Hydrogen embrittlement testing equipment equipped with a heat exchanger

Abstract

The present invention relates to a hydrogen embrittlement testing apparatus with a heat exchanger for testing stress corrosion cracking of specimens due to hydrogen embrittlement. A hydrogen embrittlement testing apparatus with a heat exchanger according to an embodiment of the present invention includes a test chamber into which hydrogen is supplied to a test space formed therein, a fixing jig for fixing a specimen carried into the test chamber, a pulling rod for pulling the specimen fixed to the fixing jig, and a heat exchanger installed inside the test chamber to exchange heat between the hydrogen supplied into the test chamber and a heat medium to control the temperature of the hydrogen. Therefore, heat exchange of hydrogen can be performed quickly, improving heat exchange performance.

Description

[Technical Field]

[0001] The present invention relates to a hydrogen embrittlement testing device equipped with a heat exchanger for testing specimens for stress corrosion cracking due to hydrogen embrittlement. [Background technology]

[0002] Generally, when metals are subjected to tensile stress in a corrosive environment, cracks occur without plastic deformation. This phenomenon is called stress corrosion cracking.

[0003] Stress corrosion cracking is largely classified into corrosion caused by hydrogen embrittlement and active stress corrosion, which occurs when residual or applied stress causes deformation of the metal.

[0004] Active stress corrosion occurs due to the characteristics of the tissue, so when conducting active stress corrosion tests, the test specimen can be tested while exposed to the atmosphere, but hydrogen embrittlement must be tested in a hydrogen atmosphere, so the test must be conducted in a hydrogen chamber.

[0005] A device for testing hydrogen embrittlement has previously been disclosed in Korean Patent Publication No. 10-2154632 (published on September 10, 2020) as a "Metal Hydrogen Embrittlement Testing Device."

[0006] The above-mentioned conventional metal hydrogen embrittlement testing apparatus includes a housing having a circular space formed therein and open to one side and an installation hole formed at the bottom; a specimen fixing member configured to fix one end of a metal test specimen to the housing, the one end of the specimen fixing member being fixedly connected to the installation hole with the one end located in the space and the other end located outside the housing; a piston configured to fix the other end of the metal test specimen in an area facing the specimen fixing member and movably installed in the space; a cover member connected to the housing to close the space; and a connecting member having one end airtightly connected to the piston through the cover member and the other end located outside the cover member and connected to a tensile tester. The other end of the connecting member is connected to one side of the tensile tester, or the other end of the connecting member is connected to one side of the tensile tester and the other end of the specimen fixing member is connected to the other side of the tensile tester, and hydrogen is supplied to the space to perform a tensile test on the metal test specimen in a hydrogen atmosphere.

[0007] In a conventional metal hydrogen embrittlement testing device with this configuration, a metal test specimen is placed inside the housing, and high-pressure hydrogen is supplied to the space inside the housing, and the metal test specimen is pulled, thereby measuring changes in the metal's properties in a hydrogen atmosphere.

[0008] However, conventional metal hydrogen embrittlement testing devices supply a heat transfer medium to the housing to adjust the hydrogen temperature, which reduces the heat insulation from the outside and reduces the heat exchange efficiency of the hydrogen. In addition, since the heat transfer medium must exchange heat with the entire housing, it is difficult to quickly adjust the hydrogen temperature.

[0009] Furthermore, since hydrogen is injected into the housing, there is a problem that hydrogen leakage occurs when hydrogen embrittlement occurs in the housing.

[0010] Furthermore, since the fixing jig is installed on a separate frame, the size of the equipment increases due to the frame, which necessitates a large installation space. [Prior art documents] [Patent documents]

[0011] [Patent Document 1] Republic of Korea Patent Registration No. 10-2154632 (Announced September 10, 2020) Summary of the Invention [Problem to be solved by the invention]

[0012] The present invention has been devised to solve the above-mentioned problems, and an object of the present invention is to provide a hydrogen embrittlement testing device equipped with a heat exchanger that is installed inside a test chamber to exchange heat with hydrogen, thereby making it possible to easily adjust the temperature of hydrogen filled in the test chamber and minimize heat loss to improve heat exchange performance.

[0013] Another object of the present invention is to provide a hydrogen embrittlement testing device equipped with a heat exchanger, which is manufactured by forming flow paths in the heat exchanger plates, stacking multiple heat exchanger plates, and diffusion bonding them together. This not only minimizes the size of the heat exchanger, but also allows the heat exchanger to be easily manufactured in a shape that provides optimal heat exchange efficiency.

[0014] Another object of the present invention is to provide a hydrogen embrittlement testing device equipped with a heat exchanger that can minimize the installation space by minimizing the volume, since the rod support section is configured to support the fixing jig in the test chamber, and therefore there is no need to install a frame to support the fixing jig.

[0015] Another object of the present invention is to provide a hydrogen embrittlement testing device equipped with a heat exchanger that not only prevents hydrogen leakage by installing a test chamber inside an external vessel, but also prevents damage to the external vessel due to hydrogen embrittlement by installing an internal liner made of a material that is resistant to hydrogen embrittlement inside the external vessel. [Means for solving the problem]

[0016] To achieve the above object, a hydrogen embrittlement testing device with a heat exchanger according to an embodiment of the present invention includes a test chamber into which hydrogen is supplied to a test space formed therein, a fixing jig for fixing a specimen carried into the test chamber, a pulling rod for pulling the specimen fixed to the fixing jig, and a heat exchanger installed inside the test chamber to exchange heat between the hydrogen supplied into the test chamber and a heat medium to adjust the temperature of the hydrogen, and to exchange heat between the hydrogen and the heat medium.

[0017] The heat exchanger may have a heat exchange plate having a passage through which the heat medium passes formed by grinding or etching, and a plurality of the heat exchange plates may be stacked and diffusion bonded.

[0018] The heat exchange plate may include heat exchange fins protruding outward to improve heat exchange with the hydrogen.

[0019] The heat exchanger may have an overall circular shape to be accommodated in the test space, and the flow path and the heat exchange plate may be formed in a zigzag shape along the circumferential direction inside the test space to form an overall circular shape.

[0020] The hydrogen supply system may include an external vessel that can withstand the pressure of the hydrogen so as to supply the hydrogen at a predetermined pressure and that houses the test chamber to prevent the hydrogen supplied to the test chamber from leaking to the outside.

[0021] The outer vessel may include an inner liner that is resistant to hydrogen embrittlement and overlaps the inner circumferential surface of the outer vessel to prevent the outer vessel from being damaged by hydrogen embrittlement.

[0022] The test chamber may include a heat insulating material surrounding the test space to insulate the test space.

[0023] The test chamber may include a rod support for supporting the fixture in the test chamber.

[0024] The test chamber may include a port penetrating a side surface thereof and communicating with the test space, for transferring a test specimen into and out of the test chamber. [Effects of the Invention]

[0025] According to the present invention, a heat exchanger through which a heat medium passes is installed inside the test chamber, which not only allows for rapid heat exchange with hydrogen filled in the test space to quickly adjust the temperature of the hydrogen, but also minimizes heat loss and improves heat exchange performance because heat exchange is performed inside the test space.

[0026] In addition, the heat exchanger is constructed by stacking multiple heat exchange plates with flow paths and then diffusion bonding them, which minimizes the size of the heat exchanger and allows it to be installed inside the test chamber. It can also be easily manufactured into a shape that can provide optimal heat exchange performance in the test space, improving heat exchange performance.

[0027] In addition, an outer vessel is installed outside the test chamber to prevent the hydrogen supplied to the test space from leaking out, and an inner liner is installed inside the outer vessel to prevent damage to the outer vessel due to hydrogen embrittlement.

[0028] In addition, since the fixing jig is supported by the rod support of the test chamber, there is no need to install a separate frame for supporting the fixing jig, which minimizes the volume of the equipment and the installation space. [Brief explanation of the drawings]

[0029] [Figure 1] FIG. 1 is an exploded perspective view of a hydrogen embrittlement testing device equipped with a heat exchanger according to an embodiment of the present invention. [Figure 2]FIG. 1 is an exploded perspective view of a test chamber constituting a hydrogen embrittlement testing device equipped with a heat exchanger according to an embodiment of the present invention. [Figure 3] 1 is a side cross-sectional view of a hydrogen embrittlement testing device equipped with a heat exchanger according to an embodiment of the present invention. [Figure 4] FIG. 1 is a perspective view showing a heat exchanger constituting a hydrogen embrittlement testing device equipped with a heat exchanger according to an embodiment of the present invention. [Figure 5] FIG. 2 is a plan view showing a heat exchange plate of a heat exchanger constituting a hydrogen embrittlement testing device equipped with a heat exchanger according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0030] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0031] As shown in FIGS. 1-3, a hydrogen embrittlement testing apparatus 100 with a heat exchanger according to an embodiment of the present invention can include a test chamber 110.

[0032] The test chamber 110 may be formed with a test space 111 for accommodating a specimen so that a hydrogen embrittlement test can be carried out using a specimen of a predetermined size.

[0033] Here, the hydrogen embrittlement tester may be a device that tests changes in a specimen due to hydrogen embrittlement by pulling the specimen under a hydrogen environment and observing the deformation of the specimen. The hydrogen embrittlement test may be a slow strain rate test (SSRT) or a constant elongation rate test (CERT).

[0034] The test chamber 110 is formed in a hollow cylindrical shape, and an inlet / outlet port 113 through which the test specimen can be introduced and removed may be formed on one or both sides of the periphery of the test chamber 110 so as to communicate with the test space.

[0035] The test chamber 110 may have a configuration in which an upper crown, a lower crown, and a column supporting the upper and lower crowns of the press device are integrally formed.

[0036] A rod support portion 119 may be configured at the top of the test chamber 110, on which a fixing jig 130 to which a test specimen (described later) is fixed is installed so that it passes through the test chamber 110 from the top of the test chamber 110 and is positioned in the test space 111.

[0037] The rod support portion 119 may include a support boss 119a and a boss plate 119b, and multiple support bosses 119a may be erected on the top of the test chamber 110, and the boss plate 119b may be coupled to the top of the multiple support bosses 119a to connect the multiple support bosses 119a.

[0038] Here, the center of the boss plate 119b may be perforated so that the fixing jig 130 can be inserted into the test space 111 through the upper rod hole 115 and positioned therein.

[0039] An upper rod hole 115 is formed at the top of the test chamber 110 so that a fixing jig 130 can pass through from a rod support part 119 located at the top of the test chamber 110 to be positioned in the test space 111, and a lower rod hole 117 may be formed at the bottom of the test chamber 110 so that a tensile rod 140 (described later) can extend into or retract into the test space 111 to apply or release a tensile force to the test specimen.

[0040] The test chamber 110 can be made of a material that is highly resistant to hydrogen embrittlement, such as stainless steel, aluminum, titanium, austenite, martensite, or the like, or any of these metal materials, or an alloy containing these metal materials, or a synthetic resin.

[0041] As shown in FIGS. 1-3, a hydrogen embrittlement testing apparatus 100 with a heat exchanger according to an embodiment of the present invention can include a thermal insulator 120 .

[0042] The insulating material 120 can insulate the interior of the test space 111 from the outside in order to maintain a constant internal temperature of the test space 111 .

[0043] Insulation 120 may surround and insulate the test space 111 .

[0044] The heat insulating material 120 may be combined into a plurality of divided pieces to surround the test space 111 .

[0045] For example, the insulation 120 includes side insulation 121, lower insulation 125, and upper insulation 123. Multiple side insulations 120 are connected together to surround the periphery of the test space 111, the upper insulation 123 seals the open upper part of the test space 111 surrounded by the side insulation 121, and the lower insulation 125 seals the open lower part of the test space 111 surrounded by the side insulation 121.

[0046] Here, the side insulation material 121 not only insulates the inner periphery of the test space 111, but also seals the loading / unloading entrance 113 that penetrates the periphery of the test chamber 110, thereby completely insulating the test chamber 110 from the outside.

[0047] Of course, the side insulation 121 located at the loading / unloading port 113 can be removably coupled to the test chamber 110 so that specimens can be loaded into or unloaded from the test space 111 through the loading / unloading port 113.

[0048] The upper insulation material 123 and the lower insulation material 125 are each configured in two halves, left and right, and the two halves of the upper insulation material 123 can be combined to insulate the upper part of the test space 111, and the two halves of the lower insulation material 125 can be combined to insulate the lower part of the test space 111.

[0049] The heat insulating material 120 can be made of a material such as a metal having excellent heat insulating properties, or a synthetic resin having heat insulating properties and resistance to hydrogen embrittlement.

[0050] As shown in FIGS. 1 to 3, a hydrogen embrittlement testing apparatus 100 equipped with a heat exchanger according to an embodiment of the present invention may include a fixture jig 130 and a tensile rod 140 .

[0051] The fixing jig 130 can fix the test specimen. The fixing jig 130 is located in the test space 111 and includes a fixing rod 131. The fixing jig 130 is installed at one end of the fixing rod 131 and is located in the test space 111, and the other end of the fixing rod 131 may pass through the upper rod hole 115 of the test chamber 110 and the boss plate 119b and be positioned to protrude above the boss plate 119b.

[0052] The fixing jig 130 may further include a rod adjustment member 133 .

[0053] The rod adjustment member 133 is installed at the end of the fixed rod 131 that passes through the support plate, and the height of the fixed jig 130 within the test space 111 can be adjusted by adjusting the height of the fixed rod 131 with the support plate.

[0054] A screw thread is formed on the other end of the fixed rod 131, and the rod adjustment member 133 is connected to the screw thread so that it can be threadedly engaged. Therefore, by rotating the rod adjustment member 133 relative to the fixed rod 131, the height of the fixed jig 130 in the test space 111 can be adjusted so that the fixed rod 131 moves vertically through the screw engagement.

[0055] Here, since the fixing jig 130 is supported by the rod support 119 at the top of the test chamber 110, there is no need to install a separate frame to support the fixing jig 130, and therefore the volume of the test apparatus can be minimized.

[0056] The tensile rod 140 passes through the lower rod hole 117 of the test chamber 110 , and one end of the tensile rod 140 is positioned in the test space 111 facing the fixed jig 130 , and the other end can be positioned at the bottom of the test chamber 110 .

[0057] The tension rod 140 can be moved up and down in the test space 111 by a tension mechanism such as a pneumatic or hydraulic cylinder, and the tension rod 140 can pull the specimen connected to the fixed jig 130 to perform a hydrogen embrittlement test.

[0058] A tension jig 141 corresponding to the fixing jig 130 is installed at one end of a tension rod 140 located in the test space 111 to firmly hold the test specimen.

[0059] For example, one end of the specimen is fixed to the fixing jig 130, the other end is fixed by the tension jig 141, and the specimen is pulled by gradually pulling the tension rod 140 downward by the tension mechanism, thereby performing a hydrogen embrittlement test.

[0060] The fixed rod 131 and the pulling rod 140 can be realized by various known types of jigs that can grip and firmly fix the specimen.

[0061] As shown in FIGS. 3 to 5, a hydrogen embrittlement testing apparatus 100 equipped with a heat exchanger according to an embodiment of the present invention may include a heat exchanger 150 .

[0062] The heat exchanger 150 exchanges the heat of the hydrogen supplied to the inside of the test chamber 110 with the heat of the heat medium to adjust the temperature of the hydrogen or to maintain a uniform temperature of the hydrogen while the hydrogen embrittlement test is being performed.

[0063] The heat exchanger 150 is located in the test space 111 and is capable of exchanging heat with hydrogen in the test space 111, and a heat medium can be supplied to the heat exchanger 150 for exchanging heat with hydrogen.

[0064] In a typical hydrogen embrittlement testing device, the heat exchanger 150 is located outside the test chamber 110, and the hydrogen is transported into the test chamber 110 after heat exchange with the hydrogen. As the heat-exchanged hydrogen moves through the piping to the test chamber 110, the temperature of the hydrogen changes as it exchanges heat with the outside, making it difficult to maintain a uniform temperature of the hydrogen. In addition, heat is lost during the movement, reducing the heat exchange efficiency, and the temperature of the hydrogen cannot be changed quickly.

[0065] However, in the present invention, the heat exchanger 150 is located inside the test chamber 110, so the hydrogen can be immediately heat exchanged, minimizing heat loss and quickly exchanging the heat of the hydrogen.

[0066] The heat transfer medium can be a fluid or a gas.

[0067] The heat exchanger 150 may be formed with a medium supply port 151d for supplying a heat medium and a medium discharge port 151e for discharging the heat medium after heat exchange. The heat exchanger 150 may be a printed circuit heat exchanger (PCHE) in which a plurality of heat exchange plates 151 are stacked and diffusion bonded after forming flow paths 151a through which the heat medium passes through by etching or polishing.

[0068] Here, diffusion bonding is a method in which multiple heat exchange plates 151 are stacked and pressed together at a predetermined pressure, using atomic diffusion at the bonding surface to bond them together, thereby improving the bondability between the heat exchange plates 151 and preventing leakage of the heat medium.

[0069] Of course, the heat exchange plates 151 can be not only joined to each other by diffusion bonding, but also fixed by passing fixing pins through the heat exchange plates 151 and fastening nuts to the ends of the fixing pins, thereby preventing the heat exchange plates 151 from separating from each other.

[0070] Furthermore, when the heat exchanger 150 is embodied as a printed circuit heat exchanger (PCHE), it can be easily manufactured in a desired shape and size, and therefore, even small equipment such as the hydrogen embrittlement testing device 100 equipped with the heat exchanger of the embodiment can be miniaturized and installed.

[0071] The heat exchanger 150 has a medium supply pipe 153 connected to the medium supply port 151d and a medium discharge pipe 155 connected to the medium discharge port 151e, so that a heat medium can be supplied to the heat exchanger 150 from outside the test chamber 110 and the supplied heat medium can be discharged to the outside of the test chamber 110.

[0072] Here, a medium pipe hole 163 through which the medium discharge pipe 155 and the medium supply pipe 153 are installed may be provided at the bottom of the test chamber 110 .

[0073] The heat exchanger 150 is located above the test space 111, and a through-hole 151c may be formed in the center of the heat exchanger 150 so that the fixed rod 131 can pass through.

[0074] The heat exchange plate 151 of the heat exchanger 150 may be provided with a plurality of heat exchange fins 151b in a protruding manner in order to improve heat exchange with the outside.

[0075] Alternatively, the heat exchanger 150 may be formed in a generally cylindrical shape corresponding to the periphery of the test space 111 .

[0076] The flow passages 151a formed in the heat exchange plate 151 are formed in a zigzag shape to improve heat exchange performance. In this embodiment, not only the flow passages 151a but also the shape of the heat exchange plate 151 is formed in a circular shape overall so that the zigzag shape is formed in the circumferential direction around the through-hole 151c formed in the center, thereby improving the heat exchange efficiency of the heat exchanger 150.

[0077] For example, the heat exchange plate 151 may be formed in a zigzag circular shape along the circumferential direction, and flow paths 151a may be formed along the zigzag shape of the heat exchange plate 151, thereby minimizing the contact distance between the flow paths 151a through which the heat medium passes and the hydrogen for heat exchange, thereby improving heat exchange performance.

[0078] Here, the heat exchange fins 151b protrude from both sides of the heat exchange plate 151 formed in a zigzag shape, and a plurality of heat exchange fins 151b may be formed along the shape of the heat exchange plate 151 formed in a zigzag shape.

[0079] A medium supply port 151d through which a heat medium is supplied is formed on one side of the heat exchange plate 151, and a medium discharge port 151e is formed on the opposite side of the medium supply port 151d. Therefore, the heat medium supplied to the medium supply port 151d is divided into two on both sides of the circumference and discharged through the medium discharge port 151e located on the opposite side through the zigzag flow path 151a.

[0080] As shown in FIGS. 1 and 3, a hydrogen embrittlement testing apparatus 100 with a heat exchanger according to an embodiment of the present invention may include an outer vessel 170 and an inner liner 175 .

[0081] The outer vessel 170 is formed in the form of a container and is capable of housing the test chamber 110 therein.

[0082] The outer vessel 170 can prevent hydrogen from leaking out from the test chamber 110. The outer vessel 170 can be formed in the shape of a container with an open bottom.

[0083] The upper part of the inner surface of the outer vessel 170 is formed into a curved surface that bulges upward, so that the hydrogen pressure acts evenly, preventing damage to the outer vessel 170 due to pressure being concentrated in one area.

[0084] The outer vessel 170 may have a relatively large thickness to withstand the pressure of the hydrogen supplied for the hydrogen embrittlement test.

[0085] The inner peripheral surface of the lower portion of the outer vessel 170 may be formed with a thread for screwing and fixing the vessel cap 160 thereto.

[0086] The outer vessel 170 is installed so as to be movable up and down by a driving mechanism. Therefore, when a specimen is to be loaded into or unloaded from the test chamber 110, the outer vessel 170 can be lifted upward to expose the test chamber 110 to the outside, or can be moved downward while the test chamber 110 is lifted upward to accommodate the test chamber 110.

[0087] The inner liner 175 has a container shape corresponding to the inner peripheral surface of the outer vessel 170, and is inserted or joined closely to the inner peripheral surface of the outer vessel 170. The inner liner 175 may be formed of a material resistant to hydrogen embrittlement to prevent damage to the outer vessel 170 due to hydrogen embrittlement.

[0088] Of course, the inner liner 175 may be configured not in the form of a container, but by coating the inside of the outer vessel 170 with a hydrogen embrittlement resistant material.

[0089] As shown in FIGS. 1-3, a hydrogen embrittlement testing apparatus 100 with a heat exchanger according to an embodiment of the present invention can include a vessel cap 160.

[0090] The vessel cap 160 can seal the open bottom of the outer vessel 170 .

[0091] The test chamber 110 is seated on top of the vessel cap 160, and a fastening cap 165 for rotating the vessel cap 160 to attach and detach it is rotatably installed around the vessel cap 160, and the outer surface of the fastening cap 165 may be formed with a screw thread that screws into a screw thread formed on the inner surface of the lower part of the outer vessel 170.

[0092] The vessel cap 160 has a cap rod hole 161 through which a pulling rod 140, which moves up and down by a pulling mechanism located at the bottom of the vessel cap 160, passes, and around the cap rod hole 161, medium pipe holes 163 through which a medium supply pipe 153 and a medium discharge pipe 155 pass may be formed.

[0093] In addition, the vessel cap 160 may be provided with a hydrogen pipe hole 164 through which a hydrogen supply pipe 181 for supplying hydrogen to the test space 111 and a hydrogen discharge pipe 183 for discharging the supplied hydrogen pass.

[0094] When the vessel cap 160 seals the outer vessel 170, a vessel seal is installed at the portion of the vessel cap 160 where the vessel cap 160 and the outer vessel 170 overlap to prevent hydrogen from leaking between the outer vessel 170 and the vessel cap 160. A pressure seal may be installed in the cap rod hole 161, into which the pulling rod 140 that moves up and down in the vessel cap 160 is inserted, to airtightly seal the pulling rod 140 and the cap rod hole 161.

[0095] Of course, a cap seal can also be installed between the vessel cap 160 and the rotating fastening cap 165 to prevent hydrogen from leaking out.

[0096] Here, the vessel seal, cap seal and pressure seal are made of a material that is resistant to hydrogen embrittlement, and may be made of a material that has elasticity or a metal.

[0097] As shown in FIGS. 1 to 3, a hydrogen embrittlement testing device 100 equipped with a heat exchanger according to an embodiment of the present invention may include a hydrogen supply pipe 181 and a hydrogen discharge pipe 183 .

[0098] The hydrogen supply pipe 181 can supply hydrogen to the test space 111 so that hydrogen embrittlement occurs in the specimen.

[0099] A plurality of hydrogen supply pipes 181 may be positioned protruding into the test space 111 through the hydrogen pipe holes 164 of the vessel cap 160 .

[0100] Here, the hydrogen supply pipe 181 vertically penetrates the side insulation 121 to prevent the hydrogen supply pipe 181 from being exposed to the test space 111, and a communication hole communicating with the test space 111 is formed in the side insulation 121, so that hydrogen supplied to the hydrogen supply pipe 181 can be provided to the test space 111 through the communication hole.

[0101] The hydrogen discharge pipe 183 can discharge the hydrogen supplied to the test space 111 to the outside of the external vessel 170 when the hydrogen embrittlement test is completed. One end of the hydrogen discharge pipe 183 is located in the internal space of the external vessel 170, and the other end of the hydrogen discharge pipe 183 is connected to an external hydrogen tank through the hydrogen pipe hole 164 of the vessel cap 160, so that the hydrogen supplied to the test space 111 can be collected into the hydrogen tank through the external vessel 170.

[0102] Of course, the hydrogen discharge pipe 183 passing through the vessel cap 160 may also pass through the side heat insulating material 121 and have one end located in the internal space of the outer vessel 170 .

[0103] The functions and effects of each of the above-described configurations will now be described.

[0104] The hydrogen embrittlement testing device 100 equipped with a heat exchanger according to an embodiment of the present invention has a test space 111 formed inside a test chamber 110 for testing the hydrogen embrittlement of a specimen, and a transfer port 113 penetrating the periphery of the test chamber 110 for transferring the specimen into or out of the test space 111.

[0105] The test space 111 of the test chamber 110 can be insulated by the insulation material 120, and the insulation material 120 insulates the test space 111 in a manner in which the insulation material 120 is composed of an upper insulation material 123 that insulates the upper part of the test chamber 110, a side insulation material 121 that is assembled in multiple pieces to insulate the periphery of the test chamber 110, and a lower insulation material 125 that insulates the lower part of the test chamber 110, which are assembled together.

[0106] Here, the side insulation 121 corresponding to the loading / unloading entrance 113 of the test chamber 110 can be detachably coupled to the loading / unloading entrance 113 so as to open and close the test space 111 .

[0107] Meanwhile, a rod support part 119 for fixing a fixing jig 130 for fixing a test piece is formed on the upper part of the test chamber 110, and the rod support part 119 is formed by connecting a boss plate 119b to a plurality of support bosses 119a.

[0108] The fixing jig 130 is located inside the test space 111, and one end of a fixing rod 131 is connected to the fixing jig 130, and the other end of the fixing rod 131 is positioned by passing through the upper rod hole 115 of the test chamber 110 and the boss plate 119b, and a rod adjustment member 133 is connected to the end of the fixing rod 131 that passes through the boss plate 119b, which adjusts the position of the fixing rod 131 within the test space 111 by screwing onto the fixing rod 131 and rotating.

[0109] At the bottom of the test chamber 110, a tensile rod 140 for applying tensile force to the specimen for testing is positioned in the test space 111 through the lower rod hole 117 of the test chamber 110, and a tensile jig 141 for fixing the specimen together with the fixing jig 130 is installed at the end of the tensile rod 140 located in the test space 111.

[0110] A tension mechanism is connected to the end of the tension rod 140 opposite to the end to which the tension jig 141 is connected, for applying a tension force to the tension rod 140 to tension the specimen.

[0111] A heat exchanger 150 is installed in the test space 111 to exchange heat between the hydrogen supplied to the test space 111 and the heat of the heat medium. The heat exchanger 150 is constructed by stacking a plurality of heat exchange plates 151, each having a flow passage 151a formed by etching or polishing, and bonding the stacked plates by diffusion bonding.

[0112] The heat exchange plate 151 has a circular shape, with a medium supply port 151d formed on one side of the circumference for supplying a heat medium and a medium discharge port 151e formed on the other side for discharging the heat medium. The heat exchange plate 151 is formed in a zigzag shape along the circumferential direction from the medium supply port 151d to the medium discharge port 151e.

[0113] The zigzag-shaped heat exchange plate 151 also has flow paths 151a formed in a zigzag shape in the circumferential direction along the shape of the heat exchange plate 151, and heat exchange fins 151b are protruded along the zigzag shape of the heat exchange plate 151 to increase the contact area in order to improve heat exchange with hydrogen.

[0114] In the heat exchanger 150, a medium supply pipe 153 for supplying a heat medium is extended below the medium supply port 151d, and a medium discharge pipe 155 through which the heat medium supplied to the heat exchanger 150 is discharged after heat exchange is extended below the medium discharge port 151e.

[0115] The test chamber 110 is inserted into an outer vessel 170 that is open at the bottom, and an inner liner 175 is installed on the inner periphery of the outer vessel 170 to prevent hydrogen embrittlement of the outer vessel 170.

[0116] The open bottom of the outer vessel 170 is sealed by the vessel cap 160, and a fastening cap 165 is rotatably coupled to the vessel cap 160. The fastening cap 165 is coupled to a thread formed on the inner peripheral surface of the bottom of the outer vessel 170 in a manner of being screwed together.

[0117] A cap rod hole 161 is formed through the center of the vessel cap 160, and the pulling rod 140 is connected to the cap rod hole 161 so that it can slide up and down. A rod seal provides an airtight seal between the cap rod hole 161 and the pulling rod 140, and a cap seal also provides an airtight seal between the vessel cap 160 and the fastening cap 165.

[0118] The outer vessel 170 can be moved up and down by a driving mechanism to expose the test chamber 110 installed in the vessel cap 160 to the outside, or insert the test chamber 110 into the outer vessel 170 and seal it.

[0119] Meanwhile, each medium pipe hole 163 of the vessel cap 160 is located below and penetrates the medium supply pipe 153 and medium discharge pipe 155 of the heat exchanger 150. The medium supply pipe 153 is connected to a medium supply tank that supplies the heat medium, and the medium discharge pipe 155 is also connected to the medium supply tank. After the heat medium is heated or cooled, it can be circulated and supplied between the heat exchanger 150 and the medium supply tank.

[0120] Each hydrogen pipe hole 164 formed in the vessel cap 160 is connected to a hydrogen supply pipe 181 that supplies hydrogen from a hydrogen supply device to the test space 111 and a hydrogen discharge pipe 183 that discharges hydrogen supplied to the external vessel 170 to the outside.

[0121] The hydrogen supply pipe 181 can supply hydrogen stored in the hydrogen storage tank to the test space 111 up to a predetermined pressure using the pressure of the hydrogen supply pump, and when the hydrogen embrittlement test is completed with hydrogen supplied to the test space 111, the hydrogen supply pipe 181 can suck in hydrogen located inside the external vessel 170 using the hydrogen supply pump, circulate it to the hydrogen storage tank, and discharge it to prevent hydrogen leakage.

[0122] In the hydrogen embrittlement testing apparatus 100 having the heat exchanger according to the embodiment of the present invention configured as described above, the fastening cap 165 is rotated to release the connection between the outer vessel 170 and the vessel cap 160 so as to expose the test chamber 110 to the outside, and then the driving mechanism is operated to lift the outer vessel 170 upward.

[0123] When the outer vessel 170 is lifted upward to expose the test chamber 110 to the outside, the side insulation 121 closing the loading / unloading entrance 113 of the test chamber 110 is separated to open the test space 111, and then the test specimen is attached and installed between the fixing jig 130 and the tension jig 141 in order to open the loading / unloading entrance 113 of the test chamber 110.

[0124] Here, the rod adjustment member 133 located at the top of the test chamber 110 is rotated and screwed to adjust the height of the fixed rod 131 according to the length of the specimen, thereby adjusting the distance between the tension jig 141 and the fixed jig 130, and then the specimen can be placed between the fixed jig 130 and the tension jig 141.

[0125] Meanwhile, once the specimen is placed between the fixing jig 130 and the tensile jig 141, in order to insulate the test space 111, the loading / unloading entrance 113 of the test chamber 110 is covered and sealed with the side insulation material 121 that had been opening the entrance 113, and the outer vessel 170 is moved downward by the driving mechanism.

[0126] When the external vessel 170 moves downward, the test chamber 110 is inserted into the external vessel 170, and when the external vessel 170 is sealed by the vessel cap 160, the fastening cap 165 is rotated by the driving mechanism to fasten and fix the external vessel 170 and the vessel cap 160 together.

[0127] In this state, when hydrogen is supplied through the hydrogen supply pipe 181, the inside of the test chamber 110 is filled with hydrogen and the hydrogen is supplied to the test space 111 up to a predetermined pressure.

[0128] Here, even if hydrogen is supplied to the test space 111, the hydrogen is sealed by the outer vessel 170, so that the hydrogen can be prevented from leaking out, and since an inner liner 175 is installed inside the outer vessel 170, the occurrence of hydrogen embrittlement in the outer vessel 170 can be prevented.

[0129] When hydrogen is supplied to the test space 111, the hydrogen in the test chamber 110 is maintained at a uniform temperature, or if a change in the temperature of the hydrogen is required, a preheated or precooled heat medium is supplied to the medium supply pipe 153 and then to the medium supply port 151d of the heat exchanger 150.

[0130] The heat medium supplied to the medium supply port 151d passes through the flow path 151a of the heat exchange plate 151 and exchanges heat with hydrogen to change the temperature of the hydrogen, and then passes through the medium discharge port 151e of the heat exchange plate 151 and is discharged to the outside through the medium discharge pipe 155, thereby circulating and adjusting the temperature of the hydrogen.

[0131] Here, the heat exchange plate 151 is formed in a zigzag shape in the circumferential direction, and the flow paths 151a also extend in a zigzag shape in the circumferential direction along the shape of the heat exchange plate 151 to perform heat exchange. Heat exchange fins 151b are protruded from the periphery of the heat exchange plate 151 to increase the contact area and improve heat exchange performance, so that the heat medium can move in an optimal shape corresponding to the internal shape of the test chamber 110 and exchange heat.

[0132] In order to perform a hydrogen embrittlement test on the specimen while maintaining the temperature of the hydrogen uniform through the heat exchanger 150 or while varying the temperature of the hydrogen, a tension force is applied to the specimen by pulling the tension rod 140 downward through the tension mechanism.

[0133] The specimen is tested in such a manner that a tensile force is applied to the specimen and the change in the tensile force applied to the specimen due to hydrogen embrittlement is measured or observed.

[0134] When the hydrogen embrittlement test of the specimen is completed, the hydrogen supplied to the interior of the external vessel 170 is discharged to the outside of the external vessel 170 through the hydrogen discharge pipe 183 to prevent the hydrogen filled inside the external vessel 170 from leaking out. When the hydrogen discharge is complete, the fastening cap 165 is rotated by the driving mechanism to release the vessel cap 160 from the external vessel 170, and the external vessel 170 is lifted upward to expose the test chamber 110 to the outside. In this state, the side insulation 121 covering the loading / unloading port 113 is separated, and the specimen for which the test has been completed is removed, thereby completing the hydrogen embrittlement test of the specimen.

[0135] Of course, the test can also be carried out by observing the tissue of the specimen taken out after the test under a microscopic microscope.

[0136] Therefore, the hydrogen embrittlement test apparatus 100 equipped with a heat exchanger according to an embodiment of the present invention has a heat exchanger 150 installed inside the test chamber 110, and is able to uniformly maintain or change the temperature of the hydrogen filled inside the test chamber 110, thereby minimizing heat loss due to heat exchange and enabling the hydrogen embrittlement test to be performed while quickly adjusting the hydrogen temperature.

[0137] In addition, by forming a flow path 151a in the heat exchange plate 151 and stacking multiple plates and diffusion bonding them together to construct the heat exchanger 150, the volume of the heat exchanger 150 can be minimized, allowing the heat exchanger 150 to be installed inside the relatively small test space 111.In addition, the heat exchanger 151 can be easily manufactured in various shapes, allowing the heat exchanger 150 to be manufactured in a shape that has optimal heat exchange efficiency to match the shape of the test space 111.

[0138] In addition, since the rod support part 119 that supports the fixing jig 130 is configured on the upper part of the test chamber 110, there is no need to install an external frame to fix the fixing jig 130, so the size of the equipment can be minimized.

[0139] In addition, since the test chamber 110 is installed inside the outer vessel 170, it is possible to not only block the outflow of hydrogen but also supply hydrogen at high pressure, and by installing an inner liner 175 inside the outer vessel 170, it is possible to prevent the outer vessel 170 from being damaged due to hydrogen embrittlement.

[0140] Although the embodiments of the present invention have been described above, the scope of the present invention is not limited thereto, and includes all changes and modifications that can be easily modified from the embodiments of the present invention by a person skilled in the art in the technical field to which the present invention belongs and are recognized as equivalents. [Explanation of symbols]

[0141] 100 Hydrogen embrittlement testing equipment 110 Test Chamber 111 Test Space 113 Loading / unloading entrance 115 Upper rod hole 117 Lower rod hole 119 Rod support 119a Support Boss 119b boss plate 120 Insulation 121 Side insulation 123 Upper insulation 125 Lower insulation 130 Fixed Jig 131 Fixed rod 133 Rod adjustment member 140 Tensile Rod 141 Tensile Jig 150 Heat exchanger 151 Heat exchange plate 151a Channel 151b Heat exchange fin 151c Penetration 151d Media supply port 151e Media outlet 153 Medium supply pipe 155 Medium discharge pipe 160 Vessel Cap 161 Cap rod hole 163 Medium pipe hole 164 Hydrogen Pipe Hole 165 Fastening Cap 170 External Vessel 175 inner liner 181 Hydrogen supply pipe 183 Hydrogen Exhaust Pipe

Claims

1. a test chamber in which hydrogen is supplied to a test space formed therein; a fixing jig for fixing the specimen to be carried into the test chamber; a tension rod for pulling the specimen fixed to the fixing jig; a heat exchanger that is installed inside the test chamber so as to exchange heat between the hydrogen supplied to the inside of the test chamber and a heat medium to adjust the temperature of the hydrogen, and that exchanges heat between the hydrogen and the heat medium.

2. 2. The hydrogen embrittlement testing device equipped with a heat exchanger according to claim 1, wherein the heat exchanger has a flow path through which the heat medium passes formed by polishing or etching a heat exchange plate, and a plurality of the heat exchange plates are stacked and diffusion bonded.

3. 3. The hydrogen embrittlement testing device equipped with a heat exchanger according to claim 2, wherein the heat exchange plate includes heat exchange fins protruding outward to improve heat exchange with the hydrogen.

4. the heat exchanger has a generally circular configuration to be accommodated in the test space; 3. The hydrogen embrittlement testing device with a heat exchanger according to claim 2, wherein the flow path and the heat exchange plate are formed in a zigzag shape along the circumferential direction inside the test space to form an overall circular shape.

5. 2. A hydrogen embrittlement testing device equipped with a heat exchanger according to claim 1, further comprising an external vessel that withstands the pressure of the hydrogen so as to supply the hydrogen at a predetermined pressure and that houses the test chamber therein to block the hydrogen supplied to the test chamber from leaking to the outside.

6. 6. A hydrogen embrittlement testing device equipped with a heat exchanger according to claim 5, further comprising an inner liner that is resistant to hydrogen embrittlement to prevent the outer vessel from being damaged by hydrogen embrittlement and that overlaps the inner peripheral surface of the outer vessel.

7. 2. The hydrogen embrittlement testing device having the heat exchanger according to claim 1, further comprising a heat insulating material surrounding the periphery of the test space in the test chamber to insulate the test space.

8. The hydrogen embrittlement testing device equipped with a heat exchanger according to claim 1 , wherein the test chamber includes a rod support portion that supports the fixing jig in the test chamber.

9. 2. The hydrogen embrittlement testing device with a heat exchanger according to claim 1, wherein the test chamber includes a loading / unloading port formed through a side surface thereof and communicating with the test space for loading and unloading a test specimen into and from the inside of the test chamber.

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