JP4142546B2 - Dryer - Google Patents

Description

The present invention is a high 抄製seaweed sample containing water rate, to a dryer for heating and drying a combination of air blowing and microwave.

  The plate laver automatic dryer dries approximately 5,000-10,000 laver per hour in about 90 minutes, but the variation in the paper weight reduces the commercial value of the laver, and during the initial and middle stages of the drying process, Generally, it is common practice to adjust the blending ratio (mixing ratio) of the seaweed and water before drying by sampling the weight by short-time drying.

  The conventional dryer, which extracts the seaweed rice cake and dries it for a short time, is an external heating system that heats and blows far-infrared heaters by attaching the rice cake that has been spun from the seaweed and dehydrated with a sponge to the rotating device. It took 15 minutes.

  Microwave is an internal heating method in which the object to be heated (dielectric material) itself becomes a heating element based on the principle of dielectric heating, and in the microwave oscillation frequency of 2,450 MHz generally used in Japan, the microwave of water is especially used. The loss factor is large, and microwave power can be efficiently absorbed by the moisture inside and outside the laver cells and directly heated inside. There is no application or idea of microwave to a dryer that pulls out cocoons and dries for a short time.

  There is a device that sandwiches laver between two conveyors and continuously supplies laver into the apparatus to irradiate with microwaves, but there is a problem with heat shrinkage of laver (for example, Patent Document 1).

  Moreover, although the tableware and garbage are dried batchwise using a microwave oven, there existed a problem that it was difficult to respond to heat shrinkage, such as a plate seaweed (for example, patent documents 2, 3).

Japanese Patent Application Laid-Open No. 54-23157 (FIG. 1, Example of Specification) Japanese Patent Laid-Open No. 2-157524 (FIG. 1, embodiment of the specification) Japanese Patent Laid-Open No. 2001-296028 (FIG. 1, technical field to which the invention belongs)

  A combination of internal drying that directly heats moisture inside and outside the seaweed cells by microwaves, and external drying that exhausts saturated steam on the surface of the laver by hot air blowing, which is a conventional far-infrared heater heating and external blowing method that blows air The present invention provides a drying method and apparatus for rapid drying in less than half of the drying time.

  If we look at the drying of dried foods such as laver in a microscopic way, the drying speed can be increased by increasing the absorption of microwave power, the blowing speed, and the difference in the vapor pressure between the blown air and the heated dried food surface. The purpose is to do.

  From a macro perspective, the purpose is to equalize the microwave power distribution and the air flow rate in order to equalize uneven drying (which causes shrinkage and wrinkles in seaweed) due to the location of the material to be heated. To do. Moreover, it aims at suppressing the shrinkage | contraction and wrinkle (heating shrinkage) of a to-be-heated material by suppressing the deformation | transformation of a toe by the to-be-heated object attachment component with a toe attachment mechanism. It aims at accelerating | stimulating the water | moisture-content drying between a soot and a to-be-heated dried material by ventilating up and down the to-be-heated dried material and a soot.

  When the dried product to be heated progresses and the wet moisture content decreases, the amount of microwave power absorbed by the dried product to be heated decreases. It is intended that the amount of microwave power absorbed by the range bottom plate increases and the temperature rises, and the generated heat is used for drying.

In the microwave oven that has a microwave irradiation part in the lower part, the dried laver to be dried on the sea bream is dried using both microwave heating and air blowing. Air that has increased in water vapor pressure due to heating is blown out from the front, and a duct is provided inside the range body to guide the air supplied from the back to the vicinity of the heated product, between the heated product and the bottom of the range. There is a passage and air can be blown above and below the dried product to be heated, and the mounting parts of the dried product to be heated can be taken in and out from the front of the range body and the basket can be attached and detached. A dryer characterized by a batch-type structure having a ventilation entrance / exit space between the lower passage inlet and the lower passage outlet for blowing air under the ridge and a plate or claw ridge attachment mechanism;
Secondly, the dryer according to the first aspect of the present invention is attached to the upper position of the heated dried product in the range body through a side wall and a synthetic resin plate, and is electrically insulated and attached to both sides of the synthetic resin plate. A dryer provided with a metal microwave reflector that allows microwaves to pass through the space between the walls,
Thirdly, the dryer according to the first aspect of the present invention, wherein the dryer controls the blowing time after the end of the microwave heating,
Fourthly, the dryer according to the first invention, wherein the heat generated by the microwave oven bottom plate by microwave irradiation is used for drying,
Fifthly, the dryer according to the first invention, wherein the microwave reflection plate also serves as a blower duct,
Sixthly, the dryer according to the first invention, wherein the dryer is capable of venting from the small through holes using a microwave reflector having a plurality of small through holes,
Seventhly, the dryer according to the first aspect of the present invention, wherein the blower is heated with a heater to form hot air so that the air can be exhausted with a small amount of air below a saturated vapor pressure (steam generation),
Eighth, the dryer according to the first invention, wherein the microwave irradiation unit is provided on the side wall or ceiling surface of the range body,
Consists of.

  Therefore, by combining internal drying that directly heats the moisture inside and outside the seaweed cells by microwaves and external drying that exhausts saturated steam on the surface of the laver by hot air blowing, external heating that performs conventional far-infrared heater heating and ventilation It can be dried quickly in less than half the drying time of the method, the time required for the weight inspection of the seaweed is shortened, and by adjusting the preparation of the seaweed and water before drying in the plate seaweed drying, production with less variation in paper weight can be produced It becomes possible.

  In order to equalize the drying of the heated product to be dried, the ratio of the lateral width of the range body rear air inlet to the range body inner width dimension is set to 0. Set to 5 or more. Also, since the back air inlet uses punching metal to prevent radio wave leakage, the area of the back air inlet is widened to increase the air flow, and the air duct is narrowed by the internal duct air collecting plate, near the object to be heated At the same time as increasing the wind speed, the internal duct air collecting plate was inclined to allow air to be blown under the tub and to increase the drying speed. Furthermore, the drying speed was increased by increasing the difference in water vapor pressure between the blown air and the surface of the dried product to be heated by increasing the supply air temperature by the heater and microwave heating.

  By providing a metal microwave reflector, providing an internal duct that suppresses the spread of air flow in the vertical direction, and performing a control method of providing air blowing time after microwave heating is completed, the thickness of the dried material to be heated such as laver , Dispersion of microwave power distribution, variation in blowing speed, increase of water vapor pressure in the vicinity of the object to be heated to the downstream than upstream, and decrease drying unevenness due to the above causes Became possible.

  Since the seaweed has entered the gaps of the sea bream when the paper is made, it is possible to reduce the deformation of the sea bream with the heated object mounting part with the seam attachment mechanism, so that the shrinkage and wrinkles of the heated object due to drying can be Can be dried with equivalent quality.

  The water content of the laver that has been spun and dehydrated with nori is about 50g per sheet, and is about 3g after drying. When the dried product to be heated progresses and the moisture content decreases, the amount of microwave power absorbed by the dried product to be heated decreases, and glass that is a dielectric but has a low microwave loss coefficient with respect to water is used as the bottom plate of the range. By using this, the amount of microwave power absorbed by the range bottom plate increases and the temperature rises, and the amount of heat generated can be used for raising the air temperature of the armpit, thereby improving the drying efficiency.

According to the present invention, when the plate seaweed is dried by heating in a microwave oven, the shrinkage and wrinkles of the plate seaweed (to-be-heated object) can be shortened with a quality equivalent to that of an automatic dryer in a short time by using both microwave and air blowing It became possible to dry efficiently.

  FIG. 1 is a schematic sectional view of a dryer showing an embodiment of the present invention. The range body 1 has a rectangular parallelepiped shape, and the inner surface is made of metal that reflects microwaves. The range bottom surface 16 is made of heat-resistant glass or the like that can pass microwaves. Microwaves generated by the magnetron 3 pass through the waveguide 4 and are scattered by a rotating radio wave scattering antenna (not shown) in the microwave irradiating unit 2, and from the microwave irradiating unit 2 below the bottom surface of the range body 1. It is a structure that is irradiated inside.

  In order to dry the heated object 6 such as laver 6 'placed on the reed 5 (the area is smaller than that of the reed 5) using both microwave heating and air blowing, the outside air is ducted by the fan 7 on the back of the range body. 8 passes through the inside of the range main body 1 through the plurality of small through holes 20 ′ of the back surface air inlet 9. The rear air supply port 9 is made of punched metal having a small through hole 20 'having a diameter of 0.8 to 3 mm in order to prevent leakage of radio waves. In addition, in order to reduce the spread of the air blow in the horizontal direction in the range main body 1, the ratio of the horizontal width of the range main body rear air inlet 9 to the width dimension in the range main body 1 is set to 0.5 or more.

  The air supplied to the range body 1 from the back surface air inlet 9 is the internal duct air collecting plate 10 (FIG. 1 (a) diagram) or directly (FIG. 5 (a) diagram). A metal front exhaust port 13 having a plurality of small through holes 20 ′ having a diameter of 0.8 to 3 mm from the front surface of the object to be heated 6, which is guided to the vicinity and flows into the upper passage 11 and the lower passage 12 of the basket 5. The air is exhausted from the upper surface exhaust port 13 ″ formed on the ceiling surface 1 ″ to the outside air.

  The front exhaust port 13 is provided in a front opening / closing plate 13 ′ that can be opened and closed by a hinge or a shutter mechanism, and has a structure that allows the heated and dried material 6 to be taken in and out.

  The material to be heated attachment part 14, the internal duct air collecting plate 10, the internal air duct 15 and the eaves 5 is made of a material having a smaller dielectric loss than water such as polypropylene, polyethylene, or Teflon (registered trademark).

  FIG. 3 shows a state in which the dried food 6 and the cocoon 5 such as laver are attached to the cocoon attachment mechanism 17 of the article to be heated attachment 14. The cocoon 5 used for making the plate seaweed is generally a rectangular shape in which the knives are knitted with weft. In the plate laver automatic dryer, the seaweed is stirred in water and the nori 6 'is made into a quadrilateral shape on the 簀 5. Kudzu water flows down from the gap between the ridges of the cocoon 5, presses and dehydrates the laver 6 'with a sponge, and then removes the cocoon 5 for weight inspection, attaches it to the heated object attachment component 14, and puts it in the dryer of the present invention for drying. To do.

  A space for a lower passage inlet 12 ′ and a lower passage outlet 12 ″ is provided between the heated object mounting part 14 and the ridge 5 shown in FIGS. Yes.

  An example of the implementation of the hook attachment mechanism 17 shown in FIG. 3 (a) is a plate or an oval cross-section pawl that can be inserted between the jaws of the hook 5, and the hook 5 is detachably attached at four locations. Has a strength that does not deform due to the shrinkage force when the dried material 6 is dried. The material of the nail | claw of the eaves attachment mechanism 17 is the same material as the to-be-heated object attachment component 14, and it assembles by the welding adhesion of the to-be-heated object attachment component 14 and resin. The claw of the hook attachment mechanism 17 shown in FIG. 3 (c) is further increased in attachment strength when the groove 24 is provided in the article to be heated attachment 14 and welded 23. FIG. 3D is an example in which a scissors mounting mechanism 17 ″ is welded 23 to the side surface of the heated mounting part 14.

  The hook attachment mechanism 17 'is in a state in which claws are attached to the outer four places (the other three places are target positions and not shown) of the heated article attachment component 14. FIG. 3 (b) shows the case where the cage 5 is attached with the direction of the direction of the wind in the direction of the wind flow, and the kite attachment mechanism 17 ″ is inserted between the cages of the cage 5. The amount of air at the center and the end of the lower passage 12 can be adjusted by preventing the sagging and changing the air volume of the lower passage 12 of the rod 5 at the entrance and exit of the guide 18. ), It is possible to provide a guide 18 as well.

  A heater 19 is provided in the middle of the outer duct 8 to raise the temperature of the air sucked by the fan 7 and exhaust it without generating steam from the front exhaust port 13 even if the air volume is reduced compared to the case where the heater is not heated. it can. By providing the internal air duct 15 in the upper part of the upper passage 11, it is possible to suppress the air flow in the upper passage from being diffused upward downstream of the kite 5, and to suppress a decrease in the wind speed on the kite 5.

The metal microwave reflection plate 20 of FIG. 2 is attached by being electrically insulated through a side wall of the range body 1 and a resin reflection plate attachment component (synthetic resin plate) 21. The reflector mounting component (synthetic resin plate) 21 has, for example, a rod shape as shown in FIG. 4 (a), and is fastened to the microwave reflector 20 with a resin screw or the like.

  When the microwave irradiation unit 2 has a diameter smaller than the dried material 6 to be heated, and the dried material 6 to be heated has a quadrangular shape such as a plate nori 6 'and the drying speed at the four corners and the surroundings is low, the microwave irradiation unit 2 irradiates. The microwave that was partially absorbed by the dried object 6 to be heated was reflected by the microwave reflection plate 20, and many reflected waves hit the four corners and the periphery of the dried object 6 to be heated. 6 microwave power can be absorbed and the drying speed can be made uniform.

  As shown in the top view of FIG. 4A, a space through which microwaves can pass is provided between the microwave reflector 20 and the range body 1, and the microwaves reflected by the side walls and the ceiling are again reflected by the microwave reflectors. Reflection is repeated so as to pass through the dried object 6 to be heated under 20.

  The microwave reflecting plate 20 in FIG. 4 (b) has a through-hole 20 ″ having a d1 of 60 mm (half wavelength of microwave) or more in the central part, and the drying speed of the central part of the heated dried product 6 is adjusted to the peripheral part. 4 (c) is an example in which the round shape of Fig. 4 (a) and (b) is an octagonal shape, and the microwave reflection plate 20 is only a flat plate. Instead, it is possible to provide uneven shapes for scattering of radio waves, a curved shape or inclination for adjusting the reflection angle, and a plurality of arrangements such as four-sheet divisions such as four leaves instead of one sheet. The shape of the reflector is changed according to the thickness variation, shape, and properties.

  In FIG. 1, the microwave reflector 20 and the internal air duct 15 are doubled, but the microwave reflector 20 can also serve as the internal air duct 15. The microwave reflection plate 20 has a plurality of small through holes 20 ′ having a diameter of 0.8 to 8 mm to allow ventilation, and mixes with the air above the microwave reflection plate 20 to reduce the humidity and increase the drying speed. Moreover, it can suppress that the water vapor pressure of the ventilation of the vicinity of the to-be-heated dry material 6 raises the downstream from the upstream of ventilation.

  Since microwaves are repeatedly reflected inside the range body 1, the microwave irradiating unit 2 can be provided on the side wall or ceiling surface of the range body 1, but the heated object mounting component 14 is rotated using a turntable or the like. If this is not possible, it is desirable to scatter radio waves by providing a rotating radio wave scattering antenna (not shown) such as a stirrer fan at the exit of the irradiation unit.

  As drying of the heated product 6 progresses and the moisture content decreases, the amount of microwave power absorbed by the heated material 6 decreases, and the amount of microwave power absorbed by the bottom surface 6 of glass or the like increases, resulting in a temperature rise. Then, the drying efficiency can be improved by utilizing the generated heat amount for raising the blowing temperature under the basket 5.

  After the microwave heating is completed, by performing a control method of providing a blowing time by setting a timer, variation in the moisture content depending on the location of the heated article 6 is reduced, and when the weight is taken out from the range body 1 in the outside air Since the weight change due to moisture absorption is small, stable weight inspection can be performed promptly.

  The same effect was obtained even with the mesh 5 having air permeability. In addition, in the case of a heated dried product having a high fluidity that flows down between the pots 5, it can be placed in a dish-like container and batch-type dried with the dryer of the present invention.

(A) is a longitudinal sectional view showing the dryer of the present invention, and (b) is a partially enlarged view of (b). FIG. 1A is a front view taken along line AA. (A) and (B) are perspective views showing a laver-making machine and its mounting mechanism. (A), (b), and (c) are plan views showing the shape of the microwave reflector. (A) is a longitudinal side view of an embodiment of the present invention, and (B) is a front view taken along line B-B.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Range main body 1 'Side wall 1 "Ceiling surface 2 Microwave irradiation part 5 ６ 6 Heated dry matter 6' Nori 10 Internal duct air collecting plate 12 Passage 14 Heated object attachment component 15 Air duct 16 Range bottom plate 19 Heater 20 Metal Microwave reflector 20 'Small through hole 21 Reflector mounting parts

Claims (8)

In the microwave oven that has a microwave irradiation part in the lower part, the dried laver to be dried on the sea bream is dried using both microwave heating and air blowing. Air that has increased in water vapor pressure due to heating is blown out from the front, and a duct is provided inside the range body to guide the air supplied from the back to the vicinity of the heated product, between the heated product and the bottom of the range. There is a passage and air can be blown above and below the dried product to be heated, and the mounting parts of the dried product to be heated can be taken in and out from the front of the range body and the basket can be attached and detached. A dryer characterized by a batch-type structure having an aeration / exit space between a lower passage inlet and a lower passage outlet for blowing air under the ridge and a ridge attachment mechanism using plates or claws .   The dryer according to claim 1, wherein the dryer is electrically insulated and attached to the upper position of the heated dry matter in the range body through a side wall and a synthetic resin plate, and between the synthetic resin plate and both side walls. Dryer provided with a metal microwave reflector that allows microwaves to pass through the space.   It is a dryer of Claim 1, Comprising: The dryer which controls ventilation time after completion | finish of microwave heating.   The dryer according to claim 1, wherein the heat generated by the microwave oven bottom plate due to microwave irradiation is used for drying.   It is a dryer of Claim 1, Comprising: The dryer with which a microwave reflecting plate serves as a ventilation duct.   The dryer according to claim 1, wherein the microwave reflection plate having a plurality of small through holes is used to allow ventilation through the small through holes.   The dryer according to claim 1, wherein the blower is heated with a heater to form hot air so that the air can be exhausted with a small amount of air at a saturation vapor pressure (steam generation) or less.   The dryer according to claim 1, wherein the microwave irradiation unit is provided on a side wall or a ceiling surface of the range body.

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