JP5473046B2 - Food dryer external duct and food dryer with duct - Google Patents

Description

  The present invention relates to a food dryer external duct that can be attached to the outer surface of a food dryer and a food dryer with the duct.

  As a conventional food dryer, a heater, a fan, and food to be dried are stored side by side in a rectangular parallelepiped drying case, and an intake hole and a discharge hole are formed on one end surface and the other end surface of the drying case in the horizontal direction. The one with is known. This food dryer is so-called “horizontal blow type food dryer”, and the air sucked into the drying case from the intake hole by the operation of the fan is heated by the heater and supplied to the food to be dried. In addition, air containing moisture taken from the food to be dried is exhausted from the exhaust hole (see, for example, Patent Document 1).

JP-A-9-195 (FIG. 4, paragraph [0012])

  However, in the conventional food dryer described above, the high-temperature air heated by the heater passes through the food to be dried once and is exhausted to the outside even if the humidity is still sufficiently low. Measures were sought to save heating fuel costs and control global warming. In addition, in order to control global warming, it was not enough to simply replace the existing food dryer with a new dryer, and there was a need for measures that could make effective use of the existing food dryer. .

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a food dryer externally attached duct that can be attached to an existing food dryer and improve fuel efficiency, and a food dryer with the duct. .

In order to achieve the above object, a food dryer external duct according to the invention of claim 1 accommodates a heater, an inner fan, and a food to be dried in a rectangular parallelepiped drying case. It was heated while flowing air in the direction of one end exhaust hole which is formed from the formed suction holes in the side wall of the other end to the side wall of the food is attached to the food dryer of separating water from the drying target food dryer An external duct that extends vertically and has a groove shape in which both upper and lower ends are closed, and the whole except for the upper end of the groove opening is closed by the side wall of the food dryer having an exhaust hole; Exhaust cover part attached so that the upper end of the groove opening is located above the upper surface of the food dryer , and a groove shape extending vertically and closed at both upper and lower ends, excluding the upper end of the groove opening the whole have a suction hole An intake cover portion attached to the upper end of which is closed by the side wall of the food dryer and groove opening is positioned above the upper surface of the food dryer, attached to a state of being placed on the upper surface of the food dryer The intermediate connection part that communicates between the upper end of the groove opening of the exhaust cover part and the upper end of the groove opening of the intake cover part and guides the air exhausted from the exhaust hole to the outside of the drying case to the intake hole side And is characterized by being divided into two parts .

The invention of claim 2 is the food drying outside with duct according to claim 1, the intermediate connecting portion is characterized without a rectangular tube extending transversely of the food dryer Tei Rutokoro.

According to a third aspect of the present invention, in the food dryer external duct according to the first or second aspect, the duct intake hole formed in the intermediate connecting portion and the pivot fulcrum at the opening edge of the duct intake hole on the exhaust cover portion side. The air intake damper that closes the duct intake hole and is flush with the wall surface of the intermediate communication part, and that opens toward the inside of the intermediate communication part to open the duct intake hole and maintain it at an arbitrary opening degree. And a duct exhaust hole formed in the exhaust cover part, and a rotation fulcrum at the upper opening edge of the duct exhaust hole, and urged to close the duct exhaust hole, and the pressure in the exhaust cover part is It is characterized in that it has an exhaust damper that is pushed outward to open .

According to a fourth aspect of the present invention, in the food dryer external duct according to any one of the first to third aspects, the food dryer includes a plurality of types of intermediate communication portions having different lengths, and is arranged in a lateral direction of the food dryer. It is characterized in that the intermediate connecting portion can be selected according to the length and attached to the exhaust cover portion and the intake cover portion.

A food dryer with a duct according to the invention of claim 5 is characterized in that the food dryer external duct according to any one of claims 1 to 4 is fixed to the outer surface of the food dryer. Have.

[Invention of Claim 1]
When the food dryer external duct of claim 1 is attached to an existing food dryer, the high-temperature air exhausted from the exhaust case to the outside of the food dryer drying case is the exhaust cover portion of the food dryer external duct, It passes through the intermediate connecting portion and the intake cover portion in this order, and is sucked into the dry case from the intake hole. Thus, according to the present invention, since the high-temperature air exhausted from the food dryer is again sucked into the food dryer, effective use of the heat used for heating the air in the food dryer is achieved, Fuel consumption is improved.

[Invention of claim 2]
The food dry outside with duct according to claim 2, the intermediate connecting portion, since the angled cylindrical shape extending in the transverse direction of the food dryer in the upper surface of the rectangular parallelepiped dry case in food dryer Can be easily installed.

[Invention of claim 3]
In the food dryer external duct according to claim 3, the intake damper can be maintained at an arbitrary opening degree to introduce outside air from the duct intake hole, and the exhaust damper opens according to the increase in internal pressure due to the introduction of the outside air. The internal air can be discharged to the outside through the duct exhaust hole. Specifically, since the intake damper is pivoted and opened to the inside of the intermediate connecting portion, the flow of air on the exhaust cover portion side, that is, the upstream side from the intake damper is restricted, and the internal pressure rises. As a result, the exhaust damper is easily opened, air is smoothly exhausted from the duct exhaust hole, and outside air is smoothly introduced from the duct intake hole. Further, when the intake damper is closed, the internal pressure is reduced, the exhaust damper is also closed, and the introduction and removal of air is suppressed. Thus, according to the present invention, it is possible to reduce the humidity of the air sucked into the food dryer by exchanging part of the air in the food dryer external duct with the outside air as necessary.

[Invention of claim 4 ]
According to the configuration of claim 4 , when a plurality of types of food dryer external ducts are provided corresponding to the length in the lateral direction of the food dryer, a component is provided between the plurality of types of food dryer external ducts. Can be made common and manufacturing costs can be reduced.

[Invention of claim 5 ]
The food dryer with a duct according to claim 5 is excellent in fuel consumption because the food dryer external duct according to any one of claims 1 to 4 is fixed to the outer surface of the food dryer, and is excellent in dry fuel. The manufacturing cost can be reduced.

(A) Simplified perspective view of a food dryer according to the first embodiment of the present invention, (B) Simplified perspective view of a food dryer with a duct Side view of food dryer Perspective view of the side wall and opening adjustment plate of the food dryer Disassembled perspective view of the food dryer external duct Side view of a food dryer with duct Side view of food dryer external duct Perspective view of needle gauge, intake damper manual handle, etc.

[First Embodiment]
Embodiments according to the present invention will be described below with reference to FIGS. The food dryer 20 of the present embodiment shown in FIG. 1A is a so-called shiitake dryer for manufacturing dried shiitake mushrooms, and the whole is covered with a drying case 21 made of sheet metal. The drying case 21 has a rectangular parallelepiped shape in which the horizontal direction is longer (up and down) and longer than the front and rear direction. Moreover, as shown in FIG. 2, the inside of the drying case 21 is divided into a plurality of rooms in the lateral direction, for example, by a plurality of fences 21F. The plurality of rooms are, in order from the left side of FIG. 2, the main heating room 22A, the fan storage room 22B, the first food storage room 22C, the fan storage room 22D, the second food storage room 22E, the sub-heating room 22F, and the third. It is a food storage room 22G.

  A main heater 25 is accommodated in the main heating chamber 22A. The main heater 25 includes, for example, a cylindrical heating drum 25A extending in the front-rear direction of the drying case 21, and a meandering pipe 25B connected to the rear upper surface of the heating drum 25A and extending upward while meandering back and forth. Become. Further, as shown in FIG. 1A, a heating burner 23 is fixed to the lower end portion of the front wall 21X of the drying case 21 corresponding to the main heating chamber 22A. The front end of the heating drum 25 and the heating burner 23 are connected via the front wall 21X of the drying case 21. The meandering pipe 25B protrudes outward from the upper end of the rear wall 21Y of the drying case 21 to form a chimney 24 (see FIG. 1A).

  A branch pipe 26K branches from the rear side surface of the heating drum 25A in the main heater 25 and extends on the lower surface of the drying case 21 to the front end position of the lower end of the sub-heating chamber 22F. The branch pipe 26 </ b> K extends upward while meandering back and forth in the sub-heating chamber 22 </ b> F to form the sub-heating unit 26. Further, the branch pipe 26K protrudes outward from the upper end portion of the rear wall 21Y of the drying case 21 to form a chimney 24 (see FIG. 1A).

  At an intermediate position in the vertical direction of the drying case 21, a fan drive shaft 27 is rotatably supported through the fence 21F from the main heating chamber 22A to the sub-heating chamber 22F. The inner fan 28 is fixed to the fan drive shaft 27 in the fan housing chambers 22B and 22D and the sub-heating chamber 22F so as to rotate integrally.

  The first to third food storage rooms 22C, 22E, 22G are provided with a plurality of tray mounting shelves 29 in the vertical direction. A tray 29T having a mesh structure (usually called “shrimp”) can be placed on each tray placement shelf 29. And the raw shiitake mushroom as the “food to be dried” according to the present invention is placed on each tray 29T. In addition, the front portions of the first to third food storage rooms 22C, 22E, and 22G in the front wall 21X of the drying case 21 are tray storage doors 21T (see FIG. 1 (A)). The tray storage door 21T can be opened and the tray 29T can be taken in and out. Each tray storage door 21T is provided with a glass window 22W (see FIG. 1A) for visually checking the dried state of shiitake mushrooms.

  A plurality of air intake holes 31 are formed in the side wall 21A on the main heating chamber 22A side of the drying case 21 (hereinafter, the side wall 21A is referred to as “intake side wall 21A”). These intake holes 31 are arranged in the horizontal direction, and a plurality of rows of groups of the intake holes 31 are provided above and below the intake side wall 21A.

  As shown in FIG. 3, on the outer surface of the intake side wall 21A, a pair of rails 32, 32 are provided above and below the row of each intake hole 31 group, and the opening adjustment plate 33 slides on the rails 32, 32. Supported as possible. In addition, the opening adjustment plate 33 is also formed with an intake hole 31 group, and the opening adjustment plate 33 and the intake hole 31 group of the intake side wall 21A are aligned or shifted so that the opening degree of the intake hole 31 group is increased. Can be adjusted.

  A plurality of exhaust holes 34 are formed in a row on the side wall 21C on the third food storage room 22G side in the drying case 21 as well as the group of intake holes 31 in the intake side wall 21A (hereinafter, the side wall 21C is referred to as the side wall 21C). "Exhaust side wall 21C"). Further, the opening degree of the exhaust hole 34 can also be adjusted by the opening degree adjusting plate 33X.

  As shown in FIG. 1A, the end portion of the fan drive shaft 27 protrudes from the central portion in the vertical direction of the intake side wall 21A. Correspondingly, a fan drive motor 35 is provided on the front surface of the drying case 21 in the center in the vertical direction at the edge on the side of the intake side wall 21A. A belt 35B is bridged between a pulley 27P fixed to the end of the fan drive shaft 27 and a pulley 35P fixed to the output shaft of the fan drive motor 35, and a belt cover 36 covering the belt 35B is provided. These are fixed to the intake side wall 21A.

  A control unit 39 is fixed above the fan drive motor 35 in the front surface of the drying case 21. The control unit 39 includes an actually measured temperature measured by a thermometer 90 (see FIG. 5) provided in the main heating chamber 22A and a hygrometer 91 (see FIG. 5) provided in a food dryer external duct 40 described later. Based on the measured humidity, the heating burner 23 and a damper drive source 95 (see FIG. 7) to be described later are controlled.

  The description regarding the structure of the food dryer 20 is above. As shown in FIG. 1B, a food dryer external duct 40 (hereinafter simply referred to as “external duct 40”) according to the present invention is fixed to the outer surface of the food dryer 20, and these external dryers are attached. The duct 40 and the food dryer 20 constitute a food dryer 10 with a duct according to the present invention.

  As shown in FIG. 4, the external duct 40 includes an intake cover portion 45, an exhaust cover portion 46, and an intermediate connecting portion 41. The intermediate connecting portion 41 has a rectangular tube shape extending in the lateral direction of the food dryer 20, and the planar shape (the shape seen from above) is substantially the same as the planar shape of the food dryer 20. Specifically, the intermediate connecting portion 41 is formed by connecting, for example, four unit ducts 42, and a length adjusting wall 42C (see FIG. 5) is provided between the pair of unit ducts 42, 42 on the exhaust side wall 21C side. By interposing, the length of the whole intermediate connecting part 41 is adjusted to the same length as the lateral length of the food dryer 20. And the intermediate | middle connection part 41 is arrange | positioned in the position which covers the whole upper surface of the drying case 21. As shown in FIG.

  A duct intake hole 42A is formed on the upper surface of the unit duct 42 disposed on the intake side wall 21A side. The duct intake hole 42A has a rectangular shape that is long in the width direction of the intermediate connecting portion 41 (the front-rear direction of the drying case 21). The duct intake hole 42A is opened and closed by an intake damper 42T. The intake damper 42T has substantially the same rectangular shape as the duct intake hole 42A, is rotatably connected to the opening edge of the duct intake hole 42A on the exhaust side wall 21C side, and is flush with the upper surface wall of the intermediate connecting portion 41. Thus, the duct intake hole 42A is closed and rotated toward the inside of the unit duct 42 to open the duct intake hole 42A.

  A rotation support shaft 42J that rotates integrally with the intake damper 42T is provided at the rotation center of the intake damper 42T. One end portion of the rotation support shaft 42J protrudes forward in the food dryer 20, and the protrusion portion The needle gauge 43, the intake damper manual handle 44, and the power output unit of the damper drive source 95 shown in FIG. 5 are fixed.

  The damper drive source 95 includes a reduction gear mechanism (not shown) and a motor (not shown) connected to the input side of the reduction mechanism inside a rectangular parallelepiped gear box 95B fixed to the front surface of the intermediate connecting portion 41. ing. Further, an output hole penetrating in the front-rear direction is provided at a position near the upper end of the damper drive source 95, the rotation support shaft 42J penetrates the output hole in the front-rear direction, and the rotation support shaft 42J is an output of the speed reduction mechanism. Connected to the side.

  The needle gauge 43 is for visually confirming the inclination of the intake damper 42T, and is in a cantilever shape and protrudes from the rotation support shaft 42J in the same direction as the intake damper 42T. The gear box 95B is fixed in a state of being in partial contact with the front surface of the intermediate connecting portion 41, and the proximal end portion of the needle gauge 43 is located between the gear box 95B and the front surface of the intermediate connecting portion 41. It fits in the gap between them.

  The intake damper manual handle 44 is suspended from a portion of the rotation support shaft 42J that protrudes forward from the gear box 95B, and extends to a position overlapping the front surface of the drying case 21. The lower end portion of the intake damper manual handle 44 is covered from the front by a damper opening adjustment cover 37 fixed to the front surface of the drying case 21. Specifically, as shown in FIG. 7, the damper opening adjustment cover 37 has a pair of leg portions 37 </ b> C and 37 </ b> C from both ends of the main plate portion 37 </ b> B having the arc-shaped slit 37 </ b> A toward the front surface of the drying case 21. It has a protruding gate structure. The leg portions 37C and 37C are fixed to the front surface of the drying case 21, and the lower end portion of the intake damper manual handle 44 is received in the gap between the main plate portion 37B and the front surface of the drying case 21.

  Further, a part of the lower end portion of the intake damper manual handle 44 is exposed forward through the arc-shaped slit 37A, and the female screw 44X formed in the exposed portion is operated from the front of the arc-shaped slit 37A. A knob 93 is attached. Specifically, the operation knob 93 has a structure in which a male screw 93B protrudes from the center of a disc-shaped knob main body 93A, and the male screw 93B is screwed into the female screw 44X, so that the operation knob 93 is brought into the intake damper. A manual handle 44 is attached. With these configurations, the intake damper 42T can be opened / closed by either automatic opening / closing using the damper drive source 95 and manual opening / closing by operating the operation knob 93, as will be described later.

  As shown in FIG. 4, the intake cover portion 45 and the exhaust cover portion 46 have a groove shape extending in the vertical direction, and the groove openings are both ends in the lateral direction of the food dryer 20 as shown in FIG. 5. It is occluded by the surface. Specifically, the intake cover 45 and the exhaust cover 46 are formed from both side edge portions of the main cover wall 50 that are disposed to face each lateral end surface of the food dryer 20 (the outer surface of the intake side wall 21A or the exhaust side wall 21C). The upper and lower end portions of the groove-shaped structure from which the pair of side cover walls 47, 47 are projected are closed by the upper surface wall 48 and the lower surface wall 49. As shown in FIG. 5, the intake cover portion 45 covers the entire intake side wall 21 </ b> A and protrudes upward from the drying case 21, and is fixed to the drying case 21 with screws or the like (not shown). The exhaust cover portion 46 covers the entire exhaust side wall 21C and protrudes upward from the drying case 21, and is fixed to the drying case 21 with screws or the like (not shown). Then, both end portions of the intermediate connecting portion 41 are connected to portions of the intake cover portion 45 and the exhaust cover portion 46 that protrude upward from the drying case 21, and the whole has a portal structure as shown in FIG. 6. The inner space of the intake cover portion 45 and the exhaust cover portion 46 communicates with the inner space of the intermediate connecting portion 41.

  As shown in FIG. 4, a pair of operation windows 51 are formed vertically on each side cover wall 47 of the intake cover portion 45 and the exhaust cover portion 46. A pair of rails 52 and 52 are provided on both side edges of the operation window 51, and the operation window 51 is closed by inserting a closing plate 53 between the rails 52 and 52 from above. Then, the operation window 51 can be opened by operating the closing plate 53, and the opening adjustment plate 33 or the opening adjustment plate 33X inside the intake cover portion 45 and the exhaust cover portion 46 can be operated.

  One side cover wall 47 disposed on the front side of the food dryer 20 in the intake cover portion 45 is formed with a belt cover receiving portion 54 by cutting a middle portion in the vertical direction into a square shape. Then, the belt cover 36 is accommodated in the belt cover receiving portion 54 (see FIG. 5). Further, a hygrometer 91 (see FIG. 5) is attached to a position closer to the upper portion of the main cover wall 50 in the intake cover portion 45 facing the intake side wall 21A.

  As shown in FIG. 4, a plurality of duct exhaust holes 55 are vertically arranged in the main cover wall 50 of the exhaust cover portion 46. The duct exhaust hole 55 has a rectangular shape extending in the width direction on the main cover wall 50. Each duct exhaust hole 55 is opened and closed by an exhaust damper 56. The exhaust damper 56 has substantially the same rectangular shape as the duct exhaust hole 55, is rotatably connected to the upper opening edge of the duct exhaust hole 55, and is urged to close the duct exhaust hole 55 by its own weight. It pivots to the outside of the external duct 40 and opens.

  The description regarding the structure of the external duct 40 of this embodiment and the food dryer 10 with a duct is above. Next, the effects of the external duct 40 and the food dryer 10 with a duct will be described.

  In order to start the operation of the food dryer 10 with the duct, the raw shiitake mushroom is placed on the tray 29T (see FIG. 2) and stored in the first to third food storage rooms 22C, 22E, 22G. The male screw 93B is left loose with respect to the female screw 44X of the intake damper manual handle 44. Then, for example, the target temperature and the target humidity are set on the operation panel provided in the control unit 39, and a start switch (not shown) is turned on. Then, the main heaters 25 and 26 generate heat due to the flame generated by burning the kerosene or heavy oil by the heating burner 23, and the fan drive motor 35 drives the inner fan 28 to rotate at a constant rotational speed. The air sucked into the case 21 is fed laterally within the drying case 21. As a result, the high-temperature air heated by the main heater 25 and the sub heater 26 passes through the first to third food storage rooms 22C, 22E, 22G and is discharged from the exhaust hole 34.

  Then, the control unit 39 changes the output of the heating burner 23 according to the deviation between the target temperature (set temperature) and the temperature actually measured by the thermometer 90 (see FIG. 5) in the main heating chamber 22A. Further, the control unit 39 determines whether or not the actually measured humidity measured by the hygrometer 91 in the external duct 40 matches the target humidity (set humidity), and when the actually measured humidity exceeds the target humidity. Is opened by rotating the intake damper 42T toward the inside of the intermediate connecting portion 41 by the damper drive source 95. Then, the air flow on the exhaust cover portion 46 side, that is, the upstream side is restricted from the opened intake damper 42T, the internal pressure rises, and the exhaust damper 56 is opened by the internal pressure. Thereby, a part of the air exhausted from the food dryer 20 is exhausted from the duct exhaust hole 55, and outside air is introduced from the duct intake hole 42A. Further, the air that has been exhausted from the food dryer 20 and not exhausted from the duct exhaust hole 55 passes through the gap between the intake damper 42T and the inner surface of the external duct 40 and merges with the external air from the duct intake hole 42A. Then, the reused heated air and the outside air are mixed and sucked into the food dryer 20 from the group of intake holes 31. At this time, the humidity is lowered by mixing the heated air and the outside air, and as a result, the actually measured humidity by the hygrometer 91 is also lowered. Then, when the actually measured humidity falls below the target humidity, the intake damper 42T operates in a closing direction, and the ratio of heated air increases from the intake amount of the outside air. Note that when the heated air and the outside air are mixed, the measured temperature is lowered together with the measured humidity, so that the output of the heating burner 23 is increased.

  Specifically, when raw shiitake mushrooms are accommodated in the food dryer 10 with ducts and the operation of the food dryer 10 with ducts is started, a large amount of water vapor is generated from the shiitake mushrooms. During the initial period after the start of the operation, the intake damper 42T and the exhaust damper 56 are continuously opened. Then, with the passage of time, the amount of water vapor gradually decreases from shiitake mushrooms, and the intake damper 42T and the exhaust damper 56 move in the closing direction.

  Moreover, in the food dryer 10 with a duct of this embodiment, it can switch from normal mode to damper manual mode by operating the operation panel with which the control unit 39 was equipped. Then, the damper drive source 95 is not energized, and the operation knob 93 can be operated to manually open and close the intake damper 42T. In this case, the operation knob 93 may be tightened after the male screw 93B of the operation knob 93 is loosened with respect to the female screw 44X of the intake damper manual handle 44 and the intake damper 42T is set to an arbitrary opening degree. Then, the edge of the arc-shaped slit 37A in the damper opening adjustment cover 37 is tightened between the knob main body 93A of the operation knob 93 and the intake damper manual handle 44, and the intake damper 42T is fixed at an arbitrary rotational position. can do. Thereby, the intake amount of the outside air during operation of the food dryer 10 with duct can be arbitrarily changed based on experience.

  As described above, when the external duct 40 of the present embodiment is attached to the existing food dryer 20, the high-temperature air exhausted from the exhaust hole 34 to the outside of the drying case 21 of the food dryer 20 causes the external duct 40 to be attached. Since it passes through and is sucked into the dry case 21 from the air intake hole 31, the heat used for heating the air in the food dryer 20 is effectively used, fuel efficiency is improved, and dry food (dried shiitake) is manufactured. Cost can be reduced. Moreover, the humidity of the air suck | inhaled by the food dryer 20 can also be reduced by exchanging some air in the external duct 40 with external air as needed. Further, the external duct 40 has a portal structure in which a groove-shaped exhaust cover portion 46 and an intake cover portion 45 are extended downward from both ends of a rectangular tube-shaped intermediate connecting portion 41 extending in the lateral direction (FIG. 6). Therefore, it can be easily attached in a state where the upper surface and both side surfaces of the rectangular parallelepiped drying case 21 are covered. Further, by changing the number of unit ducts 42 constituting the intermediate connecting portion 41, it is possible to cope with a plurality of types of food dryers 20 having different lateral lengths.

[Other Embodiments]
The present invention is not limited to the above-described embodiment. For example, the embodiments described below are also included in the technical scope of the present invention, and various other than the following can be made without departing from the scope of the invention. It can be changed and implemented.

( 1 ) In the external duct 40 of the first embodiment, the duct intake hole 42A and the intake damper 42T are disposed in the intermediate connecting portion 41. However, even if the duct intake hole and the intake damper are disposed in the intake cover portion. Good.

( 2 ) Although the intermediate connection part 41 of the first embodiment can be divided into a plurality of unit ducts 42, a plurality of intermediate connection parts that cannot be divided are prepared with different lengths, and dried with food. An intermediate connecting portion having a length corresponding to the machine may be selected and combined with the intake cover portion and the exhaust cover portion.

( 3 ) In the external duct 40 of the first embodiment, the intermediate connecting portion 41 has a rectangular tube shape. However, the intermediate connecting portion 41 is not limited to a rectangular tube shape. For example, the intermediate connecting portion may have a cylindrical shape. Or it is good also as a structure which makes an intermediate | middle connection part a groove shape, and closes the groove opening on the upper surface of a food dryer with facing down.

( 4 ) Although the shiitake dryer was illustrated as the food dryer 20 in the said 1st Embodiment, the external duct 40 is not limited to what is attached to the food dryer 20 which dries a raw shiitake mushroom. For example, you may attach the external duct which concerns on this invention to the food dryer which used seaweed, vegetables, etc. as the "food to dry".

1 0 food dryer 20 food dryer 21 drying casing 25 main heater 26 sub heater 28 Inner fan 31 air inlets 34 exhaust hole 37K damper drive source 39 control unit 40, 60 an external duct (food dry outside with duct)
41 Intermediate communication part 42A Duct intake hole 42T Intake damper 4 5 Intake cover part 4 6 Exhaust cover part 55 Duct exhaust hole 56 Exhaust damper 65 Intake fan 66 Exhaust shutter

Claims (5)

A heater, an inner fan, and food to be dried are accommodated in a rectangular parallelepiped drying case, and the intake hole formed in the side wall at one end in the horizontal direction of the drying case is changed to the exhaust hole formed in the side wall at the other end. And a food dryer external duct attached to a food dryer that heats the air while flowing it and removes moisture from the food to be dried,
A groove shape extending vertically and closed at both upper and lower ends, except for the upper end of the groove opening, is entirely closed by the side wall of the food dryer having the exhaust hole, and the upper end of the groove opening. An exhaust cover portion attached so that the portion is located above the upper surface of the food dryer ;
A groove shape that extends vertically and is closed at both upper and lower ends, except for the upper end of the groove opening, is entirely closed at the side wall of the food dryer having the air intake hole and the upper end of the groove opening. An intake cover portion attached so that the portion is located above the upper surface of the food dryer ;
Attached to the upper surface of the food dryer , communicates between the upper end of the groove opening of the exhaust cover part and the upper end of the groove opening of the intake cover part , and from the exhaust hole, the A food dryer external duct, characterized in that it is divided into an intermediate connecting portion for guiding the air exhausted outside the drying case to the intake hole side. Wherein the intermediate connecting portion, the food drying outside with duct according to claim 1, characterized in Tei Rukoto angled tubular shape extending in the transverse direction of the food dryer. A duct inlet hole formed in the intermediate connecting portion,
A rotating fulcrum is provided at an opening edge of the duct intake hole on the exhaust cover side, and the duct intake hole is closed flush with the wall surface of the intermediate connecting part, while facing the inner side of the intermediate connecting part. An intake damper capable of rotating to open the duct intake hole and maintaining an arbitrary opening;
A duct exhaust hole formed in the exhaust cover portion;
An exhaust damper having a pivotal fulcrum at the upper opening edge of the duct exhaust hole, energized so as to close the duct exhaust hole, and being pushed to the outside of the exhaust cover part by the pressure in the exhaust cover part ; The food dryer externally attached duct according to claim 1 or 2, further comprising: A plurality of types of intermediate communication portions having different lengths are provided, and the intermediate communication portions can be selected according to the length in the lateral direction of the food dryer and attached to the exhaust cover portion and the intake cover portion. The food dryer externally attached duct according to any one of claims 1 to 3. A food dryer with a duct, wherein the food dryer external duct according to any one of claims 1 to 4 is fixed to an outer surface of the food dryer.

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