JP6107673B2 - Heat-resistant container - Google Patents

Description

  The present invention relates to a heat-resistant container for housing a measuring tool for processing measurement data of a workpiece to be heat-treated.

  2. Description of the Related Art Conventionally, a temperature measuring device that measures the temperature of a workpiece heated in a furnace when performing a heat treatment on the workpiece using a heating furnace, such as carburizing treatment or nitriding treatment on a steel material, is well known. Moreover, in the temperature measuring device exposed to such a high temperature environment, the structure which accommodates the temperature measuring tool (data logger) which processes the temperature measurement data of a workpiece | work in a heat-resistant container and is protected from a high temperature environment is known (for example, The heat-resistant container described in Patent Document 1).

The heat-resistant container disclosed in Patent Document 1 is filled between an inner container that houses a temperature measuring tool that processes temperature measurement data, an outer container that houses the inner container, and the inner container and the outer container, The inner container and the outer container are configured as a sealed container that does not allow moisture to pass therethrough.
The heat-resistant container configured in this way is carried into the heating furnace together with the workpiece, and protects the temperature measuring tool for measuring the temperature during the heat treatment of the workpiece from the high temperature environment in the heating furnace. That is, when the heat-resistant container is exposed to a high temperature environment in the heating furnace, moisture contained in the porous material evaporates, and the temperature of the porous material is maintained at about 100 ° C. by the latent heat of water evaporation. The temperature measuring instrument accommodated in the inner container is prevented from rising to the breaking temperature.

  However, in the heat-resistant container disclosed in Patent Document 1, if the container is continuously exposed to a high temperature environment for a long time, moisture contained in the porous material continues to vaporize, and the internal pressure of the outer container increases. Furthermore, when the internal pressure of the external container rises, the temperature in the external container rises, making it difficult to accurately measure the temperature with the temperature measuring tool, and the heat-resistant container may be damaged.

  In order to suppress such an increase in the internal pressure of the external container, it is conceivable to form a pressure release hole in the external container that communicates the inside and the outside of the external container. In other words, by forming a pressure release hole in the external container, the vapor generated by the evaporation of moisture contained in the porous material is discharged from the pressure release hole to the outside of the external container, and the internal pressure of the external container increases. Can be prevented.

Here, when the work to be heat-treated is carried into the heating furnace, in order to prevent disturbance of the atmosphere in the heating furnace due to the work being carried in and to perform high-precision heat treatment, A purge chamber is arranged on the side, and a purge process is performed on the workpiece before being carried into the heating furnace in the purge chamber. Specifically, in the purge chamber in which the workpiece is arranged, after the vacuum is once made, the same gas as the processing gas supplied into the heating furnace is filled.
When the heat-resistant container is disposed together with the workpiece in the purge chamber in which vacuuming is performed in this way, the moisture contained in the porous material in the heat-resistant container evaporates as the pressure in the purge chamber is reduced. It is discharged from the punched hole to the outside of the heat-resistant container. As a result, the time for reducing the pressure in the purge chamber to the required pressure is lengthened, and the moisture contained in the porous material is reduced, so that the heat resistance of the heat-resistant container is lowered.

JP 2011-43376 A

  Therefore, in the present invention, in a low temperature environment such as in the purge chamber before being heated in the heating furnace, the internal moisture is not released to the outside, and in a high temperature environment such as in the heating furnace, It is an object of the present invention to provide a heat-resistant container capable of preventing the internal pressure from rising by releasing the internal steam to the outside.

  The heat-resistant container that solves the above problems has the following characteristics.

  That is, in claim 1, the inner container for storing the measurement tool for processing the measurement data, the outer container for storing the inner container, and the inner container and the outer container are filled with moisture. The outer container has a communication hole that communicates the inside and the outside of the outer container, and the communication hole has a coefficient of thermal expansion higher than that of the outer container. It is blocked by a plug member made of a low material.

  That is, in claim 2, a seal member is interposed between the communication hole and the plug member.

  According to the heat-resistant container of the present invention, in a low temperature environment such as in the purge chamber before being heated in the heating furnace, the internal moisture is not released to the outside, and in a high temperature environment such as in the heating furnace. It is possible to prevent the internal pressure from being increased by discharging the internal steam to the outside.

It is a schematic diagram which shows the temperature processing apparatus provided with the heat processing apparatus and heat-resistant container which heat-process a workpiece | work. It is side surface sectional drawing which shows the temperature measuring device provided with the heat-resistant container. It is side surface sectional drawing which shows the obstruction | occlusion state by the plug member of the pressure release hole in a low temperature environment and a high temperature environment.

  Next, modes for carrying out the present invention will be described with reference to the accompanying drawings.

A heat-resistant container 10 shown in FIGS. 1 and 2 is an embodiment of a heat-resistant container according to the present invention. The heat-resistant container 10 is a container used for the temperature measurement device 1 that measures the temperature of the workpiece W that is heat-treated by the heat treatment device 5.
In the heat treatment apparatus 5, for example, carburizing treatment or nitriding treatment is performed as the heat treatment for the workpiece W.

The heat treatment apparatus 5 includes a heating furnace 52 that performs a heat treatment on the workpiece W, and a purge chamber 51 that is disposed on the upstream side of the heating furnace 52.
A heating furnace opening / closing door 54 is provided between the purge chamber 51 and the heating furnace 52 so as to be openable and closable. .
A heater 55 for heating the inside of the furnace is provided in the heating furnace 52.

  When the workpiece W is heat-treated by the heat treatment device 5, the workpiece W and the temperature measuring device 1 connected to the workpiece W are carried into the purge chamber 51 from the outside to perform a purge process, and then the workpiece W and the temperature measuring device 1 is carried into the heating furnace 52 from the purge chamber 51 and heat treatment is performed.

Specifically, first, the purge chamber opening / closing door 53 is opened, the workpiece W and the temperature measuring device 1 are loaded into the purge chamber 51, and then the purge chamber opening / closing door 53 is closed.
In the purge chamber 51 into which the workpiece W and the temperature measuring device 1 are carried, the air in the purge chamber 51 is discharged to the outside by evacuation, and the chamber is decompressed and used in the heat treatment in the heating furnace 52. A purge process for filling the purge chamber 51 with the process gas is performed.

Next, the heating furnace opening / closing door 54 is opened, the work W and the temperature measuring device 1 are carried into the heating furnace 52 from the purge chamber 51, and then the heating furnace opening / closing door 54 is closed.
In the heating furnace 52 into which the workpiece W and the temperature measuring device 1 are carried, the inside of the furnace is heated by the heater 55 and a processing gas is supplied to perform a heating process on the workpiece W.
The temperature measuring device 1 measures the temperature of the workpiece W to be heat-treated in the heating furnace 52 and processes and stores the measured temperature data.

As described above, the temperature measuring device 1 that measures the temperature of the workpiece W that is heat-treated in the heating furnace 52 includes the heat-resistant container 10, the temperature measuring tool 20, and the thermocouple 30.
A contact terminal 40 is formed at the tip of the thermocouple 30, and the contact terminal 40 is connected to the workpiece W. The base end portion of the thermocouple 30 is connected to the temperature measuring tool 20.
The temperature measurement tool 20 is configured by a history data recording device called a so-called data logger, and processes and stores the temperature of the workpiece W detected by the thermocouple 30 as measurement data.

  The heat-resistant container 10 includes an inner container 11 that houses the temperature measuring tool 20, an outer container 12 that houses the inner container 11, and a heat insulating material 13 that is filled between the inner container 11 and the outer container 12. . The heat insulating material 13 contains moisture.

The inner container 11 is formed in, for example, a hollow substantially cylindrical shape, and the temperature measuring tool 20 is accommodated in the inner space thereof.
The outer container 12 is formed in, for example, a hollow substantially cylindrical shape, and the inner container 11 is accommodated in the inner space thereof.

  The outer container 12 includes a first container 12a and a second container 12b that are formed in a bottomed cylindrical shape with one surface open, and the peripheral edges of the opening surfaces of the first container 12a and the second container 12b. The part is formed with a flange part protruding outward. The first container 12a and the second container 12b are integrally connected by abutting the respective opening surfaces and fastening the flange portions with fastening members such as bolts.

  The inner space of the outer container 12 is formed larger than the inner container 11, and the space between the inner container 11 and the outer container 12 is filled with a heat insulating material 13. As the heat insulating material 13, for example, gypsum can be used.

The thermocouple 30 connected to the temperature measuring device 20 passes through the wall surface of the inner container 11 and from the inner container 11 to the outer container 12 (inside the heat insulating material 13 between the outer container 12 and the inner container 11). It is extended. The thermocouple 30 further penetrates the wall surface of the outer container 12 and extends from the outer container 12 to the outside of the outer container 12.
The portions of the inner container 11 and the outer container 12 through which the thermocouple 30 penetrates are sealed with a sealing material 16 such as a compression fitting.
The thermocouple 30 is configured by, for example, a sheath thermocouple.

The outer container 12 is formed with a pressure release hole 12c that is a communication hole that communicates the inside and the outside of the outer container 12. The pressure release hole 12c makes it possible to release the increased pressure to the outside when the internal pressure of the outer container 12 increases.
The pressure release hole 12 c is closed by the plug member 15.

The plug member 15 is made of a material having a lower coefficient of thermal expansion than the material constituting the outer container 12. For example, the outer container 12 can be made of SUS, and the plug member 15 can be made of titanium.
Moreover, the plug member 15 can be comprised with a volt | bolt and a nut. In this case, the pressure relief hole 12c can be closed by the plug member 15 by fastening the nut to the bolt with the bolt inserted into the pressure relief hole 12c.

As shown in FIG. 3, in a low temperature (for example, normal temperature) environment, the plug member 15 closes the pressure release hole 12c without a gap, and the pressure release hole 12c is in an airtight / liquid tight state.
On the other hand, the plug member 15 is formed of a material having a lower coefficient of thermal expansion than the outer container 12 in a high temperature environment (for example, a temperature when the workpiece W is heat-treated in the heating furnace 52). The expansion degree of the container 12 is larger than the expansion degree of the plug member 15, and the inner diameter of the pressure release hole 12 c is larger than the outer diameter of the plug member 15. Thus, a gap 12d is formed between the pressure release hole 12c and the plug member 15, and the inside and outside of the outer container 12 can communicate with each other through the gap 12d.

  In the heat-resistant container 10 configured as described above, when the workpiece W is exposed to a high temperature environment such as a temperature when the workpiece W is heat-treated in the heating furnace 52, the moisture contained in the heat insulating material 13 evaporates. The temperature of the heat insulating material 13 is maintained at about 100 ° C. by the latent heat of vaporization of water. Thereby, it is prevented that the temperature measuring instrument 20 accommodated in the inner container 11 is heated to a temperature at which it breaks.

Further, when the heat-resistant container 10 is exposed to a high temperature environment, the moisture contained in the heat insulating material 13 evaporates and fills the inside of the outer container 12, but as described above, the pressure release hole 12c and the plug member 15 are filled. A gap 12d is formed between the outer container 12 and the water vapor in the outer container 12 is released to the outside of the outer container 12 through the gap 12d, and the internal pressure of the outer container 12 in which the heat insulating material 13 is accommodated is The rise can be prevented.
As a result, during the heat treatment of the workpiece W in the heating furnace 52, the internal pressure of the outer container 12 continues to rise, the internal temperature of the outer container 12 rises, and it is difficult to accurately measure the temperature with the temperature measuring tool 20. Or the heat-resistant container 10 can be prevented from being damaged.

On the other hand, when the heat-resistant container 10 is in a low-temperature environment, the pressure release hole 12c is airtightly and liquid-tightly closed by the plug member 15, so that moisture contained in the heat insulating material 13 passes through the pressure release hole 12c. It is not released to the outside.
Therefore, even if evacuation (decompression) is performed in the purge chamber 51 in which the heat-resistant container 10 is disposed, the moisture contained in the heat insulating material 13 evaporates and is released from the pressure release hole 12c to the outside of the heat-resistant container 12. It will not be done.
Thereby, the pressure reduction time in the purge chamber 51 can be shortened, and it can be prevented that the moisture contained in the heat insulating material 13 is reduced and the heat resistance of the heat resistant container 10 is lowered.

  As described above, in the heat-resistant container 10, in a low-temperature environment such as in the purge chamber 51 before being heated in the heating furnace 52, the internal moisture is not released to the outside, and is not in the heating furnace 52. Under such a high temperature environment, it is possible to prevent the internal pressure from rising by releasing the internal steam to the outside.

Further, a seal member is preferably interposed between the pressure release hole 12c and the plug member 15 in order to improve the air tightness and liquid tightness of the pressure release hole 12c in a low temperature environment.
As a sealing member interposed between the pressure release hole 12c and the plug member 15, for example, vacuum grease such as silicon grease can be used, and the vacuum grease is applied between the pressure release hole 12c and the plug member 15. By doing so, it becomes possible to improve the airtightness and liquid tightness of the pressure release hole 12c in a low temperature environment, and to improve the hermeticity of the outer container 12 in the heat-resistant container 10.

  In the present embodiment, the heat-resistant container 10 accommodates a temperature measuring tool 20 for processing temperature measurement data, but a measuring tool for processing the measurement data of the strain of the workpiece W during the heat treatment, etc. It is also possible to accommodate other measuring instruments.

DESCRIPTION OF SYMBOLS 1 Temperature measuring device 5 Heat processing apparatus 10 Heat-resistant container 11 Inner container 12 Outer container 12c Pressure release hole 13 Heat insulating material 15 Plug member 20 Temperature measuring tool 30 Thermocouple 51 Purge chamber 52 Heating furnace

Claims (2)

An inner container containing a measuring instrument for processing measurement data;
An outer container containing the inner container;
A heat insulating material filled between the inner and outer containers and containing moisture;
A heat-resistant container comprising
The outer container has a communication hole that communicates the inside and the outside of the outer container,
The communication hole is closed by a plug member made of a material having a lower coefficient of thermal expansion than the outer container.
A heat-resistant container characterized by that. A seal member is interposed between the communication hole and the plug member.
The heat-resistant container according to claim 1.

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