JPS5919277Y2 - Decompression-resistant microwave drying container - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a vacuum-resistant microwave heating and drying container for drying radioactive materials such as experimental animals to which radioactive substances have been administered under reduced pressure by microwave heating.

Previously, there was no way to dispose of experimental animals such as mice, rats, and rabbits that had been administered radioactive substances, so they were crushed in formalin and stored permanently.

This approach only increases the amount of storage.

Therefore, recently, experimental animals are placed in a container in a microwave oven, and the container is vacuumed and the pressure is reduced while microwave heating is performed to evaporate body fluids and dry the experimental animal in this dry state. They are stored and when the number reaches a certain level, they are transported to a place with appropriate incineration equipment and incinerated.

When experimental animals are dried by microwave heating in this way, their weight becomes approximately 100% higher than before dehydration, and due to the sterilization effect of microwave heating, dried animals can be stored at room temperature for long periods of time, and can be further incinerated. It also has the advantage of being easy to perform.

In this case, conventionally, for the dry container containing the experimental animal,
Drying was performed by supplying air into the container at a constant flow rate through one hole while applying microwaves, and continuously exhausting air through the other hole.

However, this method of drying has the drawback that the pressure reduction inside the drying container is poor due to the supply of air, resulting in a long drying time and poor efficiency.

An object of the present invention is to provide a vacuum-resistant microwave drying container that can shorten the drying time and also solve the problems that occur with the shortened drying time.

Hereinafter, specific examples of the present invention will be explained in detail with reference to the drawings.

As shown in FIGS. 1 and 2, the container 7 of this embodiment has a container body 10 having a rectangular parallelepiped shape and an opening 9 in order to increase the space utilization rate of the heating chamber 8 of the microwave oven. The lid 11 that closes the is shaped like a flat plate.

Further, in order to increase the microwave heating efficiency, the container body 10 and the lid 11 are made of a heat-resistant polymer resin with high microwave transmittance so as to be able to withstand reduced pressure.

As the heat-resistant polymer resin with high microwave transmittance that forms the container body 10 and lid 11, for example, polycarbonate, polypropylene, Teflon, etc. can be used.

The container body 10 and the lid 11 have an airtight structure to prevent air from being sucked in. A gasket 12 made of silicone rubber or the like is interposed between the container body 10 and the lid 11.
1 is airtightly fixed to the container body 10 with screws 13 made of heat-resistant polymer resin.

As the heat-resistant polymer resin forming the screw 13, for example, Teflon can be used.

The container body 10 is equipped with a vacuum male joint 14 and a vacuum hole protector 16 that protects the vacuum hole 15 in the joint 14 from being blocked by adsorption of objects to be processed during vacuum evacuation.

The vacuum hole protector 16 has its surface facing the object to be processed blocked, and an intake port 17 is opened in the body instead, so that even if the object to be processed is sucked, the inlet port 1 is closed.
7 is not blocked.

The joint 14 and the protector 16 are made of the same material as the container body 10.

At the corner of the heating chamber 8 of the microwave oven, a female joint 18 for evacuation that is fitted into the male joint 14 of the container 7 is provided, and a vacuum hose 19 is connected to this joint 18. There is.

When a vacuum drying experiment was carried out on one rabbit using the microwave drying apparatus shown in FIG. 3 in the container 7, the following results were obtained.

Prior to the experiment, a rabbit weighing 2450 g was placed in a cotton bag with its abdomen and thorax opened.

Close the mouth of the bag, put it into the container body 10, and put it in the lid 11.
The container was placed in the heating chamber 8 of a 600W microwave oven 20 with the lid 11 fixed with the screws 13.

In this case, even if one rabbit was placed in the container 7, since it was a rectangular parallelepiped, the rabbit could be accommodated in the heating chamber 8 of the 600 W microwave oven 20 without getting stuck at the top or bottom.

At this time, the male joint 14 of the container 7 was connected to the female joint 18 on the side of the microwave oven by fitting.

Silicone grease was applied to the contact surfaces of side joints 14 and 18 to ensure airtightness.

In this state, the primary side cooler (Freon cooler) 21 and circulation pump 22 of the microwave dryer in which the microwave oven 20 is installed are operated to bring the refrigerant 24 in the secondary refrigerant container 23 to a predetermined low temperature. After the pressure reached 100 mmHg, the vacuum pump 25 was activated, and when the pressure became 100 mmHg or less, the microwave oven 20 was activated.

The body fluid evaporated from the rabbit by the operation of the microwave oven 20 is
It passed through a hose 19 and was condensed in a two-stage secondary cooler 26, 27, liquefied, and collected in a receiver 28.

The gas that has passed through the cooler 27 is sent to the adsorber 29 and the vacuum pump 2.
5 and was released to the outside.

When the evaporation of body fluids stopped, the moisture detector 30 detected this, and the device was automatically stopped under the control of the control device 31.

As a result, the drying time was 2 hours and 15 minutes, and the amount of body fluid was 1
700 cc was distilled out, and the weight of the rabbit after drying was 820 g, which was about the same weight as before drying.

In this case, the surface temperature of the container 7 was 60° C., no deformation was observed, and it was confirmed that the container 7 could be used satisfactorily.

When we conducted drying experiments on rats in a Pyrex glass container in the past, we found that approximately 2
However, according to the present invention, as mentioned above, it takes 2 hours.
．． The heating time was 2 hours and 15 minutes for 45 kg, proving that the heating efficiency was significantly improved.

This is because the inside of the container 7 was evacuated to reduce the pressure, and the microwave transmittance of the container 7 was good, so that the microwaves could be effectively irradiated onto the object to be processed.

Moreover, even if the inside of the container 7 was evacuated to reduce the pressure, the vacuum hole 15 was not blocked by the object to be processed because the vacuum hole protector 16 existed.

Incidentally, the container according to the present invention is not limited to one having an open top, but may have an open side surface as shown in FIG. 4, for example, and the lid 11 may be airtightly attached thereto.

If this structure is used and the object is placed in the heating chamber of a microwave oven with the lid 11 facing forward, the object to be processed can be taken in and taken out by removing the lid 11 without having to take out the heavy container 7.

The container could be made of glass and shaped like a rectangular parallelepiped, but
Experiments have revealed that such rectangular parallelepiped containers made of glass tend to break when subjected to microwave heating under reduced pressure, making them unusable.

Furthermore, as mentioned above, glass has poor microwave transmittance, which is not preferable.

The objects to be treated are not limited to experimental animals to which radioactive substances have been administered, but also excrement containing radioactive substances, plants to which radioactive substances have been administered, etc. can be similarly treated.

As explained above, the decompression-resistant microwave heating drying container according to the present invention has a structure that reduces the pressure by vacuuming the inside in a sealed state, so the drying time is shorter than that of the type that exhausts air while supplying air. It is possible to shorten the time and perform microwave drying work efficiently.

In particular, although the present invention has a structure that evacuates the inside of the container, a protector around the vacuum hole is provided protruding from the container body or the inner wall of the lid in correspondence with the vacuum hole, so that it will not be exposed when the vacuum is drawn. It is possible to prevent the processed material from being sucked in and blocking the vacuum hole, and problems associated with vacuuming can also be solved.

[Brief explanation of drawings]

1 and 2 are a plan view and a vertical cross-sectional view showing an embodiment of the container according to the present invention, FIG. 3 is a schematic diagram of a microwave drying device, and FIG. 4 is a diagram showing other containers according to the present invention. FIG. 7... Container, 10... Container body, 11
...Lid, 14...Vacuum joint, 1
5...Vacuum hole, 16...Vacuum hole circumference protector, 17...Intake port.

Claims (1)

[Scope of utility model registration request] In a vacuum-resistant microwave drying container for heating and drying the object to be processed with microwaves while reducing the pressure inside the container body in a microwave oven with the object to be processed placed inside the container body and with the lid closed. The container body and the lid have an airtight structure to prevent air from being sucked in, and either the container body or the lid is provided with a vacuum hole, and the container body or the lid is provided with a vacuum hole corresponding to the vacuum hole. A vacuum hole circumferential protector is provided protruding from the inner wall of the lid, a surface of the vacuum hole circumferential protector facing the workpiece is closed, and an intake port communicating with the vacuum hole is provided in the body of the protector. A vacuum-resistant microwave drying container characterized by: