JP2005326050A - Dried object drying method and device utilizing dielectric heating - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently and surely dry dried objects without browning and melting the dried objects made of various materials, damaging buttons, metal fittings or the like attached to clothing or the like by generated heat, and causing ignition in drying the clothing or the like by utilizing microwaves generated from a magnetron. <P>SOLUTION: The electric power of microwaves generated from the magnetron is controlled to achieve electric field strength of 1,500 [V/m] or less to the dried object of dielectric loss tangent tanδ of 0.1 or more and less than 1.0, electric field strength of 5,000 [V/m] or less to the dried object of dielectric loss tangent tanδ of 0.01 or more and less than 0.1, and electric field strength of 9,000 [V/m] or less to the dried object of dielectric loss tangent tanδ of 0.001 or more and less than 0.01, and this drying method is dried to the dried object to apply the microwave which is controlled by the electric power. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a drying method and a drying apparatus for an object to be dried using dielectric heating. More specifically, the present invention does not scorch or melt dry objects made of different types of materials in the case of performing a drying process using a dielectric heating phenomenon by irradiating microwaves oscillated from a magnetron. Also, for example, to improve the magnetron control technique for efficiently and accurately drying an object to be dried without causing damage due to heat generation of buttons or metal fittings on clothing, and without causing an ignition phenomenon. .

  For example, as a conventional method used for drying clothes with heat, a hot air drying method using oil, gas, or an electric heater as a heat source is the mainstream, and drying apparatuses incorporating this method are widely used. However, this drying method involves heating the object to be dried from the outside and gradually drying it from the surface layer, so it is difficult to remove the internal humidity. In addition, it has a feature that there is a limit to shortening the drying process time.

  While the hot air drying method is used in this way, a drying method that uses microwaves to heat the moisture inside the object to be dried directly and uniformly to generate heat is also used. Yes. Since this drying method can heat an object to be dried from the inside, it has characteristics that the drying processing time can be shortened, the running cost can be reduced, and the drying can be efficiently performed (for example, patent document). 1).

  Conventionally, as a drying method using a microwave, in order to dry an object to be dried in a short time, a drying process is generally performed by driving a magnetron near the maximum output value of microwave power. Alternatively, for the purpose of performing a more efficient drying process, a drying method in which the microwave output is changed from a large output to a small output, or conversely from a small output to a large output has been performed (for example, Patent Document 2).

  In addition, the technique of drying an object using microwaves as described above is also applied to garbage, for example, putting garbage in a processing container, stirring, and chopping with a rotating cutter A garbage disposal machine that irradiates microwaves and heats them to dry is proposed (see Patent Document 3).

Japanese Patent Laid-Open No. 2001-194067 JP-A-11-63836 Japanese Patent Laid-Open No. 2002-370079

  However, driving the magnetron near the maximum output value of the microwave power as described above to perform the drying process has the following problems. That is, in the initial stage of the drying operation, a large amount of moisture is present in the object to be dried. At this stage, moisture absorbs the microwave power and consumes the output, but there is no problem. When it reaches a stage where the moisture in the dried object is extremely low (for example, when the moisture of the dried object is about 10% or less of the mass of the dried object), the electric field strength of the dried object increases. As a result, a problem that a part of the object is burnt or burnt has been a problem.

  In addition, some of these microwave drying processes adopt or rely on the conventional microwave magnetron control technology. In such a case, since the magnetron driving power source is operated with a high output to oscillate a high energy microwave, a part of the dry object may be damaged as in the case described above.

  Furthermore, when the object to be dried is clothing, for example, it is rare that the materials of a plurality of clothing are the same or the same, and various materials such as buttons and zippers are included. There are many things. In such a case, when the heat resistant temperature of each material is exceeded due to heat generation or sparks, it is inevitable that these buttons will be deformed or damaged. Therefore, when metals, plastics, and the like are included, a normal drying process cannot be performed, and only limited functions such as a heating function may be used.

  In addition, in order to solve the problem that the object to be dried is burnt or burnt in this way, a method of performing a drying process while adjusting the output of the magnetron has been tried. Since various fiber materials are mixed and there are parts made of different materials such as buttons and fasteners, there is a problem that it is difficult as a practical problem. In other words, if the magnetron drive power supply is operated at a high output, the drying object itself may be partially damaged such as scorching or melting, and there may be problems such as sparks occurring on buttons and metals attached to the drying object. Arise. In addition, as a solution to such a problem, a countermeasure method based on on / off control that weakens the average value of the microwave power by intermittent driving by turning on / off the magnetron power supply has been proposed, but the dry object is damaged. It has not yet been completely solved.

  Further, in the case of drying garbage using microwaves, it is difficult to control magnetron using microwaves because a dry object such as garbage has a large volume reduction rate. For this reason, although the technique of drying raw garbage using a microwave as mentioned above is proposed, there is no machine for drying raw garbage completed by a domestic machine manufacturer. The main reason for the difficulty in drying garbage is that if the mass or moisture content of the object to be dried is reduced, the matching of microwaves will occur and magnetron will be deteriorated. As a result, sparks may cause the drying container to deteriorate.

  Therefore, the present invention uses a microwave oscillated from a magnetron to dry a dry object such as clothes or even garbage, and does not scorch or melt a dry object made of different types of materials, In addition, drying of dry objects using dielectric heating is performed to efficiently and accurately dry an object to be dried without causing damage due to heat generated by buttons or metal fittings on clothing, and without causing an ignition phenomenon. It is an object to provide a method and a drying device.

  In order to achieve this object, the present inventor has conducted various studies. First of all, the output control itself for the purpose of preventing the dried object from being burnt or melted, partly damaged by heat generated from buttons or metal fittings on clothing, ignition phenomenon etc. Although it has been carried out as described above, it has not yet reached an effective control means. In other words, since there has been no technology that solves both the problem of efficiently drying the object at the same time while reliably preventing the occurrence of burns and sparks, the present inventor has challenged such a problem, As a result of repeated examinations and experiments, we have come to know the technology that can effectively realize these by focusing on the “dielectric loss tangent tanδ” that represents the angle of the pure resistance current flowing inside the dielectric. .

  The present invention has been made on the basis of such knowledge, and the invention according to claim 1 is directed to a dry object using dielectric heating that performs a drying process by irradiating a dry object such as clothing with a microwave oscillated from a magnetron. In the drying method, the upper limit value of the absorbed power of the microwave is determined according to the value of the dielectric loss tangent tan δ of the object to be dried, and the drying process is performed by irradiating the microwave while controlling the power value within the range of the power upper limit value. It is characterized by performing.

  Here, “dielectric loss tangent tan δ” will be described. When a high-frequency voltage is applied to the dielectric, a high-frequency current whose phase is advanced by 90 degrees with respect to the high-frequency voltage flows. At this time, if the dielectric is ideal, the phase angle is exactly 90 degrees. However, in practice, the phase is delayed by an angle δ as the frequency of the applied voltage increases. Taking this into account, the delay angle θ (= π / 2−δ) between the AC voltage applied to the dielectric and the high-frequency current generated thereby is the “dielectric phase angle”. The angle δ at this time is a “dielectric loss angle”. A dielectric having a larger dielectric loss angle δ has a higher dielectric loss, and therefore a greater degree of dielectric heating. To represent the degree of dielectric loss, tan δ which is a tangent of dielectric loss angle δ is used. This tan δ is the “dielectric loss tangent”. When the voltage applied to the dielectric is V and the current is I, VIcosθ, that is, a value obtained by multiplying the high-frequency voltage value by the high-frequency effective current value is a value indicating high-frequency power loss, that is, dielectric loss. At this time, the dielectric itself generates a heat generation phenomenon, and a part of the high frequency power is converted into heat energy (dielectric heating phenomenon).

The invention according to claim 2 is the method for drying an object to be dried using dielectric heating according to claim 1, wherein the microwave absorption power is P [W], the microwave frequency is f [Hz], and the object is dried. Where the relative dielectric constant is ε _s , the volume of the dry object is Q [m ³ ], and the electric field strength is E [V / m], the formula P = 2πf · ε ₀ · ε _s · Q · E ² · tanδ
Further, the upper limit value is determined by calculating the absorbed power of the microwave.

First, the microwave absorption power p [W / m ³ ] per unit volume of the object to be dried can be obtained by Equation 1.
[Equation 1]
p = ω ・ ε ・ E ²・ tanδ
= 2πf · ε ₀ · ε _s · E ² · tan δ
However,
ω: angular frequency ε: dielectric constant ε ₀ : vacuum dielectric constant E: electric field strength f: microwave frequency [Hz]
Moreover, when the numerical values are simplified by substituting the numerical values into π and ε ₀ that are elements (constants) that do not change, the following is obtained.
p = 0.556 ・ ε _s・ tanδ ・ f ・ E ²・ 10 ^-10 [W / m ³ ]

Here, the contents of Equation 1 will be supplementarily described as follows. That is, when calculating | requiring the electric power P which concerns on heat_generation | fever, it can obtain | require by the following formula | equation.
P = E ² / R
= E ² · tanδ · 2πfC
= E ² · tanδ · 2πf · S / d [W]
However,
R: Reactance of dielectric (X _c = 1 / 2πfC)
S: Area of electrode [m ² ]
d: Electrode distance [m]
The equation for obtaining the capacitance of the capacitor is C = ε ₀ · ε _s · S / d
It is. Here, S is replaced with the bottom area of the dielectric, d is replaced with the thickness of the dielectric (the length of the ridge of the cube), and the microwave absorbed power p per unit volume of the dielectric (the object to be dried) is considered.
p = P / (S · d)
= (E ² · tanδ · 2πf · ε ₀ · ε _s ) / d ²
= (E / d) ² · tanδ · 2πf · ε ₀ · ε _s
= (E / d) ² · tan δ · f · ε _s × 5.56 × 10 ^-11 [W / m ³ ]
Since d = 1, p = E ² · tan δ · f · ε _s × 5.56 × 10 ^-11 [W / m ³ ]
＝ 0.556 ・ ε _s・ tanδ ・ f ・ E ²・ 10 ^-10 [W / m ³ ]
Thus, it can be seen that the above equation is equivalent.

Further, when the volume of the dielectric (the object to be dried) is Q [m ³ ], the equation for obtaining the microwave absorbed power P in the entire object to be dried is as shown in Equation 2 below.
[Equation 2]
P = 2πf · ε ₀ · ε _s · Q · E ² · tan δ
However,
P: Microwave absorption power [W]

  According to a third aspect of the present invention, in the method for drying an object to be dried using the dielectric heating according to the second aspect, microwave power oscillated from the magnetron is applied to the object to be dried having a dielectric loss tangent tanδ of 0.1 or more and less than 1.0. On the other hand, the electric field strength is a value of 1500 [V / m] or less, and the electric field strength is a value of 5000 [V / m] or less and the dielectric loss tangent tan δ is 0.001 for a dry object having a dielectric loss tangent tan δ of 0.01 to less than 0.1. For a dry object of 0.01 or more and less than 0.01, the electric field strength is controlled to a value of 9000 [V / m] or less, and the drying object is subjected to a drying process by irradiating the dry object with the power-controlled microwave. It is a feature. In the present invention, the microwave power output range of each magnetron is limited to the range of the electric field strength value determined from the dielectric loss tangent tan δ, and is continuously driven within the limited range. Different control is to be performed.

Here, description will be made with reference to FIG. 28 showing the relationship (frequency f = 2450 MHz) of the relative dielectric constant ε _s of the substance, the dielectric loss tangent δ, and the penetration depth of radio waves (power half depth m) (note that the frequency f = 2450 MHz). ("Penetration depth (power half depth m)" in the figure indicates the power attenuation of the microwave, and represents a depth value at which a value obtained by a certain calculation formula not described here is 1/2) . In the present invention, various materials (substances) that can be dried objects are classified according to the degree of dielectric loss described above. Specifically, paying attention to the dielectric loss tangent δ indicating the degree of the dielectric loss, the logarithmic graph is divided into a region where the dielectric loss tangent tan δ is 0.1 or more and less than 1, a region where 0.01 or more and less than 0.1, and a region where 0.001 or more and less than 0.01. (See FIG. 28). When the relative permittivity ε _s is taken on the other axis (vertical axis) and various materials are entered for each characteristic in the logarithmic graph, the relative permittivity ε _s is 10 or less. . It is unlikely that water, methyl alcohol, sand (moisture of 17%) having a relative dielectric constant ε _s exceeding 10 itself becomes a dry object. However, for example, in the case of raw garbage, there are those that exceed this value, such as the relative dielectric constant ε _s approximately between 50 and 70, but this does not mean that such a substance is excluded from the object to be dried.

  Next, regarding the upper limit of the electric field strength value in each section, in the present invention, a region where the dielectric loss tangent tan δ is 0.1 or more and less than 1 is “section A”, a region where 0.01 or more and less than 0.1 is “section B”, and 0.001 or more and less than 0.01 Is defined as “Category C”, and an appropriate electric field strength value is specified for each division. Specifically, each value of “Category A” is set to 1500 [V / m], “Category B” is set to 5000 [V / m], and “Category C” is set to 9000 [V / m]. By irradiating the microwaves within the range having the upper limit of the range, it is possible to perform the drying process safely and efficiently without damaging the object to be dried even when various substances are mixed. In addition, the upper limit of the electric field strength value when the dielectric loss tangent δ of the dry object extends over the above “Category A”, “Category B”, and “Category C” is as follows. That is, when various substances are mixed in both areas of Category A and Category B, the upper limit value of the electric field strength value of Category A has priority, and various substances are mixed in both areas of Category B and Category C. When it is, the upper limit value of the electric field strength value of section B is given priority, and the lower limit value is adjusted. Here, the upper limit values of the electric field strength values will be described as follows.

  According to Formula 2, it can be seen that the microwave absorbed power with respect to a mass of 1000 g in a space having an electric field intensity value of 1500 [V / m] is approximately 306 [W]. Therefore, if the dry object is half of 500 g, the microwave absorption power is also half (approximately 158 [W]). On the other hand, the heat of gas under atmospheric pressure is approximately 28 [J / K · mol], and the volume per 1 mol (mol) of gas under atmospheric pressure is approximately 22.4 [L (liter)]. In consideration of the above, for example, assume that the flow rate of gas flowing into the apparatus is 11 [liters / second]. When 11 liters of gas is flowed for 1 second, the heat quantity of about 14 [J] can be taken, so the heat quantity (for example, about 158 [W] in this example) supplied to the dry object 500 g in the shield space is about 11 The calculation result that it is possible to take away in seconds is obtained. The air volume of 11 [liter / second] here is a sufficient and realistic value for the gas flow rate in the drying apparatus, and can be implemented even with a small machine.

  For “section B”, the microwave absorption power for a mass of 1000 g in a space with an electric field strength value of 5000 [V / m] is about 340 [W], and therefore for a dry object of 500 g, about 170 [ W], and the gas flow rate equivalent to “Category A” can sufficiently function as a drying device.

  Furthermore, for “Category C”, the microwave absorption power for a mass of 1000 g in a space having an electric field strength value of 9000 [V / m] is approximately 110 [W], and therefore, for a dry object of 500 g, approximately 55 [ W], and the gas flow rate equivalent to “Category A” can sufficiently function as a drying device.

  In addition, as in the invention described in claim 4, when the drying process is continued in a state where the moisture of the drying object is 10% or less of the mass of the drying object, the cooling air in the drying chamber container is forced. It is preferable to circulate.

  Furthermore, the invention described in claim 5 is directed to a drying apparatus for drying objects using dielectric heating in which microwaves oscillated from a magnetron are irradiated to a drying object such as clothing to perform drying treatment. An electric field intensity sensor that measures the ratio absorbed by the dry object, and a magnetron control device that controls the power of the microwave according to the characteristics or properties of the dry object, the magnetron control device, The electric field strength is 1500 [V / m] or less for a dry object having a dielectric loss tangent tan δ of 0.1 or more and less than 1.0, and the electric field strength is 5000 [V] for a dry object having a dielectric loss tangent tan δ of 0.01 or more and less than 0.1. The electric field intensity is controlled to a value of 9000 [V / m] or less for a dry object having a value of V / m] or less and a dielectric loss tangent tan δ of 0.001 or more and less than 0.01.

  According to the invention of claim 1, the upper limit value of the power of the microwave oscillated from the magnetron is determined according to the value of the dielectric loss tangent tan δ of the dry object, and continuously driven within the limited range, Control different from the conventional magnetron control method of a microwave oven can be performed. According to this, when drying clothes using microwaves, dry objects made of different types of materials are not burned or melted, and for example, due to heat generated by buttons or metal fittings on the clothes. It is possible to efficiently and accurately dry an object to be dried such as clothing without causing damage and without causing an ignition phenomenon.

  Furthermore, according to this drying method, the electric field strength due to microwaves is restricted according to the category to which various materials belong to prevent breakage and ignition, so that not only drying clothes, It can be used in the field of drying (or removing moisture) for all kinds of materials such as tableware, vegetables, grains, fresh flowers, marine products, garbage, wood paper, etc. It can be expected to be used as a method. In addition, it is environmentally friendly compared to the heater heat source system such as oil and gas, and the drying efficiency can be shortened, so that the work efficiency and power saving / energy saving are great.

According to the second aspect of the present invention, the microwave power output range of the magnetron is limited to the range of the electric field strength value calculated from the relative dielectric constant ε _s and the dielectric loss tangent tan δ, and the magnetron is continuously driven within the limited range. Therefore, it is possible to efficiently and accurately dry an object to be dried such as clothing.

  According to the invention of claim 3, the upper limit value of the power of the microwave oscillated from the magnetron is determined according to the value of the dielectric loss tangent tan δ of the dry object, and continuously driven within the limited range, Control different from the conventional magnetron control method of a microwave oven can be performed. According to this, when drying clothes using microwaves, dry objects made of different types of materials are not burned or melted, and for example, due to heat generated by buttons or metal fittings on the clothes. It is possible to efficiently and accurately dry an object to be dried such as clothing without causing damage and without causing an ignition phenomenon.

  According to the drying method of the fourth aspect, when the drying operation is performed by irradiating the microwave in a state where the moisture of the drying object is extremely reduced, the drying object is forcedly circulated by cooling air. It is possible to control the temperature so as not to exceed a certain temperature, for example, 150 degrees Celsius. Therefore, it is possible to prevent the drying target from suddenly rising in temperature at the time when the water content is extremely low or close thereto and causing damage.

Further, according to the drying apparatus of the fifth aspect, the microwave power output range of the magnetron is limited to the range of the electric field strength value determined from the relative dielectric constant ε _s and the dielectric loss tangent tan δ, and continuous within the limited range. When drying clothes using microwaves, it does not burn or melt dry objects made of different types of materials. For example, buttons and fittings on clothes Thus, it is possible to efficiently and accurately dry an object to be dried such as clothing without causing damage due to heat generation or the like and without causing an ignition phenomenon.

  Furthermore, according to this drying device, the electric field strength due to microwaves is restricted according to the category to which various materials belong to prevent breakage and ignition. It can be used in the field of drying (or removing moisture) for all kinds of materials such as tableware, vegetables, grains, fresh flowers, marine products, garbage, wood paper, etc. Can be expected. In addition, it is environmentally friendly compared to the heater heat source system such as oil and gas, and the drying efficiency can be shortened, so that the work efficiency and power saving / energy saving are great.

  Hereinafter, the configuration of the present invention will be described in detail based on embodiments shown in the drawings.

  1 to 15 show an embodiment of the present invention. The present invention irradiates an object to be dried with microwaves oscillated from a magnetron and dries the object to be dried using dielectric heating. In this case, the power of the microwaves oscillated from the magnetron is used. The electric field strength is 1500 [V / m] or less for a dry object having a dielectric loss tangent tan δ of 0.1 or more and less than 1.0, and the electric field strength is 5000 for a dry object having a dielectric loss tangent tan δ of 0.01 or more and less than 0.1. The electric field strength is controlled to a value of 9000 [V / m] or less for a dry object having a value of [V / m] or less and a dielectric loss tangent tan δ of 0.001 or more and less than 0.01. In the following, a cartridge 3 for inserting an object to be dried, which can be attached to and detached from the drying chamber, is inserted into the turntable 6 and dried by microwaves emitted from a magnetron (microwave oscillator) while rotating the cartridge 3 and the turntable 6. A dryer (drying apparatus) employing the method will be described. A dryer (drying device) described below is a device that is suitable particularly when clothing or the like is a drying object.

  The dryer of the present embodiment that performs drying processing of an object to be dried using microwaves can efficiently perform drying processing to generate heat from the inside by irradiating microwaves. Moreover, there is an advantage that the inside of the object to be dried can be uniformly dried. In addition to these, in the present embodiment, the cartridge 3 detachably attached to the turntable 6 and the turntable 6 are rotated at an arbitrary number of rotations in the drying chamber container 1 in a high-temperature drying state to forcibly dry air. 3, the drying time of the object is shortened by adopting a structure in which more contact area between the dry object and the dry air accommodated in the cartridge 3 is secured.

  In this case, the dryer preferably includes one or more, preferably two or more, removable cartridges 3 having a dehydrating function from the viewpoint of improving the drying efficiency. In the present embodiment, a structure in which an object to be dried is put in the cartridge 3 and inserted into the turntable 6 in the drying chamber is adopted, and a cloth fabric such as clothing as the object to be dried is not easily entangled. For example, in the present embodiment, six cartridges 3 are arranged at equal intervals on a disk-shaped turntable 6 provided vertically, and are rotatably attached so as to rotate while revolving around the axis of the turntable 6. (See FIG. 1 etc.). Both the rotation axis of the turntable 6 and the rotation axis of each cartridge 3 are horizontal.

  As described above, the turntable 6 to which the cartridge 3 can be attached and detached is connected to the turntable drive motor 11 via the gear gear 8 and the core rotating shaft 9a installed in the drying chamber, the coupling 10 installed outside the drying chamber, and the like. (Refer to FIG. 3 etc.). When the turntable drive motor 11 is driven, the gear gear 8 rotates. When the gear gear 8 rotates, the rotational force is transmitted to the teeth provided on the outer periphery of the turntable 6, and the turntable 6 moves around the outer periphery of the air duct 12. Rotates while sliding.

  Further, each cartridge 3 on the turntable 6 is rotated by transmitting rotational power as follows (see FIG. 3 and the like). That is, a coaxial rotating shaft 7 is installed on the outer periphery of the air duct 12, and a pulley 7c is fixed to the coaxial rotating shaft 7. The rotational power of the cartridge motor 7f is applied to the cartridge motor pulley 7e and the timing belt 7d. Via the pulley 7c. Then, power is transmitted from the pulley 7c to the pulley 7a fixed on the same shaft, the pulley 6g of the turntable 6 rotates via the timing belt 7b (see FIG. 5), and the rotating shaft 6d rotates. Is transmitted to the pulley 6c. The pulley 6c provided corresponding to each cartridge 3 is rotated by the timing belt 6e and transmitted to the cartridge rotation shaft 3b inserted into the rotation shafts 6b and 6d, whereby the cartridge 3 rotates.

  The air duct 12 is fixed to the main body, and is fitted into the outer periphery of the air duct 12 so as to cover the turntable air duct 6h (see FIG. 7). Thereby, the air duct 12 and the turntable air duct 6h are joined and integrated. The turntable 6 has a structure that rotates while sliding on the outer peripheral surface of the air duct 12.

  The blower fan 13 is attached to the lower end side of the rotating shaft of the blower exhaust fan motor 14, and the exhaust fan 16 is attached to the upper end side (see FIG. 3). Air generated in an electrical part (a room in which a control board for controlling the machine, a magnetron-driven high-voltage transformer and an inverter power supply is installed) is blown to the blower duct 12 connected to the blower fan 13 and to the turntable. The air passes through the duct 6h, passes through the suction duct 2c of the drying chamber container opening / closing door 2, and is sent to the inside of the drying chamber container opening / closing door 2. The air sent to the inside of the drying chamber container opening / closing door 2 is sucked into the dry product insertion hole 3e of the cartridge 3 from the cartridge air supply hole 2f and discharged to the drying chamber container 1 from the dehydration hole 3d (FIG. 8, FIG. 9, see FIG.

  The lid 2a of the drying chamber container opening / closing door 2 is detachable, and is pressed by the lid crimping spring 2e to slide and rotate on the lid guide frame 2d (see FIGS. 2 and 3). The lid guide frame 2d has a concave groove facing the center direction of the lid 2a, and the lid 2a rotates while sliding the outer peripheral portion of the lid into the concave groove. Further, the lid 2a has cartridge air supply holes 2f having the same number of holes as the number of cartridges 3 mounted on the turntable 6 inside the drying chamber container 1 and corresponding to the positions of the cartridges 3. . The hole diameter of the cartridge air supply hole 2 f is the same as the outer diameter of the cartridge 3. In addition, when the drying chamber container opening / closing door 2 is closed, the suction duct engagement claw 2b formed in the suction duct 2c of the lid 2a is formed in the intake duct 6h of the turntable 6 by being pushed by the lid pressure spring 2e. The suction duct occlusion claw 6j is engaged with each other. The drying chamber container opening / closing door 2 is provided with a cartridge window 2k corresponding to each cartridge 3 (see FIG. 1).

  The packing 2j of the drying chamber container opening / closing door 2 serves to make the drying chamber container 1 a decompression chamber when the door is closed. The choke 2i is equipped with a structure that does not allow microwaves to leak from the inside of the drying chamber container 1 to the outside.

  The drying chamber container opening / closing door 2 is provided such that when the handle 2g provided on the front surface of the door 2 is pulled forward, the lock claw 2h is retracted once and is removed from the door lock hole 24 (see FIG. 2). The drying chamber container opening / closing door 2 of the present embodiment is attached so that it can be opened 90 degrees or more. When the drying chamber container opening / closing door 2 is closed, if the handle 2g is pushed, the lock claw 2h is pushed into the door lock hole 24 and automatically retracted to be inserted into the door lock hole 24. It has become. The drying chamber container 1 is sealed by the drying chamber container opening / closing door 2 thus closed.

  As described above, the cartridge 3 of the present embodiment itself rotates (rotates) around each rotation shaft 6b. Further, fins 3a (see FIG. 8) provided around the cartridge 3 forcibly exhaust the air inside the cartridge 3 into the drying chamber container 1 when the cartridge 3 rotates. Further, when the cartridge 3 rotates, the moisture of the dried object is discharged from the dewatering hole 3d by the centrifugal force.

  The air in the drying chamber container 1 is discharged outside the apparatus through the exhaust duct 15, the exhaust fan 16, and the exhaust duct 17. In the present embodiment, the negative ion generator 29 simultaneously discharges air having an atmosphere of negative ions.

  In the present embodiment, the intake on / off valve 30 mounted on the air duct 12 is opened and closed by the intake on / off valve drive unit 31. If the intake opening / closing valve 30 is closed during the drying operation, the inside of the drying chamber container 1 can be decompressed to 1 atm or less.

  The magnetron 22 is installed so that the microwave generated by the magnetron 22 is irradiated to a predetermined position in the drying chamber container 1 through the waveguide 22a (see FIG. 3 and the like). In addition, the electric field intensity sensor 28 that measures the rate of absorption of microwaves into the dry object and the microwave power to be controlled to the optimum power according to the characteristics or properties of the dry object such as material are not shown. A magnetron control device is also provided, and the electric field strength sensor 28 and the magnetron control device determine the microwave power according to the material of the object to be dried, and control the magnetron power source 23 so as to obtain the optimum power. It can be adjusted.

  The drying operation in the present embodiment will be specifically described. First, the humidity sensor 18 in the drying chamber container 1 measures the moisture content of the drying object inside the cartridge 3 adjacent to the irradiation port of the magnetron 22. Next, after calculating the time during which the cartridge 3 stays in the vicinity of the irradiation port of the magnetron 22, the turntable 6 on which the cartridge 3 is inserted is stopped for the calculated time and irradiated with microwaves. At this time, the temperature of the object to be dried is measured by the temperature sensor 19 in the drying chamber container 1 and the electric power is optimized by the electric field strength sensor 28 to adjust the microwave irradiation power so that the temperature does not rise excessively. . Further, when the moisture content of the object to be dried is large, it is possible to perform an efficient drying operation by taking a longer stop time of the turntable 6 and shortening the stop time when the moisture content decreases. Furthermore, it is also preferable to make the drying operation more efficient by increasing the rotational speed of the cartridge 3 when the amount of water is large, and lowering the rotational speed when the amount of water is small. When the humidity sensor 18 and the temperature sensor 19 detect that the object to be dried inside the cartridge 3 has reached a predetermined drying state, the intake opening / closing valve 30 is opened, and the drying operation under reduced pressure is started from the atmospheric pressure. By switching to drying, a more efficient drying operation can be performed.

  Next, FIG. 15 shows the relationship of the microwave irradiation power in the progress of the drying operation with the vertical axis representing the humidity axis and the horizontal axis representing the time axis, and the control method of the microwave power unit in the drying process will be described. At time t1, the humidity rise and fall change is calculated by drying at high speed up to a predetermined humidity with the microwave power maximized, and based on this, the switching time a (the rotation speed of the cartridge 3 is switched and the microwave irradiation is performed). The time from the pause to the start of irradiation is calculated. In t2 time, the microwave of arbitrary microwave electric power is irradiated. In t3 time, the microwave of arbitrary microwave power is irradiated for irradiation time t3 (t3 <t2). In t4 time, the microwave of arbitrary microwave electric power is irradiated only for irradiation time t4 (t4 <t3). After a time, a microwave having an arbitrary microwave power is irradiated for a short time for an irradiation time t5 (for example, in the present embodiment, the irradiation time t5 is ½ or less of the irradiation time t4). Repeat intermittent irradiation several times. Thereafter, when the predetermined humidity is reached, the operation is switched to the operation of blowing and drying for time t6 (see FIG. 15). In addition, each time of t2, t3, t4, t5 can be arbitrarily increased / decreased according to a dry state. In addition, the number of irradiations when intermittent irradiation is performed for time t5 can be arbitrarily increased or decreased according to the dry state.

  Further, since the exhausted air has high humidity, in the present embodiment, the air is discharged after the moisture is removed by the cooling device 20 (see FIG. 3 and the like). The water removed by the cooling device 20 is collected in the water tray 21 through the waste liquid pipe 26 (see FIG. 3).

  Subsequently, a second embodiment of the present invention will be described (see FIGS. 16 to 27).

  The drying apparatus using the dielectric heating method in this embodiment has a drying drum 32 that rotates in the drying chamber container 1 like an automatic dryer for home use or business use (see FIG. 17). A drying object storage container 33 is detachably attached to the inner periphery of the drying drum 32 (see FIG. 17). The drying object storage container 33 corresponds to the cartridge 3 in the first embodiment, and has a role of storing the drying object in a state in which the drying object is divided. However, the drying object storage container 33 in the present embodiment does not rotate relative to the cartridge 3 provided so as to rotate (spin), and is merely integrated with the drying drum 32. It is only rotating.

  In the present embodiment, four such dry object storage containers 33 can be attached to and detached from the drying drum 32 (see FIG. 17). In this case, from the viewpoint of performing efficient and unbiased drying, it is preferable that the drying object storage containers 33 are arranged at equal intervals. In the present embodiment, these four drying object storage containers 33 are arranged at regular intervals every 90 degrees on the inner periphery of the drying drum 32 (see FIG. 17).

  Further, the structure for making these dry object storage containers 33 attachable to and detachable from the drying drum 32 is not particularly limited, but in the present embodiment, the individual dry object storage containers 33 are arranged as follows. A structure that can be called a so-called shield structure that holds it in a predetermined position while covering its periphery. That is, the inner periphery of the drying drum 32 is partitioned every 90 degrees by four partition plates 34 attached in the radial direction, and four insertion spaces 36 to which the drying object storage container 33 can be attached and detached are provided (FIG. 17). Etc.). The partition heights of the partition plates 34 are made lower than the drum radius so as to be in close contact with or close to a connection portion 39b of a cooling intake duct 39 to be described later, and each partition plate 34 has a structure independent from each other. (See FIG. 17). A holding plate 35 is further mounted in the partitioned space 36, and the drying object storage container 33 can be taken in and out along the axial direction between the holding plate 35 and the drying drum 32 (see FIG. 20). The holding plate 35 of the present embodiment is a flat surface whose central surface faces the rotation center of the drying drum 32, and the surfaces on both sides of the holding plate 35 are composed of three surfaces that are substantially parallel to the partition plate 34 adjacent to each other. (See FIGS. 17 and 20). However, this is only an example, and the shape of the holding plate 35 can be appropriately changed in accordance with the shape and size of the dry object storage container 33. In addition, a vent hole 35a including a plurality of slits arranged in the direction of the rotation axis is provided on the central surface of the holding plate 35 (see FIG. 20). The vent hole 35a may be formed directly by cutting out a part of the support plate 35. In the present embodiment, the air holes 35a are surrounded by a rectangular frame 35b (see FIGS. 17 and 20). Furthermore, a vent hole 32a is also provided on the outer periphery of the drying drum 32 and on the outer peripheral side of the space 36 thus partitioned (see FIG. 20). Therefore, the air in the drying chamber container 1 can be ventilated from the inside to the outside of the drying drum 32 through the vent holes 32a and 35a or vice versa. Further, a bottom plate 37 that functions as a stopper for the inserted dry object storage container 33 is provided on the back side of the space 36 (see FIGS. 17 and 19). The bottom plate 37 is provided with an air extraction hole 37a composed of a plurality of small holes, for example. Further, a storage container fixing groove 32b into which a part of the drying object storage container 33 is fitted and the drying object storage container 33 are fixed to an inner peripheral surface of the drying drum 32 and an entrance portion of the space 36. A storage container fixing hole 32c is provided (see FIG. 20 and the like).

  The drying object storage container 33 is a so-called drawer-shaped container that is inserted into the space 36 in a state where the drying object is stored in the container. The shape and size of the drying object storage container 33 are not particularly limited, but in this embodiment, the shape and size are just fit in the space 36 (see FIG. 16). In addition, dot-like or slit-like air holes 33a are provided on the front side, the back side, and the drum outer peripheral side when inserted into the space 36. The drum inner peripheral side is opened so that an object to be dried can be taken in and out (see FIG. 16). For example, a door-shaped lid may be provided. In addition, a protrusion having a substantially semicircular cross section, for example, is formed on the surface of the drum outer periphery of the dry object storage container 33 so as to be fitted into the storage container fixing groove 32b. Further, on the front side of the drying object storage container 33, a sliding container fixing projection 33c that can be engaged with the above-described storage container fixing hole 32c, and a protrusion sliding operation section for sliding the container fixing protrusion 33c. 33d is provided (see FIG. 16). The container fixing protrusion 33 c engages with the storage container fixing hole 32 c, thereby preventing the dry object storage container 33 from moving to the front side of the space 36.

  Further, the back surface of the drying drum 32 (the back surface in the insertion direction of the drying object storage container 33) is configured by a circular plate 32d (see FIG. 19). A fixed shaft 32e serving as a rotation shaft of the drying drum 32 is fixed to the center of the circular plate 32 (see FIG. 20). Further, the circular plate 32 is provided with a vent hole 32f composed of a plurality of slits arranged circumferentially around the fixed shaft 32e (see FIG. 20 and the like). Further, an air outlet hole 32g is also provided on the outer peripheral side of the circumferentially arranged vent holes 32f (see FIG. 19). In the present embodiment, four relatively large air extraction holes 32g are arranged at intervals of 90 degrees so as to overlap with the air extraction holes 37a of the bottom plate 37 (see FIG. 19).

  A drive motor 11 that rotates the drying drum 32 and a gear box 38 that houses a gear train that transmits torque from the drive motor 11 to the fixed shaft 32 e are provided on the back side (back side) of the drying chamber container 1. (See FIGS. 18, 19, and 24). When the rotary drum 32 is rotated by the drive motor 11 and the gear box 38, it may be rotated at a constant speed, but it is also preferable to control the rotation using a control circuit or a control device. In such a case, for example, it is possible to perform control such that the drying drum 32 is stopped while each drying object is in the drying process.

  Further, a cooling intake duct 39 is attached inside the drying drum 32 and in front of the fixed shaft 32e (see FIG. 21). The outside air sucked from the vent hole 32f of the drying drum 32 passes through the cooling intake duct 39, passes through the inside of the dry object storage container 33 having a shield structure, and is further sucked into the cooling exhaust box 40. Finally, the air is exhausted from the exhaust fan box 41 to the outside of the apparatus (see FIGS. 18 and 24). An exhaust fan motor 43 provided below the exhaust fan box 41 sends air into the exhaust fan box 41 to generate an exhaust flow (see FIGS. 18 and 24). In FIG. 24, the flow of exhaust from the exhaust fan box 41 is indicated by an arrow and a reference numeral 42 is attached.

  Further, the rotation amount of the exhaust fan motor 43 is preferably controlled by a control circuit. The object to be dried is heated by microwaves to obtain heat, and the amount of heat varies depending on the flow rate of the cooling air flowing in the object to be dried container 33 shielded in the drying drum 32. . Therefore, if the air flow rate can be controlled by the control circuit, it is possible to flexibly respond to the drying process or situation, such as whether the equivalent amount of heat can be taken away or the operation to slow the temperature rise of the drying object is realized. There is an advantage that it becomes possible to do. In controlling the flow rate in this way, the mass of the drying object, the magnitude of the specific heat, the time during which the drying object stays in a place where the electric field is weak and a place where the electric field is strong, and the like become control elements. In performing temperature control by such air flow rate adjustment, for example, in this embodiment, the flow rate adjustment is performed so that the temperature of the object to be dried does not exceed 150 degrees. In the present embodiment, one of the purposes of controlling so as not to exceed 150 degrees is to effectively kill bacteria while preventing the dried object from being burnt, burnt or melted. That is, based on the data that most bacteria die at 140 ° C. or higher, medical equipment sets the standard of sterilization temperature to 140 ° C. Therefore, in this embodiment, the temperature is optimized based on this. For example, when the exhaust fan motor 43 is an AC motor, it is possible to control the rotational speed so that the rotational speed can be selected stepwise or steplessly using a thyristor or a triac element. Further, by avoiding the temperature from becoming 150 ° C. or higher in this way, it is possible to prevent the plastic material from melting even if, for example, a plastic material is used as the drying object storage container 33.

Here, a specific example of air flow rate control will be described. For example, the flow rate of air is assumed to be 400 g and the flow rate is 0.72 m ³ / min. Further, the specific heat of the object to be dried is calculated, the specific heat is converted into a temperature decrease coefficient, and the flow rate is increased in accordance with this coefficient. The flow rate is increased in proportion to the increment of the weight based on the weight 400 g of the object to be dried. If the reference weight varies with the size of the drying chamber capacity of the machine, the air flow rate will also vary. Alternatively, in a space where the electric field is weak, the temperature of the object to be dried is decreased by a temperature difference of 5 ° C. or less from the temperature before entering the space where the electric field is weak (in the range of 140 ° C. to 145 ° C. if 145 ° C.). There is also a specific example in which the rotational speed of 32 is controlled.

  In addition, a place where the electric field is weak and a place where the electric field is strong are provided in the drying chamber container 1 including the drying drum 32, and the object to be dried is moved from a place where the electric field is weak to a place where the electric field is strong. It is also possible to adopt a means of repeating the operation to be performed. In this case, the air flow rate in the place where the electric field is weak is increased to cool the dry object, and when the dry object moves to the place where the electric field is strong and then returns to the place where the electric field is weak, it does not exceed 150 degrees. In order to achieve this, the air flow rate is determined. As a configuration of the space where the electric field is weak, there can be mentioned one utilizing the fact that the microwave generated by the magnetron 22 has a very high oscillation frequency and high straightness (see FIG. 27). In this case, a metal film is formed on a metal plate or a plastic surface having a small dielectric loss tangent (dielectric loss angle) (in FIG. 27, the metal film is denoted by reference numeral 46), and the microwave is reflected there, A weak electric field space can be formed on the back side of the metal film 46 by providing a space that reduces the wraparound of the microwave. For example, in a large-scale drying system, a weak electric field chamber is provided in advance, and an object to be dried is carried into the chamber by a carrier, or microwaves are reflected by a movable shielding plate so that a weak electric field space is provided on the back side of the movable shielding plate. May be provided.

  Moreover, the following can be considered as a method of increasing the air flow rate to the space where the electric field is weak. That is, an exhaust valve is provided separately for the exhaust system in the strong electric field space and the exhaust system in the weak electric field space, and the exhaust valve of the exhaust system in the strong electric field space is fully opened to evaporate the moisture from the dry object. Is measured with a moisture sensor. When the measured value of the moisture sensor during the heating operation is lowered and the exhaust air before heating immediately after the drying operation is measured with the moisture sensor, the weak electric field is below the intermediate value between these measured values. The exhaust valve of the space exhaust system is fully opened, and the exhaust valve of the strong electric field space is switched to fully closed.

In addition, it is thought that it is also possible to set it as 100 degrees or less especially in the case of a dry object with a small loss factor. This is because the moisture evaporates at 100 degrees during drying, the temperature of the object to be dried becomes 100 degrees, but when the moisture decreases, the temperature is below 100 degrees, and this time, heat is generated by the microwave loss factor of the object to be dried, This is in consideration of the actual drying situation in which the temperature becomes 100 degrees or more again after a long time and the temperature rises as time passes. If the loss factor is not taken into consideration, it is difficult to determine whether or not the drying has been completed when the temperature rise characteristic when drying the object is near 100 degrees. Can be judged. The loss factor refers to a value obtained by multiplying the relative dielectric constant ε _s and the dielectric loss tangent tan δ. As a specific example of an object to be dried having a small loss factor, for example, a pellet material obtained by finely crushing a recycled plastic bottle can be used.

  The cooling intake duct 39 is formed in an elongated shape along the rotation axis direction of the drying drum 32 (see FIG. 22). An air hole 39 a for sending cooling air to the drying object storage container 33 is provided, for example, at the bottom portion of the cooling intake duct 39. For example, in the present embodiment, the air holes 39a are constituted by a plurality of slits that are partitioned and formed so as to be sequentially arranged in the longitudinal direction, and further, a partition-like partition 39c is provided between the slits at the exhaust port to thereby control the air direction. The aperture is narrowed down (see FIGS. 22 and 23). The air discharged from the air holes 39a flows into the dry object storage container 33 through the air holes 35a and the air holes 33a. Further, the cooling intake duct 39 is provided with a connection portion 39b for reliably sending the cooling air to the drying object storage container 33 (see FIGS. 22 and 26). That is, when any drying object storage container 33 is positioned in front of the air hole 39a of the cooling intake duct 39 by rotating the drying drum 32 (in other words, any drying object storage container 33 is When the partition plate 34 and the connecting portion 39b are brought into close contact or close to each other, the cooling air flows into the dry object storage container 33 without leakage. Accordingly, the connecting portion 39b is formed in, for example, an arc shape so that when the drying object storage container 33 is positioned in front of the air hole 39a, the connecting portion 39b is in close proximity, preferably in close contact with the adjacent partition plates 34. (See FIG. 26). Furthermore, it is preferable that the conductor portion of the fixed shaft 32e of the rotary drum 32 and the conductor portion of the air hole 39a or the connecting portion 39b of the cooling intake duct 39 are electrically connected by a conductor. In such a case, the rotating drum 32 can be reliably grounded each time the partition plate 34 provided inside the drying drum 32 contacts a part of the cooling intake duct 39. In addition, it is preferable that the vicinity of the opening of the air hole 39a of the cooling intake duct 39 has a size that sufficiently attenuates the frequency of 2.45 GHz (more precisely, 2.455 GHz). This is due to the fact that the oscillation frequency of the magnetron 22 is 2.455 GHz. In addition, a relatively low frequency band is assigned to electromagnetic waves (radio waves) that are internationally agreed and can be used for drying and other similar purposes, and if the frequency is further lowered, the wavelength becomes longer. However, it can be said that a smaller hole diameter is preferable in terms of making the machine compact. From these points, in this embodiment, a hole having a size capable of sufficiently attenuating electromagnetic waves (radio waves) having a frequency of 2.455 GHz is provided. In addition, “sufficiently attenuate” here specifically means to attenuate the microwave power to about 1/10, and more preferably to less than that. In the present embodiment, the hole diameter of the air hole 39a is described above so that the dry object is not affected by the dielectric heating inside the dry object storage container 33 having the shield structure, and a constant air flow rate is ensured. The shape and size are as follows.

  The cooling exhaust box 40 is an exhaust box-like member provided directly below the drying drum 32 (see FIGS. 17 and 18). In the center of the upper portion of the cooling / exhaust box 40, there is provided a suction hole 40a that is hollowed out in an arc shape in accordance with the shape of the drying drum 32 (see FIG. 25). A discharge hole 40b is provided in the back of the cooling exhaust box 40 (see FIG. 25). The air discharged from the discharge hole 40b is sucked into the exhaust duct 44 through the suction hole 44a connected to the rear side thereof, and further exhausted to the outside after passing through the exhaust fan box 41 (FIG. 18). , See FIG.

  Further, a drying chamber exhaust duct 45 communicating with the inside of the drying chamber container 1 is provided on the back side of the drying chamber container 1 (see FIG. 18). The drying chamber exhaust duct 45 is also connected to the exhaust fan box 41 (see FIG. 24). The air in the drying chamber container 1 passes through the drying chamber exhaust duct 45 and the exhaust fan box 41 and is then exhausted to the outside.

  The magnetron 22 and the waveguide 22a are installed on the outside of the drying chamber container 1, for example, on the right side surface (see FIG. 17) so that the object to be dried in the object container 33 can be irradiated with microwaves. . Here, it is preferable to use an inverter power source for the magnetron power source (not shown in the present embodiment). In such a case, unlike a power source composed of a transformer and a capacitor, there is an advantage that the microwave output can be continuously controlled from about several tens of watts. It becomes possible to set the microwave output. In addition, for example, when the partition plate 34 inside the drying drum 32 is made of a metal member, if the magnetron 22 is used in the vicinity of the maximum microwave output, the life is shortened due to matching or the like. From the viewpoint of avoiding the problem, it is preferable to set the microwave output to the maximum set value to the extent that there is no problem in the life. As a specific example, the exhaust temperature and moisture content are measured from the beginning of drying to detect the peak of the exhaust gas temperature rise, and the microwave output is reduced based on the moisture content in the air at this time. If the microwave output value is reset to a place where even a slight decrease in the moisture content can be confirmed, drying can be performed efficiently while avoiding shortening of life. Moreover, since the matching state becomes worse when the metal member in the drying drum 32 moves to the vicinity of the microwave irradiation opening, in order to avoid this, the microwave output is reduced using the magnetron control circuit, and the matching state is reduced. It can be said that it is also preferable to perform a series of operations of returning the microwave output to the original value when the metal member moves to a place where there is no problem.

  The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the scope of the present invention. For example, in the above-described embodiment, a dedicated container (drying object storage container 33) that can be attached and detached to fix the drying object in the drying drum 32 is prepared. It is possible to adopt a method such as a simple structure in which an object to be dried is sandwiched and fixed to a part of the inner periphery.

Further, the description has been made so far on the drying device (drying device) suitable particularly when clothing or the like is the object to be dried. However, the drying method and the drying device according to the present invention are for drying other than clothing such as so-called garbage. It can also be applied to objects. For example, in the case where garbage is used as an object to be dried in this way, the electric field strength value of the microwave power may be set according to the property. Specifically, since the relative permittivity ε _s of garbage is approximately between 50 and 70, the upper limit value of the electric field strength value may be set accordingly. For example, in the present embodiment, for category A (region where the dielectric loss tangent tan δ is 0.1 or more and less than 1), if the relative dielectric constant ε _s is 10 or more and less than 50, the upper limit of the electric field strength is 1000 [V / m], the ratio If the dielectric constant ε _s is 50 or more and 70 or less, the upper limit value of the electric field strength is 900 [V / m], and the dielectric constant ε _s is 10 or more for the section B (region where the dielectric loss tangent tan δ is 0.01 or more and less than 0.1). If it is less than 50, the electric field strength upper limit value is 3000 [V / m], and if the relative dielectric constant ε _s is 50 or more and 70 or less, the electric field strength upper limit value is 2500 [V / m]. In addition, regarding the category C (region where the dielectric loss tangent tan δ is 0.001 or more and less than 0.01), it is considered that the specific material of the garbage in this category is not clear, but this is not so relevant. When the rate ε _s is 10 or more and less than 50, the upper limit value of the electric field strength is 8500 [V / m], and when the relative dielectric constant ε _s is 50 or more and 70 or less, the upper limit value of the electric field strength is 7000 [V / m] ( (See FIG. 29).

  According to the present embodiment, since the magnetron control can be performed in consideration of the reduction rate of the volume of raw garbage, it is possible to avoid the occurrence of poor microwave matching even if the mass or moisture content of the dry object is reduced. In addition, it is possible to prevent the drying container from being deteriorated by sparks generated inside the processing container. According to this, it is possible to obtain the microwave absorption power corresponding to the mass or volume of the object to be dried, and easily dry the garbage by microwave drying. In other words, with regard to the microwave absorbed power, when it exceeds a certain predetermined value, it is not absorbed any more, and no matter how much it is dried with a high power magnetron, the power that is not absorbed returns as reflected waves and is discarded as heat. However, according to the present embodiment in which a power value equal to or lower than the microwave absorption power of the object to be dried (raw garbage) is set, by oscillating the microwave according to this characteristic, the raw garbage with much moisture It is possible to easily and efficiently dry even when the is an object to be dried. Therefore, it can be expected to contribute to the production of a full-fledged machine for drying raw garbage.

It is a front view which shows the structure of the drying apparatus made into the system which puts a drying target object in a detachable cartridge, inserts it on a turntable, and rotates a turntable and a cartridge. It is a front door open state figure of the drying apparatus shown in FIG. It is a side internal view of the drying apparatus shown in FIG. It is a top view which shows the structure of the turntable in this embodiment. It is a side view of the turntable shown in FIG. It is a rear view of the turntable shown in FIG. It is a top view of the turntable shown in FIG. It is a perspective view of the cartridge insertion side in this embodiment. FIG. 9 is a plan view of the cartridge insertion side illustrated in FIG. 8. FIG. 9 is a plan view of a dry object input side of the cartridge shown in FIG. 8. It is a back (?) Figure which shows the inner side of the opening / closing door of the drying chamber in this embodiment. It is a top view which shows the inner side of the opening / closing door of the drying chamber shown in FIG. It is a top view which shows the rotation cover part of the door of the drying chamber shown in FIG. 11, FIG. It is a side view which shows the rotation cover part of the opening / closing door of the drying chamber shown in FIG. It is a graph of the humidity in a dry room, and a microwave electric power value. It is a perspective view which shows the structure of the drying target object storage container in the 2nd Embodiment of this invention. It is a front view of the drying apparatus which shows structures, such as a drying drum. It is a longitudinal cross-sectional view from the right side which shows the internal structure of a drying apparatus. It is a rear view which shows the structure in the back side of a drying drum. It is a perspective view which shows partially the internal structure of a drying drum centering | focusing on the insertion space of a drying target object storage container. It is a perspective view which shows the structure of the attachment part of the cooling air intake duct in a drying drum, and its periphery. It is a perspective view which shows the external appearance of the air intake duct for cooling. It is a perspective view which shows the internal structure of the air intake duct for cooling. Structure behind the drying chamber container in the drying device It is a perspective view which shows the structure of a cooling exhaust box. It is a fragmentary perspective view which shows the shield structure of a drying target object storage container. Increase the air flow rate in a place where the electric field is weak to cool the object to be dried, and then dry the object so that it does not exceed 150 degrees when it moves to a place where the electric field is strong and then returns to the place where the electric field is weak It is a figure which shows the structural example of an apparatus. It is the graph which showed the relationship (f = 2450MHz) with the dielectric constant (epsilon) _{s of a} substance, the dielectric loss tangent (delta), and the penetration depth (electric power half depth m). It is a table | surface which shows an example of the setting value at the time of setting the electric field strength value of microwave electric power according to a division | segmentation and relative dielectric constant (epsilon) _s , when making garbage into a drying target object.

Explanation of symbols

22 Magnetron 28 Electric field strength sensor ε _s Dielectric constant
tanδ Dissipation factor

Claims (5)

  In a method for drying an object to be dried using dielectric heating in which microwaves oscillated from a magnetron are irradiated to an object to be dried such as clothes to perform a drying process, the microwave is responsive to a value of a dielectric loss tangent tanδ of the object to be dried. A method for drying an object to be dried using dielectric heating, wherein a drying process is performed by irradiating a microwave while controlling the power value within a range of the power upper limit value . The absorption power of the microwave is P [W], the microwave frequency is f [Hz], the relative permittivity of the dry object is ε _s , the volume of the dry object is Q [m ³ ], and the electric field strength is E In the case of [V / m], the formula P = 2πf · ε ₀ · ε _s · Q · E ² · tan δ
The method for drying an object to be dried using dielectric heating according to claim 1, further comprising: calculating an absorption power of the microwave to determine an upper limit value.   The electric power of the microwave oscillated from the magnetron is a value of 1500 [V / m] or less for a dry object having a dielectric loss tangent tan δ of 0.1 or more and less than 1.0, and a dielectric loss tangent tan δ of 0.01 or more and less than 0.1. The electric field strength is controlled to a value of 5000 [V / m] or less for a dry object, and the electric field strength is controlled to a value of 9000 [V / m] or less for a dry object having a dielectric loss tangent tan δ of 0.001 or more and less than 0.01. The method for drying an object to be dried using dielectric heating according to claim 2, wherein the object to be dried is subjected to a drying process by irradiating the object to be dried with the power-controlled microwave.   The cooling air in the drying chamber container is forcibly circulated when the drying process is continued in a state where the moisture of the drying object is 10% or less of the mass of the drying object. 4. A method for drying an object to be dried using dielectric heating according to any one of 3 above. In a drying apparatus for drying objects using dielectric heating in which a drying object such as clothing is irradiated with microwaves oscillated from a magnetron to dry the object, the microwaves oscillated from the magnetron are absorbed by the drying object. An electric field intensity sensor for measuring the ratio, and a magnetron control device for controlling the power of the microwave according to the characteristics or properties of the object to be dried, the magnetron control device having a dielectric loss tangent tanδ of 0.1 or more The electric field strength is a value of 1500 [V / m] or less for a dry object less than 1.0, and the electric field strength is 5000 [V / m] or less for a dry object having a dielectric loss tangent tan δ of 0.01 or more and less than 0.1. The value of the dielectric loss tangent tan δ is 0.001 or more and less than 0.01, and the electric field strength is controlled to a value of 9000 [V / m] or less. Dry clothes Place.

Images