JPH06135488A - Container made of foamed material with internal bag - Google Patents

Abstract

PURPOSE:To maintain heat insulating functions wherein loaded liquid is not contaminated and even if the quantity of the liquid decreases, temperature control is stabilized by providing a plate-shaped heater between the internal surface of foamed material of the bottom of a main body and an internal bag. CONSTITUTION:A container main body 1 is formed from an foamed material having thickness such as polystyrene foam and constituted by a side plate 2, bottom plate 3 with legs 5, and top plate 4. An inner bag 6 made of plastic sheet is accommodated in the body 1 to receive liquid to be loaded. And a heating device 7 is provided on the bottom plate 3 of the body 1 to heat and thermally insulate the loaded liquid in the bag 6. As a result, proper circulation is generated in the loaded liquid so as to maintain the temperature thereof at nearly uniform temperature. And since the body 1 is made from foamed material, it has good heat insulating property, thereby reducing power consumption of heater, and the heater is fixed, thereby making replacement of liquid possible without causing any troubles.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foam container having an inner bag, and particularly to a container suitable for containing a special filling liquid such as a liquid chemical which needs to be kept in a certain temperature range in the inner bag. And a foam container for storage.

[0002]

2. Description of the Related Art Generally, as a means for transporting or storing a special liquid such as trimethylolpropane (freezing point 59 ° C.), a heater is installed in a tank truck of 2 to 3 tons and a heat insulating coating is provided around the tank. A dedicated vehicle is used which can be constantly heated to a temperature above the freezing point with a heater during application, transportation or storage. When this dedicated vehicle is used, the delivery destination also needs a tank having a heating means and a heat retaining function. Further, when transporting or storing the above-mentioned filling liquid using the inner bag as in the present invention, there is also a method in which an electric heating type pipe heater is put in from the inner bag mouth plug portion to heat and keep the filling liquid warm. Are known.

[0003]

However, the above-mentioned dedicated vehicle is very expensive, the equipment cost is high, and when the handling amount decreases, the operating rate decreases and the fixed cost burden increases significantly. In addition, since a special tank is required at the delivery destination, there is a problem that the facility load is further increased.

On the other hand, in the method of inserting the electrothermal heater into the inner bag, a large-diameter plug portion for inserting the pipe heater is required in the inner bag, which easily contaminates the filling liquid and prevents it. In order to maintain the cleanliness of the heater, it is troublesome, the heater must be inserted and taken out each time the liquid is filled and discharged, and when the remaining amount of the liquid is low There is a problem that the heater is exposed and the temperature is not stable.

The present invention solves the problems of such a dedicated vehicle or pipe heater, and is excellent in heat insulation and heat retention functions despite the fact that the cost is very low, and the amount of liquid does not contaminate the filling liquid. It is an object of the present invention to provide a container that does not have a problem in temperature control even if it is reduced, the whole work is simple, and can be used as it is for storage at the delivery destination.

[0006]

The gist of the present invention for achieving such an object is as follows. (1) A container having an inner bag for accommodating a filling liquid inside a body formed of foam, in which a plate-shaped heater is arranged between the inner surface of the body bottom foam and the inner bag. A foam container having an inner bag characterized by: (2) The container according to (1) above, wherein a heat dissipation plate having an area of at least 1.5 times the area of the heater is installed between the plate heater and the main body. (3) The container according to (1) or (2), wherein a temperature sensor is provided between the heater and the main body, and a temperature controller is connected to the sensor to control the temperature of the filling liquid within a certain range.

[0007]

[Function] Since the container body is made of foam, it has heat insulation properties, and since the heater is provided at the bottom of the inner bag, the desired temperature can be maintained even during transportation of the container or storage at the destination. The filling liquid can be heated and kept warm, and if necessary, the temperature of the filling liquid can be always kept within a certain range by measuring the liquid temperature with a temperature sensor and controlling ON / OFF of the temperature controller. Further, by interposing the heat dissipation plate, the heat from the heater is quickly released to the surroundings so that excess heat is not accumulated.

The present invention will be described in detail below with reference to the drawings. As shown in FIGS. 1 and 2, the container body 1 is made of a thick foam material such as styrofoam, and is composed of a body plate 2 having four circumferences, a bottom plate 3 having legs 5, and a top plate 4. . An inner bag 6 made of a plastic sheet for containing a filling liquid is housed in the container body 1. Further, on the bottom plate 3 of the container body 1, there is installed a heating device 7 for heating and keeping the filling liquid in the inner bag warm.

A concrete example of the heating device 7 is shown in FIG.
As shown in (b), a rectangular heat dissipation plate 9 stretched over the surface of the bottom plate 3
Similarly, a rectangular plate-shaped heater 8 is placed at the center, and another radiator plate 13 is formed on the heater 8 so as to cover the heater. Reference numeral 11 is a lead wire of the heater 8.

As an example of the heater 8, a nichrome element is coated with silicon rubber. As an example, the thickness is about 3 mm, the width is 250 mm, the length is 300 mm, and the capacity is 6 mm.
It is preferably about 00W. In the present invention, the plate heater 8 alone, that is, the mode in which the heat dissipation plates 9 and 13 are not provided in the illustrated example, is also targeted, but in this case, the temperature difference between the front and back sides is caused by the heat insulating property due to the thickness effect of the heater. Occurs.

That is, the inner surface side (front side) of the heater 8 is in contact with the inner bag, heat is continuously transferred to the liquid, and the equilibrium temperature is kept low, but the outer side (back side) of the heater is a foam having excellent heat insulating properties. Since it is in contact with the body of the product, heat builds up and the temperature rises.
As a result, the temperature difference between the front and back of the heater in the thickness direction is about 5
It reaches 0 ° C. On the other hand, when the foam is heated to 110 ° C. or higher, it softens and causes a shrink phenomenon, so it is desirable to maintain the temperature at 100 ° C. or lower. For this reason, it is necessary to keep the temperature of the filling liquid at about 50 ° C. at most, and in the case of only the heater, it is limited to the case where the liquid temperature is kept below 50 ° C. for transportation / storage.

The arrangement of the heat dissipation plate together with the heater is to prevent such trouble even if the liquid temperature is raised significantly. In particular, the heat radiating plate 9 provided between the heater 8 and the bottom plate 3 of the foam body transfers the heat generated on the back surface of the heater to the four circumferences and further transfers the heat from the inner bag to the filling liquid.
It serves to keep heat accumulation low. Thereby, for example, even if the heater is heated to maintain the liquid temperature at about 90 ° C., the container body is not adversely affected by the heat.

In order to effectively perform the function of such a heat dissipation plate, it is necessary to have at least a sufficient width. This is to secure the area necessary for radiating heat to the periphery of the heater. Specifically, at least 1.
It is necessary to give the heat sink 5 times the area. If the area is smaller than this, the temperature of the back surface will be high due to insufficient radiation, and the heat effect will appear on the main body. The upper limit area is preferably about 5 times. This is because the effect is saturated when the area is larger than this.

Further, other preferable conditions of the heat dissipation plate are that the heat conductivity is good and that the heat dissipation plate has a certain thickness or more. That is, as the material, select a material having good thermal conductivity such as aluminum, copper, or a brass plate,
Since the amount of heat conduction is proportional to the cross-sectional area of the plate, for example, 1 to 3 mm
It is desirable to select a plate with a moderate thickness. The reason is that if the thickness is 1 mm or less, the desired effect cannot be obtained, and if the thickness is 3 mm or more, the weight does not increase but the effect does not increase.

Next, in the present invention, as means for maintaining the temperature of the filling liquid within a certain range, as shown in FIGS. 4 (a) and 4 (b), a temperature sensor 10 such as a thermocouple type thermometer is provided with a heater 8.
It is placed in the lower part of the heater so that the heater temperature can be measured at all times, and the measured value is sent to the temperature controller to control the heater ON / OFF by comparing with the set temperature. The temperature sensor 10 can detect the temperature of the heater substantially accurately by forming a recess in the foam bottom plate 3 so as to contact the lower surface of the heat dissipation plate 9 and inserting the recess in the recess. When the heater is turned on, the generated heat is transferred to the filling liquid, while the heat on the back surface is slightly delayed through the heat radiating plate 9, but the sensor 1
It is transmitted to 0 in a short time. Therefore, by controlling the heater ON-OFF with the allowable temperature of the main body foam as the upper limit,
The temperature of the liquid can be controlled within a predetermined range safely and efficiently.

FIG. 5 shows an embodiment of the container of the present invention. Attach the temperature controller 14 to the side of the container body 1,
The temperature controller 14 and the temperature sensor 10 are connected, and the power cord 16 is connected to the heater 8 via the controller 14. An inner bag containing a predetermined filling liquid is housed in the container body 1. The controller 14 is provided with a digital switch 15 to set an appropriate temperature range corresponding to the filling liquid, and the heater 8 is turned on and off when the temperature goes out of the set temperature range.

[0017]

[Examples] Test conditions Filling liquid: trimethylolpropane (freezing point 59 ° C) Storage temperature: 80 ° C (70 ° C or more) Filling temperature: 85 ° C (80 ° C after transportation) Filling amount: 1000l Container body material: Styrofoam heater: Sheet Heater (Nichrome wire element, silicon rubber coating, thickness 3mm, width 250mm, length 300mm,
Capacity 600W) Heat sink: Aluminum plate (thickness 1.5mm, width 500mm,
Length: 500 mm) Temperature control: Sensor ... Thermocouple type thermometer, controller ...
Digital switch type temperature setter Temperature setting value: 90 ° C (actual temperature is 93 to 88 ° C)

Results When used in the summer under the above conditions and an outside air temperature of 30 ° C., the heater ON time is 21 seconds, OFF time is 46 seconds, and the load factor (ON time percentage) is about 32%. Could be maintained at 80-81 ° C. When the same thing is stored in a building with a temperature of 10 ° C, the heater ON time is 2
The load rate (ON time rate) is about 42% at 8 seconds and OFF time 39 seconds, and the filling liquid temperature can be maintained at 75 to 77 ° C.
There was no problem in either case. Also, during transportation, the container was loaded on a general flat-body truck, and the temperature of the filling liquid did not drop below 5 ° C. even after the required transportation time of about 24 hours, and there was no problem.

[0019]

According to the container of the present invention described above,
Since the heater is arranged at the bottom of the container, the liquid is appropriately circulated and can be maintained at a substantially uniform temperature, and since the container body is made of foam, the heat insulation is excellent and the power consumption of the heater is low. In addition, the filling liquid can be held at a predetermined temperature during transportation and storage, does not contaminate the liquid, and since the heater is fixed, filling and discharging of the liquid,
It does not hinder the replacement of inner bags.

According to the second aspect of the present invention, the heat of the heater is directed to the inner bag side by the heat radiating plate, so that the container body made of foam is not deformed and the temperature is close to the allowable temperature of the container body. Since the temperature of the filling liquid can be heated up to this, the range of application of the container is widened. Further, according to the third aspect of the present invention, the temperature of the filling liquid can always be efficiently controlled to be kept within a certain range.

[Brief description of drawings]

FIG. 1 is a plan view of a main body showing an embodiment of a container of the present invention.

FIG. 2 is a front view of FIG.

3A and 3B are a detailed plan view and a sectional view of the heating device in FIG.

4A and 4B are a plan view and a cross-sectional view of the temperature sensor installation state in FIG.

FIG. 5 is a perspective view showing an embodiment of the present invention.

[Explanation of symbols]

 1 Container Main Body 2 Main Body Bottom Plate 3 Main Body Bottom Plate 4 Main Body Top Plate 5 Bottom Plate Leg 6 Inner Bag 7 Heating Device 8 Heater 9,13 Radiator 10 Temperature Sensor 11, 12 Lead Wire 14 Temperature Controller 15 Digital Switch 16 Power Cord 17 Filling liquid

Claims (3)

[Claims] 1. A container having an inner bag for accommodating a filling liquid inside a main body made of foam, wherein a plate-shaped heater is arranged between the inner surface of the bottom foam of the main body and the inner bag. A foam container having an inner bag characterized by the above. 2. The container according to claim 1, wherein a heat radiating plate having an area of at least 1.5 times the area of the heater is installed between the plate heater and the main body. 3. The container according to claim 1, wherein a temperature sensor is provided between the heater and the main body, and a temperature controller is connected to the sensor to control the temperature of the filling liquid within a certain range.