JP2592997B2 - Dehumidifying dryer - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a dehumidifying dryer, and more particularly, to a dehumidifying dryer connected to a drying unit having a condenser for heating introduced outside air and containing a grain to be dried. A first ventilation path, a second ventilation path having an evaporator for dehumidifying the introduced outside air and having an outlet to the outside, and a second ventilation path from a downstream side of the condenser in the first ventilation path. A bypass passage leading to the downstream side of the evaporator, adjusting means for adjusting the amount of dehumidified air flowing from the second ventilation passage to the first ventilation passage through the bypass passage, and the first ventilation passage and the second ventilation passage. Blower means for ventilating the road;
And a control means for adjusting the amount of dehumidified air by the adjusting means.

[Conventional technology]

In the conventional dehumidifier / dryer, the amount of dehumidified air from the second ventilation path to the first ventilation path is set to a constant condition by the adjustment of the adjustment means by the control means, and the dehumidification air of the set air amount is set. The air is introduced into the heated outside air in the first ventilation path, and the air obtained therefrom is supplied to the drying section consistently for drying the grain. Specifically, by controlling the control means, the air dehumidified by the evaporator is introduced into the heated outside air to the maximum, or the amount of dehumidified air to the first ventilation path by the adjusting means is adjusted. The air under the predetermined condition obtained by introducing the dehumidified air of the set air amount into the heated outside air while setting the predetermined condition is consistently supplied to the drying unit.

[Problems to be solved by the invention]

When a grain is dried by such a conventional dehumidifying dryer, the amount of dehumidified air to the first ventilation path is suppressed as much as possible, and the air supplied to the drying section is heated, and the grain is heated to a high temperature using the air. It is thought that the drying efficiency of the grain will be improved by drying. However, if the heated air is supplied to the drying unit consistently, and the air is dried at a high temperature with the air,
Although the drying efficiency of the grain is improved, in a state where the grain contains a large amount of water (for example, in the early stage of drying), there is a problem in the quality of the grain such as cracking of the grain. Further, when the deviation of the moisture contained in the cereal is large (for example, at the beginning of drying), another problem arises that the deviation cannot be easily eliminated by drying at high temperature.

The present invention has been made in view of such circumstances, and it is another object of the present invention to provide means capable of improving the drying efficiency of cereals while solving the above-described problems in cereal quality.

[Means for solving the problem]

A first characteristic configuration of the dehumidifying dryer according to the present invention is provided with a moisture detecting means for detecting moisture of the cereal in the drying section, and the first adjusting means based on the detection information of the moisture detecting means. The control means is configured to adjust the amount of dehumidified air to the ventilation passage.

According to a second characteristic configuration of the dehumidifying dryer according to the present invention, in addition to the above-described configuration, a heater for heating and adjusting dehumidified air supplied to the drying unit is provided in the first ventilation path, and the control unit Is characterized in that the heating of the dehumidified air by the heater is adjusted based on the detection information of the moisture detecting means.

[Action]

According to the dehumidifying dryer having the first characteristic configuration, the control unit sets the state of the stored grains in the drying unit to high-temperature drying based on the detection information of the moisture detection unit, that is, information on the moisture of the grains in the drying unit. At the stage of repelling,
The amount of dehumidified air flowing to the first ventilation path can be increased by performing adjustment by the adjusting means, and the temperature of the dehumidified air can be reduced to such an extent that the quality of the grain is not reduced.
Then, after the stage where the grain quality is not deteriorated even when high-temperature drying is performed, the control unit performs adjustment by the adjusting unit to suppress the amount of dehumidified air flowing to the first ventilation path, and The dehumidified air supplied to the section is heated, and the heated air is supplied to the drying section to improve the drying efficiency of the grain.

According to the dehumidifying dryer having the second characteristic configuration, when the heating capability of the air is insufficient from the stage where the high-temperature drying does not cause the grain quality to deteriorate, The shortage can be compensated by the heater, and the drying efficiency of the grain can be reliably improved.

〔The invention's effect〕

Thus, according to the present invention, it is possible to improve the efficiency of grain drying in the drying section while eliminating the conventional problem that the grain quality deteriorates at the beginning of drying and the like.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the dehumidifying dryer of the present invention comprises a drying section (A) for accommodating grains to be dried and an air supply means (B) for sending dehumidifying air for drying to the drying section (A). Exhaust means (C) for sucking and discharging air in the drying section (A);
A circulation unit (D) for circulating and moving the grains in the drying unit (A) and a control unit E for controlling each of the units are provided. The drying section (A) and the air feeding means (B) are connected via a duct (1) so as to be freely coupled and separable.

A storage space (SP) for storing grains for drying is formed inside the drying section (A). In the storage space (SP), a plurality of ventilation paths (2) are traversed therethrough. ) Is formed.

An equalizer (3) is provided above the storage space (SP) to uniformly distribute the grains, and a rotary valve (4) below the storage space (SP) is configured to discharge the grains little by little from the gap of the inclined plate (4). 5) is provided. In the storage space (SP), the grain supplied from the equalizer (3) little by little and the grain discharged little by little by driving the rotary valve (5) are balanced. While the height level exceeding the uppermost ventilation path (2) is maintained, each grain gradually moves downward.

The ventilation path (2) is connected to an air supply frame (2a) and blows out dehumidifying air from the air supply means (B) to a storage space (SP), and is connected to an exhaust frame (2b). There is a device for sucking and discharging air from the storage space (SP) by suction by the exhaust means (C). In each case, a chevron frame with a lower opening is formed so as to be located in the stored grain.

The air supply means (B) has two upper and lower ventilation paths (1).
7) and (20).
A condenser (15) and a first blower fan (16) are provided in 7), and an evaporator (1) is provided in a lower second ventilation path (20).
8) and a second blower fan (19) are provided respectively.
Further, a compressor (27) is provided in the second ventilation passage (20).
A heat pump circuit is constituted by this, the condenser (15), the evaporator (18), and an expansion mechanism (not shown). The condenser (15) has a function of heating the outside air introduced into the first ventilation path (17), and the evaporator (18) has a function of heating the second air.
It functions to dehumidify the outside air introduced into the ventilation path (20).

An outlet (21) of the first ventilation path (17) is connected to the duct (1). That is, the first ventilation path (17) connected to the drying section (A) includes the duct (1). The second ventilation path (20)
Outlet (22) communicates with the outside. Further, a downstream side of the condenser (15) in the first ventilation path (17) and a downstream side of the evaporator (18) in the second ventilation path (20) are provided with ventilation holes (23) as bypass paths. ) (Hereinafter, referred to as a bypass path (23)). The (1) blower fan (16) and the second blower fan (19) function as blower means for performing a ventilation action on the first ventilation path (17) and the second ventilation path (20). Is to be fulfilled.

In each of the outlet (22) and the bypass (23),
Dampers (24) and (25) are provided as adjusting means for adjusting the amount of dehumidified air flowing from the second ventilation path (20) to the first ventilation path (17) through the bypass path (23). The dampers (24) and (25) are configured to be simultaneously and reciprocally opened and closed by an electric motor (26) driven and controlled by a control signal from the control means (E).

That is, when the damper (24) is fully closed, the damper (25) is fully opened, and in this state, the evaporator (18)
All of the dehumidified air cooled and dehumidified by the above is added to the first ventilation path (17) via the bypass path (23). Then, the dehumidified air is sent to the duct (1), and the dehumidified air is further sent to the drying section (A), so that the air supply means (B) uses the dehumidified air for grain drying. The function of sending out to the drying section (A) is achieved. When the damper (24) is fully open, the damper (25) is fully closed, and the evaporator (18)
All the air cooled and dehumidified in the above is discharged to the outside, and only the air heated by the condenser (15) is sent to the duct (1). Further, when the damper (24) is in the appropriate opening state, the other damper (25) is in the appropriate opening state corresponding to the opening degree of the damper (24). In this state, the cooling and dehumidification is performed by the evaporator (18). A part of the dehumidified air is added to the first ventilation path (16) via the bypass path (23).

The exhaust means (C) is, specifically, the exhaust frame (2
an exhaust blower (10) for sucking and discharging the humid air of the storage space (SP) to the outside by inhaling the storage space (SP), and in the drying section (A) by suctioning to the upper region of the storage space (SP). A dust removing device (11) for sucking and discharging dust floating on the outside to the outside.

The circulating means (D) is specifically arranged below the rotary valve (5), and the grain discharged from the storage space (SP) at appropriate time intervals by intermittent driving of the rotary valve (5). And a lower screw conveyor (6) for transporting the lower screw conveyor (6) to the side opposite to the location of the air supply means (B), and disposed vertically along the side of the storage space (SP). Elevator (7) for lifting grain transported by
And an upper portion that is disposed above the storage space (SP) and transports the grain pumped by the elevator (7) to the upper center of the drying section (A) where the equalizer (3) is located. A screw conveyor (8). The grain transported by the upper screw conveyor (8) is
The equalizer (3) uniformly radiates the fuel into the storage space (SP) from above. When the cereal is circulated using the circulation means (D), the cereal is
Before reaching the ventilation path (2), the storage space (S
Since it passes over the space above P) over time, the tempering drying of the grain is performed in the space above.

At the upper part of the drying section (A), a full meter (9) for detecting whether or not the grain is stored in the storage space (SP) in a full state is provided. On the side, a grain thermometer (41) for detecting the temperature of the grains stored in the storage space (SP) is provided.

On the other side of the lower part of the drying section (A), a hopper (12) for supplying grains to the drying section (A), and more specifically, the hopper (12) and the storage space ( A single grain moisture meter (13) for measuring the moisture of the grains stored in the SP) is provided as moisture detecting means for detecting the moisture of the grains in the drying section (A).

The detection information obtained by the moisture detecting means (13) is input to the control means (E). Then, the control means (E) controls the damper (2) based on the information.
The operations of (4) and (25) are controlled using the motor (26), and the control is performed to adjust the amount of dehumidified air to the first ventilation path (17).

Thus, when the control means (E) adjusts the amount of dehumidified air, the drying unit (13) is controlled based on the detection information of the moisture detecting means (13), that is, information on the moisture of the grain in the drying unit (A). When the state of the stored grain in A) is in a stage of avoiding high-temperature drying, the dehumidification flowing to the first ventilation path (17) by adjusting the dampers (24) and (25) by the control means (E). By increasing the amount of air, the temperature of the dehumidified air supplied to the drying section (A) can be lowered to such an extent that the quality of the grain does not deteriorate. Then, after the stage in which high-temperature drying may be performed, the amount of dehumidified air flowing to the first ventilation path (17) is adjusted by adjusting the dampers (24) and (25) by the control means (E). Hold down,
The dehumidified air supplied to the drying section (A) is heated, and the heated air is supplied to the drying section (A) to improve the drying efficiency of the grain.

The stage where the state of the stored grains in the drying section (A) avoids high-temperature drying is, specifically, a state described below.

That is, for example, in the initial stage of drying in which the water content in the grain exceeds a certain moisture content (17% to 19%), defects such as cracks in the grain are generated in the grain by high-temperature drying. Therefore, such a state is one of the steps to avoid the high-temperature drying. In addition, if the grain is dried at a high temperature in the initial stage of drying when the water contained in the grain has a large deviation, the moisture removal of the grain having a high moisture content is effectively performed, while the moisture removal of the grain having a low moisture content is similarly performed. The deviation cannot be easily eliminated. Therefore, such a state is also one of the steps to avoid the high-temperature drying.

Therefore, in the initial stage of drying in which the moisture content or the deviation is large, the grain is dried so as not to cause a crack or the like by lowering the temperature of the dehumidified air, and the moisture content is constant (17% to 19%). The high-temperature drying is performed only when the value becomes less than or equal to or less than the predetermined value.

The white arrows in the drying section (A) and the air supply means (B) indicate the flow of air.

At an appropriate position in the duct (1), a blast thermometer (42) for measuring the temperature of the air flowing therethrough is provided, and the temperature of the air obtained by the blast thermometer (42) is measured. The detection information is input to the control means (E).
Further, at an appropriate position in the duct (1), a plurality of heaters (43) are provided as another heating means for adjusting the temperature of the dehumidified air supplied to the drying section (A). The control means (E) controls the heating state of the dehumidified air by the heater (43) based on the information from the blast thermometer (42), for example, selects from the plurality of heaters (43). The heater (43) is controlled to heat the dehumidified air.

Thus, when the heating state is controlled by the heater (43) using the control means (E), heated air is dried by the condenser (15) by the condenser (15) in a state where high-temperature drying may be performed. When the heating capacity is insufficient just by supplying to the heater (A), the insufficient heating capacity is determined by the heater (4).
The heating is carried out according to 3), and the drying efficiency of the grain can be reliably improved.

Specifically, the control means (E) is provided below the drying section (A), and controls the first control device (14) which controls the entire dehumidifying dryer, and the air supply means (B). A second control device (28) provided at an upper portion and controlling the air supply means (B).

The (1) th control device (14) is provided with the circulating means (D).
And the exhaust means (C) is controlled.

On the other hand, the second control device (28) includes detection information of a temperature sensor (29) for detecting the dry-bulb temperature of the outside air, a humidity sensor (30) for detecting the humidity of the outside air, and detection information of the moisture detection means (13). The second control device (28) is inputted and the heat pump circuit in the air supply means (B), the first blower fan (16), the second blower fan (19), the damper (24), (25) and the like are controlled.

 Next, another embodiment will be described.

The amount of dehumidified air to the first ventilation path (17) is adjusted by the dampers (24) and (25) based on the detection information of the moisture detecting means (13), and the drying unit (A) is used only by that. An embodiment in which the heating of the dehumidified air supplied to the heater is adjusted is also conceivable. That is, an embodiment in which the heater (43) as a means for heating the dehumidified air is not provided is also conceivable.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

The drawings are longitudinal side views showing one embodiment of the dehumidifying dryer according to the present invention. (15) ... condenser, (16) ... blowing means, (17) ...
... first ventilation path, (18) evaporator, (19) ... blowing means, (20) ... second ventilation path, (22) ... outlet,
(23)… Bypass path, (24)… Adjustment means, (25)…
... Adjustment means, (43) ... heater, (A) ... drying section,
(E) Control means.

Claims (2)

(57) [Claims] 1. A condenser (1) for heating external air to be introduced.
5) a first ventilation path (17) connected to the drying section (A) for storing the grains to be dried, and an evaporator (18) for dehumidifying the introduced outside air and an outlet (22) to the outside. ), And from the downstream side of the condenser (15) in the first ventilation path (17) to the downstream side of the evaporator (18) in the second ventilation path (20). A bypass passage (23) leading to the first ventilation passage (17) from the second ventilation passage (20) through the bypass passage (23).
Adjustment means (24), (25) for adjusting the amount of dehumidified air flowing to
And air blowing means (16) and (19) for ventilating the first ventilation path (17) and the second ventilation path (20), and the dehumidified air by the adjusting means (24) and (25). A dehumidifying / drying device provided with a control means (E) for adjusting the amount, wherein a moisture detecting means (13) for detecting the moisture of the grain in the drying section (A) is provided, and the moisture detecting means (13) is provided. ) Based on the detection information, the first means by the adjusting means (24), (25).
A dehumidifier / dryer comprising the control means (E) for adjusting the amount of dehumidified air to the ventilation path (17). 2. A heater (43) for heating and controlling the dehumidified air supplied to the drying section (A) is provided in the first ventilation path (17), and the control means (E) is provided for controlling the moisture detection. The dehumidifier / dryer according to claim 1, wherein the heater (43) adjusts the heating of the dehumidified air based on the detection information of the means (13).