JP3719619B2 - Cartridge with specimen quenching mechanism - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sample cartridge for rapidly cooling and solidifying a sample heated and melted in a sample cartridge mounted on a heating device such as an electric furnace in space material experiments, and more particularly to a cartridge with a rapid cooling mechanism. It is.
[0002]
[Prior art]
As a means for cooling the sample heated to a high temperature, an inert gas such as helium is enclosed in the electric furnace at the same time as the heating is completed, and heat transfer by the gas is used, or a water-cooled pipe provided on the outer wall of the electric furnace or There is a means to exhaust heat with a water cooling jacket. However, in this case, since the cooling gas is sealed in the high-temperature electric furnace immediately after the heating, the electric furnace itself has a much larger heat capacity than the cartridge, so the cooling rate of the sample is about 1 ° C./second at most. The required cooling rate was not obtained. Therefore, a “cartridge with a quenching mechanism” in which cooling gas is blown into the heated cartridge is proposed by the same applicant as that of the present invention (Japanese Patent Laid-Open No. 8-68593).
[0003]
FIG. 3 is a view showing a cartridge with a quenching mechanism proposed in Japanese Patent Laid-Open No. 8-68593. The cartridge with a quenching mechanism shown in this figure has a hollow cylindrical sample cartridge 2 having a sample storage chamber 1 therein, a cooling gas inlet port 3 and a cooling gas outlet port 4, and is attached to one end of the sample cartridge 2. A cooling gas forward passage that includes a header 5 that is formed and a sealing cap 6 that is attached to the other end of the sample cartridge 2, and communicates with the cooling gas inlet port 3 of the header 5. 7 and a cooling gas return passage 8 communicating with the cooling gas outlet port 4 of the header 5. With this configuration, the sample in the sample cartridge 2 is heated together with the sample cartridge 2 in a heating furnace, and simultaneously with the completion of the heating, the cooling gas flows from the cooling gas inlet port 3 of the header 5 to the cooling gas forward passage 4 of the sample cartridge 2. Further, it can be discharged from the cooling gas outlet port 4 through the cooling gas return passage 8. That is, the cooling gas can be cooled by flowing into the main body of the sample cartridge 2 without enclosing the cooling gas in the heating furnace, and the sample can be rapidly cooled.
[0004]
[Problems to be solved by the invention]
However, although the above-described cartridge with the quenching mechanism can quench the sample cartridge itself, there is a large difference in the cooling rate in the sample axial direction, which causes a problem that a large temperature difference occurs in the axial direction during rapid cooling. That is, in the above-mentioned cartridge with the rapid cooling mechanism, cooling gas is supplied to the gap surrounding the sample cartridge to quench it, but since this gap is constant in the sample axis direction, the upstream cooling becomes stronger and the temperature uniformity deteriorates. There was a problem to do.
[0005]
The present invention has been made to solve such problems. That is, the object of the present invention is to rapidly cool a hollow cylindrical sample cartridge and to make the cooling rate in the axial direction of the sample cartridge more uniform, thereby making the axial temperature distribution during quenching more uniform. Another object of the present invention is to provide a cartridge with a sample quenching mechanism in a soaking furnace.
[0006]
[Means for Solving the Problems]
According to the present invention, a hollow cylindrical sample container in which a sample is enclosed, and a hollow cylindrical sample cartridge that surrounds the sample container at an interval so that cooling gas flows through the gap between the sample container and the sample container. The sample cartridge is inserted into a soaking furnace that uniformly heats the sample in the sample container, and the sample container is held concentrically with the sample cartridge. A cartridge with a sample quenching mechanism is provided in which the inner surface of the cartridge is configured such that the gap with the sample container gradually decreases from the upstream side to the downstream side.
[0007]
According to a preferred embodiment of the present invention, the gap between the sample cartridge and the sample container is determined such that the heat transfer coefficient α determined from the temperature and flow velocity of the cooling gas flowing through the gap increases toward the downstream. The sample cartridge includes a hollow tube and a sleeve tube fixed in the hollow tube, and the sleeve tube is formed as a tapered tube having a narrow downstream side.
[0008]
According to the configuration of the present invention, the inner surface of the sample cartridge is configured such that the gap with the sample container gradually decreases from the upstream side to the downstream side, so that the flow rate increases toward the downstream side, for example, the heat transfer coefficient α Is determined so as to increase in the downstream direction, the velocity of the cooling gas flowing along the rod-shaped sample axis can be forcibly distributed in the axial direction, and the cooling performance on the sample surface can be made closer to the axial direction uniformly. it can. Therefore, when cooling the rod-shaped sample, it is possible to ensure better temperature uniformity together with rapid cooling.
[0009]
Further, the sample cartridge comprises a hollow tube and a sleeve tube fixed in the hollow tube, and the sleeve tube is formed into a tapered tube with a narrow downstream side, thereby improving the cooling performance of the sample downstream portion, The sample temperature can be made more uniform.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected and used for the common part in each figure.
FIG. 1 is a configuration diagram of a cartridge with a sample quenching mechanism according to the present invention. In this figure, a cartridge with a sample quenching mechanism 10 of the present invention includes a hollow cylindrical sample container 12 enclosing a sample therein, and a hollow cylindrical sample cartridge 14 surrounding the sample container 12 with a gap C therebetween. Become.
[0011]
In the sample cartridge 14, the cooling gas 9 flows through a gap C between the sample cartridge 12 and the sample cartridge 12. The sample cartridge 14 is inserted into a soaking furnace (not shown) that uniformly heats the sample in the sample container 12.
[0012]
In FIG. 1, the sample container 12 is held by a support member 13 concentrically with the sample cartridge 14. The support member 13 is provided with a plurality of through portions in the circumferential direction, and the cooling gas 9 can freely pass through the through portions. In this example, the sample cartridge 14 includes a hollow tube 14a and a sleeve tube 14b attached in the hollow tube 14a. The sleeve tube 14b is formed as a tapered tube having a narrow downstream side. Is configured such that the gap C with the sample container 12 gradually decreases from the upstream side to the downstream side.
[0013]
2A and 2B are schematic diagrams showing the temperature distribution and flow velocity distribution in the cartridge. FIG. 2A shows the temperature distribution and FIG. 2B shows the flow velocity distribution. As shown in FIG. 2A, as the sample container 12 flows from the upstream side to the downstream side, the temperature of the cooling gas 9 rises as the sample container 12 is cooled. The degree of this temperature increase can be adjusted to some extent by the flow rate of the cooling gas 9 and the initial temperature. On the other hand, as shown in FIG. 2B, the flow rate of the cooling gas 9 also increases as it flows from the upstream side to the downstream side of the sample container 12. As described above, since the gap C with the sample container 12 is configured to gradually decrease from the upstream side to the downstream side, the degree of this speed increase increases rapidly as compared with the conventional case.
[0014]
According to the present invention, the gap C between the sample cartridge 14 (that is, the sleeve tube 14b) and the heat transfer coefficient α determined from the temperature t and the flow velocity v of the cooling gas flowing through the gap C increases toward the downstream. It is determined to be. This configuration can be implemented by adjusting the temperature t of the cooling gas 9 according to the flow rate of the cooling gas 9 and the initial temperature, and adjusting the flow velocity v by changing the inner shape of the sample cartridge 14.
[0015]
In addition, this invention is not limited to embodiment mentioned above, Of course, it can change variously in the range which does not deviate from the summary of this invention.
[0016]
【The invention's effect】
With the above-described configuration, the inner surface of the sample cartridge 14 is configured such that the gap C with the sample container 12 gradually decreases from the upstream side to the downstream side, so that the flow velocity increases toward the downstream side. By setting it to become larger toward the downstream, the velocity of the cooling gas 9 flowing along the rod-shaped sample axis can be forcibly distributed in the axial direction, and the cooling performance on the sample surface can be made closer to the axial direction uniformly. In addition, when the rod-shaped sample is cooled, better temperature uniformity can be secured together with rapid cooling.
[0017]
Therefore, the cartridge with the sample quenching mechanism of the present invention can quench the hollow cylindrical sample cartridge and can make the cooling rate in the axial direction of the sample cartridge more uniform, and thereby the axial temperature distribution during quenching Can be made more uniform.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a cartridge with a sample quenching mechanism according to the present invention.
FIG. 2 is a diagram showing a temperature distribution and a flow velocity distribution in the cartridge.
FIG. 3 is a configuration diagram of a conventional cartridge with a rapid cooling mechanism.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sample storage chamber 2 Sample cartridge 3 Cooling gas inlet port 4 Cooling gas outlet port 5 Header 6 Sealing cap 7 Cooling gas forward passage 8 Cooling gas return passage 9 Cooling gas 10 Sample rapid cooling mechanism cartridge 12 Sample container 13 Support member 14 Sample Cartridge 14a Hollow tube 14b Sleeve tube

Claims (3)

A hollow cylindrical sample container in which a sample is enclosed, and a hollow cylindrical sample cartridge that surrounds the sample container at an interval and allows a cooling gas to flow between the sample container and the sample container.
The sample cartridge is inserted into a soaking furnace that uniformly heats the sample in the sample container, the sample container is held concentrically with the sample cartridge, and the inner surface of the sample cartridge is the sample container The sample quenching mechanism-equipped cartridge is characterized in that the gap between the first and second samples is gradually reduced from the upstream side to the downstream side. 2. The sample cartridge according to claim 1, wherein a gap between the sample cartridge and the sample container is determined such that a heat transfer coefficient α determined from a temperature and a flow velocity of the cooling gas flowing through the gap increases toward a downstream side. Cartridge with sample quenching mechanism. The sample rapid cooling according to claim 1, wherein the sample cartridge includes a hollow tube and a sleeve tube fixed in the hollow tube, and the sleeve tube is formed as a tapered tube having a narrow downstream side. Cartridge with mechanism.

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