JPH079231U - Insulation container - Google Patents

Abstract

(57) [Summary] [Structure] A container body 1 and a lid body 2 in which heat insulating materials 5 and 7 made of foamed resin are respectively used as core materials are provided, and the bottom wall portion of the container body 1 has a positive temperature coefficient thermistor. A heat generating device 10 including a heat generating member 11 including a heat generating element, a heat radiating plate 12 that transmits heat generated from the heat generating member 11 into the heat retaining housing 1a, and heats and heats the heat retaining housing 1a of the container body 1.
Is buried. [Effect] With this, it is possible to maintain the heat retention temperature of the object to be kept at an arbitrary temperature based on the user setting, and as a result, it is possible to provide a heat retention container having excellent heat retention performance. Specifically, even when the cooked rice is transported for a long time, the temperature inside the heat insulation accommodating portion 1a can be reliably maintained at 60 ° C. or higher, so that the cooked rice can always be transported in a delicious state.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a heat insulating container in which a heating element such as a barium titanate-based porcelain semiconductor having PTC (Positive Temperature Coefficient) characteristics is embedded in the container body.

[0002]

[Prior art]

 Conventionally, a heat insulating container for accommodating and transporting a heat-insulating material such as cooked rice generally uses a foamed polystyrene foam or the like as disclosed in JP-B-59-11098 and JP-B-59-11099. By providing a container main body that uses a heat insulating material made of resin as a core material and a lid, and by closing the inside of the heat-retaining storage portion of the container main body containing the heat-retained object with the lid in a sealed state, Keeping warm.

For example, when freshly cooked cooked rice (90 ° C.) is placed in an ordinary container, as shown in the curve of FIG. Becomes unpleasant. On the other hand, in the above-mentioned heat insulation container, by sealing the cooked rice in the accommodating section with a heat insulating material, as shown by the curve in Fig. 7, the time during which the cooked rice becomes 40 ° C or lower is extended and the cooked rice is kept cool during transportation. To prevent.

The above-mentioned heat-insulating container for transporting heat-insulated objects such as cooked rice is widely used in places such as lunch centers, sushi chains, and hospitals where a large amount of cooked rice is required.

[0005]

[Problems to be solved by the device]

 However, even the heat insulating container provided with the above-described conventional heat insulating material does not have sufficient heat insulating performance. For example, when the container body has a rectangular shape, which is a general shape, the four corners in the heat-retaining compartment are heavily cooled, so that even if a heat-insulating material is contained, temperature unevenness occurs in the heat-retaining compartment. In addition, when keeping the above-mentioned cooked rice warm, by extending the time during which the temperature of the cooked rice falls below 40 ° C, it can be avoided that the cooked rice becomes cold and unpleasant, but in fact, it can be eaten deliciously. It is not possible to maintain temperatures above 60 ° C, which is possible. It should be noted that it is optimal to maintain the above-mentioned 60 ° C. as the temperature for keeping the cooked rice in hygiene.

[0006] Therefore, when transporting a heat-retaining object such as cooked rice, it may be possible to keep the heat-retaining container warm with a heater in consideration of the heat-retaining property of the heat-retaining object. Various devices such as control and overcurrent prevention are required. For this reason, there is a problem that the size of the device becomes large and the cost including transportation is increased.

[0007]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the heat insulating container of the present invention comprises a container body and a lid body in which a heat insulating material made of foamed resin is used as a core material, and is placed in a heat insulating container portion of the container body in which the object to be heated is stored. The following measures are taken in a heat-retaining container that keeps the object to be heat-retained by closing the container with a lid.

That is, in the container body, a heat generating member provided with a heat generating element composed of a positive temperature coefficient thermistor, and a heat radiating plate for transmitting heat generated from the heat generating member to the heat retaining housing are embedded.

[0009]

[Action]

 According to the above configuration, when the object to be heat-retained is kept warm by using the heat-retaining container, the object to be kept warm is housed in the heat-retaining container of the container body, and the inside of the heat-retaining container is closed by the lid. Then, heat is generated from the heat-generating member in the above-described state of containing the object to be kept warm, and the generated heat is transmitted to the inside of the warm-keeping containing portion via the heat dissipation plate. As a result, the heat-retaining object housed in the heat-retaining container is heated and kept warm, and the heat-retaining property of the heat-retaining object is improved.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 1, the heat insulation container according to the present embodiment has a rectangular parallelepiped shape with an upper surface opened and a heat insulation container 1 a for accommodating an object to be heated such as rice. It is composed of a main body 1 and a rectangular flat plate-like lid body 2 that covers an upper surface opening of the container main body 1 and closes the inside of the heat insulation accommodating portion 1a in a sealed state.

The container body 1 includes an inner body 3 and an outer body 4 each made of a molded product of a synthetic resin such as polypropylene, a polystyrene foam, a styrene-maleic anhydride copolymer foam, or a foam such as polypropylene foam. The heat insulating material 5 made of resin is provided, and the members 3 and 4 having the heat insulating material 5 as a core material are joined and fixed to each other.

Further, as a concrete joining and fixing structure of the inner body 3 and the outer body 4, as shown in FIG. 2, the fitting groove 3 a formed at the end portion of the inner body 3 and the outer body 4 are The fitting projections 4a formed at the ends are fitted together, and in this fitting state, the projections 3b formed continuously on the outer edges of the ends of the inner body 3 and the outer body 4 are formed. By welding a thermoplastic resin 6 between 4b, the heat insulating material 5 is sealed and fixed to each other.

A holding portion 1b for carrying the container is formed on each side wall located at both ends in the longitudinal direction of the container body 1.

On the other hand, the lid 2 is formed by covering the heat insulating material 7 made of foamed resin such as urethane foam all around the exterior body 8 made of a molded product of synthetic resin, and on the lower surface side thereof. The fitting protrusion 2a is formed in a continuous shape along the opening of the upper surface of the container body 1 to enable the heat retaining unit 1a to be sealed. It should be noted that notches 2b are formed at each side end located at both ends in the longitudinal direction of the lid body 2 to facilitate removal of the lid body 2 from the container body 1.

Further, as shown in FIG. 3, in the container body 1 of the present embodiment, the heat generating device 10 is embedded in the heat insulating material 5 of the bottom wall portion, and the heat-insulated housing portion 1a accommodates the heat insulation. It is designed to heat and keep things warm. As shown in FIG. 4, this heat generating device 10 supplies power to a total of four heat generating members 11, ..., Four heat radiating plates 12 corresponding to each heat generating member 11 ,. A power supply cord 13 and a junction 14 for connecting the respective heat generating members 11 ... In parallel to the power supply cord 13 are provided, and the heat radiating plates 12 ... Are arranged at the four corners of the bottom wall of the container body 1, respectively. The junction 14 is arranged in the center of the bottom wall of the container body 1, and the heat generating members 11 are individually attached to the heat radiating plates 12.

As shown in FIGS. 5 and 6, the heat generating member 11 includes a heat generating body 15, a pair of upper and lower metal terminals 16 and 16, two lead wires 17 and 17 which are power supply lines, and an electrical insulation. And an insulating case 18 made of a conductive material.

The heating element 15 is made of a material having a positive temperature coefficient (PTC) characteristic, for example, a ceramic semiconductor mainly made of barium titanate or the like, and has a low temperature from room temperature to the Curie temperature (rapid change temperature). Although it is a resistance, it is a positive temperature coefficient thermistor as a heat sensitive element having a characteristic that the resistance value sharply increases when the Curie temperature is exceeded.

Due to this characteristic, when a voltage is applied, the heating element 15 initially has a low resistance value because of the low temperature and a large current flows. As a result, the temperature rapidly rises while the temperature rises. When the temperature exceeds the Curie temperature, the resistance value sharply increases, so that the temperature does not rise above a certain temperature and the certain temperature is kept stable. That is, the heating element 15 can have a self-temperature control function. Therefore, the heat generating member 11 consumes less power, can omit the temperature control circuit and the heating prevention circuit, and can be downsized. Further, there is no fear of ignition due to local heating.

Further, the heating element 15 has a donut shape having a through hole in the central portion thereof, and as shown in FIG. 6, an electrode 15 a. 15a.

The metal terminal 16 is in the form of a flat plate having a diameter substantially equal to the outer diameter of the heating element 15. In addition, each metal terminal 16, 16 is formed with a power feeding portion 16a, 16a for connecting the lead wires 17, 17 and these power feeding portions 16a, 16a are arranged in parallel with each other. It extends in the direction of introduction of the corresponding lead wire 17.

The electrical connection between the heating element 15 and the metal terminal 16 is made by attaching the electrode 15a of the heating element 15 and the metal terminal 16 with, for example, an epoxy-silver mixed conductive adhesive. ing. Further, the electric connection between the power feeding portion 16a and the lead wire 17 is made by soldering the corresponding lead wire 17 to the facing surface side of the power feeding portion 16a.

The insulating case 18 is composed of an insulating case lower portion 18a, which is a covering substrate, and an insulating case upper portion 18b. The insulating case 18 covers the heating element 15 and the metal terminal 16 to hermetically seal them. In addition, the insulating case 18 also includes the end portion of the lead wire 17 on the metal terminal 16 side so that the soldering portion of the lead wire 17 and the power supply portion 16a of the metal terminal 16 is not subjected to a mechanical load and is not disconnected. It is supposed to cover.

In the insulating case 18, the heating element 15 and the like are housed in the insulating case lower portion 18a which is preformed by injection molding or the like, and the insulating case upper portion is installed in the injection molding die (not shown). The insulating case lower portion 18a and the insulating case upper portion 18b are integrally formed by injection molding an electrically insulating material to be 18b. As a result, the heating element 15 and the like are sealed and fixed inside the insulating case 18.

Further, the insulating case 18 has a small heat shrinkage ratio, is excellent in thermal conductivity and mechanical strength, and has heat resistance capable of withstanding the heat generation temperature of the heat generating element 15, and close contact with the coating material of the lead wire 17. It must have good properties, and is formed of, for example, a polymer alloy made of nylon, polypropylene and glass. Further, the insulating case 18 has a waterproof property in which moisture such as water vapor does not pass inside and an airtight property in which air does not pass inside.

On the other hand, the heat dissipation plate 12 is composed of an aluminum plate having a thickness of 2 mm and having excellent thermal conductivity. The thickness and material of the heat dissipation plate 12 are not particularly limited, and it is possible to use copper, phosphor bronze, SUS, or another metal having excellent thermal conductivity, or a flame-retardant resin. . When a flame-retardant resin is used as the heat dissipation plate 12, for example, vinyl chloride resin is used at a heat generation temperature of 60 ° C. or lower, and a silicon-based chemical tube is used at a heat generation temperature of 100 ° C. or lower, and further, A heat-resistant silicone resin is most suitable for heat generation temperatures of 100 ° C or higher.

In the above-mentioned configuration, when the object to be kept warm is to be kept warm by using the present heat-retaining container, the object to be kept warm is stored in the heat-retaining container 1a of the container body 1 and the inside of the heat-retaining container 1a is covered with the lid 2 Closes in a sealed state. Then, power is supplied to the heat-generating member 11 from the power cord 13 constituting the heat-generating device 10 in the state where the heat-retaining object is accommodated as described above. As a result, heat is generated from the heat-generating member 11, and this heat is transmitted to the inside of the heat-retaining housing 1a via the heat dissipation plate 12, so that the heat-retained object housed in the heat-retaining housing 1a is heated and kept warm. To be done.

As described above, the heat insulating container of the present embodiment includes the container body 1 and the lid body 2 in which the heat insulating materials 5 and 7 made of foamed resin are used as core materials, respectively, and In the bottom wall portion, a heat generating device 10, which is composed of a heat generating member 11, a heat radiating plate 12, a power cord 13, and a junction 14 and which heats and heats the inside of the heat retaining housing portion 1a of the container body 1, is embedded.

Therefore, the heat retention temperature of the object to be heat-retained can be maintained at an arbitrary temperature based on the user setting, and as a result, it is possible to provide the heat retention container having excellent heat retention performance. Specifically, even when the cooked rice is transported for a long time, the temperature in the heat insulation accommodating portion 1a can be reliably maintained at 60 ° C. or higher, so that the cooked rice can be always transported in a delicious state.

By the way, since the heat radiating plates 12 constituting the heat generating device 10 of the present embodiment are arranged at the four corners of the heat retaining container 1a where the temperature cooling is relatively intense, the heat retaining chamber 1a is evenly distributed. It is possible to keep warm by heating. Further, since the container body 1 for containing the heat-retaining object is formed by joining and fixing the inner body 3 and the outer body 4, the container body 1 can be used even when performing sanitary treatment such as washing with water and hot water detoxification. There is no risk that water or the like will leak into the heat insulating material 5 which is the core material of the main body 1, and further into the heat generating device 10, and as a result, it is possible to reliably prevent deterioration of the heat retention performance due to repeated use. However, since the heat-generating member 11 that is the heat-generating source of the heat-generating device 10 is formed so as to be entirely covered with the insulating case 18, even if water or the like leaks into the heat insulating material 5, the heat-generating member 11 is accompanied by an electric leakage. The heat generating device 10 does not break down.

The above embodiment is not intended to limit the present invention, and various modifications can be made within the scope of the present invention. For example, in the above-described embodiment, as a structure in which the heat insulating material 5 is hermetically interposed between the inner body 3 and the outer body 4, a structure in which the respective members 3 and 4 are joined and fixed by the thermoplastic resin 6 is adopted. However, the structure is not particularly limited to this, and any structure may be used as long as the heat insulating material 5 is securely sealed and interposed.

[0032]

[Effect of device]

 As described above, in the heat insulating container of the present invention, the heat generating member having the heat generating member including the positive temperature coefficient thermistor and the heat radiating plate for transmitting the heat generated from the heat generating member to the heat insulating accommodating portion are embedded in the container body. It is a configured structure.

This makes it possible to maintain the heat retention temperature of the object to be heat-retained at an arbitrary temperature based on the user setting, and as a result, it is possible to provide a heat retention container having excellent heat retention performance. Specifically, even when the cooked rice is transported for a long time, the temperature in the heat-retaining and accommodating section can be maintained at 60 ° C or higher, and the cooked rice can be transported in a delicious state at all times. Also, since the heat-generating member that constitutes this heat-insulating container is a small type embedded in the body of the container, various devices such as temperature control and overcurrent prevention that keep the heat-insulating container warm with a heater are not required. In addition, it has an effect of reducing the cost including transportation.

[Brief description of drawings]

FIG. 1 is a sectional perspective view showing a heat retaining container according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view taken along the line AA of FIG. 1 showing a joint fixing structure of an inner body and an outer body of a container body that constitutes the above-mentioned heat retaining container.

FIG. 3 is a vertical sectional view showing a heat generating device embedded in the container body.

FIG. 4 is a rear view showing the heat generating device.

FIG. 5 is a plan view showing a heat generating member constituting the heat generating device.

FIG. 6 is a vertical cross-sectional view showing the heat generating member.

FIG. 7 is a graph showing heat retention performance characteristics of a heat retention container in a conventional example.

[Explanation of symbols]

 1 Container Main Body 1a Insulation Retaining Section 2 Lid 5.7 Heat Insulation Material 11 Exothermic Member 12 Radiator Plate

Claims (1)

[Scope of utility model registration request] 1. A container body in which a heat insulating material made of foamed resin is used as a core material and a lid body, and the inside of the heat retaining compartment of the container body containing the object to be heat-sealed is hermetically closed by the lid body. Thus, in the heat retaining container for retaining the heat of the object to be warmed, the container body is embedded with a heat generating member including a heat generating member made of a positive temperature coefficient thermistor, and a heat radiating plate for transmitting heat generated from the heat generating member into the heat retaining container. Insulated container that is characterized by being.