JP2957255B2 - Variable temperature test tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a variable temperature test tank, and more particularly to a material test of a sample activated in a nuclear reactor or the like under a special atmosphere from a low temperature to a high temperature. To a variable temperature test chamber.

[Conventional technology]

Generally, for materials used in equipment that is affected by radioactivity in nuclear facilities, etc., changes in the materials due to irradiation must be understood. For this reason, a test piece of the same material as the used material is irradiated with a nuclear reactor or the like, and various material tests are performed on the irradiated material.

Further, by inspecting the test piece after the material test with a transmission electron microscope, it is possible to grasp the change in the material composition in more detail. For this reason, an ultra-small material testing machine has been developed which can use a test piece molded to a small size so that a test piece for a material test can be used as it is as a sample for a transmission electron microscope.

For example, a small punch (SP) testing machine is a punching testing machine that can use a small thin TEM sample having a diameter of 3 mm as a test piece.

Therefore, the TEM sample is tested in a hot laboratory using an SP tester or the like in order to understand the effects of irradiation by neutrons or the like.

This sample needs to be performed in a wide temperature environment because the strength characteristics of the material depend on the environmental temperature. For example, brittle fracture tests of steel materials etc. are carried out in the range of about -150 to 200 ° C, and tests to determine the high-temperature strength characteristics of furnace materials are carried out in a temperature environment from room temperature to about 900 ° C. I have. For this reason, conventionally, two temperature equipments capable of setting respective temperatures were prepared, and a method of replacing a chamber according to a test purpose was adopted.

[Problems to be solved by the invention]

However, when the test sample described above is a nuclear reactor material or the like, each test must be performed in a hot cell to protect radioactivity. This hot cell has radioactive protection measures to prevent leakage of γ-rays to the outside of the cell and scattering of contaminated powder, and is a considerably expensive facility. For this reason, a test machine installed in the hot cell is required to have multiple functions.

However, the conventional temperature control method requires a tester to directly replace the chamber according to the purpose of the test, and also has a problem that the work load of the tester is increased in terms of protection of radioactivity.

Further, the following problems are also caused by the structure of the conventional testing machine.

In other words, a method of directly injecting low-temperature nitrogen gas onto the sample is used to achieve a very low-temperature environment, but when the sample or test machine is cooled in the atmosphere, moisture in the air freezes and errors occur in the test data. It is liable to occur, and there is a problem that corrosion or the like occurs in the test apparatus and the deterioration of the apparatus is accelerated.

On the other hand, when the sample is heated in the air by a heater or the like, there is a problem that the sample is rapidly oxidized and deteriorated, and an accurate test result cannot be obtained.

Therefore, an object of the present invention is to solve the above-mentioned problems of the conventional technology, and to directly cool by heat conduction while measuring the temperature of a tester and a sample that are insulated from the outside under vacuum, An object of the present invention is to provide a variable temperature test tank that can be heated by an adjustable heater.

[Means for solving the problem]

In order to achieve the above object, the present invention has a cylindrical rod guide section in which a lifting rod for pressing a punch is fitted inside, and a part in the longitudinal direction is connected by an insulated coupler, and a lower part of the rod guide section. A cooling jacket that fits a cylinder around the outer periphery of the formed annular flange, connects a liquid nitrogen introduction pipe and a vaporized nitrogen discharge pipe to the cylinder, and cools the lower end of the rod guide portion with liquid nitrogen stored therein, Equipped with a temperature detector,
A punching test part in which the test piece sandwiched between the die and the wrinkle retainer is squeezed downward by the punch, and the punching test part is supported so that the upper surface of the wrinkle retainer contacts the lower surface of the cooling jacket. And, a tubular fixed base partly connected in a longitudinal direction by an adiabatic coupler, an annular heater arranged to surround the punching test section, the cooling jacket, the punching test section and the heater A vacuum container for accommodating the rod guide portion and the fixing base so that the heat insulating coupler of the rod guide portion and the heat insulating coupler of the fixing base are located inside the container. It is.

(Operation)

According to the present invention, a cylindrical rod guide portion in which a vertically extending rod for pressing a punch is fitted inside, and a part in the longitudinal direction is connected by an adiabatic coupler, is inserted into the vacuum vessel, and the rod guide is inserted. A cylinder is fitted on the outer periphery of the annular flange formed at the lower part of the part to form a cooling jacket, and a liquid nitrogen introduction pipe and a vaporized nitrogen discharge pipe are connected to this cylinder to introduce liquid nitrogen into the rod. Cool the lower end of the guide,
In addition to providing a punching test section that squeezes the test piece sandwiched between the die and the wrinkle retainer downward with the punch,
The punching test section is provided with a temperature detecting section, and the punching test is performed so that the upper surface of the wrinkle retainer and the lower surface of the cooling jacket come into contact with each other with a tubular fixing base having a part in the longitudinal direction connected by an adiabatic coupler. Part, the punch-out test section is surrounded by an annular heater, the cooling jacket, the punch-out test section, and the heater are accommodated, and the fixing stand such that the heat-insulating coupler of the fixing stand is located inside the container. Is inserted into the vacuum vessel, so that the temperature can be set directly by heat conduction while measuring the temperature of the test machine and the test piece that are insulated from the outside under vacuum, and the temperature can be adjusted by the heater. The material can be heated while preventing oxidation of the material.

〔Example〕

Hereinafter, an embodiment of a variable temperature test tank according to the present invention will be described with reference to the drawings.

In the drawings, reference numeral 1 denotes a vacuum chamber, which is supported by a fixed part (not shown) and can be vacuumed to a predetermined degree of vacuum by a connected vacuum pump. Openings 2 and 3 are provided at opposing positions on the upper and lower surfaces.
And a rod guide tube 4 suspended from an upper support (not shown) is inserted into the upper surface opening 2. The rod guide tube 4 is a thick stainless steel tube, and is slidably fitted to the flange plate 5 so as to be located substantially at the center of the opening. In addition, the opening 2
On the lower side, a heat insulating coupler 6 made of ceramics or the like is screwed to the rod guide tube 4 for connection with the lower end.

Further, a lifting rod 7 is inserted into the rod guide tube 4. The lifting rod 7 is supported in such a manner that the pressure applied by an upper pressing device (not shown) can be measured by a gauge or the like.

On the other hand, a cooling jacket 8 is formed at the lower end of the rod guide tube 4 connected by the heat insulating coupler 6. The cooling jacket 8 is provided on two annular flanges 9, 9 protruding from the lower end of the rod guide tube 4.
10 is externally fitted, and an annular container part whose end is welded and joined is a small-diameter liquid nitrogen introduction pipe 11 on the upper side of the cylinder 10 and a vaporizer for discharging vaporized and filled vaporized nitrogen inside the jacket to the outside. A nitrogen discharge pipe 12 is connected. The liquid nitrogen introduction pipe 11 and the vaporized nitrogen discharge pipe 12 are made of a material having high thermal conductivity such as a copper pipe or a stainless steel pipe.
Reference numeral 11 allows a predetermined amount of liquid nitrogen to be introduced from a liquid nitrogen supply source (not shown). On the other hand, the nitrogen gas discharge pipe 12
Is connected to a drain port 13 on the side of the vacuum chamber 1.

The lower surface 8a of the cooling jacket 8 is in contact with the upper surface 14a of the punching test section 14. The punching test section 14 is composed of a die 15, a wrinkle holder 16 and a punch 17, and the die 15 is supported on the top of a vertically movable fixed base 18 extending upward from the lower surface opening 3. The test piece 19 such as a TEM sample can be accommodated in the recess 15a at the center of the upper surface. The test piece 19 in the recess 15a is sandwiched between the wrinkle presser 16 and the test piece 19. A guide hole 20 is formed at a substantially central position of the wrinkle retainer 16. The guide hole 20 is for guiding the small-diameter punch 17 to the surface of the test piece 19, and the punch 17 is pressed downward by the lifting rod 7 along the guide hole 20 with a predetermined pressing force. The piece 19 is squeezed downward. At this time, circular holes 21 and 22 are formed in the die 15 and the fixing base 18, respectively, so that a displacement meter or the like in which a small-diameter probe or the like is mounted can be inserted therein. .

A temperature detecting piece 23 is fixed to the lower side surface of the cooling jacket 8 by a screw 24. This temperature detecting piece 23
Has a substantially L-shape, and its lower end is in contact with the upper surface of the die 15. The temperature detecting piece 23 can measure the temperature of the dice outside the chamber 1 connected to a thermocouple (not shown). Thereby, the temperature of the test piece 19 accommodated in the die 15 can be sequentially grasped.

In addition, in order to clarify the structure of the die 15, in this embodiment, a die accommodating a square test piece of 10 × 10 mm is shown in place of the test piece for the TEM sample. By exchanging the attachments, various kinds of micro test pieces can be tested.

The lower part of the cooling jacket 8 and the punching test part 14
A coil-shaped heater 25 is arranged so as to surround the above. Although this heater 25 is a resistance heater, it is heated in a vacuum state, so that oxidation of the test piece 19 and the like can be prevented.

 Next, the temperature setting of the test piece will be described.

When the test is performed at a low temperature, direct cooling by the cooling jacket 8 is performed. That is, since the cooling jacket 8 stores liquid nitrogen therein as described above, it can be cooled to approximately -195 ° C. Further, a wrinkle retainer 16 is in contact with the lower surface of the cooling jacket 8, and the low-temperature layer from the cooling jacket 8 is successively heated by heat conduction.
9, spread to 15 dice.

The cooling temperature can be set to an intermediate temperature by adjusting the amount of liquid nitrogen flowing into the cooling jacket 8 with an ON-OFF valve outside the vacuum chamber.

On the other hand, when the test is performed in a high temperature state, the entire punching test section 14 may be heated by the heater 25. At this time, the heater 25 can finely adjust the set temperature based on the temperature data obtained from the temperature detector.

In addition, heat conduction from the outside to the push-out test section 14 can be cut off by the heat-insulating couplers 6 connected to the rod guide section 4 and the fixed base 18.

〔The invention's effect〕

As is apparent from the above description, according to the present invention, a tubular rod guide part in which a lifting rod is fitted inside is connected by an insulated coupler into a vacuum vessel, and the lower part of the rod guide part is inserted. A cooling jacket is formed to cool the lower end of the rod guide section, and a punching test section is provided so that the test piece is squeezed downward by the punch. A temperature detecting section is provided in the punching test section, and a part is insulated. A cylindrical fixing base connected by a coupler supports a punching test section surrounded by a heater so that the upper surface of the wrinkle retainer and the lower surface of the cooling jacket are in contact with each other, and the above-described components are housed in a vacuum vessel. Therefore, there is an effect that a material test can be performed in a wide atmosphere from a low temperature state to a high temperature state under vacuum.

[Brief description of the drawings]

The drawing is a cross-sectional view showing one embodiment of the variable temperature test tank according to the present invention. 1 ... Vacuum chamber, 4 ... Rod guide tube, 6 ... Insulated coupler, 7 ... Elevating rod, 8 ... Cooling jacket, 9 ... Circular flange, 11 ... Liquid nitrogen introduction tube, 12 ...
… Vacuum nitrogen discharge pipe, 14… Punching test part, 15… Die, 16… Wrinkle holder, 17 …… Punch, 18 …… Fixed base, 19
… Test piece, 23… Temperature detection piece, 25… heater.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Haruo Nagayama 2-6-10 Iwamotocho, Chiyoda-ku, Tokyo Inside Tekko Testack Co., Ltd. (72) Inventor Ryohachi 2-6 Iwamotocho, Chiyoda-ku, Tokyo No. 10 Tohoku TeStack Co., Ltd. (56) References JP2, 103251 (JP, U) (58) Field surveyed (Int.Cl. ⁶ , DB name) G01N 3/00-3/62

Claims (1)

(57) [Claims] An up-and-down rod for pressing a punch is fitted inside, and a cylindrical rod guide portion having a part in the longitudinal direction connected by an insulated coupler, and an annular flange formed at a lower portion of the rod guide portion. A cooling jacket that cools the lower end of the rod guide with liquid nitrogen stored inside by connecting a liquid nitrogen introduction pipe and a vaporized nitrogen discharge pipe to the cylinder, and a temperature detection unit, A punching test part in which the test piece sandwiched between the die and the wrinkle retainer is squeezed downward by the punch, and the punching test part is supported so that the upper surface of the wrinkle retainer contacts the lower surface of the cooling jacket. And, a tubular fixed base partly connected in a longitudinal direction by an adiabatic coupler, an annular heater arranged to surround the punching test section, the cooling jacket, the punching test section and the heater Contain In addition, there is provided a vacuum container in which the rod guide and the fixing base are inserted so that the heat insulating coupler of the rod guide and the heat insulating coupler of the fixing base are located inside the container. Test tank.