JP2643866B2 - Microwave heating equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat treatment apparatus for heat-treating waste, especially waste such as garbage containing water, and more particularly to heat treatment using electromagnetic waves including microwaves. The present invention relates to an apparatus for performing microwave heating.

[0002]

2. Description of the Related Art Waste containing water, such as garbage discharged from a kitchen at home, can be subjected to electromagnetic heating by utilizing the large dielectric loss of water. Such electromagnetic heating has already been widely used as an industrial or household microwave oven (for example, see
-115687).

If an electromagnetic wave is efficiently guided to waste, water can be evaporated and dehydrated in a shorter time. In particular, when the object to be heated contains a large amount of water such as garbage, it is important to efficiently irradiate such electromagnetic waves.

Accordingly, the applicant of the present invention has disclosed in Japanese Patent Application No. 6-9029 that a container for holding an object to be heated is made of a tapered shape such as a cone, a pyramid, a wedge or a bowl having a low magnetic loss and low dielectric loss. It has been proposed that the tip be positioned in the waveguide in such a direction that the tip is arranged to face the direction in which the electromagnetic wave is generated. According to this proposal, the lossy body such as waste in the container has a shape following a tapered container such as a wedge. Therefore, as can be seen from the fact that this has almost the same shape as the radio wave absorber used in the anechoic chamber, the lossy body such as waste in the container is irradiated from the side facing the tapered tip portion. Microwaves will be efficiently absorbed.

Another feature of the proposed heat treatment apparatus is that a container containing a lossy substance such as waste is placed in the waveguide. By arranging such a container in the middle of the waveguide through which the microwave travels, the microwave can travel backward from the tapered tip portion. Thus, according to this proposal, it is possible to achieve extremely high absorption efficiency for microwaves.

[0006]

As described above, in this proposal, a high microwave absorption rate can be achieved by devising the arrangement and shape of the container. However,
If the waste contains a large amount of water, there is a problem that the time of the dehydration process becomes longer in accordance with the amount of the water. For example, using electromagnetic wave energy of 1400 W, 6
For example, in a case where 2.5 g of water is subjected to a dehydration treatment from 27 ° C., it takes 13.6 seconds to heat this to 100 ° C. moisture. Further, in order to heat and vaporize the water at 100 ° C., 100.9
Seconds are required. Since most of the dehydration time is used to evaporate water as described above, if the dehydration processing is performed with a large amount of water, such as garbage, or when the water is not sufficiently drained, the inside of the container is used. There is a problem that it takes a relatively long time until the dewatering of the waste is completed.

An object of the present invention is to provide a microwave heating apparatus capable of performing a dehydration treatment in a relatively short time even when waste contains a large amount of water. is there.

Another object of the present invention is to provide a microwave heating apparatus which is inexpensive and easy to maintain.

[0009]

According to the first aspect of the present invention, there are provided (a) an electromagnetic wave generator, (b) a waveguide for guiding an electromagnetic wave generated by the electromagnetic wave generator, and (c) a low-loss material. The tip has a tapered shape and the opposite side is open, a plurality of holes are drilled in the side surface, and a waste heating container arranged in the waveguide; and (d) a water storage tank. (E) The microwave heat treatment apparatus is provided with a drain pipe for guiding the water passing through the hole of the container to the water storage tank.

[0010] That is, according to the first aspect of the present invention, a plurality of holes are provided in the waste heating container so that the water can be collected in the water storage tank without evaporating therefrom. Was not required to be vaporized, and the time until the completion of dehydration was shortened by this amount.

[0011] The invention according to claim 2 is characterized in that the drain pipe is a metal pipe, and each side of the cross section is shorter than half the wavelength of the electromagnetic wave generated by the electromagnetic wave generator. This eliminates the need to shield the waveguide on the drain pipe side with a metal mesh or the like, thereby simplifying the structure, eliminating clogging, and simplifying maintenance.

The invention according to claim 3 is characterized in that an air-cooling drain pipe is arranged to cool the water evaporated once by heating the waste in the container and to guide the water to a water storage tank.
Thereby, a water storage tank can be shared.

[0013] The invention according to claim 4 is characterized in that an ozone deodorizer is arranged in the water storage tank. This makes it possible to deodorize the moisture of waste such as garbage.

[0014] The invention according to claim 5 is characterized in that the front end of the container is disposed downward, and a lid covered with a metal mesh is removably disposed on the opposite open side. As a result, not only can electromagnetic waves be shielded, but also the steam is cooled through the metal mesh and easily collected in the water storage tank.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments.

FIG. 1 shows a schematic configuration of a microwave heating apparatus according to an embodiment of the present invention. The apparatus 10 includes a box-shaped apparatus main body 11, a lid 12 detachably disposed on an upper part thereof, and a box-shaped water storage tank 13 also detachably disposed below the apparatus main body 11. I have.

An electromagnetic wave generator 15 having a built-in magnetron is disposed inside the apparatus main body 11, and an interlock switch (not shown) operated by attaching and detaching the lid 12, an operation switch, and a power supply (not shown) via a timer. It is connected to the. The electromagnetic wave output from the electromagnetic wave generator 15 is directed to the first cylindrical waveguide 1 that is oriented horizontally.
From 6, it is guided to a funnel-shaped second waveguide 17. The conical portion at the top of the second waveguide 17 accommodates a conical waste storage container 18 having a size smaller than that of the second waveguide 17. A number of small holes 19 are formed in the side surface of the waste container 18.

The lower portion of the second waveguide 17 is also funnel-shaped, and is connected to a first drain pipe 21 made of metal and having a rectangular cross section. The first drain pipe 21 is a second drain pipe that is vertically arranged to be in contact with the external panel of the apparatus main body 11.
With the drain pipe 23. The cross section of the second drain pipe 23 is also quadrangular. The water tank 13 is arranged below the lower end of the second drain pipe 23. An ozone deodorizer (not shown) is arranged near the water storage tank 13.

The lid 12 is made of plastic, has a hollow interior, and has a metal mesh 25 for shielding electromagnetic waves at a portion corresponding to the upper end of the second waveguide 17.
Is arranged to cover this.

The electromagnetic wave generator 15 of the microwave heat treatment apparatus 10 according to the present embodiment having such a configuration generates an electromagnetic wave having a frequency of 2.45 GHz, similarly to a microwave oven. The first drain pipe 21 also has a function of shielding electromagnetic waves guided to the second waveguide 17. For this reason, in this embodiment, one side is 40 mm. In order to shield electromagnetic waves, it is necessary that the long side is shorter than a half wavelength. In the case of an electromagnetic wave having a frequency of 2.45 GHz, the wavelength is 12.24 cm and one side is 61
It suffices if it is shorter than mm. In practice, it is often set to a length of about two-thirds, with some margin, rather than one-half of the operating frequency. Therefore, in the microwave heating apparatus 10 of the present embodiment, one side is set to 40 mm.

The original function of the first drain pipe 21 is to collect the moisture of the waste stored in the waste storage container 18 into the water storage tank 13 through the hole 19. Waste container 1
Numeral 8 is made of a low-loss substance as a substance having a small imaginary part of the dielectric constant in order to allow electromagnetic waves to pass therethrough. This material must also have heat resistance. In this embodiment, polyphenylene sulfide (PPS) is used as a heat-resistant resin. Depending on the device, it is also possible to use glass or Teflon.

The waste container 18 has a large number of small holes 1.
9 is open. These holes 19 have a diameter of 0.5 mm to 2 mm.
It has a circular shape of about mm or an opening area of the same size. When waste containing a large amount of water, such as garbage, is stored in the waste storage container 18, excess water is removed from these holes 19.
Through the conical side wall of the second waveguide 17 to be collected in the first drain pipe 21. These are collected in the water tank 13 without going through the heating process.
As described above, the water content of the waste decreases before the heating, so that the dehydration time can be shortened accordingly.

When the electromagnetic wave generator 15 starts operating,
Since the waste is heated, moisture is further dropped from the hole 19 due to shrinkage of the garbage and the like, and the waste is vaporized. What drops from the hole 19 is collected in the water storage tank 13 via the first drain pipe 21 in the same manner as described above.
Since these moistures are before vaporization, they contribute to shortening of the dehydration treatment time similarly to those in which all the moisture is vaporized. The vaporized material passes between the metal meshes 25 of the lid 12 and passes through the second drain pipe 2 on the apparatus body 11 side.
The water moves in three directions, and the water cooled in this process travels through the second drain pipe 23 and is collected in the water storage tank 13. The unliquefied steam is discharged from the lower end of the second drain pipe 23 to the outside.

The lower end of the second drain pipe 23 is connected to the water tank 1.
3 may be extended to the vicinity of the bottom. Thus, the steam discharged from the second drain pipe 23 is actively cooled.

In the embodiment described above, the waste container 18 has a cylindrical shape. However, the waste container 18 may have any shape as long as electromagnetic waves can be efficiently irradiated. That is, the shape is not limited to a conical shape, but may be a tapered shape such as a pyramid, a wedge, or a bowl. Further, in the embodiment, the tip of the waste storage container 18 is arranged downward, but if the waste is stored and closed, it may be set in another direction such as a horizontal direction. In this case, it is necessary to consider the source of the electromagnetic wave or the shape of the waveguide so that the electromagnetic wave is emitted from the tip side.

In the embodiment, the water in the waste stored in the waste storage container 18 is naturally discharged. However, when the lid is closed, the waste is compressed or the waste storage container 18 itself is compressed. May be rotated at a high speed to actively dehydrate water in advance.

Further, in the embodiment, the apparatus main body 11 and the water tank 13
Although the shapes such as have been specifically described, it goes without saying that these can take various shapes. Further, the water storage tank 13 can be variously modified such as being arranged in a drawer inside the apparatus main body. Further, the wavelength of the electromagnetic wave generated by the electromagnetic wave generator 15 is not limited to the embodiment.

[0028]

As described above, according to the first aspect of the present invention, a plurality of holes are provided in a waste heating container so that water other than the water evaporated from the holes can be directly collected in a water storage tank. So there is no need to vaporize all the water in the waste,
This can shorten the time until the completion of dehydration. Therefore, running costs can be significantly reduced by reducing power consumption.

According to the second aspect of the present invention, the drain pipe is formed of a metal pipe, and each side of the cross section is shorter than half the wavelength of the electromagnetic wave generated by the electromagnetic wave generator. In addition, there is no need to shield the waveguide on the drain pipe side with a metal mesh or the like, so that the structure can be simplified, clogging can be eliminated, and maintenance can be simplified.

Further, according to the third aspect of the present invention, the water once evaporated by heating the waste in the container is cooled and guided to the water storage tank, and the water taken out from the hole of the waste heating container is also cooled. Since the water tank is guided to the water tank, the water tank can be shared and the configuration of the apparatus can be simplified. The path leading to the water storage tank can also be used as a steam exhaust port.

According to the fourth aspect of the present invention, the water tank is provided with an ozone deodorizer. This makes it possible to deodorize the moisture of waste such as garbage.

According to the fifth aspect of the present invention, the tip of the container is arranged downward, and the lid covered with the metal mesh is detachably arranged on the open side opposite to the container. In addition to shielding electromagnetic waves, the steam is cooled through the metal mesh and easily collected in the water storage tank.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically showing a microwave heating apparatus according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Microwave heat treatment apparatus 11 Device main body 12 Lid 13 Water storage tank 15 Electromagnetic wave generator 16 1st waveguide 17 2nd waveguide 18 Waste container 19 Hole 21 1st drainage pipe 23 2nd drainage pipe 25 Metal mesh

──────────────────────────────────────────────────の Continuation of the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical indication location H05B 6/64 B09B 3/00 301B 5/00 P

Claims (5)

(57) [Claims] 1. An electromagnetic wave generator, a waveguide for guiding an electromagnetic wave generated by the electromagnetic wave generator, and a tapered tip made of a low-loss material, and the opposite side is open, A container for heating waste disposed in the waveguide with a plurality of holes perforated therein, a water storage tank, and a drain pipe for guiding moisture passing through the hole of the container to the water storage tank. A microwave heating apparatus characterized by the above-mentioned. 2. The drain pipe is a metal pipe, and each side of the cross section has a wavelength of 2 mm of an electromagnetic wave generated by the electromagnetic wave generator.
2. The microwave heating apparatus according to claim 1, wherein said apparatus is shorter than one-half. 3. The microwave heating system according to claim 1, further comprising an air-cooling drain pipe that cools water once evaporated by heating the waste in the container and guides the water to the water storage tank. Processing equipment. 4. The microwave heating apparatus according to claim 1, wherein an ozone deodorizer is disposed in the water storage tank. 5. The microwave according to claim 1, wherein the tip of the container is arranged downward, and a lid covered with a metal mesh is removably arranged on the open side. Heat treatment equipment.