KR102656783B1 - Apparatus for cryogenic test specimens - Google Patents

Abstract

A cryogenic test device according to an embodiment of the present invention includes a test room for testing specimens; A fixture located inside the test room and fixing the specimen; A refrigerator that penetrates the test room and cools the specimen by contacting the fixture; It may include a press unit that is coupled through the test room and reciprocates in the height direction toward the fixing unit to press the specimen.

Description

Cryogenic test equipment {APPARATUS FOR CRYOGENIC TEST SPECIMENS}

The present invention relates to cryogenic testing devices.

Metal materials have various physical properties such as toughness, ductility, brittleness, and rigidity, and low-temperature tests that measure these properties at low temperatures are also performed.

Here, since most brittle deformation occurs at low temperatures, tests are conducted at low temperatures to reflect the actual phenomenon.

In the case of a conventional low-temperature test device, the specimen temperature was lowered by cooling the specimen through a simple cooling method in which vaporized liquid nitrogen was sprayed around the specimen to cool it, and then the necessary tests were performed when the target temperature was reached.

However, the conventional low-temperature test device simply sprays vaporized liquid nitrogen only around the specimen, so the temperature at which it can cool the specimen is limited, and the vaporized liquid nitrogen is sprayed only around the specimen, preventing heat exchange with the specimen. There was a problem that it wasn't enough.

In addition, because the temperature of the specimen changes due to frictional heat generated as the specimen contacts the press section, there was a problem in that the test value could not be accurately measured.

Republic of Korea Patent Publication No. 10-2022-0158399 (published on December 1, 2022)

The present invention is intended to solve the above problems, and seeks to provide a cryogenic test device that conducts testing by cooling the specimen through a refrigerator.

In addition, the press unit further includes a first insulation member at a portion in contact with the specimen, so as to prevent the temperature of the specimen from changing due to frictional heat generated by contact between the specimen and the press unit.

In addition, the jig part further includes a second insulation member at the part in contact with the specimen, so as to prevent the temperature of the specimen from changing due to frictional heat generated by contact between the specimen and the jig part.

The problems to be solved by the present invention are not limited to the problems mentioned above, and other problems not mentioned can be clearly understood by those skilled in the art from the description below.

A cryogenic test device according to an embodiment of the present invention includes a test room for testing specimens; A fixture located inside the test room and fixing the specimen; A refrigerator that penetrates the test room and cools the specimen by contacting the fixture; It may include a press unit that is coupled through the test room and reciprocates in the height direction toward the fixing unit to press the specimen.

The refrigerator may include a first stage refrigerator that is in contact with the test room and cools the test room, and a second stage refrigerator that is in contact with the fixture and cools the specimen.

The fixing part includes a first clip part that fixes one side of the specimen; And it may include a second clip part for fixing the other side of the specimen.

The refrigerator may include a first refrigerator in contact with the first clip portion; And it may include a second refrigerator in contact with the second clip portion.

A portion of the specimen may be exposed between the first clip portion and the second clip portion.

The press unit may press the exposed portion of the specimen.

The press unit may include a first insulation member at a portion in contact with the specimen.

It may further include a jig part located at the lower part of the test room and protruding to support the fixing part or the specimen.

The jig portion may include a second insulation member at a portion that is in contact with the specimen.

The jig part may further include a third insulation member at a lower portion in contact with the test room.

It may further include a cover portion surrounding the test room and having a vacuum-treated gap between the test room and the test room.

The cover part may further include a heater part.

A first door may be formed at one end of the test room, and a second door may be formed on the cover at a position corresponding to the first door.

The cryogenic test device according to an embodiment of the present invention can cool the specimen to the cryogenic temperature desired by the user by directly cooling the specimen through a refrigerator.

In addition, the press unit may further include a first insulation member at a portion in contact with the specimen to prevent the temperature of the specimen from changing due to frictional heat generated when the specimen contacts the press unit.

In addition, the jig portion may further include a second insulation member at a portion in contact with the specimen to prevent the temperature of the specimen from changing due to frictional heat generated when the specimen and the jig portion are in contact.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description below.

1 is a diagram showing a cryogenic test device according to an embodiment of the present invention.
Figure 2 is an internal front view of a test room in a cryogenic test apparatus according to an embodiment of the present invention.
Figure 3 is an internal side view of a test room in a cryogenic test apparatus according to an embodiment of the present invention.

Below, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement the present invention. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, parts unrelated to the description are omitted, and similar parts are given similar reference numerals throughout the specification.

Throughout the specification, when a part "includes" a certain element, this means that it may further include other elements rather than excluding other elements, unless specifically stated to the contrary. In addition, when a part is said to be "connected" to another part throughout the specification, this means not only when it is directly connected, but also when it is connected through another member in the middle, or electrically between other elements in the middle. This also includes cases where they are connected. Furthermore, throughout the specification of the present application, when a member is said to be located “on” another member, this includes not only the case where a member is in contact with another member, but also the case where another member exists between the two members. Additionally, expressions such as “first,” “second,” and the like used in this specification may modify various components regardless of order and/or importance, and may be used to distinguish one component from another component. It is only used and does not limit the corresponding components, and does not necessarily mean other components. For example, 'first direction' and 'second direction' may mean the same direction or different directions.

Figure 1 is a diagram showing a cryogenic test device 10 according to an embodiment of the present invention, and Figure 2 is an internal front view of the test room 100 in the cryogenic test device 10 according to an embodiment of the present invention. Figure 3 is an internal side view of the test room 100 in the cryogenic test apparatus 10 according to an embodiment of the present invention.

Referring to FIGS. 1 to 3 , the cryogenic test device 10 may include a test room 100, a fixing unit 200, a refrigerator 300, and a press unit 400.

The test room 100 is a space for testing the specimen 20, and the specimen 20 is stored therein and may be formed in a sealed structure.

A first door portion 110 may be formed at one end of the test room 100 to facilitate replacing the specimen 20 stored inside the test room 100.

The fixing unit 200 is located inside the test room 100 and can fix the specimen 20.

One end of the fixing part 200 is coupled to the refrigerator 300, and the other end of the fixing part 200 is in contact with the specimen 20 to transfer heat from the freezer 300 to the specimen 20.

When the fixing part 200 comes into contact with the specimen 20, a portion of the specimen 20 may be exposed. Alternatively, the fixing part 200 may be configured to surround the entire specimen 20.

The fixing part 200 may include a first clip part 210 that fixes one side of the specimen 20 and a second clip part 220 that fixes the other side of the specimen 20.

For example, as shown in FIG. 2, the first clip portion 210 is coupled to the first refrigerator 301 formed on the left side of the test room 100, which will be described later, and one side of the specimen 20 is inserted. A space can be formed. At this time, one side of the specimen 20 may be inserted into and fixed in the space provided by the first clip part 210, and may be fixed by tightening a bolt formed on the front of the first clip part 210. It is not limited.

Meanwhile, as shown in FIG. 2, the second clip portion 220 is coupled to the second refrigerator 303 formed on the right side of the test room 100, which will be described later, and the other side of the specimen 20 can be inserted. Space can be formed. At this time, the other side of the specimen 20 may be inserted into and fixed in the space provided by the second clip part 220, and may be fixed by tightening the bolt formed on the front of the second clip part 220. It is not limited.

Here, a portion of the specimen 20 may be exposed between the first clip portion 210 and the second clip portion 220.

For example, as shown in FIG. 2, the central portion of the specimen 20 is exposed between the first clip portion 210 and the second clip portion 220 and may be pressed by the press portion 400.

The refrigerator 300 is coupled through the test room 100 and can cool the specimen 20 by contacting the fixing part 200. In the present application, the refrigerator 300 may be a refrigerator 300 that generates cooling capacity by the GM (Gifford-McMahon) cycle using helium gas as a working fluid, but is not limited thereto and includes, for example, a Sterling refrigerator, It may be composed of a pulse tube freezer, Joule Thompson freezer, etc.

Meanwhile, the refrigerator 300 is formed on the left side of the test room 100 and is in contact with the first clip portion 210, and the first refrigerator 301 is formed on the right side of the test room 100 and is in contact with the second clip portion 220. ) may include a second refrigerator 303 in contact with the.

The first freezer 301 is in contact with the first clip part 210 to freeze one side of the specimen 20, and the second freezer 303 is in contact with the second clip part 220 to freeze the other side of the specimen 20. can be frozen.

Accordingly, by simultaneously freezing both sides of the specimen 20, the time until the specimen 20 is frozen can be shortened.

The freezer 300 includes a first stage freezer 310 that is in contact with the test room 100 to cool the test room 100, and a second stage freezer 320 that is in contact with the fixture 200 to cool the specimen 20. ) may include.

For example, as shown in FIGS. 2 and 3, the first stage refrigerator 310 can maintain the internal temperature of the test room 100 at a low temperature by contacting and cooling the test room 100. The second stage freezer 320 can cool the specimen 20 to the temperature required for the test by contacting and cooling the fixing part 200.

In this way, the refrigerator 300 includes a first-stage refrigerator 310 that cools the test room 100 and a second-stage refrigerator 320 that contacts and cools the specimen 20, so that the specimen 20 to be tested The temperature around the specimen 20 can be efficiently cooled.

The press unit 400 is coupled through the test room 100 and can press the specimen 20 by reciprocating in the height direction toward the fixing unit 200.

As shown in FIG. 1, the press unit 400 is connected from the top of the cryogenic test device 10 and penetrates the test room 100, so that it can reciprocate in the height direction by the user's manipulation.

The press unit 400 may press the exposed portion of the specimen 20. For example, as shown in FIG. 2, the press unit 400 may press the central portion of the specimen 20 exposed between the first clip unit 210 and the second clip unit 220.

As shown in FIGS. 2 and 3 , the press unit 400 may include a first insulation member 410 in contact with the specimen 20 at the lowermost end. Here, the first insulation member 410 has a cylindrical shape, and as shown in FIG. 3, the top and bottom surfaces of the cylinder can be coupled to the press unit 400 so as to face the front and rear of the press unit 400. there is.

As shown in FIG. 2, the press unit 400 has a receiving space for accommodating a portion of the first insulating member 410, and a portion of the first insulating member 410 is accommodated in the accommodating space and the other portion is exposed. It can be coupled to the press unit 400 as much as possible. At this time, a portion of the side (side of the cylinder) of the first insulation member 410 faces the specimen 20.

The first insulation member 410 may be formed of a material such as epoxy resin, G10, G11, FR-4, etc., which is obtained by impregnating epoxy resin with glass fiber and then laminating and molding it at high heat and high pressure.

In this way, the press unit 400 further includes a first insulation member 410 at the portion in contact with the specimen 20, resulting in frictional heat generated when the press unit 400 presses the specimen 20. It is possible to prevent the temperature of the specimen 20 from changing.

When the part of the first insulation member 410 in contact with the specimen 20 is worn due to continuous use of the press unit 400 and accurate test measurement is not possible, the press unit 400 and the first insulation member 410 After releasing the fixed combination, the first insulation member 410 can be reassembled and used by rotating the central axis of the cylinder so that the unworn part faces the specimen 20.

According to the present application, even if the first insulation member 410 whose strength is lower than that of a conventional pressing member is used, the press unit 400 can be used semi-permanently by replacing the first insulation member 410.

In addition, the first insulation member 410 can be rotated and used whenever the part of the first insulation member 410 in contact with the specimen 20 is worn, so the replacement cycle of the first insulation member 410 can be extended. there is.

Meanwhile, the cryogenic test device 10 may further include a jig portion 500 that is located at the lower part of the test room 100 and protrudes to support the fixing portion 200 or the specimen 20.

That is, the jig part 500 supports the fixing part 200 or is positioned close to the fixing part 200 so as to support the specimen 20 when a part of the specimen 20 is exposed as shown in FIG. 2. It may be formed as a protrusion.

For example, as shown in FIG. 2, the jig part 500 supports one side of the first clip part 210 or the specimen 20 and the other side of the second clip part 220 or the specimen 20. It may be formed to protrude from the lower portions of the first clip part 210 and the second clip part 220, respectively.

The jig portion 500 may include a second insulation member 510 at a portion that is in contact with the fixing portion 200 or the specimen 20. Here, the second insulation member 510 has a cylindrical shape, and as shown in FIG. 3, the top and bottom surfaces of the cylinder can be coupled to the jig portion 500 so as to face the front and rear of the jig portion 500. there is.

As shown in FIG. 2, the jig portion 500 has a receiving space for accommodating a portion of the second insulating member 510, and a portion of the second insulating member 510 is accommodated in the accommodating space and the other portion is exposed. It can be coupled to the jig portion 500 as much as possible. At this time, a portion of the side (side of the cylinder) of the second insulation member 510 faces the specimen 20.

At this time, the second insulation member 510 may be made of a material such as epoxy resin, G10, G11, FR-4, etc., which is obtained by impregnating glass fiber with epoxy resin and then laminating and molding it at high heat and pressure.

In this way, the jig part 500 includes the second insulation member 510 at the part in contact with the specimen 20, so that the specimen 20 is in contact with the specimen 20 due to frictional heat generated when the specimen 20 is pressed by the press unit 400. (20) This can prevent the temperature from changing.

When the part of the second insulation member 510 in contact with the specimen 20 is worn due to continuous use of the jig portion 500 and accurate test measurement is not possible, the jig portion 500 and the second insulation member 510 After releasing the fixed combination, the second insulation member 510 can be reconnected and used by rotating the central axis of the cylinder so that the unworn part faces the specimen 20.

The jig portion 500 may further include a third insulation member 520 at a lower portion in contact with the test room 100.

As shown in FIGS. 2 and 3, a third insulation member 520 is further included in the lower part of the jig portion 500 to prevent heat exchange from occurring between the jig portion 500 and the test room 100. can do.

Meanwhile, the cryogenic test device 10 may further include a cover portion 600 that surrounds the test room 100 and has a vacuum-treated gap between the test room 100 and the test room 100 .

The outside of the cover part 600 may further include a vacuum port (not shown) for vacuuming the gap between the test room 100 and the cover part 600.

The gap between the test room 100 and the cover part 600 is vacuumed through a vacuum port (not shown), thereby maximizing the insulation effect between the outside of the test room 100 and the inside of the cover part 600. This can minimize heat exchange.

The cover unit 600 may further include a heater unit (not shown).

For example, as a heater unit (not shown) connected to the power supply unit of the cryogenic test device 10 is disposed on the inner peripheral surface of the cover unit 600, power is turned on to the heater unit (not shown) after the test at cryogenic temperature is completed. The time it takes to restore the cryogenic test device 10 in a cryogenic state to room temperature can be shortened. Additionally, testing in a high temperature environment may be possible through a heater unit (not shown).

The heater unit (not shown) may be arranged in a zigzag shape on the inner peripheral surface of the cover unit 600 in the form of a heating wire, but is not limited to this.

The cover part 600 may have a second door part (not shown) formed in a position corresponding to the above-described first door part 110.

As a second door part (not shown) is formed at one end of the cover part 600 at a position corresponding to the first door part 110, when the specimen 20 stored inside the test room 100 is replaced It can be easy.

As described above, according to the cryogenic test device 10 according to an embodiment of the present invention, the specimen 20 can be cooled directly through the refrigerator 300 to the cryogenic temperature desired by the user.

In addition, the press unit 400 further includes a first insulation member 410 at a portion in contact with the specimen 20, so that the specimen 20 is in contact with the specimen 20 due to frictional heat generated by contact with the press unit 400. It is possible to prevent the temperature of the sample from changing, and the jig portion 500 further includes a second insulation member 510 at the portion in contact with the specimen 20, so that the specimen 20 and the jig portion 500 are in contact with each other. It is possible to prevent the temperature of the specimen 20 from changing due to frictional heat generated.

The description of the present invention described above is for illustrative purposes, and those of ordinary skill in the technical field to which the present invention pertains can understand that it can be easily modified into other specific forms without changing the technical idea or essential features of the present invention. There will be. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive. For example, each component described as single may be implemented in a distributed manner, and similarly, components described as distributed may also be implemented in a combined form.

In addition, the scope of the present invention is indicated by the claims described below rather than the detailed description above, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. do.

10: Cryogenic test device
20: Psalm
100: Test room
110: first door part
200: fixing part
210: first clip part
220: second clip part
300: Freezer
301: 1st freezer
303: Second freezer
310: 1st stage freezer
320: Second stage freezer
400: Press section
410: first insulation member
500: Jig part
510: Second insulation member
520: Third insulation member
600: Cover part

Claims (13)

In a cryogenic test device using a refrigerator,
a test room for testing specimens;
A fixture located inside the test room and fixing the specimen;
A refrigerator that penetrates the test room and cools the specimen by contacting the fixture;
A press unit coupled through the test room and reciprocating in the height direction toward the fixing unit to press the specimen,
The refrigerator,
a first stage refrigerator in contact with the test room and cooling the test room; and
It includes a second stage freezer that cools the specimen by contacting the fixture,
The press unit includes a first insulation member in a portion in contact with the specimen.
According to claim 1,
The fixing part,
a first clip portion that secures one side of the specimen; and
A cryogenic test device comprising a second clip portion for fixing the other side of the specimen.
According to claim 2,
The refrigerator,
a first refrigerator in contact with the first clip portion; and
A cryogenic test device comprising a second refrigerator in contact with the second clip portion.
According to claim 2,
A portion of the specimen is exposed between the first clip portion and the second clip portion.
delete According to claim 1,
The press unit presses the exposed portion of the specimen.
delete According to claim 1,
The cryogenic test device is located at the lower part of the test room and further includes a jig part protruding to support the fixing part or the specimen.
According to claim 8,
A cryogenic testing device wherein the jig portion includes a second insulation member at a portion in contact with the specimen.
According to claim 8,
The jig portion further includes a third insulation member at a lower portion in contact with the test room.
According to claim 1,
A cryogenic test device further comprising a cover portion surrounding the test room and having a vacuum-treated gap between the test room and the test room.
According to claim 11,
The cryogenic test device further includes a heater portion connected to the power supply of the cryogenic test device on the inner peripheral surface of the cover portion.
According to claim 11,
A cryogenic test device in which a first door part is formed at one end of the test room, and a second door part is formed on the cover part at a position corresponding to the first door part.