051] 1. Gas leak experiment equipment 10. Device body 10h Inspection space 13 Side wall 13h Communication window 20 Test gas supply section 21 Test gas outlet 22 Supply piping 23 Test gas supply mechanism 30 Gas suction section 31 Suction part 32 Recovery piping 33 Processing section 40 Shielding gas supply unit 50 Second shielding gas supply section 51 Second shielding gas outlet 55 Second shielding gas suction section 100 Gas leak detection device TG test gas AC1 First Air Curtain AC2 Second Air Curtain

Claims

1. An experimental device used to adjust the inspection accuracy of a gas leak inspection device that detects gas from a position remote from the inspection site, an apparatus body having an internal test space to which a test gas is supplied, and communication windows provided on opposing side walls for communicating between the inside of the test space and the outside; a test gas supply unit that supplies the test gas to the device body; a gas suction unit that suctions gas from the testing space; a shielding gas supply unit that supplies a shielding gas to each communication window to isolate the inspection space from the outside, thereby forming an air curtain at each communication window. A gas leak experiment device characterized by:

2. The bottom of the device body is a test gas outlet that supplies the test gas into the testing space; Between the gas outlet and the side wall of the device body, a second shielding gas outlet that injects a second shielding gas is provided so as to surround the test gas outlet.

2. The gas leak testing device according to claim 1.

3. The upper part of the device body is a test gas suction portion of the gas suction portion that suctions the test gas; a second shielding gas suction section that sucks the second shielding gas ejected from the second gas ejection section is provided between the test gas suction section of the gas suction section and a side wall of the device body; 3. The gas leak testing device according to claim 2.

4. The gas suction unit is a processing unit for processing the test gas sucked from the testing space, The processing unit The test gas is provided with a detoxification function for detoxifying the test gas or a storage function for storing the test gas.

2. The gas leak testing device according to claim 1.

5. The test gas supply unit includes: a supply pipe communicating between the test space and a test gas supply mechanism that supplies the test gas to the test space; and / or The gas suction unit is A recovery pipe is provided to connect the test space with a treatment section that treats the test gas sucked from the test space.

2. The gas leak testing device according to claim 1.

6. A method for adjusting the inspection accuracy of a gas leak inspection device that detects gas from a position remote from an inspection location, comprising: The gas leak testing device according to any one of claims 1 to 5 is installed in an inspection area within an explosion-proof area, The gas leak inspection device is installed outside the explosion-proof area so that the inspection space can be inspected through a communication window in the main body of the gas leak testing device. A gas leak experiment method characterized by the above.

7. The gas suction unit is a recovery pipe communicating between the testing space and a treatment section that treats the test gas sucked from the testing space; The experiment is carried out with the processing unit installed outside the explosion-proof area.

7. The gas leakage testing method according to claim 6.

8. The test gas supply unit includes: a supply pipe communicating between the testing space and a gas supply unit that supplies the test gas; The gas supply unit is installed outside the explosion-proof area.

7. The gas leakage testing method according to claim 6.

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