JPH046383A - Dehumidifying air supplying device for grain dryer - Google Patents

Abstract

PURPOSE:To make constant the total amount of sucked and discharged drying air and prevent the suction of humidified air from a dehumidifying device into a dryer by a method wherein an air duct is provided to suck atmosphere as an atmosphere introducing passage for sucking atmosphere upon dehumidifying and drying operation and discharge the humidified air to the outside of the drier through the duct as a humidified air discharging passage upon defrosting operation. CONSTITUTION:Upon dehumidifying and drying operation, dehumidifying air, generated from a dehumidifying device 2, is sucked from a dehumidifying air passage 3 into a guide duct 4 while atmosphere is sucked from a duct 1, changed to an atmosphere introducing passage, into the guide duct 4 and the dehumidifying air is mixed with atmosphere in the guide duct 4 to produce mixed drying air. Upon defrosting operation, humidified air from the dehumidifying device 2 is discharged to the outside of the dryer through the duct 1, changed from the dehumidifying air passage 3 into the guide duct 4 and a humidified air discharging passage.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a dehumidified air supply device for a grain dryer.

Conventional technology Conventionally, dehumidifying air generated from a dehumidifying device is sucked into a guiding wind cylinder through a dehumidifying air path, and is sucked and exhausted from the guiding wind cylinder by an exhaust fan of a grain dryer, thereby drying the grain. This dehumidified air was sucked into the machine and passed through a drying chamber, and the grains in this drying chamber were exposed to this dehumidified air and dried.

Problem to be Solved by the Invention The dehumidifying air generated from the dehumidifying device is sucked into the guiding wind cylinder through the dehumidifying air path, and is sucked and exhausted from the guiding wind cylinder by the exhaust fan of the grain dryer. This dehumidified air is sucked into the dryer and passes through a drying chamber, and the grains accommodated in the drying chamber of this grain dryer are exposed to this drying air and dried.

During this dehumidifying and drying work, even if the suction and exhaust air capacity of the exhaust fan of the dryer is constant, the drying air volume may change and become inconsistent depending on the grain density in the drying chamber.
If this amount of fluctuation is applied to the dehumidifier as it is, dehumidified air that is not sufficiently dehumidified may be inhaled, or frost may accumulate on the dehumidifier, requiring frequent defrosting work. In order to solve these problems, a separate air path is installed to keep the total amount of dry air suctioned and exhausted by the exhaust fan constant, and the humidified air from the dehumidifier during defrosting work is The aim is to create a structure that will prevent it from being inhaled into the cabin.

Means for Solving the Problems Regarding the Invention of Claim 1 This invention provides an air passage I communicating with the outside air and a dehumidifying air passage 3 leading to the dehumidifying device 2 facing the same direction, so that the outside air from the air passage 1 is and the dehumidifying air from the dehumidifying air passage 3 are mixed in a guide wind cylinder 4 to form a mixed drying air, and this mixed drying air is ventilated to a drying chamber 5 for drying grains to dry the grains. During dehumidifying and drying work, the air passage 1 is used as an outside air introduction passage that takes in outside air, or when frost is attached to the dehumidifier 2 and the frost is removed, the air passage 1 is used as the outside air introduction passage. The dehumidified air supply device is configured to function as a humidified air exhaust passage that exhausts humidified air from the device 2, and an outside air introduction passage that takes in outside air.

Effect of the Invention During dehumidifying and drying work, the dehumidified air generated by the dehumidifying device 2 is sucked into the guide wind cylinder 4 from the dehumidifying air passage 3, and the outside air is sucked into the guiding air from the air passage 1 which has changed to the outside air introduction passage. The dehumidified air and the outside air are sucked into the cylinder 4, and are mixed with the outside air in the guiding air cylinder 4 to form a mixed drying air.
The grains passed through and stored in the drying chamber 5 of the grain dryer are exposed to this mixed drying air and dried.

When a large amount of frost adheres to the dehumidifying device 2 and a defrosting operation is performed to remove the frost, the humidified air from the dehumidifying device 2 changes from the dehumidifying air path 3 to the guide wind cylinder 4 and the humidifying exhaust air path. The air is exhausted to the outside of the machine through the air passage 1. In addition, when assisting defrosting work with outside air, the outside air taken in from the air passage 1, which has become an outside air introduction passage, passes from this air passage 1 through the dehumidifying air passage 3 and the dehumidifying device 2. At the same time as the humidified air generated from the dehumidifier 2, the air is discharged from the dehumidifier 2 to the outside of the machine.

Effects of the Invention According to the present invention, an air passage 1 is provided, and this air passage 1 serves as an outside air introduction passage for sucking outside air during dehumidifying and drying work, and by sucking outside air, the total drying air volume is kept constant. This makes it easier to dehumidify and dry the grains. During defrosting work, the air passage 1 changes to a humidifying air exhaust passage, and the humidified air is exhausted to the outside of the machine through this air passage 1, and is not sucked into the grain dryer. grains are not humidified, improving drying efficiency,
Moreover, different functions and effects can be exerted by each of the air passages 1.

Means for Solving the Problems Regarding the Invention of Claim 2 This invention provides an air passage 1 communicating with outside air and a dehumidifying air passage 3 communicating with a dehumidifying device 2 in the same manner. A rotatable switching valve 6 is provided to mix the outside air from the air passage 1 and the dehumidifying air from the dehumidifying air passage 3 in the guide wind cylinder 4 to form a mixed drying air. In a grain dryer that dries grains by passing mixed drying air from a lever to a drying chamber 5 for drying the grains, the air passage 1 is opened to draw outside air during dehumidifying and drying work by switching the switching valve 6. When frost adheres to the introduction passage or the dehumidifying device 2 and a defrosting operation is performed to remove the frost, the air passage 1 changes into a humidifying ventilation passage that discharges the humidified air from the dehumidifying device 2. This is the configuration of the supply device.

Effect of the Invention During dehumidifying and drying work, the dehumidifying air generated from the dehumidifying device 2 is sucked into the guiding wind cylinder 4 from the dehumidifying air passage 3 by the open state of the switching valve 6 in the guiding wind cylinder 4. The wind is sucked into the guiding wind cylinder 4 from the air passage 1 which has changed into an outside air introduction passage, and within this guiding wind cylinder 4, the dehumidifying air and the outside air are mixed to form a mixed drying wind, and this mixed drying wind is Pass through the drying chamber 5,
- The grains accommodated in the drying chamber 5 of the grain dryer are exposed to this mixed drying air and dried.

When a large amount of frost adheres to the dehumidifying device 2, this frost is removed (during defrosting work, the humidified air from the dehumidifying device 2 is The dehumidifying air path 3
The air is exhausted to the outside of the machine through the guide wind cylinder 4 and the air passage 1 which has been transformed into a humidifying air passage.

Effects of the Invention According to the second invention, by switching the switching valve 6 provided in the guide wind cylinder 4, the air passage 1 is configured as an outside air introduction passage for sucking outside air;
Furthermore, by changing to the humidifying air passage which exhausts the humidified air from the dehumidifying device 2, the grains being dehumidified and dried are not humidified by the humidifying air from the dehumidifying device 2, so that the grains are stabilized. It allows drying and also prevents deterioration of grain quality.

Means for Solving the Problems Regarding the Invention of Claim 3 This invention provides an air passage 1 communicating with the outside air and a dehumidifying air passage 3 leading to the dehumidifying device 2 facing the same direction, so that the outside air from the air passage 1 is and the dehumidifying air from the dehumidifying air passage 3 blown by the blower 7 are mixed in the guide wind cylinder 4 to form mixed drying air, and this mixed drying air is ventilated to the drying chamber 5 where the grains are dried for drying. In the grain dryer, when dehumidifying and drying work is carried out by switching the rotational direction of the blower 7, the air passage 1 is placed in the outside air introduction passage that takes in outside air, or the dehumidifier 2 is used to remove frost if it adheres to the grain dryer. During defrosting work, the air passage 1 serves as an auxiliary outside air introduction passage that sucks outside air and exhausts the sucked outside air and humidified air from the dehumidifier 2 to the outside of the machine. It is configured as a dehumidified air supply device.

Effect of the Invention During dehumidifying and drying work, the dehumidifying air generated from the dehumidifying device 2 is blown from the dehumidifying air passage 3 into the guide air cylinder 4 by the forward rotation of the blower 7, and the outside air is blown into the outside air introduction passage. The air is sucked into the guide wind cylinder 4 from the changed air path 1, and this guide wind cylinder 4
The dehumidifying air and the outside air are mixed in the drying chamber to form a mixed drying air. This mixed drying air passes through the drying chamber 5, and the grains stored in the drying chamber 5 of the grain dryer are mixed with this mixed drying air. It is dried by being exposed to drying air.

When a large amount of frost has adhered to the dehumidifying device 2 and a defrosting operation is to be performed to remove the frost, the blower 7 is driven to rotate in the reverse direction, and the outside air is transferred from the air passage 1, which has changed to the outside air introduction passage, to the guide wind cylinder. 4 and the dehumidifying air passage 3 into the dehumidifying device 2, this blown outside air assists the dehumidifying work of the dehumidifying device 2, and this outside air used for this dehumidifying work and this dehumidifying device 2
The humidified air is discharged from the dehumidifier 2 to the outside of the machine.

Effects of the Invention According to this invention, when drying grains are exposed to the humidified air from the dehumidifying device 2 during dehumidification work, the shell side of the grains occurs, so the dehumidifying device 2 is stopped. However, by rotating the blower 7 forward and backward, the dehumidifier 2 can be started even during defrosting work to improve the defrosting work. Since the kernels are not exposed, this eliminates the development of shell sides on the kernels.

Embodiment The district side will explain a state in which a dehumidifying device 2 is installed in a grain dryer 8.

The mechanism 9 of the dryer 8 has a rectangular shape that is long in the front and back direction and is made up of front and rear wall plates and left and right wall plates, and a transfer gutter 10 having a rotatable transfer spiral therein and a ceiling plate 11 are provided above each wall plate. A storage chamber 12 for storing grains is formed in each wall plate below the ceiling plate 11, and below this storage chamber 12 there are ventilation chambers 13 on the left and right sides and a ventilation chamber 14 in the center. Each grain drying chamber 5 is formed between the drying chamber 5 and the storage chamber 12 and communicated with the storage chamber 12. At the lower part of the drying chamber 5, a feeding valve 15 for feeding and flowing down the grain is rotatably supported. A grain collection gutter 16 rotatably equipped with a transfer spiral is provided below each of the drying chambers 5 to communicate with the grain collection gutter 16.

A suction passage chamber 18 having a mixed dry air suction port 17 is formed on the front wall plate, and the dehumidifier 2 is removably installed in front of this suction passage chamber 18, and the dehumidifier 2 is removably installed on the front side of this suction passage chamber 18. an operating device 19 for starting and stopping the dehumidifying device 2 and the dryer 8 for each operation of loading, drying, and discharging;
The dehumidifier 2 and the ventilation chamber 14 are configured to communicate through the suction passage chamber 18, and an exhaust passage chamber 20 is formed behind the rear wall plate. An exhaust fan 21 and an exhaust motor 22 for rotationally driving the exhaust fan 21 are provided on the rear side of the air passage chamber 20.
The valve motors 24 are provided at the lower part of the rear wall plate to rotate each delivery valve 15 via a deceleration mechanism 23.

A supply port for supplying transferred grains into the storage chamber 12 is provided at the center in the longitudinal direction of the bottom plate of the transfer gutter 10, and a diffusion plate 2 is provided below the supply port to uniformly diffuse and return the grains into the storage chamber 12.
5 is provided.

The grain elevating machine 26 is provided in the front part of the front wall plate, a packet conveyor 27 belt is stretched inside, and a discharging cylinder 28 is provided between the upper end and the starting end of the transfer gutter 10 for communication. ,
A supply gutter 29 is provided between the lower end and the terminal end of the grain collection gutter 16 for communication.

A grain raising machine motor 30 is provided above the grain raising machine 26, and the grain raising machine motor 30 rotationally drives the packet conveyor 27 belt, the transfer spiral in the transfer gutter 10, the spreading plate 25, etc. The structure is such that the transfer spiral in the grain collecting trough 16 is rotationally driven via the packet conveyor 27 belt.

Further, a moisture sensor 31 for detecting grain moisture is provided at the vertical center of the grain raising machine 26, and this moisture sensor 31 is activated by transmitting an electrical measurement signal from the operating device 19. The moisture motor 32 is configured to rotate and drive each part of the moisture sensor 31, and receives grains that fall while being conveyed to the upper part by the packet conveyor 27.
The structure is such that the grains are crushed under pressure and at the same time the water content of the crushed grains is detected.

The dehumidifier 2 has a box shape and has an outside air intake port 33 and a discharge port 3 on the upper side of the box body to communicate with outside air and take in outside air.
4, and the outside air to be taken in is sucked into the guide wind cylinder 4. On the lower side of the air passage 1, the dehumidified air generated from the dehumidifier 2 is passed through the guide wind cylinder. A dehumidifying air passage 3 having an outlet 34 for inhaling air into the air guide cylinder 4 is formed, and the respective outlet 34 portions of the air passage 1 and the dehumidifying air passage 3
The outside air and the dehumidified air are mixed inside this guide wind cylinder 4 for a predetermined length to become a mixed dry air, and the discharge port 35 of the guide wind cylinder 4 is connected to the suction passage chamber 18. The structure is arranged in the front part, and the front wall plate of the box of the dehumidifier 2 has a
An inlet 36 for sucking outside air into the dehumidifying device 2 is provided, and an air outlet 37 is provided in the upper wall plate, and the dehumidifying air path 3 and the dehumidifying device 2 are communicated through the air outlet 37. The dehumidified air converted in the dehumidifier 2 is drawn into the dehumidified air path 3.

A switching valve shaft 38 with a switching valve 6 rotatable in the forward and reverse directions is provided in the guide wind cylinder 4, and the switching valve shaft 38 is configured to be rotationally driven by a switching motor 39 that rotates in the forward and reverse directions. When dehumidifying and drying the air, the switching valve 6 is controlled to be open, and the air passage 1 becomes an outside air introduction passage that takes in outside air, and the outside air is taken in from the outside air intake port 33 and transferred to the second air passage. 1, and the discharge port 34 is also drawn into the guide wind cylinder 4, and during defrosting work to remove frost attached to the dehumidifying device 2, the switching valve 6 is controlled to be closed. The air path 1
becomes a humidifying air exhaust passage, and the humidified air from the dehumidifying device 2 flows from the air outlet 37 to the dehumidifying air passage 3, the guide wind cylinder 4, and the air passage 1.
The configuration is such that the air is exhausted to the outside of the machine from the outside air intake port 33.

The outside air intake port 33 is provided with an outside air switching valve shaft 41 rotatable in forward and reverse directions, on which an outside air switching valve 40 for opening and closing the outside air intake port 33 is mounted. It is configured to be rotationally driven by a motor 42, and during dehumidifying and drying work, the outside air switching valve 4° is controlled to open and close states depending on outside temperature conditions, grain conditions, etc., and during defrosting work, it is controlled to open and close states. This outside air switching valve 40 is configured to be controlled to be in an open state.

In order to convert the outside air sucked into the dehumidifier 2 through the suction port 36 into dehumidified air, the low-temperature, low-pressure gas that is the refrigerant is adiabatically compressed into high-temperature, high-pressure gas by the compressor 43 and passes through the condenser 44. During this process, it loses heat and changes into a high-temperature, high-pressure liquid, and then the pressure is reduced to a low-temperature, low-pressure liquid at the expansion valve 45.
Furthermore, when passing through the evaporator 46, the refrigerant absorbs heat and changes into a low-temperature, low-pressure gas, and the refrigerant repeats this cycle in sequence, thereby dehumidifying the external electric air passing through the dehumidifier 2. This configuration converts the air into dehumidified air.

Note that the outside air sucked into the dehumidifier 2 is cooled when passing through the evaporator 46, moisture in the air condenses, and the absolute humidity becomes low-temperature, low-humidity air with reduced absolute humidity. The compressor 43 is configured to be rotationally driven by a compressor motor 47 by absorbing heat when passing through the dehumidifier 2 to obtain low dehumidified air with a temperature slightly higher than room temperature. The evaporator 46 is equipped with a blower 7 that rotates in forward and reverse directions to blow dehumidified air, and a blower motor 49 that rotates in forward and reverse directions. A temperature sensor 5o is provided, and the refrigerant temperature detected by the temperature sensor 5o is input to the operating device 19, and this detected refrigerant temperature and a set refrigerant temperature set and stored in the operating device 19 are configured. This operating device 1
9, and if the comparison result detected refrigerant temperature is detected to be lower than the set refrigerant temperature, the operating device 19 switches the dehumidifying device 2 to the defrosting operation and at the same time switches the switching motor 3
The rotating direction of the valve 9 is controlled to be switched to the defrosting working state, and the switching valve 6 is controlled to be switched to the closed state of the defrosting working state.

The blower 48 is configured to rotate in forward and reverse directions, and during dehumidification and drying work, the blower motor 49 that rotates the blower 48 is controlled to rotate in the forward direction by the operating device 19, and the blower 48 is controlled to rotate in the forward direction. The dehumidified air from the dehumidifying device 2 is sucked in by this blower 48 and sent to the air outlet 3.
7 through the dehumidifying air path 3 into the guide wind cylinder 4, and when the operation device 19 performs switching control from dehumidifying and drying work to defrosting work, the blower motor 4
9 is controlled to rotate in the opposite direction, and the blower 48 is controlled to rotate in the reverse direction, and the outside air taken in from the outside air intake port 33 passes through the air path 1, the guide wind cylinder 4, and the dehumidifying air path 3, and then flows through the blower. At the same time, the humidified air from the dehumidifying device 2 is also sucked in through the air inlet 48 and exhausted from the air inlet 36 of the dehumidifier 2 to the outside of the machine by the air blower 48 .
The configuration is such that air is exhausted to the outside of the machine from 6.

As shown in FIG. 6, an auxiliary blower 51 and an auxiliary blower motor 52 for rotationally driving the auxiliary blower 51 are provided on the rear wall plate of the box body of the dehumidifying device 2. When switching is controlled by the operation device 19 during work, the auxiliary blower motor 52 rotates, and the outside air sucked in through the outside air intake port 33 is transferred from the air path 1 to the guide wind barrel 4 and the dehumidifying air path. At the same time, the humidified air from the dehumidifier 2 is also discharged from the inlet 36 of the dehumidifier 2 to the outside of the machine via the auxiliary blower [51]. It may be configured to exhaust air outside.

Further, as shown in FIG. 7, when the dehumidifying device 2 is switched to the defrosting operation state depending on the temperature of the refrigerant, the temperature of the humidified air from the dehumidifying device 2 is detected by the humidified air temperature sensor 53, and the humidity is detected. The humidified air humidity sensor 54 detects the humidified air and inputs it to the operating device 19, and the operating device 19 calculates the equilibrium moisture content from the temperature and humidity of the input detected humidified air. The set equilibrium water content set and stored in this operating device 19 is compared, and when the calculated equilibrium water content is equal to or higher than the set equilibrium water content, the exhaust fan 2
1 is stopped and the humidified air from the dehumidifier 2 is not sucked into the dryer 8, and when the calculated equilibrium moisture content is less than the set equilibrium moisture content, even the humidified air from the dehumidifier 2 is stopped. Dehumidification and drying may be possible, and the humidified air may be sucked into the dryer 8.

Hereinafter, the operation of the above embodiment will be explained.

By operating the operating device 19, each part 5 of the grain dryer 8, the dehumidifier 2, the moisture sensor 31, etc. are started, and outside air is sucked in from the outside air intake port 33 of the air path 1 of the dehumidifier 2. The outside air that is sucked into the guide wind cylinder 4 from the outlet 34 through the air passage and from the suction port 36 of the dehumidifier 2 is converted into dehumidified air in the dehumidifier 2, and From the air outlet 37 of No. 2 through the dehumidifying air path 3 to the outlet 34
The dehumidified air is drawn into the guiding wind cylinder 4, and the dehumidified air and the outside air are mixed in the guiding wind cylinder 4 to form a mixed drying wind.

The second mixed drying air is dried by controlling the open state of the switching valve 6 in the guiding air cylinder 4, and passes from the discharge port 35 of the guiding air cylinder 4 through the mixed drying air inlet 17, the suction passage chamber 18, and the air blowing chamber 14. The grains that cross the chamber 5, pass through the exhaust chamber 13 and the exhaust path chamber 20, are sucked and exhausted by the exhaust fan 21, and are stored in the storage chamber 12. While flowing down, the grains are exposed to this mixed drying wind and dried, and are fed out to the lower part by the feed valve 15 and flowed down from the grain collection gutter 16, through the supply gutter 29, and into the grain raising machine 26 by the lower transfer spiral. The packets are transported to the upper part by the packet conveyor 27 and supplied into the transfer gutter 10 through the dispensing cylinder 28, and from this transfer gutter 10, the packets are also transferred and fed onto the diffusion plate 25 by the upper transfer spiral, and this diffusion plate 2
5, the grains are evenly diffused and returned into the storage chamber 12 and are circulated and dried. When the moisture sensor 31 detects the same grain moisture as the finishing target moisture, the operation device 19 automatically controls the dryer 8.
will automatically stop and drying of the grains will be stopped.

If the temperature sensor 50 detects a refrigerant temperature below a predetermined value during this dehumidifying and drying work, it is detected that a large amount of frost has adhered to the dehumidifying device 2, and the control is switched to a defrosting work to remove this frost. The switching valve 6 is controlled to be closed, and the humidified air from the dehumidifying device 2 is directed from the air outlet 37 to the outlet 34 of the dehumidifying air path 3, the guide wind cylinder 4, the outlet 34, and the air path. 1 and is exhausted to the outside of the machine from the outside air intake port 33.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention, and FIG. 1 is an enlarged side view, partially cut away, of a grain dryer and a dehumidifier;
Figure 2 is an overall side view of the grain dryer and dehumidifier, Figure 3 is a sectional view taken along line A-A in Figure 2, Figure 4 is a rear view of a portion of the grain dryer, and Figure 5 is a side view of the grain dryer and dehumidifier. Flowcharts, FIGS. 6 and 7 are diagrams showing other embodiments, and FIG. 6 is an enlarged side view showing a portion of the grain dryer and dehumidifier, and FIG. 7 is a flowchart. Explanation of desk symbols 1 Air path 2 Dehumidifier 3 Dehumidifying air path 4 Guide wind cylinder 5 Drying room 6 Selector valve 7 Air blower

Claims (1)

[Scope of Claims] 1. An air passage 1 communicating with the outside air and a dehumidifying air passage 3 leading to the dehumidifying device 2 are provided facing the same direction, and the outside air from the air passage 1 and the dehumidifying air from the dehumidifying air passage 3 are separated. In a grain dryer that mixes these in a guiding wind cylinder 4 to produce a mixed drying air and ventilates this mixed drying air to a drying chamber 5 where grains are dried, the air passage is used during dehumidifying and drying work. 1 is an outside air introduction passage that takes in outside air, or when frost is attached to the dehumidifier 2 and a defrosting operation is to be performed to remove the frost, the air passage 1 exhausts humidified air from the dehumidifier 2. A dehumidifying air supply device that converts into a humidifying exhaust air passage and an outside air introduction passage that takes in outside air. 2 The air passage 1 communicating with the outside air and the dehumidifying air passage 3 leading to the dehumidifying device 2 are provided facing the same direction, and the outside air from the air passage 1 and the dehumidifying air from the dehumidifying air passage 3 are freely rotated. In a grain dryer that is provided with a switching valve 6 and mixes the mixture in the guide wind cylinder 4 to produce mixed drying air and ventilates the mixed drying air to the drying chamber 5 for drying the grains, the switching valve 6 is installed. When dehumidifying and drying work is performed by switching operation, the air passage 1 is set to the outside air introduction passage that takes in outside air, or when frost is attached to the dehumidifier 2 and the frost is removed, the air passage 1 is set to this. A dehumidifying air supply device that turns into a humidifying air exhaust passage that exhausts humidified air from the dehumidifying device 2. 3 An air passage 1 communicating with the outside air and a dehumidifying air passage 3 leading to the dehumidifying device 2 are provided facing the same direction, and the outside air from the air passage 1 and the dehumidifying air from the dehumidifying air passage 3 blown by the blower 7 are provided. In this grain dryer, the grains are mixed in the guide wind cylinder 4 to form a mixed drying air, and this mixed drying air is ventilated to the drying chamber 5 for drying the grains to dry the grains. During dehumidifying and drying work, the air passage 1 is an outside air introduction passage that sucks outside air, or when frost is attached to the dehumidifier 2 and the frost is removed, the air passage 1 is used as an outside air introduction passage that takes in outside air. A dehumidified air supply device that serves as an auxiliary outside air introduction passage and exhausts the sucked outside air and the humidified air from the dehumidifying device 2 to the outside of the machine.