JP6494012B2 - container - Google Patents

Description

  The present invention relates to a container.

  The casting method has a feature that it is easy to impart a shape to a product, and has become a basic technology for manufacturing many machine parts including those for automobiles. A general casting process includes steps of melting a casting material, injecting a molten material (molten metal) into a container, transporting the container to a casting apparatus, and casting with a casting apparatus using the molten metal.

  By the way, the problem of heat dissipation always exists in containers used for transporting molten metal. That is, the heat of the molten metal injected into the container is released to the outside from the inner surface of the container through the outer surface of the container. Therefore, the temperature of the molten metal in a container falls during conveyance of a container, and the problem that a molten metal of desired temperature cannot be obtained at the time of a casting start may arise. Further, such heat dissipation loss greatly affects the energy efficiency of the entire casting process from the viewpoint of energy loss. When there is a heat dissipation loss from the container into which the molten metal is injected, it is necessary to heat the molten metal injected into the container to an excessively high temperature in advance in order to obtain the molten metal at a predetermined temperature at the start of casting. . However, such a countermeasure significantly increases the energy consumption of the entire process.

  Therefore, in order to suppress a heat dissipation loss from the container into which the molten metal is injected, Patent Document 1 discloses that a wall surface constituting the inner surface of the container has a substantially spherical shape, and the wall surface includes a plurality of hollows made of a heat-resistant material. It has been proposed to be composed of segment members.

  Patent Document 2 proposes that the inner surface of the container is composed of a plurality of hollow segment members made of ceramics, and each segment member has a heat storage part including a material having a specific heat higher than air. Has been.

JP 2009-233744 A JP 2012-000650 A

  However, there is a permanent demand for reduction of heat dissipation loss for a container in which a high-temperature object such as a molten metal is accommodated. Particularly in recent years, from the viewpoint of energy saving, it has become necessary to reduce the heat dissipation loss from the container over a longer time axis. For this reason, even in the container disclosed in Patent Document 1, the degree of reduction in heat dissipation loss has not been sufficient.

  In Patent Document 2, the degree of heat dissipation loss is improved as compared with Patent Document 1, but all segment members constituting the inner surface of the container have a heat storage part, and the heat storage part is, for example, a metal And ceramics. For this reason, there existed a problem that the weight of the whole container became heavy.

  This invention is made | formed in view of said point, Comprising: It aims at providing the container excellent in heat retention and lightweight, and high in energy saving property.

The present invention is a container capable of accommodating an object in an internal chamber formed by an inner surface,
The inner surface is composed of two or more types of segment members having different functions,
At least a part of the inner surface is composed of a heat dissipation suppression segment member having a function of suppressing heat dissipation from the object,
Furthermore, at least a part of the remaining part of the inner surface is composed of a heat storage segment member having a heat storage function,
At least a part of the non-contact portion with the object on the inner surface is composed of the heat dissipation suppression segment member,
Furthermore, at least a part of the contact portion with the object on the inner surface is composed of the heat storage segment member,
The heat dissipation suppression segment member and the heat storage segment member have a wall portion having a hollow structure,
The wall portion of the heat dissipation suppressing segment member is made of aluminum titanate,
The wall portion of the heat storage segment member is made of silicon nitride;
The surface constituting the inner surface of the heat radiation suppressing segment member is a product of the radiant intensity of the black body at each wavelength λ μm at 700 ° C. and the reflectance at the wavelength λ, measured according to JIS R 1693-2. The total reflectance at 700 ° C. obtained by dividing the value integrated in the range of 1 to 25 μm by the value obtained by dividing the radiation intensity of the black body at each wavelength λ of 700 ° C. within the range of wavelength λ = 1 to 25 μm. Is 30% or more, or
Provided is a container in which a film having a total reflectivity at 700 ° C. of 30% or more is formed on a surface constituting the inner surface of the heat radiation suppressing segment member .

  ADVANTAGE OF THE INVENTION According to this invention, it is excellent in heat retention and lightweight, and can provide a container with high energy saving property.

Schematic sectional drawing of the conventional container. The figure which showed the shape of the segment member which comprises the inner surface of the conventional container. The schematic sectional drawing of an example of the container which concerns on embodiment of this invention. The figure which showed schematically an example of the shape of the segment member which comprises the inner surface of the container which concerns on embodiment of this invention. It is a rough section enlarged view of a container concerning an embodiment of the present invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described. However, the present invention is not limited to the following embodiments, and various modifications and changes can be made to the following embodiments without departing from the scope of the present invention. Substitutions can be added.

  In the present embodiment, a configuration example of the container of the present invention will be described.

  In order to better understand the characteristic configuration of the container of the present embodiment, first, the configuration of a conventional container will be briefly described with reference to FIGS. 1 and 2.

  In FIG. 1, sectional drawing of the conventional container 1 of patent document 1 is shown. FIG. 2 shows the shape of the segment member 10 used in the conventional container 1.

  As shown in FIG. 1, the conventional container 1 has the housing | casing 5 comprised, for example with the metal. A plurality of segment members 10 are arranged on the inner surface of the housing 5 with an inorganic filler 7 interposed therebetween, and the inner surface 30 of the container 1 is formed by these segment members 10. The inner surface 30 of the container 1 defines a container inner chamber 35.

  Furthermore, the container 1 has an upper lid 50 in order to allow the molten metal to be poured into the inner chamber 35 of the container 1. The upper lid 50 is composed of the housing 5, the inorganic filler 7, and the segment member 10, similarly to the other parts of the container 1. The upper lid 50 is provided so as to be freely opened and closed by a known hinge mechanism 52 or the like, and the inner chamber 35 is sealed when the upper lid is closed.

  The segment member 10 is made of hollow ceramics. Each segment member 10 is mutually arranged so that inner surface 30 may become substantially spherical.

  Each segment member 10 has a shape shown in FIG. Here, FIG. 2A is a top view of the segment member 10, and FIG. 2B is a side view of the segment member 10 when viewed from the direction of the arrow P1 (see FIG. 2A). (C) is a bottom view of the segment member 10.

  As shown in FIG. 2, the segment member 10 has a columnar shape having a top surface 11 and a bottom surface 12 that are parallel to each other, and side surfaces 13 (13A to 13E).

  As described above, the segment member 10 has a hollow structure. That is, a space is formed between the upper surface 11 and the bottom surface 12 of the segment member 10. In other words, the inner part partitioned by the five side surfaces 13A to 13E is hollow.

As shown in FIG. 2B, the top surface 11 and the bottom surface 12 are curved toward the upper side of the figure, and are convex toward the upper side. The curvature of this surface is designed so that when the plurality of segment members 10 having the same shape are arranged to form the inner surface 30 of the container, the inner surface is substantially spherical. Further, as shown in FIG. 2A, the upper surface 11 has a pentagonal shape and includes three short sides LU1 to LU3 having the same length and two long sides LU4 and LU5 having the same length. . The angle θ ₁ between the two long sides LU4 and LU5 is 67.45 °, and the angle θ ₂ between the other sides is 118.14 °. The ratio of the length of the long side to the short side is 1: 1.75. Similarly, the bottom surface 12 has a pentagonal shape and includes three short sides LD1 to LD3 having the same length and two long sides LD4 and LD5 having the same length. The relationship between each of these sides and the angle between them is the same as in the case of the upper surface 11. However, as can be seen from FIG. 2, the bottom surface 12 has a reduced shape while maintaining a similar shape to the top surface 11. Therefore, the five side surfaces 13 of the segment member 10 are shown in FIG. In this way, the upper surface 11 is inclined toward the bottom surface 12. The height of the side surface 13 in the vertical direction is represented by G.

In FIG. 2B, the angle θ ₃ formed between the ridge line of each of the side surfaces 13A to 13E and the vertical line is about 10 °. However, this is an example, and the angle θ ₃ may be another angle as long as the two segment members can be arranged adjacent to each other without interference.

  By arranging 60 segment members 10 having such shapes vertically and horizontally, the substantially spherical inner surface 30 of the container 1 can be formed.

  In such a container 1, the surface area of the inner surface 30 can be made relatively small with respect to the volume of the inner chamber 35. Here, when the surface area of the inner surface 30 is reduced, the area of the portion where the molten metal accommodated in the inner chamber 35 is in contact with the container 1 is reduced, and the amount of heat transferred through this portion is also reduced. Therefore, in such a container 1, the heat dissipation loss from the container can be significantly suppressed as compared with a container having a substantially prismatic or substantially cylindrical inner chamber.

  However, as described above, there is a permanent demand for further reduction of heat dissipation loss for containers that accommodate high-temperature objects such as molten metal. In particular, in recent years, from the viewpoint of energy saving, it is necessary to reduce the heat dissipation loss with respect to a longer time axis, and the container is required to further reduce the heat dissipation loss.

  Therefore, even in the container 1, it is difficult to say that the effect of suppressing the heat radiation loss is still sufficient.

  Under such a background, the inventors of the present application promoted earnest research and development, further suppressed heat dissipation loss from the container, and enhanced the energy saving effect. The present inventors have found that it is important to design a new container that can achieve both weight reduction and the present invention.

  “Heat retention” is one index representing the ability of a container to maintain the high temperature of a high-temperature object accommodated in the container. A container having a higher “heat retention” is accommodated in the container. The rate of decrease of the temperature of the hot object with respect to time can be kept small.

  “Heat retention” is also an index indicating the ease of heat energy dissipation from the container. The higher the “heat retention”, the more difficult the heat release from the container, that is, the heat dissipation loss. It can be said that there are few, and a high energy-saving effect is exhibited.

For simplicity, assuming that the container is composed only of hollow segment members as shown in FIG. 2, the “heat retention” of the container can be conveniently expressed by the following formula:

“Heat retention” = 1 / ΔT Equation (1)

Here, ΔT (K) is a temperature change amount per unit time on the surface in contact with the high temperature object, that is, the bottom surface of the segment member (inner surface of the container), and the bottom surface of the segment member at time t ₁ (sec). Is T ₁ (K), and the temperature of the bottom surface of the segment member at time t ₂ (sec) (t ₂ > t ₁ ) is T ₂ (K),

ΔT = T ₁ −T ₂ formula (2)

Can be expressed as

On the other hand, the temperature change ΔT on the bottom surface of the segment member is

ΔT = ΔQ / (c _S M _S + c _A M _A ) Formula (3)

Can be expressed as Here, ΔQ is the amount of heat released from the segment member (J), c _S is the specific heat of the segment member (J / kg · K), _MS is the mass (kg) of the segment member, c _a is the specific heat of the high temperature object (J / kg · K), M a is the mass of hot objects (kg).

The heat dissipation amount ΔQ is

ΔQ = k · S · t (T _in −T _out ) Equation (4)

Can be expressed as Here, k is the heat transmission rate (W / m ² · K) through the segment member, and δ is the height (m) of the side surface of the segment member (approximately the length G / cos θ ₃ in FIG. 2B). And λ is the thermal conductivity of the segment member (W / m · K),

k = λ / δ Formula (5)

It is represented by

Further, in the equation (4), S is the heat transfer area of the segment members ^{(m 2),} t is the time _{(sec), T in} is the temperature of the bottom surface of the segment member (K), T _out is the temperature (K) of the upper surface of the segment member.

In the case of the segment member 10 having a shape as shown in FIG.

S = S ₁₁ + S ₁₂ + S ₁₃ formula (6)

In expressed, _{wherein, S 11} is (in FIG. 2 (a), the edge area of a region surrounded by LU1~ sides LU5) area of the upper surface 11 of the segment member _{is, S 12} is the bottom surface of the segment member 12 (the area of the region surrounded by the side LD1 to the side LD5 in FIG. 2C). _{Further, S 13} represents a heat transfer area of the side surface 13A~13E segment member, which, for each of the five sides 13A~13E shown in FIG. 2 (a), the area of the cross section in the horizontal direction, the bottom surface 12 side To the upper surface 11 side (that is, over the length G).

In equation (3), the heat release amount ΔQ of the molecule is an index representing “heat insulation”, and the heat insulation of the container increases as the heat release amount ΔQ decreases. On the other hand, _c S _{M S} of the denominator _{(c S M S + c A} M A) becomes an index representing the "heat storage" of the _container, as c S _{M S} is large, heat accumulation of the container is greater Become.

Similarly to the equation (1), for convenience, “heat insulation” = 1 / ΔQ and “heat storage” = (c _S M _S + c _A M _A ) = "Insulation" x "heat storage".

  Therefore, from equation (3), by increasing the “thermal insulation” of the container and / or increasing the “thermal storage” of the container, the temperature change ΔT of the container can be reduced, that is, the “heat insulation” of the container. It can be said that it can improve "sex". Moreover, it is thought that this can suppress the heat dissipation loss of a container and can improve an energy-saving effect.

  Here, from the equations (4) and (5) representing the heat radiation amount ΔQ, the thermal conductivity λ of the segment member is reduced, the side surface height δ is increased, and / or the heat transfer area S of the segment member is increased. By reducing the heat dissipation amount ΔQ, the “heat insulation” of the container can be enhanced. However, increasing the height δ of the side surface of the segment member increases the size of the container, which is not preferable in terms of transport efficiency and handling properties. Therefore, in order to improve the “heat insulation” of the container, it is preferable to reduce the heat transfer area S of the segment member as much as possible.

In general, the heat transfer area S ₁₂ of the bottom surface 12 of the segment member, since uniquely determined by the shape of the inner surface of the container, it is not possible to significantly change. Therefore, from the formula (6), in order to increase the “heat insulation” of the container, it is preferable to make the heat transfer area S _{11 on} the upper surface and / or the heat transfer area S ₁₃ on the upper surface of the segment member as small as possible. It can be said.

On the other hand, with respect to the denominator term (c _S M _S + c _A M _A ) of the formula (3) representing the “heat storage property” of the container, the specific heat c _A and the mass M _A of the high-temperature object accommodated in the container are constant. Can be assumed. For this reason, it is considered that the “heat storage property” of the container can be increased by increasing the specific heat c _S and the mass M _S of the segment member.

By increasing the "heat storing property" of the container, although it is possible to enhance the "warmth" of the container as described above, since the larger (heavy) mass M _S simultaneously segmented members, also the mass of the container as a result of heavy Problem arises.

  As described above, in order to increase the “heat retaining property” of the container, it is preferable to use a segment member having “heat insulating property” and “heat storage property” improved at the same time on the entire inner surface of the container. However, since the mass of the heat storage segment member with enhanced “heat storage property” increases as described above, the weight of the container may be impaired when only the heat storage segment member is used. For this reason, in the container of this embodiment, it is possible to provide a container with excellent heat retention and light weight by arranging segment members having different functions depending on the inner surface portion of the container. did.

  Therefore, in the container according to the present embodiment, the container can store an object in the inner chamber formed by the inner surface, and the inner surface can be configured with two or more types of segment members having different functions. it can.

  In the container of this embodiment, the inner surface of the container is composed of two or more types of segment members having different functions. That is, the inner surface of the container is not constituted only by the segment member having the same function as in the prior art, but the segment member having the optimum function can be arranged according to the portion of the inner surface of the container. For this reason, it becomes possible to make it compatible with light weight, improving heat retention.

  Below, the specific structural example of the container of this embodiment is demonstrated.

  In FIG. 3, an example of schematic sectional drawing of the container 100 of this embodiment which can accommodate a high temperature object is shown.

  Here, the object accommodated in the container 100 may be a liquid or a solid, but is preferably a high-temperature object. For example, a molten metal (molten metal) is mentioned as an object accommodated in the container, and the metal contained in the molten metal may be a metal or an alloy such as aluminum, magnesium, zinc, and iron. In particular, the metal contained in the molten metal includes aluminum and / or an aluminum alloy. In the following description, the case where the object accommodated in the container is a molten metal will be described as an example. However, as described above, the object accommodated in the container may be a solid or a liquid other than the molten metal, and is limited to the molten metal. Is not to be done.

  The container 100 can have a housing 105 made of a metal such as stainless steel. A plurality of segment members 110, which will be described in detail later, can be arranged on the inner surface of the housing 105, for example, via an inorganic filler 107. By these segment members 110, the inner surface 130 of the container 100 can be formed. Note that the inorganic filler 107 is not necessarily provided.

  The inner surface 130 of the container 100 forms an inner chamber 135 of the container. Accordingly, the inner surface 130 is in direct contact with the molten metal contained in the container 100. On the other hand, the housing 105 is not in direct contact with the molten metal accommodated in the inner chamber 135 of the container 100 because of the segment member 110 and the inorganic filler 107. As will be described later, the segment member 110 can have, for example, a wall portion having a hollow structure, and the outer shape of the segment member 110 can be formed by the wall portion.

  Here, the term “hollow” refers to a structure having a cavity between the upper surface and the bottom surface (which may be virtual surfaces) of the wall portions of the segment member, or a plurality of side surfaces (these are: This means a structure having a cavity in the inner part partitioned by a virtual surface.

  Although not shown in the drawing, another layer such as an inorganic fiber layer is provided between the housing 105 and the inorganic filler 107 and / or between the inorganic filler 107 and the segment member 110. May be. However, such layers are known to those skilled in the art and will not be described further here.

  This other container 100 can have an upper lid 150 to allow molten metal to be poured into the inner chamber 135 of the container 100. The upper lid 150 can be composed of the housing 105, the inorganic filler 107, and the segment member 110, similarly to the other parts of the container 100. The upper lid 150 is provided so as to be openable and closable by, for example, a known hinge mechanism 152, and the inner chamber 135 is sealed when the upper lid is closed. In other words, the inner surface 130 of the container is continuously constructed when the top lid 150 is closed.

  Further, in the example of the container 100 shown in FIG. 3, the molten metal in the container 100 can be discharged to the outside from the open portion formed by opening the upper lid 150 with the upper lid 150 opened. However, the present invention is not limited thereto, and a discharge port capable of discharging the molten metal to the outside may be provided at an appropriate portion of the container 100, and the molten metal may be discharged to the outside through this discharge port.

  Moreover, in order to stabilize the installation state of the container 100, a pedestal or a leg may be provided on the bottom surface of the container 100.

  Here, in the container 100 according to the present embodiment, the inner surface 130 can be configured by the segment member 110 having two or more different functions as described above.

  Specifically, for example, at least a part of the inner surface 130 can be constituted by a heat radiation suppressing segment member having a function of suppressing heat radiation from an object, for example, molten metal.

  The heat dissipation suppressing segment member has a function of suppressing heat dissipation from the molten metal. Specifically, for example, it can be configured to suppress radiant heat transfer from molten metal. Therefore, by configuring a part of the inner surface 130 of the container 100 with a heat dissipation suppressing segment member, it is possible to improve the “heat retention” of the container 100.

  When at least a part of the inner surface 130 is configured with a heat dissipation suppression segment member having a function of suppressing heat dissipation from an object, the range in which the heat dissipation suppression segment member is disposed is not particularly limited and can be arbitrarily set. . For example, the heat radiation suppressing segment member is the liquid level of the molten metal in the container 100 indicated by the dotted line A in the figure on the inner surface 130 (when the object accommodated in the container 100 is solid, the upper limit line of the accommodated solid It is preferable that it is a part above. That is, it is preferable that the non-contact portion with the object, for example, molten metal, on the inner surface 130 is configured by the heat radiation suppressing segment member. In this case, the inner surface portion of the upper lid 150 can be similarly configured with a heat radiation suppressing segment member.

  Here, considering the form of heat transfer from the object, for example, the molten metal to the inner surface of the container, on the inner surface 130 of the container 100, first, a portion above the liquid level of the molten metal in the container 100 (molten metal). It is considered that heat transfer by radiation from the liquid surface of the molten metal is dominant. On the other hand, since the molten metal and the inner surface 130 of the container 100 are in close contact with each other at a portion below the liquid level of the molten metal in the container 100 (contact portion with the molten metal), heat transfer by radiation is particularly considered. It is considered unnecessary.

  And the heat dissipation suppression segment member can suppress, for example, radiant heat transfer from molten metal as described above. For this reason, as described above, the heat radiation suppressing segment member can exert its effect particularly by being disposed, for example, in a portion above the liquid level of the molten metal, that is, in a non-contact portion with the molten metal.

  Furthermore, the heat dissipation suppression segment member can be a segment member that is lighter than the heat storage segment member having a heat storage function. For this reason, the container 100 can be reduced in weight by configuring a part of the inner surface 130 with the heat radiation suppressing segment member as compared with the case where the inner surface 130 is configured with only the heat storage segment member.

  In addition, the container 100 according to the present embodiment includes, for example, a part of the inner surface 130 made of a heat radiation suppressing segment member having a function of suppressing heat radiation from an object, for example, molten metal, and at least one of the remaining part of the inner surface 130. A part can be comprised with the thermal storage segment member which has a thermal storage function. In addition, a part of the inner surface 130 may be configured by the heat dissipation suppression segment member described above, and the remaining portion of the inner surface may be configured by the heat storage segment member described above.

  As described above, when a part of the inner surface 130 is constituted by the heat radiation suppressing segment member and at least a part of the remaining part is constituted by the heat storage segment member, the arrangement of each segment member is not particularly limited, and is arbitrarily arranged. Can do. For example, an object on the inner surface 130 of the container 100, for example, a non-contact portion with molten metal, can be configured with a heat dissipation suppression segment member having a function of suppressing heat dissipation from the object. Furthermore, the contact part with the object in the inner surface 130 can be comprised with the thermal storage segment member which has a thermal storage function.

Comparison In formulas heat storage segments members described above having a heat storage function (3), the specific heat _{c S} and mass _{M S} in the denominator term _{(c S M S + c A} M A), and no segment member heat storage And can be enlarged. Then, by arranging the heat storage segment member on the inner surface 130 of the container 100, the “heat storage property” of the container 100 can be enhanced. For this reason, by arranging the heat storage segment member on the inner surface of the container 100, the “heat retention” of the container 100 can be further enhanced. However, in order to sufficiently increase the “heat storage property” of the container 100, it is preferable that the mass M _S of the heat storage segment member is increased (heavy) as is apparent from the above-described formula (3). The total mass of the container 100 will also increase. For this reason, as described above, a part of the inner surface 130 of the container 100 is configured by the heat dissipation suppression segment member, and the heat storage segment member is disposed on at least a part of the remaining portion of the inner surface 130, whereby “ While increasing the “heat storage property”, an increase in the mass of the container 100 can be suppressed and the weight can be reduced.

  Further, when a heat storage segment member is disposed on a portion of the container 100 that is not in contact with the molten metal, for example, on the inner surface of the upper lid 150, when the upper lid 150 is opened and closed, the heat accumulation segment member disposed on the inner surface of the upper lid 150 or its surroundings stores heat. The generated heat may exchange heat with the outside air to cause a heat dissipation loss. For this reason, by making the range which arrange | positions a thermal storage segment member among the inner surfaces 130 of the container 100 as mentioned above, for example in the part below the liquid level of the molten metal which does not contact with external air at the time of opening and closing of the upper cover 150 In addition, it is possible to particularly suppress the heat dissipation loss from the container 100. In this case, for example, as described above, the heat radiation suppression segment member can be disposed on the inner surface 130 of the non-contact portion above the liquid level of the molten metal.

  In addition, even if it is the same container 100, it is possible that the contact part and non-contact part with the object in the inner surface 130 of the container 100 used by description change depending on the state at the time of use. For this reason, the non-contact part here does not mean a non-contact part with an object accommodated in the container 100 in a strict sense. For example, a liquid level line (accommodated object) set in the container 100 in advance. The upper part of the upper limit line) can be a non-contact part. Moreover, also about a contact part, a lower part can be made into a contact part rather than the liquid level line preset for the container 100, for example.

  Specific configuration examples of the heat dissipation suppression segment member and the heat storage segment member will be described later.

  Hereinafter, a configuration example of the segment member 110 will be described in detail.

  The above-described heat dissipation suppressing segment member can have a wall portion having a hollow structure. Moreover, the heat storage segment member can also have a wall portion having a hollow structure.

  Specifically, for example, the wall portions of the heat radiation suppressing segment member and the heat storage segment member can have the same shape as the segment member 10 shown in FIG. Hereinafter, the description common to the heat dissipation suppression segment member and the heat storage segment member is also simply referred to as a segment member without distinguishing the two.

  As already described, the segment member 10 shown in FIG. 2 has a columnar shape having a top surface 11 and a bottom surface 12 which are parallel to each other, and side surfaces 13 (13A to 13E).

  The segment member 10 can have a hollow structure. That is, the space between the upper surface 11 and the bottom surface 12 included in the segment member 10 is a cavity. In other words, the inner part partitioned by the five side surfaces 13A to 13E is hollow. And in this embodiment, the part which contains the upper surface 11, the bottom face 12, and the side surface 13 of the segment member 10 shown in FIG. it can. Since the segment member 10 shown in FIG. 2 has already been described, the description thereof is omitted here.

  Another configuration example of the wall portion of the segment member includes a form in which the surface area of the wall portion included in the segment member is reduced. Another configuration example of the wall portion of the segment member will be described with reference to FIG.

  FIG. 4 schematically shows one shape of the wall portion 1101 of the segment member 110 used for the configuration of the inner surface 130 of the container 100. 4A is a top view of the wall portion 1101 of the segment member 110, and FIG. 4B is a wall portion of the segment member 110 when viewed from the direction of the arrow P2 (see FIG. 4A). FIG. 4C is a side view of the wall 1101 of the segment member 110 when viewed from the direction of the arrow P3 (see FIG. 4A), and FIG. It is a bottom view of the wall part 1101. FIG.

  As shown in FIG. 4, the wall portion 1101 of the segment member 110 has an upper surface 111, a bottom surface 112, and side surfaces 113 (113 </ b> A to 113 </ b> E), and the wall portion of the segment member described with reference to FIG. 2 described above. Can have the same columnar shape.

  However, the wall portion 1101 of the segment member 110 shown in FIG. 4 is greatly different in the shape of the side surface and the upper surface from the wall portion of the segment member described with reference to FIG.

  That is, the upper surface 111 of the wall portion 1101 of the segment member 110 shown in FIG. For this reason, the surface area of the upper surface 111 of the wall portion 1101 of the segment member 110 is smaller than that of the wall portion of the segment member described with reference to FIG.

  Similarly, the side surface 113 of the wall 1101 of the segment member 110 illustrated in FIG. 4 has through holes 125 and 128. For this reason, the side surface 113 of the side surface 113 of the wall part 1101 of the segment member 110 is reduced compared with the wall part of the segment member demonstrated using FIG.

  In FIG. 4, the side surface 113 of the wall portion 1101 of the segment member 110 is replaced with a side surface 113A (side surface including short sides LU1 and LD1), 113B (side surface including short sides LU2 and LD2), and 113C (short sides LU3 and LD3). Side surfaces 113A, 113D (side surfaces including long sides LU4, LD4), and 113E (side surfaces including long sides LU5, LD5), the side surfaces 113A to 113C each have two through holes 125 having the same size and shape. (See FIG. 4B). Each of the side surfaces 113D and 113E has six through holes 128 having the same shape and shape (see FIG. 4C).

In the segment member 110 having the wall portion 1101 shown in FIG. 4, the portion of S ₁₁ + S ₁₃ can be reduced in the above-described equation (6), and the heat transfer area S can be suppressed. Therefore, when the inner surface of the container is formed by combining the segment members 110 having the wall portion 1101 having the structure shown in FIG. 4, the heat radiation amount ΔQ of the container is significant compared to the conventional container 1 from the equation (4). The “insulation” of the container can be increased. As a result, from equation (3), the “heat-retaining property” of the container is increased, and the heat dissipation loss of the container is suppressed, and the energy saving effect can be enhanced.

  In the example of FIG. 4, the upper surface 111 of the wall portion 1101 of the segment member 110 has a single through hole 120 having a large cross section at the center. However, the number, size, shape, and arrangement of the through holes formed in the upper surface 111 of the wall 1101 are not particularly limited. Further, the side surfaces 113A to 113C of the wall portion 1101 of the segment member 110 shown in FIG. 4 have two through holes 125 having the same shape with a circular cross section arranged in the vertical direction, and the side surfaces 113D and 113E are It has six through holes 128 having the same shape and a circular cross section. However, the number, size, shape, and arrangement of the through holes formed in the side surfaces 113A to 113E of the wall portion 1101 are not particularly limited. This is because the through hole is provided in the wall portion of the segment member in order to reduce the surface area of the upper surface 111 and the side surface 113 of the wall portion 1101 of the segment member 110 as compared with the segment member 10 as shown in FIG. That's why. For this reason, as long as the surface area of the wall part 1101 can be reduced, the specification of the through-hole to form is not specifically limited.

  Further, the method for reducing the surface area of the wall portion 1101 of the segment member 110 is not limited to the form in which the through holes are provided in the upper surface 111 and the side surface 113. The upper surface 111 and the side surface 113 of the wall part 1101 of the segment member 110 should just have the means to suppress a heat-transfer area. For example, the side surface 113 may have a “column” structure instead of a “surface” shape. In this case, the upper surface 111 and the bottom surface 112 are connected by a plurality of columns. The number, the thickness (cross-sectional area), and the position of the columns are not particularly limited as long as the strength is established. For example, the number of columns may be the same as the number of vertices of the top surface 111 and / or the bottom surface 112 (that is, five in the example of FIG. 4) or may be different. Further, in this case, the material of each “pillar” may be the same or different.

For the same reason, the upper surface 111 of the wall portion 1101 of the segment member 110 may not be present if it is possible in terms of the strength structure. In this case, S ₁₁ = 0 in the equation (6).

  According to the inventors' estimation, the total heat transfer area of the upper surface 111 and the side surface 113 of the wall portion 1101 of the segment member 110 in the state where the minimum strength of the wall portion 1101 of the segment member 110 is maintained is as shown in FIG. Compared to the total heat transfer area of the upper surface 11 and the side surface 13 of the wall portion of the segment member described above, it can be reduced by about 1% to 50%. Here, the heat transfer area of the side surface 113 is proportional to the volume of the side wall, and the volume of the side wall is proportional to the area of the side wall. Therefore, the side wall area is used here as an index of the heat transfer area of the side surface 113.

  For example, in the configuration of FIG. 4A, the heat transfer area of the upper surface 111 is reduced by about 10% to 60% (for example, 12%) by appropriately selecting the dimension (diameter) of the through hole 120 having a circular cross section. Can be made. 4B and 4C, by appropriately selecting the dimensions (diameters) of the through holes 125 and 128 having a circular cross section, the heat transfer areas of the side surfaces 113A to 113E are 5% to 25%. % (For example, 24%). Thereby, the heat transfer area reduction effect of about 20% to 40% (for example, 20%) is obtained in the entire upper surface 111 and side surface 113.

  FIG. 5 shows an enlarged cross-sectional view of a part of the container 100 configured by arranging the segment members 110 on the inner surface of the housing 105. In FIG. 5, no through hole is provided in the upper surface 111 and the side surface 113 of the wall portion of the segment member 110, but the through hole may be formed as described above. In the example shown in FIG. 5, an inorganic filler 107 is installed in the gap between the casing 105 and each segment member 110 and between the segment members 110. By such an arrangement of the segment members, a substantially spherical inner surface 130 can be formed.

  In the wall portion of the segment member 110 described with reference to FIGS. 2 and 4, the upper surface 111 and the bottom surface 112 have an example of a curved surface. However, this curved surface shape is not always necessary, and both surfaces may be flat surfaces. However, when the upper surface or the bottom surface (in particular, the bottom surface 112) has a curved surface as shown in FIGS. 2 and 4, the volume of the inner chamber 135 of the container configured by arranging the segment members is increased. can do. On the other hand, in the segment member 110, when the upper surface 111 and the bottom surface 112 have flat surfaces rather than curved surfaces, for example, an inner surface 130 having a substantially pentagonal hexahedron shape can be formed. The segment member 110 may be formed by combining a plurality of segment members having different shapes to form the inner surface 130 having a substantially spherical or substantially quasi-regular polyhedron shape.

  Furthermore, in the container 100 of this embodiment, the shape of the inner surface 130 does not necessarily have to be spherical or substantially spherical. For example, the shape of the inner surface 130 of the container may be a columnar shape or a prismatic shape. For this reason, the shape of the wall portion of the segment member 110 is not limited to the shape described with reference to FIGS. 2 and 4 so far, and any shape according to the shape of the inner surface of the container to be formed, Can be size.

  The material of the wall portion of the segment member 110 is not particularly limited, and can be arbitrarily selected according to an object accommodated in the container 100, for example, a molten metal. However, since a high-temperature object such as molten metal is planned as an object to be accommodated in the container 100, the wall portion of the segment member 110 is preferably formed of a heat-resistant material, for example, ceramics. That is, the wall portion of the heat dissipation suppressing segment member can be formed of ceramics. Moreover, the wall part of a thermal storage segment member can be formed with ceramics.

  Here, in the present embodiment, the term “ceramics” refers to materials including all inorganic materials except materials consisting only of metals and materials consisting only of organic substances, that is, fine ceramics, composite materials including inorganic materials, and refractory bricks. It is a broad concept including etc. For this reason, it does not specifically limit about the specific material of the ceramics which comprises the wall part of a segment member. When the wall portion is formed of ceramics, the ceramics preferably contains one or more materials selected from aluminum titanate, alumina, spinel, silicon nitride, silicon carbide, and sialon. Note that reactively sintered silicon nitride can be used as silicon nitride, and nitride-bonded silicon carbide can be used as silicon carbide. In particular, aluminum titanate, alumina, spinel, reaction-sintered silicon nitride, nitride-bonded silicon carbide are relatively stable against aluminum and / or aluminum alloy molten metals. For this reason, when a container is used for accommodation of aluminum and / or an aluminum alloy, it is more preferable to use these materials.

  When the container 100 is used for containing molten metal, it is preferable that at least the bottom surface 112 of the wall portion of the segment member 110 is made of a chemically stable material when contacting the molten metal. Thereby, the problem that impurities are mixed in the molten metal due to the interaction between the molten metal and the wall portion of the segment member 110 and the quality of the molten metal is reduced can be suppressed. Furthermore, problems such as breakage of the container 100 due to chemical degradation can be reduced.

  Moreover, it is preferable that the wall thickness of the segment member 110 is as thin as possible from the viewpoint of reducing the heat transfer area. However, an extremely thin wall portion of the segment member 110 is not preferable because the mechanical strength of the member itself decreases. For this reason, for example, the wall thickness of the segment member 110 is preferably in the range of about 1 mm to about 10 mm, and more preferably in the range of about 3 mm to about 8 mm.

  Next, a configuration example other than the wall portion of the heat dissipation suppressing segment member will be described.

  As described above, the heat dissipation suppressing segment member can have a function of suppressing heat dissipation from an object accommodated in the container 100, for example, molten metal. The configuration of the heat dissipation suppression segment member is not particularly limited, and may be configured so as to have a function of suppressing heat dissipation from the object accommodated in the container 100 as described above.

  Since the heat radiation suppression segment member suppresses heat radiation from the object accommodated in the container 100 as described above, the surface constituting the inner surface 130 of the container 100 has a total reflectance at 700 ° C. of 30% or more. Preferably, it is 40% or more.

  Here, the total reflectance can be measured in accordance with JIS R1693-2 (emissivity measurement method of fine ceramics and ceramic composite material-part 2: vertical emissivity by a reflection method using FTIR). For example, a value obtained by integrating the product of the radiant intensity of the black body at each wavelength λ μm at an arbitrary temperature T ° C. and the reflectance at the wavelength λ in the range of wavelength λ = 1 to 25 μm is black at each wavelength λ at an arbitrary temperature T ° C. It can be obtained by dividing the radiation intensity of the body by the value integrated in the wavelength λ = 1 to 25 μm range. In addition, when calculating | requiring the total reflectance in 700 degreeC as mentioned above, arbitrary temperature T will be 700 degreeC.

  As described above, the heat radiation suppressing segment member is preferably disposed in a non-contact portion of the inner surface 130 of the container 100 with the object. And when the heat radiation suppression segment member is arranged in the non-contact portion with the object in the container 100, a part of the heat radiation from the object accommodated in the container 100 is moved in the direction of the heat radiation suppression segment member by radiant heat transfer. . Therefore, the total reflectance at 700 ° C. of the surface constituting the inner surface 130 of the heat radiation suppressing segment member is set to 30% or more, and the heat absorption to the heat radiation suppressing segment member is increased by increasing the reflection on the surface of the heat radiation suppressing segment member. Transmission can be particularly suppressed. For this reason, it becomes possible to suppress especially the heat dissipation from the object accommodated in the container 100. FIG.

  As described above, the heat dissipation suppressing segment member can have the wall portion 1101 having a hollow structure. For this reason, the said total reflectance can be achieved by selecting the material of a wall part, for example. Alternatively, the reflectance can be achieved by surface-treating the bottom surface 112 of the wall portion 1101 that forms the inner surface 130 of the container 100.

  As a method of achieving the reflectance by performing surface processing on the portion constituting the inner surface 130 of the container 100 in the wall portion of the heat radiation suppressing segment member, a coating is applied to the bottom surface 112 constituting the inner surface of the wall portion 1101. The method of forming is mentioned. That is, a film having a total reflectance at 700 ° C. of 30% or more can be formed on the surface constituting the inner surface (of the wall portion) of the heat radiation suppressing segment member, and in particular, the total reflectance at 700 ° C. is 40%. It is more preferable to form the above film. The material of the coating is not particularly limited, and any material can be selected as long as it can achieve the reflectance described above. The coating can include, for example, one or more materials selected from aluminum titanate, alumina, spinel, zirconia, and aluminum. The film thickness of the coating is not particularly limited and can be arbitrarily selected. For example, the thickness is preferably 10 μm or more and 300 μm or less, and more preferably 50 μm or more and 250 μm or less. The method for forming the film is not particularly limited, and examples thereof include a coating method and a sol-gel method.

  Moreover, the heat dissipation suppression segment member can have a heat insulating part having a lower thermal conductivity than the wall part in the internal space of the wall part of the heat dissipation suppression segment member. By providing a heat insulating portion in the internal space of the wall portion of the heat dissipation suppressing segment member, it is possible to further reduce heat dissipation loss. Although the heat insulation part can be formed in the entire internal space of the wall part, for example, it can also be formed only in a part of the internal space.

  The material which comprises a heat insulation part is not specifically limited, The material should just be selected so that a heat conductivity may become lower than a wall part. Moreover, in the container of this embodiment, the weight reduction of the container is aimed at by providing the heat radiation suppression segment member. For this reason, it is preferable to use a material having a lower density in the material constituting the heat insulating portion than the material constituting the heat storage portion. The heat insulating part preferably includes, for example, one or more materials selected from ceramic fibers.

  Up to this point, the heat radiation suppression segment member has been described, but the configuration of the heat radiation suppression segment member arranged in one container does not necessarily have the same configuration, and a heat radiation suppression segment member having a different configuration can also be disposed. . Specifically, for example, a part of the heat radiation suppressing segment member is configured such that a heat insulating portion is disposed in the internal space of the wall portion and a heat insulating portion is not disposed in the internal space of the wall portion of the partial heat radiation suppressing segment member. You can also. Further, for example, a through hole may be provided on the upper surface and / or the side surface of the wall portion of some of the heat radiation suppressing segment members, and no through hole may be provided on the wall portion of some of the heat radiation suppressing segment members.

  Next, a configuration example other than the wall portion of the heat storage segment member will be described.

  The heat storage segment member can have a heat storage function as described above. The configuration of the heat storage segment member is not particularly limited as long as it has a heat storage function as described above.

  As a method of configuring the heat storage segment member to have a heat storage function, for example, a method of arranging a heat storage portion having a specific heat larger than air in the internal space of the wall portion of the heat storage segment member can be mentioned. In this case, although a heat storage part may be arrange | positioned in the whole interior space of the wall part of a heat storage segment member, a heat storage part can also be arrange | positioned in a part of internal space of the wall part of a heat storage segment member. When arrange | positioning a thermal storage part in a part of internal space of the wall part of a thermal storage segment member, the thermal storage part with larger specific heat than air is arrange | positioned in the inner surface 130 side among the internal spaces of the wall part of a thermal storage segment member, for example. be able to. The ratio of the volume of the heat storage part in the internal space of the wall part is not particularly limited, and can be arbitrarily selected according to the required degree of heat storage, the position where the heat storage segment member is disposed, and the like. For example, in the internal space of the wall portion, the heat storage portion preferably occupies 10% or more of the volume on the inner surface 130 side, and more preferably, the heat storage portion occupies 50% or more of the volume on the inner surface 130 side. Moreover, the heat storage part may occupy the whole volume of the internal space of a wall part as mentioned above.

  The configuration of the heat storage unit is not particularly limited, and may be configured with a heat storage material such as metal (including an alloy) and ceramics as long as it is configured with a material having a specific heat larger than that of air as described above. . For example, the heat storage part preferably includes one or more materials selected from silicon carbide, boron carbide, alumina, and aluminum.

  As mentioned above, when the heat storage part occupies a part of the internal space of the wall part of the heat storage segment member, the configuration of the remaining part is not particularly limited, and an arbitrary member can be arranged. . Moreover, it is also possible to leave the space without any particular member. However, in order to further reduce the heat dissipation loss to the outside of the container 100, it is preferable to arrange the heat insulating part in the remaining part of the internal space in which the heat storage part is formed. That is, it is preferable that the heat storage segment member has a heat insulating part having a lower thermal conductivity than the wall part in the remaining part of the internal space of the wall part. Although it does not specifically limit about the structure of a heat insulation part, For example, it can comprise similarly to the case where it demonstrated with the heat insulation part of the thermal radiation suppression segment member.

  By disposing the heat insulating portion in a part of the internal space of the wall portion of the heat storage segment member, it is possible to further reduce heat dissipation loss and improve heat retention. Moreover, the mass of the container 100 is reduced compared with the case where a heat storage part is formed in the whole internal space of the wall part of a heat storage segment member by comprising a part of internal space of the wall part of a heat storage segment member by a heat insulation part. can do.

  So far, the heat storage segment member has been described, but the configuration of the heat storage segment member disposed in one container does not necessarily have the same configuration, and heat storage segment members having different configurations may be disposed.

  Specifically, for example, for some heat storage segment members, a heat insulating portion is arranged in the internal space of the wall portion, and a heat insulating portion is not arranged in the internal space of the wall portion of some heat radiation suppressing segment members. You can also. For example, it can also comprise so that the material which comprises the heat storage part of one part heat storage segment member may differ from the material which comprises the heat storage part of another heat storage segment member. Further, for example, a through hole may be provided in the upper surface and / or the side surface of the wall portion of some of the heat storage segment members, and no through hole may be provided in the wall portion of some of the heat storage segment members.

(Inorganic filler 107)
As described with reference to FIGS. 3 and 5, the inorganic filler 107 can be installed in the gap between the casing 105 of the container 100 and each segment member 110 and / or between the segment members 110.

  The inorganic filler 107 may be, for example, an alumina-silica-based inorganic material (for example, alumina particles or alumina powder).

  Instead of the inorganic filler 107, a sheet material containing inorganic fibers may be used. Since the sheet material containing inorganic fibers is generally low-elasticity and flexible, when such a sheet material is used, the segment member 110 is mechanically bonded to the sheet material by pressing the segment member 110 against the sheet material. Can be adhered to. Further, since the thickness becomes more uniform than when an amorphous inorganic filler such as castable is used, it is possible to reduce the dimensional error from the design container shape. Furthermore, when a segment member is damaged, the segment member can be easily removed by pulling it out of the sheet material. Therefore, in this embodiment, the segment member can be easily replaced as compared with the case where the inorganic filler 107 is used for the gap. In addition, in the state which pressed the segment member 110 with respect to the sheet | seat material, when sufficient adhesiveness is not acquired, you may use an inorganic adhesive material between both.

  The material of the inorganic fiber contained in the sheet material is not particularly limited, and the inorganic fiber may include, for example, alumina, silica, or a mixture thereof. The form of the sheet material is not particularly limited, and the sheet material may be in various forms such as a mat-like form made of inorganic fibers or a non-woven cloth form.

(Case 105)
The housing 105 can be used in various ways. For example, the outer shape of the housing 105 is not limited to a spherical shape as shown in FIG. 3, and the housing may have other outer contours such as a cylindrical shape and a rectangular shape. Further, the housing 105 may have a double wall structure, and an air layer, a decompression layer, or a vacuum layer may be provided between two walls. Or you may provide a heat insulating material layer or a heat | fever reflection layer between two walls. Further, as a material for the housing, nickel base alloy or the like may be used in addition to stainless steel.

  Although the structural example of the container of this embodiment was demonstrated above, according to the container of this embodiment, it is excellent in heat retention and lightweight, and can provide a container with high energy saving property.

EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention in detail, this invention is not limited to the Example which concerns.
[Reference Example 1]
In Reference Example 1, a segment member was produced and evaluated under the following conditions. The segment member produced in this reference example is a segment member for use as a heat dissipation suppression segment member.
(Reference Example 1-1)
Metallic silicon powder (average particle size 1 μm) and silicon nitride powder (average particle size 1 μm) were weighed to a weight ratio of 75:25, and these powders were sufficiently mixed. To this mixed powder, an acrylic binder was added so as to be 1 wt% with respect to the weight of the mixed powder, and further 25 wt% of water was added with respect to the weight of the mixed powder. This mixed liquid was mixed by a ball mill to obtain a slurry.

  The obtained slurry was poured into a plaster mold to produce a molded body. The plaster mold has an upper lid and is shaped so as to obtain a molded body having the shape shown in FIG. Further, the upper lid is provided with a discharge port for discharging unsolidified slurry. A molded body having a hollow interior can be obtained by discharging a part of the unsolidified slurry after the thickness is set to a predetermined thickness. Using this gypsum mold, a molded body having a thickness of about 3 mm and a hollow inside was obtained.

  The obtained molded body was dried and then fired in a nitrogen atmosphere at a maximum of 1500 ° C. to obtain a wall portion of the segment member made of silicon nitride and having the shape shown in FIG.

  Further, in order to reduce the heat transfer area of the segment member, a total of 18 through-holes with a diameter of 10 mm are formed in the same place as in FIGS. 4B and 4C on the side surface 5 of the wall surface of the segment member. One through hole having a diameter of 40 mm was formed at the same position as in FIG.

In the obtained segment member, the length of the long sides (LU4 and LU5 in FIG. 2) of the first main surface is 55 mm, and the length of the short sides (LU1 to LU3 in FIG. 2) is 33 mm. Met. The long side (LD4 and LD5 in FIG. 2) of the second main surface was 40 mm, and the short side (LD1 to LD3 in FIG. 2) was 24 mm. The wall thickness was about 3 mm, and the height (length G / cos θ ₃ in FIG. 2) was 33 mm.

  Subsequently, the material which comprises a heat insulation part was filled into the internal space of the wall part of the obtained segment member. Alumina-silica ceramic fiber was used as the material constituting the heat insulating part.

  Next, a film of aluminum titanate was formed on the bottom surface 112 of the wall portion of the segment member.

A method for forming a film of aluminum titanate will be described. First, an aluminum titanate powder (average particle diameter 1 μm) and 25 wt% of water with respect to the weight of the powder were mixed by a ball mill to obtain a slurry. After the obtained slurry was applied to the bottom surface 112 of the segment member, an aluminum titanate film was formed by firing at a maximum of 1600 ° C. in an air atmosphere. The thickness of the obtained aluminum titanate film was 200 μm.
(Evaluation method)
Next, the evaluation method of the obtained heat dissipation suppression segment member will be described.

  Each segment member was evaluated for heat retention, lightness and durability.

  The heat retention was evaluated by the following procedure.

  A segment member was arranged at the center in the height direction of a vertical cylinder formed of ceramic fibers, and the segment member was thermally shielded from the outside. And the segment member was heated with the electric heater installed in the lower part of the segment member, and the power consumption of the electric heater when the bottom surface 112 of the segment member was maintained at 700 ° C. for 1 hour was measured. Further, the temperature difference between the upper surface 111 and the bottom surface 112 of the segment member when the temperature of the bottom surface 112 was 700 ° C. was measured.

  Next, based on (Equation 4), the amount of passing heat Q passing through the segment member per hour calculated from the measured power consumption, the temperature difference between the measured top surface 111 and the bottom surface 112 of the segment member, and the time t The heat passage rate k of each segment member was calculated by dividing by the product of. Since the passing heat quantity Q passing through the segment member per hour is used, it is calculated as t = 3600 s in Equation 4.

  Then, the heat passage rate k in the following (Reference Example 1-6) was used as a reference, that is, 100, and the heat passage rate k was indexed to be an index of “heat retention”.

  The smaller the index obtained as a result of the evaluation of heat retention, the better. The index of less than 100 was evaluated as ○, and 100 or more was evaluated as ×. In Table 1, the upper row shows the index calculated by the upper row, and the lower row shows the evaluation result.

  The lightness (unit weight) was evaluated by the following procedure.

  For light weight, the mass of the obtained segment member was measured, and the mass of the segment member obtained in the following (Reference Example 1-6) was indexed as a reference, that is, 100, and used as an index of “light weight” .

  The smaller the index obtained as a result of the lightness evaluation, the better. The index of 100 or less was evaluated as ◯, and 101 or more was evaluated as x. In Table 1, the upper row shows the index calculated by the upper row, and the lower row shows the evaluation result.

  The durability (impact resistance) was evaluated by the following procedure.

  Regarding durability, the obtained segment member was subjected to a rapid heating test and a rapid cooling test at 700 ° C. That is, using a gas burner, the temperature was raised from room temperature to 700 ° C. in 5 minutes and rapidly heated. After the temperature was raised, the segment member was rapidly cooled from 700 ° C. to room temperature in 5 minutes using an air compressor.

  The durability was evaluated based on the presence or absence of breakage due to rapid heating and / or rapid cooling. The case where there was no damage was evaluated as ◯, and the case where damage occurred was evaluated as x.

  Moreover, the lowest evaluation was described among heat retention, lightness, and durability as comprehensive evaluation.

The results are shown in Table 1.
(Reference Example 1-2)
A segment member was produced and evaluated in the same manner as in Reference Example 1-1 except that the coating formed on the bottom surface 112 of the wall portion of the segment member was alumina.

  As the alumina coating, first, alumina powder (average particle size 1 μm) and 25 wt% of water based on the weight of the powder were mixed by a ball mill to obtain a slurry. The obtained slurry was applied to the bottom surface 112 of the wall portion of the segment member and then fired at a maximum of 1600 ° C. in an air atmosphere to form an alumina film. The thickness of the obtained alumina coating was 150 μm.

The evaluation results are shown in Table 1.
(Reference Example 1-3)
A segment member was prepared and evaluated in the same manner as in Reference Example 1-1 except that the film formed on the bottom surface 112 of the wall portion of the segment member was an aluminum film.

  For the aluminum coating, first, an aluminum powder (average particle size 1 μm) and 25 wt% of water with respect to the weight of the powder were mixed by a ball mill to obtain a slurry. After the obtained slurry was applied to the bottom surface 112 of the wall portion of the segment member, an aluminum film was formed by baking at a maximum of 700 ° C. in an air atmosphere. The thickness of the obtained aluminum film was 100 μm.

The evaluation results are shown in Table 1.
(Reference Example 1-4)
An acrylic binder is added to aluminum titanate powder (average particle size 1 μm) so as to be 1 wt% relative to the weight of the aluminum titanate powder, and 25 wt% water is added relative to the weight of the aluminum titanate powder. It was. This mixed liquid was mixed by a ball mill to obtain a slurry.

  The obtained slurry was poured into a plaster mold to produce a molded body. The plaster mold has an upper lid and is shaped so as to obtain a molded body having the shape shown in FIG. Further, the upper lid is provided with a discharge port for discharging unsolidified slurry. A molded body having a hollow interior can be obtained by discharging a part of the unsolidified slurry after the thickness is set to a predetermined thickness. Using this gypsum mold, a molded body having a thickness of about 3 mm and a hollow inside was obtained.

  The obtained molded body was dried and then fired at a maximum of 1600 ° C. in an air atmosphere to obtain a wall portion of a segment member made of aluminum titanate and having the shape shown in FIG.

  Further, in order to reduce the heat transfer area of the segment member, a total of 18 through-holes with a diameter of 10 mm are formed in the same place as in FIGS. 4B and 4C on the side surface 5 of the wall surface of the segment member. One through hole having a diameter of 40 mm was formed at the same position as in FIG.

In the obtained segment member, the length of the long sides (LU4 and LU5 in FIG. 2) of the first main surface is 55 mm, and the length of the short sides (LU1 to LU3 in FIG. 2) is 33 mm. Met. The long side (LD4 and LD5 in FIG. 2) of the second main surface was 40 mm, and the short side (LD1 to LD3 in FIG. 2) was 24 mm. The wall thickness was about 3 mm, and the height (length G / cos θ ₃ in FIG. 2) was 33 mm.

  Subsequently, the material which comprises a heat insulation part was filled into the internal space of the wall part of the obtained segment member. Alumina-silica ceramic fiber was used as the material constituting the heat insulating part.

The segment member obtained by the above procedure was evaluated in the same manner as in Reference Example 1-1. The results are shown in Table 1.
(Reference Example 1-5)
To the alumina powder (average particle size 1 μm), an acrylic binder was added so as to be 1 wt% with respect to the weight of the alumina powder, and further 25 wt% water was added with respect to the weight of the alumina powder. This mixed liquid was mixed by a ball mill to obtain a slurry.

  The obtained slurry was poured into a plaster mold to produce a molded body. The plaster mold has an upper lid and is shaped so as to obtain a molded body having the shape shown in FIG. Further, the upper lid is provided with a discharge port for discharging unsolidified slurry. A molded body having a hollow interior can be obtained by discharging a part of the unsolidified slurry after the thickness is set to a predetermined thickness. Using this gypsum mold, a molded body having a thickness of about 3 mm and a hollow inside was obtained.

  The obtained molded body was dried and then fired at a maximum of 1600 ° C. in an air atmosphere, whereby a wall portion of the segment member made of alumina and having the shape shown in FIG. 2 was obtained.

  Further, in order to reduce the heat transfer area of the segment member, a total of 18 through-holes with a diameter of 10 mm are formed in the same place as in FIGS. 4B and 4C on the side surface 5 of the wall surface of the segment member. One through hole having a diameter of 40 mm was formed at the same position as in FIG.

In the obtained segment member, the length of the long sides (LU4 and LU5 in FIG. 2) of the first main surface is 55 mm, and the length of the short sides (LU1 to LU3 in FIG. 2) is 33 mm. Met. The long side (LD4 and LD5 in FIG. 2) of the second main surface was 40 mm, and the short side (LD1 to LD3 in FIG. 2) was 24 mm. The wall thickness was about 3 mm, and the height (length G / cos θ ₃ in FIG. 2) was 33 mm.

  Subsequently, the material which comprises a heat insulation part was filled into the internal space of the wall part of the obtained segment member. Alumina-silica ceramic fiber was used as the material constituting the heat insulating part.

The segment member obtained by the above procedure was evaluated in the same manner as in Reference Example 1-1. The results are shown in Table 1.
(Reference Example 1-6)
Metallic silicon powder (average particle size 1 μm) and silicon nitride powder (average particle size 1 μm) were weighed to a weight ratio of 75:25, and these powders were sufficiently mixed. To this mixed powder, an acrylic binder was added so as to be 1 wt% with respect to the weight of the mixed powder, and further 25 wt% of water was added with respect to the weight of the mixed powder. This mixed liquid was mixed by a ball mill to obtain a slurry.

  The obtained slurry was poured into a plaster mold to produce a molded body. The plaster mold has an upper lid and is shaped so as to obtain a molded body having the shape shown in FIG. Further, the upper lid is provided with a discharge port for discharging unsolidified slurry. A molded body having a hollow interior can be obtained by discharging a part of the unsolidified slurry after the thickness is set to a predetermined thickness. Using this gypsum mold, a molded body having a thickness of about 3 mm and a hollow inside was obtained.

  The obtained molded body was dried and then fired in a nitrogen atmosphere at a maximum of 1500 ° C. to obtain a wall portion of the segment member made of silicon nitride and having the shape shown in FIG.

  Further, in order to reduce the heat transfer area of the segment member, a total of 18 through-holes with a diameter of 10 mm are formed at the locations of FIGS. One through hole having a diameter of 40 mm was formed at the position 4 (a).

In the obtained segment member, the length of the long sides (LU4 and LU5 in FIG. 2) of the first main surface is 55 mm, and the length of the short sides (LU1 to LU3 in FIG. 2) is 33 mm. Met. The long side (LD4 and LD5 in FIG. 2) of the second main surface was 40 mm, and the short side (LD1 to LD3 in FIG. 2) was 24 mm. The wall thickness was about 3 mm, and the height (length G / cos θ ₃ in FIG. 2) was 33 mm.

  Subsequently, the material which comprises a heat insulation part was filled into the internal space of the wall part of the obtained segment member. The heat insulating part was formed by filling an alumina siliceous ceramic fiber as a material constituting the heat insulating part.

  The segment member obtained by the above procedure was evaluated in the same manner as in Reference Example 1-1. The results are shown in Table 1.

  From the results shown in Table 1, the overall evaluation of Reference Example 1-1 to Reference Example 1-5 is ◯, and it is preferably used as a heat dissipation suppression segment member having a function of suppressing heat dissipation from an object in the container. I was able to confirm that On the other hand, in the segment member of Reference Example 1-6, the heat retention evaluation was x, and the overall evaluation was x. Since the segment member of Reference Example 1-6 has no film formed on the bottom 112, the bottom 112 is formed of silicon nitride. The total reflectance of silicon nitride at 700 ° C. is 20% or less. For this reason, as above-mentioned, it is thought that evaluation of heat retention became x. From the above evaluation results, when a container was formed using the segment member of Reference Example 1-6, it was confirmed that heat dissipation from an object accommodated in the container could not be sufficiently suppressed. That is, it was confirmed that the segment member of Reference Example 1-6 does not function as a heat dissipation suppression segment member.

In addition, when the total reflectance in 700 degreeC was measured according to JISR1693-2 about the bottom part 112 of the segment member of Reference Example 1-1 to Reference Example 1-6, Reference Example 1-1 to Reference Example 1-5 The total reflectance at 700 ° C. of the bottom portion 112 of each segment member was 35 to 50%, and it was confirmed that it was 30% or more. For example, it was 47% in Reference Example 1-4. On the other hand, it was confirmed that it was 12% in Reference Example 1-6 and less than 30%.
[Reference Example 2]
In Reference Example 2, a segment member was produced and evaluated under the following conditions. The segment member produced in this reference example is a segment member for use as a heat storage segment member.
(Reference Example 2-1)
Metallic silicon powder (average particle size 1 μm) and silicon nitride powder (average particle size 1 μm) were weighed to a weight ratio of 75:25, and these powders were sufficiently mixed. To this mixed powder, an acrylic binder was added so as to be 1 wt% with respect to the weight of the mixed powder, and further 25 wt% of water was added with respect to the weight of the mixed powder. This mixed liquid was mixed by a ball mill to obtain a slurry.

  The obtained slurry was poured into a plaster mold to produce a molded body. The plaster mold has an upper lid and is shaped so as to obtain a molded body having the shape shown in FIG. Further, the upper lid is provided with a discharge port for discharging unsolidified slurry. A molded body having a hollow interior can be obtained by discharging a part of the unsolidified slurry after the thickness is set to a predetermined thickness. Using this gypsum mold, a molded body having a thickness of about 3 mm and a hollow inside was obtained.

  The obtained molded body was dried and then fired in a nitrogen atmosphere at a maximum of 1500 ° C. to obtain a wall portion of the segment member made of silicon nitride and having the shape shown in FIG.

  Further, in order to reduce the heat transfer area of the segment member, a total of 18 through-holes with a diameter of 10 mm are formed in the same place as in FIGS. 4B and 4C on the side surface 5 of the wall surface of the segment member. One through hole having a diameter of 40 mm was formed at the same position as in FIG.

In the obtained segment member, the length of the long sides (LU4 and LU5 in FIG. 2) of the first main surface is 55 mm, and the length of the short sides (LU1 to LU3 in FIG. 2) is 33 mm. Met. The long side (LD4 and LD5 in FIG. 2) of the second main surface was 40 mm, and the short side (LD1 to LD3 in FIG. 2) was 24 mm. The wall thickness was about 3 mm, and the height (length G / cos θ ₃ in FIG. 2) was 33 mm.

  Subsequently, the material which comprises a thermal storage part was filled into the internal space of the wall part of the obtained segment member. The material constituting the heat storage part was filled by kneading silicon carbide castable with water to produce a slurry, and pouring the slurry into the inner surface side of the internal space of the wall part of the formed segment member. After filling the material constituting the heat storage part, it was dried at 700 ° C. In addition, the material which comprises a thermal storage part was filled so that 50% of the inner surface side by volume ratio might be occupied in the internal space of the wall part of a segment member.

  Next, the remaining part of the internal space of the wall part of the obtained segment member was filled with a material constituting the heat insulating part. Alumina-silica ceramic fiber was used as the material constituting the heat insulating part.

  The obtained segment members were evaluated for heat retention, light weight and durability. The heat retention and lightness were evaluated in the same manner as in Reference Example 1-1. Durability is evaluated by applying a load of 3.5 kPa, assuming a molten aluminum to be poured into the container with respect to the entire bottom surface 112 that will constitute the inner surface of the container among the obtained segment members. Went.

  The durability (load resistance) was evaluated for the presence or absence of breakage due to the load. The case where there was no damage was evaluated as ◯, and the case where damage occurred was evaluated as x.

  Moreover, the lowest evaluation was described among heat retention, lightness, and durability as comprehensive evaluation.

The results are shown in Table 2.
(Reference Example 2-2)
A segment member was prepared and evaluated in the same manner as in Reference Example 2-1, except that the heat insulating portion was not formed. The results are shown in Table 2.
(Reference Example 2-3)
After forming the wall part of the segment member, before forming the heat storage part and the heat insulating part, the segment member was prepared in the same manner as in Reference Example 2-1, except that the through hole was not formed in the wall part of the segment member. ,evaluated.

  In addition, when forming a heat storage part and a heat insulation part, the opening part for inject | pouring slurry was formed in the upper surface of a segment member, and the heat storage part and the heat insulation part were formed.

The results are shown in Table 2.
(Reference Example 2-4)
A segment member was produced and evaluated in the same manner as in Reference Example 2-1, except that the heat storage part and the heat insulation part were not formed. The results are shown in Table 2.

According to the results shown in Table 2, it was confirmed that the comprehensive evaluation of the reference example 2-1 to reference example 2-3 in which the heat storage part was formed in the internal space of the wall part was ◯. On the other hand, about the reference example 2-4 which did not form the thermal storage part, heat retention evaluation was x, and it was confirmed that comprehensive evaluation becomes x. In this case, since Reference Example 2-4 did not have a heat storage function, it was confirmed that it did not have a function as a heat storage segment member.
[Example]
A substantially spherical container 100 shown in FIG. The outer side (case 105) of the container 100 was made of stainless steel having a thickness of 4 mm. Note that the housing 105 is divided. The dimensions of the assembled stainless steel housing are an outer diameter of 258 mm and an inner diameter of 250 mm.

  An inorganic fiber sheet mainly composed of alumina and silica is disposed on the inner surface of the casing 105, and each segment member 110 produced in Reference Examples 1 and 2 is further formed on the inner surface of the sheet. The inner surface 130 of the container was formed by arranging and arranging in the form shown in FIG. 3 according to the conditions shown in Comparative Examples 1 and 2. In addition, the inorganic fiber sheet having a thickness of about 1 mm was also installed in a gap formed between the segment members.

  When the inner surface 130 of the container 100 configured as described above is assumed to be a sphere, the radius of the sphere is about 90 mm. In this container, about 7 kg of molten aluminum can be accommodated.

About each Example and the comparative example, the container (sample) produced according to the conditions shown below was evaluated.
Example 1
Of the inner surface 130, the portion above the liquid level of the molten aluminum in the container 100 indicated by the dotted line A in the figure and the inner surface portion of the upper lid 150 are heat dissipation suppression segment members having a function of suppressing heat dissipation. The segment member obtained in Reference Example 1-4) was used.

On the other hand, the part below the liquid level of the molten aluminum shown by the dotted line A in the figure in the inner surface 130 is composed of the segment member obtained in (Reference Example 2-1) which is a heat storage segment member having a heat storage function. did.
( Reference Example A )
Of the inner surface 130, the portion above the liquid level of the molten aluminum in the container 100 and the inner surface portion of the upper lid 150 indicated by the dotted line A in the figure is a heat radiation suppressing segment member having a function of suppressing heat radiation (reference). The segment member obtained in Example 1-1) was used.

On the other hand, the part below the liquid level of the molten aluminum shown by the dotted line A in the figure in the inner surface 130 is composed of the segment member obtained in (Reference Example 2-1) which is a heat storage segment member having a heat storage function. did.
(Comparative Example 1)
All of the inner surface 130 was composed of the segment member obtained in (Reference Example 1-6).
(Comparative Example 2)
All of the inner surface 130 was configured with the segment member obtained in (Reference Example 2-1) as a heat storage segment member having a heat storage function.

  Next, the evaluation method of the sample produced by each Example and the comparative example is demonstrated.

The obtained container was evaluated for heat retention, lightness and durability. The results are shown in Table 3.

  Evaluation of heat retention (temperature of the object) was performed by injecting about 7 kg of molten aluminum having an initial temperature of about 750 ° C. into the container and measuring the temperature of the molten metal after 1 hour from the sealing time. When the temperature of the molten metal after 1 hour passed was 700 ° C or higher, it was evaluated as x, and when it was lower than 700 ° C, it was evaluated as x. The upper row of Table 3 shows the temperature of the molten metal after 1 hour, and the lower row shows the evaluation results.

As a result of the heat retention evaluation, it was confirmed that in the containers of Comparative Examples 1 and 2, the temperature of the molten aluminum decreased to less than 700 ° C. after 1 hour. On the other hand, in the case where the inner surface is constituted by the segment member according to Example 1 and Reference Example A , the temperature of the molten aluminum after 1 hour is 700 ° C. or more, specifically 710 ° C. 705 ° C. From this, a part of the inner surface of the container has a function of suppressing heat dissipation from the object in the container, and at least a part of the remaining part of the inner surface of the container has a heat storage function, thereby improving the heat retention of the container. We were able to confirm that it could be increased.

  Next, the lightness (member weight) of the container was evaluated. Based on the mass of the sample (container) of Comparative Example 2 as a reference, that is, 100, an index of the mass of the sample of each Example and Comparative Example was calculated. A container of less than 100 was evaluated as ◯, and when it was 100 or more, it was evaluated as ×. The index calculated in the upper part of the column of light weight in Table 3 shows the evaluation results in the lower part.

As a result of the lightness evaluation, a part of the inner surface of the container is a heat dissipation suppression segment member having a function of suppressing heat dissipation from an object in the container, and the remaining part of the inner surface of the container is a heat storage segment member having a heat storage function. In Example 1, Reference Example A , and Comparative Example 1, the index was less than 100, and the evaluation was “good”. On the other hand, about the comparative example 2 which comprised the inner surface of the container only with the heat storage segment member, the parameter | index became 100, and it has confirmed that there was a problem in the lightness of a container.

  Next, the durability (breakage resistance) of the container was evaluated.

  The durability was evaluated by examining whether or not the segment member was damaged after the container was transported by a lift in a state where about 7 kg of molten aluminum having an initial temperature of about 750 ° C. was poured into the container. When there was no damage, it was evaluated as ◯, and when there was damage, it was evaluated as x.

  As a result of the durability evaluation, it was confirmed that no damage occurred in any of the containers.

  Moreover, about comprehensive evaluation, the lowest evaluation among heat retention, lightness, and durability was made into comprehensive evaluation.

As a result, the comprehensive evaluation of Example 1 and Reference Example A was “good”, and the comprehensive evaluation of Comparative Examples 1 and 2 was “poor”. From this, it was confirmed that the containers of Example 1 and Reference Example A were excellent in heat retention and light weight and excellent in durability.

100 Container 110 Segment member 130 Inner surface 135 Internal chamber 1101 Wall

Claims (8)

A container capable of accommodating an object in an internal chamber formed by an inner surface;
The inner surface is composed of two or more types of segment members having different functions,
At least a part of the inner surface is composed of a heat dissipation suppression segment member having a function of suppressing heat dissipation from the object,
Furthermore, at least a part of the remaining part of the inner surface is composed of a heat storage segment member having a heat storage function,
At least a part of the non-contact portion with the object on the inner surface is composed of the heat dissipation suppression segment member,
Furthermore, at least a part of the contact portion with the object on the inner surface is composed of the heat storage segment member,
The heat dissipation suppression segment member and the heat storage segment member have a wall portion having a hollow structure,
The wall portion of the heat dissipation suppressing segment member is made of aluminum titanate,
The wall portion of the heat storage segment member is made of silicon nitride;
The surface constituting the inner surface of the heat radiation suppressing segment member is a product of the radiant intensity of the black body at each wavelength λ μm at 700 ° C. and the reflectance at the wavelength λ, measured according to JIS R 1693-2. The total reflectance at 700 ° C. obtained by dividing the value integrated in the range of 1 to 25 μm by the value obtained by dividing the radiation intensity of the black body at each wavelength λ of 700 ° C. within the range of wavelength λ = 1 to 25 μm. Is 30% or more, or
The container by which the film which the total reflectance in the said 700 degreeC is 30% or more is formed in the surface which comprises the said inner surface of the said heat radiation suppression segment member . The heat dissipation suppression segment member is
Wherein the heat insulating portions thermal conductivity is lower than the wall portion, the container according to claim 1 having the inside space of the wall portion of the heat radiation reduction segmented members. The container according to claim 1 or 2 , wherein a heat storage section having a specific heat larger than air is disposed on the inner surface side of the internal space of the wall section of the heat storage segment member. The container according to claim 3 , wherein the heat storage unit includes one or more materials selected from silicon carbide, boron carbide, alumina, and aluminum. The container according to claim 3 or 4 , wherein the heat storage segment member has a heat insulating part having a lower thermal conductivity than the wall part in the remaining part of the internal space of the wall part. The container according to any one of claims 1 to 5, wherein the coating includes one or more materials selected from aluminum titanate, alumina, spinel, zirconia, and aluminum. A container according to any one of the object claims 1 to 6 is a molten metal. The container according to claim 7 , wherein the metal contained in the molten metal is aluminum or an aluminum alloy.

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