CN220321787U

CN220321787U - Microwave hot air coupling drying device and ceramic body drying box

Info

Publication number: CN220321787U
Application number: CN202321893163.8U
Authority: CN
Inventors: 彭虎; 夏广斌; 刘忠; 倪胜军
Original assignee: Hunan Yuanchuang High Tech Industrial Technology Co ltd
Current assignee: Hunan Yuanchuang High Tech Industrial Technology Co ltd
Priority date: 2023-07-19
Filing date: 2023-07-19
Publication date: 2024-01-09
Anticipated expiration: 2033-07-19

Abstract

The application provides a microwave hot air coupling drying device and a ceramic body drying box, and relates to the field of microwave application. The microwave hot air coupling drying comprises the following steps: the drying cavity is provided with an air inlet hole and a wet air suction through hole on the cavity wall; a microwave source mechanism configured to generate microwaves; a hot air fan; a dehumidifying fan; a heating assembly in the flow path of the gas; the heating assembly includes a shield and a heating element in the shield; the shielding cover is provided with a plurality of ventilation heating holes for the gas to pass through, and the aperture of the ventilation heating holes is smaller than one quarter wavelength of the microwaves. The microwave hot air coupling drying device can dry materials and avoid the ignition effect.

Description

Microwave hot air coupling drying device and ceramic body drying box

Technical Field

The application relates to the field of microwave application, in particular to a microwave hot air coupling drying device and a ceramic body drying box.

Background

The microwave heating effect is a thermal effect based on absorption of microwaves by a substance. In the technical application of microwave heating, water is the most common medium material, and because the water has a huge dielectric constant and has a good microwave absorption effect, the microwave can be utilized to dry materials, and the moisture in the materials can be oozed out or led out from the materials after reaching the evaporating temperature after absorbing the microwave energy. And the microwave heating is to heat the material to be heated inside and outside simultaneously, so that the heating temperature can be reached in a very short time despite the material with poor heat conductivity.

Current microwave drying equipment typically places the material in a drying chamber made of metal and then places a microwave head to feed microwaves into the drying chamber. The microwaves are reflected on the metal inner wall surface of the drying chamber and are enclosed into the drying chamber to dry the material in the drying chamber.

The microwave heating is to make the heated material become a heating body, that is, the temperature of the material is higher than the temperature of air in the drying cavity in the microwave heating process, if the temperature of the material is too high relative to the temperature of the air, the moisture in the material migrates to the outside too fast, and the moisture on the surface of the material is not evaporated, so that the material is cracked and deformed.

Disclosure of Invention

For overcoming the not enough among the prior art, this application provides a microwave hot air coupling drying device, includes:

the drying cavity is provided with an air inlet hole and a wet air suction through hole on the cavity wall;

a microwave source mechanism configured to generate microwaves, a microwave feed-out port of the microwave source mechanism being located within the drying chamber;

a hot air fan configured to drive the gas in the drying chamber to flow;

a dehumidifying fan disposed opposite to the dehumidifying air passage and configured to suck out the moist air in the drying chamber;

a heating assembly in the flow path of the gas; the heating assembly includes a shield and a heating element in the shield; the heating piece is configured to heat gas, a plurality of ventilation heating holes for the gas to pass through are formed in the shielding cover, and the aperture of each ventilation heating hole is smaller than one quarter wavelength of microwaves.

In one possible implementation manner, the microwave hot air coupling drying device further comprises an air cavity, wherein the air cavity and the drying cavity are independent from each other, and the air cavity is communicated with the drying cavity through a plurality of circulating air through holes; wherein the circulating air through holes are configured to allow gas in the drying chamber to leave the air chamber through one part of the circulating air through holes and reenter the drying chamber through another part of the circulating air through holes.

In one possible embodiment, the plurality of circulating air through holes include a plurality of circulating air inlet holes and a plurality of circulating air outlet holes, the circulating air inlet holes are used for allowing air to flow into the drying cavity, and the circulating air inlet holes are at least formed by one of the following ways:

mode one: the distance between two adjacent circulating air inlet holes is gradually reduced from one side close to the hot air fan to one side far away from the hot air fan;

mode two: the drying cavity is from one side close to the hot air fan to one side far away from the hot air fan, and the areas of two adjacent circulating air inlet holes are gradually increased.

In one possible embodiment, the apertures of the air inlet, the moisture extraction and the circulating air through holes are all smaller than a quarter wavelength of the microwaves.

In one possible embodiment, the circulation fan is disposed opposite to the circulation wind through hole and configured to pass gas through the circulation wind through hole.

In one possible embodiment, the heating element, the hot air fan and the dehumidifying fan are all located outside the drying chamber.

In one possible embodiment, the microwave hot air coupled drying device further includes:

a humidity sensor configured to detect humidity of the gas in the drying chamber;

and the control module is electrically connected with the humidity sensor and the dehumidifying fan through an electrical control circuit.

a first temperature sensor configured to detect a surface temperature of a material to be dried in the drying chamber;

a second temperature sensor configured to detect a temperature of gas within the drying chamber;

and the temperature control module is electrically connected with the heating piece, the first temperature sensor and the second temperature sensor.

In one possible implementation mode, a plurality of material trays which are arranged at intervals are arranged in the drying cavity in a layering mode, and air guide through holes or air guide gaps are formed in the material trays.

The application also provides a ceramic body drying box, which comprises the microwave hot air coupling drying device.

Compared with the prior art, the beneficial effect of this application:

1. the heating piece is arranged to heat the gas so as to reduce the temperature difference between the temperature of the material and the temperature of the air in the drying cavity, and the heated air can accelerate the evaporation rate of the moisture on the surface of the material when passing through the material, so that the external migration rate of the moisture in the material is close to the evaporation rate of the moisture on the surface of the material, and the probability of cracking and deformation in the material is reduced;

2. through setting up the shield cover that seals the heating piece to set up the ventilation heating hole that the aperture is less than microwave quarter wavelength on the shield cover, make the gaseous both flowing through the heating piece and heated, can inject the microwave outside the shield cover again, prevent that the heating piece from producing the phenomenon of striking sparks.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 shows a front view of a microwave hot air coupled drying apparatus;

FIG. 2 shows a front cross-sectional view of a microwave hot air coupled drying apparatus;

FIG. 3 shows a schematic flow diagram of the circulating gas flow in the outer chamber;

FIG. 4 shows a side cross-sectional view of a microwave hot air coupled drying apparatus;

fig. 5 shows a schematic structural view of the bin gate.

Description of main reference numerals:

100-an outer cavity; 110-a drying chamber; 111-an air inlet hole; 112-circulating air through holes; 113-a moisture extraction through hole; 120-wind chamber; 130-a first device lumen; 140-a second device lumen; 200-a hot air fan; 300-a dehumidifying fan; 400-a microwave source mechanism; 410-a microwave source; 420-slot antenna; 430-a waveguide; 500-a control module; 600-heating assembly; 610-heating element; 620-shielding case; 700-bin gate; 710-choke groove; 720-visual window; 800-material trays; 900-a heat-reducing fan.

Detailed Description

Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc. indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In this application, unless specifically stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.

In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

Example 1

The embodiment provides a microwave hot air coupling drying device which is used for drying materials. Referring to fig. 3 and 4, the microwave hot air coupled drying apparatus includes an outer cavity 100 and a drying cavity 110 covered by the outer cavity 100, and an air cavity 120 is defined between an inner wall of the outer cavity 100 and an outer wall of the drying cavity 110. The microwave hot air coupling drying device is also provided with a microwave source mechanism 400, a hot air fan 200, a dehumidifying fan 300 and a heating assembly 600.

Referring to fig. 3, in some embodiments, the outer cavity 100 and the drying cavity 110 share a part of the structure, and the partition board is disposed in the outer cavity 100 to define the drying cavity 110, so that the material cost for forming the structure of the drying cavity 110 is saved because the part of the structure surrounding the drying cavity 110 and the part of the structure surrounding the outer cavity 100 belong to the same structure. In addition, the first device chamber 130 and the second device chamber 140 are defined in the outer chamber 100 by a partition plate, and the first device chamber 130 and the second device chamber 140 also share a partial enclosure structure with the outer chamber 100. The first equipment chamber 130 and the second equipment chamber 140 are used to mount control electronics, power supplies, microwave sources 410, and the like. There is a space between the first equipment chamber 130, the second equipment chamber 140 and the drying chamber 110, which space defines the air chamber 120, and the air chamber 120 provides a convoluted air duct for the air flow inside the device.

The drying chamber 110 is a region where the material is placed and dried. Specifically, the drying chamber 110 is a metal chamber, and the inner wall of the drying chamber 110 is a smooth metal inner wall to enclose and reflect the microwaves fed into the metal chamber. An air inlet 111 and a wet air suction 113 are provided in the drying chamber 110.

The microwave source mechanism 400 is configured to input microwaves into the drying chamber 110; the microwave source mechanism 400 includes a microwave source 410 for emitting microwaves, a waveguide 430, and a slot antenna 420. Preferably, the microwave source 410 is located in the second equipment chamber 140 to prevent contamination of the microwave source 410 by material in the drying chamber 110; one end of the waveguide 430 extends into the second equipment chamber 140 and is communicated with the feed-out port of the microwave source 410, the other end of the waveguide is communicated with the crack antenna 420 positioned in the drying chamber 110, and a plurality of cracks extending into the drying chamber 110 from the crack antenna 420 serve as the microwave feed-out port of the microwave source mechanism 400.

The air inlet 111 communicates the interior of the drying chamber 110 with the outside air, and the air inlet 111 is used for introducing the outside air to be fed into the drying chamber 110. Referring to fig. 3, in some embodiments, the air inlet holes 111 have two rows, one row of air inlet holes 111 is located on the partition between the first equipment chamber 130 and the air chamber 120, and the other row of air inlet holes 111 is located on the partition between the air chamber 120 and the drying chamber 110. The flow path of the external air into the drying chamber 110 is the first equipment chamber 130→the wind chamber 120→the drying chamber 110.

The dehumidifying fan 300 is disposed adjacent to the dehumidifying through-hole 113, and is used to suck out the moist air in the drying chamber 110 and to form a negative pressure in the drying chamber 110. Specifically, the moisture extraction through-hole 113 communicates the interior of the drying chamber 110 with the outside atmosphere. The inside air of the drying chamber 110 is drawn out to the outside through the moisture drawing through hole 113, so that the inside air pressure of the drying chamber 110 is reduced, and the outside air is supplemented into the drying chamber 110 through the air inlet hole 111 under the action of the atmospheric pressure.

The hot air fan 200 is used for driving the air in the drying chamber 110 to flow. Here, the microwave heating is to make the heated material itself become a heating element, that is, the temperature of the material is higher than the temperature of the air in the drying chamber 110 during the microwave heating, so that the temperature field in the drying chamber 110 is unbalanced. By arranging the hot air fan 200 to balance the temperature field in the drying cavity 110, the air flow can accelerate the heat exchange between the material and the air in the drying cavity 110, so that the evaporation of the moisture in the material is accelerated.

Referring to fig. 4, a heating assembly 600 is in the flow path of the gas. The heating assembly 600 includes a shield 620 and a heating element 610 within the shield 620. Specifically, the heating element 610 may be an electrothermal tube, and the electrothermal tube can heat the air flow to form hot air, so that the hot air is helpful to evaporate moisture on the surface of the material to be dried when flowing through the material to be dried, and the microwaves are easy to migrate the moisture inside the material to be dried outwards. Therefore, the hot air drying mode and the microwave drying mode can balance the internal and external dehydration speeds of the materials.

The shielding cover 620 is provided with a plurality of ventilation heating holes through which the gas passes. It should be noted that, when the heating element 610 is exposed to the microwave environment, a fire striking phenomenon may occur due to a potential difference between the locations of the heating element 610, which may cause a certain safety hazard. In this application, the heating element 610 is disposed in the shielding cover 620, and a plurality of ventilation heating holes through which the gas passes are formed in the shielding cover 620, and the aperture of the ventilation heating holes is smaller than one quarter wavelength of the microwaves. This allows the air flow to pass through the ventilation heating hole and flow through the heating element 610 to be heated, and also allows the microwaves to be confined outside the shielding case 620, thereby preventing the heating element 610 from generating a spark phenomenon.

The present apparatus provides a means of microwave and hot air coupled drying of the material, but it will be appreciated that in some embodiments microwave drying and hot air drying may be performed separately.

In some embodiments, the microwave-hot air coupled drying apparatus further includes a humidity sensor (not shown in the drawings) and a control module 500, the humidity sensor is used for detecting the humidity of the air in the drying cavity 110, and the control module 500 is electrically connected to the humidity sensor, the hot air fan 200, and the moisture-extracting fan 300 through electrical control lines. The moisture of the material in the drying chamber 110 evaporates and diverges into the air in the drying chamber 110, and when the humidity sensor detects that the air humidity in the drying chamber 110 reaches a certain value, an electrical signal is sent to the control module 500, the control module 500 stops the rotation of the hot air fan 200, and the moisture extraction fan 300 is controlled to be started, so that the air in the drying chamber 110 is extracted. Specifically, the control module 500 may be a relay control module 500, or an MCU-based control module 500, where the MCU is a single-chip microcomputer, a PLC, an ARM processor, or a DSP.

In some embodiments, the microwave hot air coupled drying apparatus further comprises a temperature control module, a first temperature sensor, and a second temperature sensor. The first temperature sensor is configured to detect a surface temperature of the material to be dried in the drying chamber 110. The second temperature sensor is configured to detect a temperature of the gas within the drying chamber 110. The temperature control module is electrically connected with the heating element 610, the first temperature sensor and the second temperature sensor to receive temperature information detected by the first temperature sensor and the second temperature sensor, and adjust heating power of the heating element 610 to maintain the surface temperature and the gas temperature of the material to be dried within a certain temperature difference.

In some embodiments, the independent air chambers 120 are communicated with the drying chamber 110 through a plurality of circulating air through holes 112; wherein the circulation wind through holes 112 are configured to allow the gas in the drying chamber 110 to enter the wind chamber 120 through one part of the circulation wind through holes 112 and to re-enter the drying chamber 110 through another part of the circulation wind through holes 112.

Referring to fig. 3, the arrow direction in the figure is the gas flow direction. In some embodiments, the circulating air through holes 112 have two rows, and the two rows of circulating air through holes 112 are disposed on opposite sides of the drying chamber 110, so that the circulating air can flow through the drying chamber 110 more fully. In some preferred embodiments, the hot wind fan 200 is disposed proximate to the circulating wind through hole 112, and drives the air in the outer chamber 100 to flow between the drying chamber 110 and the wind chamber 120 through the circulating wind through hole 112, and forms a circulating air flow. Specifically, the hot air fan 200 is single, the side of the hot air fan 200 close to the air cavity 120 is positive pressure, and the side of the hot air fan 200 close to the drying cavity 110 forms negative pressure, so that the air in the drying cavity 110 is driven to enter the air cavity 120. In other embodiments, the positive and negative pressure directions of the hot wind fan 200 may be opposite to the arrangement direction of the hot wind fan 200 in some embodiments, and the number of the hot wind fans 200 may be plural.

In some embodiments, the heating member 610, the hot wind fan 200, and the dehumidifying fan 300 are all located outside the drying chamber 110 to prevent the ignition thereof due to the exposure to the microwave environment inside the drying chamber 110. The aperture of the circulation wind through-hole 112 is smaller than a quarter wavelength of the microwaves to prevent the microwaves in the drying chamber 110 from leaking out of the circulation wind through-hole 112.

In some preferred embodiments, the aperture of the air inlet 111 and the moisture extraction air passage 113 is also smaller than a quarter wavelength of the microwaves to avoid leakage of the microwaves in the drying chamber 110 from the air inlet 111 or the moisture extraction air passage 113.

Referring to fig. 3 and 4, in some embodiments, the plurality of circulating air through holes 112 includes a plurality of circulating air inlet holes for inputting circulating air into the drying chamber 110 and a plurality of circulating air outlet holes for inputting circulating air into the air chamber 120.

The circulating air inlet is arranged at least by one of the following modes:

mode one: the distance between the adjacent two circulating air inlet holes is gradually reduced from the side close to the hot air fan 200 to the side far from the hot air fan 200 of the drying chamber 110. The more the air volume is near the hot air fan 200, the more the circulating air inlet holes are opened on the side far from the hot air fan 200, so that the air flow rate of the circulating air inlet holes at all positions is close.

Mode two: the areas of the adjacent two circulating air inlet holes are gradually increased from the side close to the hot air fan 200 to the side far from the hot air fan 200 in the drying chamber 110 so that the air flow amount introduced from the circulating air outlet holes at all positions is close.

In some embodiments, a plurality of material trays 800 are arranged at intervals in the drying cavity 110, and air guide through holes or air guide slits are arranged on the material trays 800. Preferably, the air guide through holes or the air guide slits are provided along the flow direction of the circulating air flow. Through the above arrangement, the circulating air flow can flow through the material tray 800 to the positions of the drying cavity 110, and the temperature field equalization is further promoted.

In some embodiments, a plurality of material trays 800 are arranged in a laminated manner in the drying chamber 110, and the stacking direction of the material trays 800 is adapted to the opening direction of the slit antenna 420. As shown in fig. 2, a plurality of trays 800 are horizontally stacked, and the slits of the slit antenna 420 radiate microwaves in a horizontal direction, so that the material to be dried stacked on the trays 800 is exposed to the direct radiation area of the slit antenna 420 as much as possible.

In some embodiments, the walls of the outer chamber 100 are provided with a thermal insulating interlayer, which provides thermal insulation and reduces heat dissipation within the outer chamber 100, since the air within the thermal insulating interlayer is substantially non-flowing.

In some embodiments, a cooling fan 900 is further disposed in the first device cavity 130 and/or the second device cavity 140, where the cooling fan 900 is used to cool the control electric device, the power supply, and the microwave source 410.

In some embodiments, a metal rod is rotatably inserted in the waveguide 430 or the slit antenna 420, and an adjustment end of the metal rod is disposed toward the door 700 of the drying chamber 110. The metal rod here corresponds to an adjustable reactance element, and by varying the depth of insertion of the metal rod into the waveguide 430 or the slot antenna 420, the reactance of the metal rod, and thus the power of the microwave fed out by the slot antenna 420, is varied. Specifically, the metal rod is a bolt and is screwed into the side wall of the waveguide 430 or the slit antenna 420, and the adjusting end of the metal rod is a bolt head and is disposed towards the door 700, so that a user can adjust the screwing depth of the metal rod after opening the door 700.

Referring to fig. 5, in some embodiments, a door 700 that can be opened and closed is provided on the drying chamber 110, a choke groove 710 is provided around the junction between the door 700 and the drying chamber 110, the width of the choke groove 710 is adapted to the wavelength of the microwave fed from the microwave source 410, a high impedance region is formed, and sealing rubber strips are filled in the choke groove 710. The choke groove 710 has a function of guiding the reverse phase of the microwave, and the microwave diffused toward the door 700 at the entrance of the choke groove 710 is offset by the reflected wave reversely thereto, thereby closing the slit at the door 700. The sealing rubber strip is made of high-temperature-resistant silica gel mixed with magnetic powder or graphite, and can prevent materials in the drying cavity 110 from polluting the choke groove 710 on one hand and absorb trace microwave radiation more completely on the other hand.

Referring to fig. 1 and 5, in some embodiments, the door 700 is further provided with a viewing window 720 to facilitate the observation of the drying condition of the materials.

The specific working principle of the device is as follows:

microwave source mechanism 400 feeds microwaves into drying chamber 110; the hot air fan 200 is activated to form a circulating air flow between the drying chamber 110 and the air chamber 120, and the heating member 610 heats the circulating air flow to raise the temperature of the circulating air flow. The heated circulating air flow is coupled with microwave heating to accelerate the evaporation of moisture from the material in the drying chamber 110 and to reduce the temperature difference between the material and the air in the drying chamber 110.

After a period of time, the control module 500 stops the rotation of the hot air fan 200 and controls the start of the dehumidifying fan 300 to suck out the moist air in the drying chamber 110, and simultaneously, the outside air is supplemented into the drying chamber 110 through the air inlet 111 under the action of the atmospheric pressure due to the decrease of the internal air pressure of the drying chamber 110.

Example two

The embodiment provides a ceramic body drying box, which comprises the microwave hot air coupling drying device in the first embodiment.

During the drying of the ceramic green body, if there is a large difference between the surface temperature of the ceramic green body and the temperature of the air in the drying chamber 110, cracking, deformation, and even frying of the green body may occur. Based on this, in some embodiments, the control module 500 is provided to control the heating element 610 such that the temperature difference between the heated circulating gas stream and the ceramic body is in a range.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

Although embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims

1. A microwave hot air coupled drying device, comprising:

a hot air fan configured to drive the gas in the drying chamber to flow;

2. The microwave and hot air coupled drying device according to claim 1, further comprising an air chamber, wherein the air chamber is independent from the drying chamber, and the air chamber is communicated with the drying chamber through a plurality of circulating air through holes; wherein the circulating air through holes are configured to allow gas in the drying chamber to leave the air chamber through one part of the circulating air through holes and reenter the drying chamber through another part of the circulating air through holes.

3. The microwave-hot air coupled drying apparatus according to claim 2, wherein the plurality of circulating air through holes include a plurality of circulating air inlet holes for air to flow into the drying chamber and a plurality of circulating air outlet holes, the circulating air inlet holes being provided by at least one of:

4. A microwave hot air coupled drying apparatus according to claim 3, wherein the apertures of the air inlet, the moisture extraction air through hole and the circulating air through hole are all smaller than a quarter wavelength of the microwaves.

5. A microwave-heated air-coupled drying apparatus according to claim 3, wherein the heated air fan is disposed opposite the circulating-air through-hole and is configured to pass a gas through the circulating-air through-hole.

6. The microwave-heated air-coupled drying apparatus of claim 1 wherein the heating element, the heated air fan, and the moisture extraction fan are all located outside the drying chamber.

7. The microwave-hot air coupled drying apparatus according to claim 1, further comprising:

8. The microwave-hot air coupled drying apparatus according to claim 1, further comprising:

9. The microwave hot air coupling drying device according to claim 1, wherein a plurality of material trays arranged at intervals are arranged in the drying cavity in a layering mode, and air guide through holes or air guide gaps are formed in the material trays.

10. A ceramic body drying oven comprising a microwave hot air coupled drying apparatus according to any one of claims 1 to 9.