JP2011043376A - Heat-resistant case - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat-resistant case suited for protecting a measuring device for measuring a physical quantity of a workpiece while being heated, from a heating environment. <P>SOLUTION: The heat-resistant case 20 includes an internal container 26 for housing the measuring device body 40, an external container 30 for housing the internal container 26, and a porous material 28 which is arranged in the space between the internal container 26 and the external container 30 and contains moisture. The internal container 26 and the external container 30 are sealed containers which do not allow moisture to pass through. Even if the moisture contained in the porous material 28 evaporates when heated, the internal container 26 prevents steam from entering a housing part 22 where the measuring device body 40 is housed. An increase in the pressure of the housing part 22 is suppressed. Moreover, the external container 30 prevents the steam from being emitted outside the heat-resistant case 20. A change in the atmosphere inside the heating device is suppressed. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a heat-resistant case for a measuring device that measures a physical quantity of a workpiece being heated.

  In order to determine appropriate values for the temperature and heating time of the workpiece in the heat treatment, it may be important to grasp the physical state of the workpiece throughout the heat treatment. For example, in the quenching process, the workpiece is heated for a long time and then immersed in a liquid to rapidly cool the surface. Depending on the type of workpiece, the workpiece is heated to around 1000 degrees and then rapidly cooled to around 100 degrees. For proper quenching, it is preferable to manage the change in temperature of the workpiece during quenching over time. Therefore, in order to grasp the relationship between the degree of heating of the heating device and the physical state of the workpiece, it is desired to measure the physical state of the workpiece in the heat treatment over time. Here, the typical physical state includes the temperature and strain amount of the workpiece. Some probes, such as thermocouples and strain gauges, for measuring the physical state of a workpiece can withstand harsh temperature environments, but the main body of measurement devices including electronic devices such as data loggers is such harsh temperature environments. It cannot withstand (for example, the environment in the quenching process described above). In order to protect the measurement device main body from such a severe temperature environment, the measurement device main body is sometimes used while being housed in a heat-resistant case. For example, Patent Document 1 proposes a heat-resistant case that is double-covered with a gypsum container formed using a gypsum material and a heat insulating container using a heat insulating material that further accommodates the gypsum container. In the technique of Patent Document 1, the temperature rise in the gypsum container is maintained at about 100 degrees, which is the evaporation temperature of crystal water, due to the latent heat of evaporation of crystal water contained in the gypsum material. Realized.

JP 2009-75076 A

  However, the heat-resistant case of Patent Document 1 does not have a structure for holding crystal water contained in the gypsum material in the gypsum container. Therefore, when crystallization water evaporates during heating and water vapor enters the housing part in which the measurement device body is housed, the internal pressure of the housing part may increase and the measurement device body may break down. Further, when water vapor is released to the outside of the heat-resistant case, the atmosphere inside the heating device changes and the workpiece cannot be heated under desired conditions.

  An object of this invention is to provide the heat-resistant case suitable for protecting the measuring device which measures the physical quantity of the workpiece | work under heating from the environment of a heat processing in view of the said subject. Note that the term “workpiece” used in the present specification is not limited to a workpiece to be quenched, and is not limited to a component in the middle of a manufacturing process. The “workpiece” in this specification means a general object to be heated.

  The novel heat-resistant case disclosed in this specification is a heat-resistant case for a measuring device that measures a physical quantity of a workpiece being heated, and includes an inner container, an outer container, and a porous material. The inner container accommodates the measurement device body. The outer container stores the inner container. The porous material is disposed in a space between the inner container and the outer container. The porous material contains moisture. The inner container and the outer container are sealed containers that do not allow moisture to pass through. In this heat-resistant case, the moisture contained in the porous material suppresses the temperature rise of the inner container while being heated. If water evaporates, the temperature rise of the inner container is suppressed by the latent heat of vaporization. Even when the moisture contained in the porous material evaporates, the inner container does not allow moisture to pass therethrough, so that the measurement device main body accommodated therein does not break down due to moisture. Further, since the inner container prevents moisture from entering, the internal pressure does not increase. Further, the external container prevents water vapor from leaking outside the heat-resistant case. As a result, the atmosphere inside the heating device does not change, and the heating environment of the workpiece does not change.

  The novel heat-resistant case disclosed in the present specification can retain a large amount of moisture in the bubbles formed therein by using a porous material. The “porous material” means a member in which many bubbles are formed inside. Moreover, even when water evaporates during heating, the increase in pressure in the space between the inner container and the outer container can be kept low by utilizing the gas volume contained in the bubbles.

  In the novel heat-resistant case disclosed in this specification, it is preferable that a porous material containing moisture surrounds the inner container. As a result, intrusion of heat from all directions to the inside of the inner container can be suppressed, and the heat insulation of the inner container can be improved.

  The present invention provides a heat-resistant case suitable for protecting a measuring device for measuring a physical quantity of a workpiece being heated from a heating environment of the workpiece.

FIG. 1 is a schematic diagram of a heat resistant data recording apparatus 10 including a heat resistant case 20. FIG. 2 is a longitudinal sectional view of the heat-resistant case 20 taken along the line II-II in FIG. FIG. 3 shows the temperature distribution of the heat-resistant case 20 during the heat treatment. FIG. 4 shows the temperature measurement result of the housing part 22 during the heat treatment. FIG. 5 shows a partial longitudinal sectional view of the heat-resistant case 120 of the second embodiment.

The main features of the embodiment described below will be summarized.
(Feature 1) The heat-resistant case has a cylindrical outer shape.

  FIG. 1 is a schematic diagram of a heat-resistant data recording apparatus 10 that measures changes in strain and temperature of the workpiece 18 during heat treatment. The heat-resistant data recording device 10 is arranged in the heating device together with the workpiece 18 and measures the strain amount and temperature change of the workpiece 18 over the entire heat treatment. The heat resistant data recording apparatus 10 includes a measuring device and a heat resistant case 20. The measurement device includes probes 14 and 16 such as thermocouples and strain gauges attached to the workpiece 18 and a measurement device main body 40 that processes an electric signal obtained from the probe. Some probes 14 and 16 such as thermocouples and strain gauges can withstand a severe temperature environment in the heat treatment, but the measurement device body 40 typically includes an electronic circuit that processes an electrical signal obtained from the probe. Including a memory for recording data, the heat-resistant temperature is approximately 150 ° C. or lower. Therefore, the measurement device main body 40 is housed and used inside the heat-resistant case 20 that protects the measurement device main body 40 from the temperature environment of the heat treatment.

  FIG. 2 is a schematic longitudinal sectional view of the heat-resistant case 20 taken along the line II-II in FIG. The heat-resistant case 20 includes an inner container 26, a porous material 28, an outer container 30, and an outer container 34.

  The inner container 26 is made of metal and has a cylindrical outer shape. The inner container 26 is formed airtight so as not to allow moisture to pass therethrough. A heat insulating material 24 is packed in the internal container 26, and an internal space 22 is formed inside the heat insulating material 24. The measurement device main body 40 is accommodated in the internal space 22. Hereinafter, the internal space 22 may be referred to as a housing portion 22 for housing the measurement device main body 40.

  The porous material 28 is, for example, a brick or a heat-resistant foam material, and has a cylindrical outer shape. The porous material 28 surrounds the inner container 26. The porous material 28 contains moisture. The porous material 28 contains a large number of bubbles therein, and most of the moisture is retained in the bubble portions. Here, “containing water” may be included in the porous material 28 as crystal water or the like, or may be included in a normal liquid state.

  The outer container 30 is made of metal and has a cylindrical outer shape. The outer container 30 surrounds the porous material 28 and is formed airtight so as not to allow moisture to pass therethrough. A heat insulating material 32 is formed outside the outer container 30 so as to surround the outer container 30. In addition, an outer container 34 is formed so as to surround the heat insulating material 32. The outer container 34 is made of metal and has a cylindrical outer shape. The outer container 34 is formed in an airtight manner and prevents liquid and gas from entering the heat resistant case 20 from the outside. Note that “airtight” in this specification means that not only liquid moisture but also vaporized gaseous moisture cannot pass.

  The inner container 26, the outer container 30, and the outer container 34 can all be divided into upper and lower parts. The code | symbol 36 has shown the boundary surface (division surface) of the upper part of each container, and a lower part. The heat insulating material 24, the porous material 28, and the heat insulating material 32 can also be divided at the boundary surface of the container. In other words, the heat-resistant case 20 can be divided into two at the upper and lower sides by the boundary surface 36. A flange 38 a is formed in the vicinity of the boundary surface 36 on the upper part of the outer container 34. A flange 38 b is formed in the vicinity of the boundary surface 36 in the lower part of the outer container 34. Reference numeral 39 denotes a metal seal, which is disposed between the flange 38a and the flange 38b. The metal seal 39 is compressed by a fastening member such as a bolt or a nut when the upper part and the lower part of the heat-resistant case 20 are sealed, and the airtightness between the upper part and the lower part of the outer container 34 is maintained. Yes. Further, the heat-resistant cable 12 extends from the housing portion 22 of the heat-resistant case 20. The vicinity of the outlet from which the heat-resistant cable 12 extends is also sealed with a metal seal. The heat-resistant case 20 is kept airtight by the airtightness of the outer container 34 and the metal seal, and protects the internal measurement device body 40 even when the work 18 is heated not only in the gas but also in the liquid. 18 physical quantities can be measured.

  The measurement device main body 40 includes a battery 42, a data recording unit 44, and a temperature compensation circuit 46. The battery 42 supplies power to the data recording unit 44 and the temperature compensation circuit 46. The data recording unit 44 is a data logger that records electrical signals obtained from the probes 14 and 16. The data recording unit 44 is connected to the thermocouple probe 14 and stores an electrical signal input from the probe 14. The data recording unit 44 is connected to the strain gauge probe 16 via the temperature compensation circuit 46. The electrical signal input from the probe 16 not only changes according to the strain amount of the work 18 but also changes according to the temperature change of the work 18. The temperature compensation circuit 46 removes the influence of the temperature change of the workpiece 18 from the electrical signal input from the probe 16. The data recording unit 44 records the electrical signal input from the probe 16 and processed by the temperature compensation circuit 46. The data recording unit 44 stores the electrical signal input from the probe 14 and the electrical signal input from the probe 16 in synchronization. By correcting the strain amount data using the temperature data stored in synchronization, the influence of temperature can be more accurately removed from the strain amount data.

  The distance of the heat-resistant cable 12 from the heat-resistant case 20 to the strain gauge probe 16 is preferably short, and more preferably within 0.5 m. As a result, the noise component of the electrical signal input from the probe 16 is greatly reduced.

  When measuring the change over time in the temperature and strain of the workpiece 18 being heated using the heat-resistant data recording device 10, the measuring device body 40 is housed in the heat-resistant case 20 and the probes 14 and 16 are attached to the workpiece 18. Then, the heat-resistant data recording device 10 is disposed in the heating device together with the workpiece 18 to perform the heat treatment. For example, the heating device for quenching heats the heat-resistant data recording device 10 together with the workpiece 18 to about 950 ° C. In the heat resistant case 20, when the temperature of the porous material 28 exceeds 100 ° C., the moisture contained in the porous material 28 starts to evaporate. While the water contained in the porous material 28 evaporates, the temperature of the porous material 28 is maintained around 100 ° C. by the latent heat of water evaporation as shown in FIG. FIG. 4 shows, as an example, the result of measuring the temperature in the housing portion 22 during the heat treatment in the quenching process. In the heat-resistant case 20, the temperature of the porous material 28 is maintained at around 100 ° C. As a result, the temperature of the housing portion 22 is also suppressed to about 100 ° C. Rise to about 150 ° C. is prevented.

  In the heat-resistant case 20 of the embodiment, an inner container 26 that is airtightly formed inside the porous material 28 is provided. The inner container 26 prevents water vapor from entering the housing portion 22 even when the water contained in the porous material 28 evaporates. Thereby, the measurement device main body 40 accommodated in the accommodating part 22 does not break down due to moisture. Further, the pressure in the housing portion 22 is prevented from rising to the breaking pressure of the measurement device body 40.

  Further, in the heat-resistant case 20 of the embodiment, an external container 30 that is airtightly formed outside the porous material 28 is provided. Even when the water contained in the porous material 28 evaporates, the outer container 30 prevents the water vapor from being released into the heating device outside the heat resistant case 20. This prevents the heating state in the heating device from changing.

  In the heat resistant case 20 of the embodiment, the inner container 26 and the outer container 30 are formed in an airtight manner. Therefore, when the moisture contained in the porous material 28 evaporates, the pressure in the space between the inner container 26 and the outer container 30 increases. In the heat resistant case 20 of the embodiment, the porous material 28 is disposed in this space. The porous material 28 has many bubbles formed therein. Therefore, the increase in pressure in the space between the inner container and the outer container can be kept low by utilizing the gas volume contained in the bubbles.

  Moreover, the inner container 26 and the outer container 30 have a cylindrical shape. The cylindrical shape has higher rigidity than the square shape and is not easily deformed with respect to an increase in internal pressure.

  In the quenching process, after the heat treatment, the workpiece 18 is taken out of the heating device and cooled. In addition to recording during the heating period, the heat-resistant data recording apparatus 10 can also record the amount of strain of the workpiece 18 during cooling and changes in temperature over time. That is, the heat-resistant data recording device 10 may be taken out of the heating device together with the workpiece 18, and the heat-resistant data recording device 10 may be cooled together with the workpiece 18. After the heat-resistant data recording apparatus 10 is cooled, the measuring device body 40 is taken out from the heat-resistant case 20, and the strain amount data and temperature data recorded in the data recording unit 44 are transferred to the computer.

  As described above, the heat resistant case 20 of the embodiment can improve the heat resistance by adding moisture to the porous material 28. Further, the provision of the inner container 26 and the outer container 30 causes problems that may occur when the porous material 28 contains moisture, such as breakage of the measurement device main body 40 and changes in heating conditions of the workpiece 18. Occurrence is prevented. As described above, the technique disclosed in this specification realizes a heat-resistant case suitable for protecting a measuring device that measures the physical quantity of the workpiece 18 being heated from the heating environment.

  In FIG. 5, the fragmentary longitudinal cross-section of the heat-resistant case 120 of Example 2 is shown. FIG. 5 is a cross-sectional view illustrating a structure inside the outer container 130 of the heat resistant case 120. In the heat-resistant case 120, a screw part 150 that engages with each other is formed on the upper part and the lower part of the inner container 126, and a screw part 154 that engages with each other also on the upper part and the lower part of the outer container 130. Is formed.

  In the heat resistant case 120, when the measurement device main body 40 is accommodated in the accommodating portion 22 and the inner container 126 is sealed, the O-ring 152 is disposed on the screw portion 150 and the screw portion 150 is fastened. The O-ring 152 hermetically seals the boundary surface 36 between the upper part and the lower part of the inner container 126. Thereby, it is possible to effectively suppress the moisture contained in the porous material 28 from entering the housing portion 22.

  Further, in the heat resistant case 120, when the measurement device main body 40 is accommodated in the accommodating portion 22 and the outer container 130 is sealed, the O-ring 156 is disposed on the screw portion 154 and the screw portion 154 is fastened. The O-ring 156 hermetically seals the boundary surface 36 between the upper part and the lower part of the outer container 130. Thereby, it is possible to effectively suppress the moisture contained in the porous material 28 from being released to the outside of the heat resistant case 120.

Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.
The liquid contained in the porous material 28 is not limited to water and may be a liquid. As the liquid contained in the porous material 28, a liquid having a relatively large latent heat of vaporization may be used like water. Furthermore, latent heat of fusion of a solid substance may be used. For example, a substance that is solid at room temperature, melts by heating, and has a relatively large latent heat of fusion is used. When this substance melts during heating, the inside of the inner container can be kept near a certain temperature due to the latent heat of fusion.

  The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or the drawings can achieve a plurality of objects at the same time, and has technical usefulness by achieving one of the objects.

10: heat-resistant data recording device 12: heat-resistant cable 14, 16: probe 18: work 20: heat-resistant case 22: housing 24: heat insulating material 26: inner container 28: porous material 30: outer container 32: heat insulating material 34: exterior Containers 38a, 38b: Flange 39: Metal seal 40: Measuring device body 42: Battery 44: Data recording unit 46: Temperature compensation circuit 150, 154: Screw unit 152, 156: O-ring

Claims (2)

It is a heat-resistant case for measuring devices that measure the physical quantity of the workpiece being heated.
An internal container for housing the measurement device body;
An outer container for storing the inner container;
A porous material disposed in the space between the inner container and the outer container, containing moisture;
With
A heat-resistant case, wherein the inner container and the outer container are sealed containers that do not allow moisture to pass through.   The heat-resistant case according to claim 1, wherein a porous material containing moisture surrounds the inner container.

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