JPH03267683A - Ventilating device for agricultural products drying machine - Google Patents

Abstract

PURPOSE:To satisfactorily dry agricultural products irrespective of the outside air temperature by providing a condenser for heating introduced fresh air, and mixing heated air from a first air duct with dehumidified air from a second air duct passing through a bypass passage, and further feeding the mixed air to an agricultural products drying machine. CONSTITUTION:With the actuation of an air vent device B, in a first air vent chamber 17 introduced fresh air is heated by a condenser 15 and the whole of the heated air is sent to an air duct 1 by a first fan 16. Further, in a second air vent chamber 20 the heated air is cooled and dehumidified by an introduced evaporator 18, and thereafter part of the dehumidified air is discharged from a discharge port 22 and the remaining part is sent to the first air vent chamber 17 through a vent port 23. Namely, the whole amount of the heated air in the first vent chamber 17 and the part of the dehumidified air in the second air duct 20 are mixed into drying mixed air.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a ventilation device for supplying drying air to a produce dryer.

[Conventional technology]

A ventilation device for such a produce dryer has both a condenser that heats the introduced outside air and an evaporator that cools the introduced outside air, as disclosed in Japanese Patent Application Laid-Open No. 62-41576. It has a ventilation path connected to the dryer and a damper that adjusts the amount of air, and
A device is known that includes an outside air introduction path connected to the downstream side of the ventilation path, and a blower fan that acts to ventilate the ventilation path and the outside air introduction path.

In this ventilation system, the condenser and evaporator work together to mix dehumidified air from the ventilation path, which has been dehumidified at room temperature, with air from the outside air introduction path, and send the mixed air to the produce dryer. By operating the damper to increase or decrease the amount of air from the outside air introduction path, the mixing ratio of the mixed air can be adjusted as desired, and even just dehumidified air can be sent to the produce dryer.

[Problem to be solved by the invention]

The above-mentioned ventilation device has two modes: a state in which only dehumidified air is sent, and a state in which air is sent in a mixture of dehumidified air and outside air, but both send air at approximately the same temperature as the outside air.

Therefore, when the outside air temperature is high, agricultural products can be dried quickly, but when the outside air temperature is low, for example, when used in winter or in a cold region, there is a drawback that a high drying effect cannot be obtained.

The present invention has been made in view of this situation, and its purpose is to provide ventilation for properly drying agricultural products regardless of the outside temperature.

[Means to solve the problem]

The ventilation device for a produce dryer according to the present invention has a condenser that heats the introduced outside air, and includes a first ventilation passage connected to the produce dryer and an evaporator that dehumidifies the introduced outside air. a second ventilation passage including a discharge port to the outside; a bypass passage from the first ventilation passage to the second ventilation passage; and a bypass passage from the second ventilation passage to the first ventilation passage through the bypass passage. The first feature of the present invention is that it includes an adjusting means for adjusting the amount of dehumidified air flowing into the air passage, and an air blowing means for acting on the first air passage and the second air passage.

Further, a second characteristic configuration is that the first ventilation passage is arranged above the second ventilation passage.

[For production]

According to the first characteristic configuration, in the first ventilation path, the introduced outside air is heated by the condenser to become heated air, and the entire amount of the air is sent to the produce dryer by the ventilation action of the ventilation means. In addition, in the second ventilation path, the introduced outside air is cooled by the evaporator and becomes dehumidified air, a part of which flows through the bypass path to the first ventilation path by the ventilation action of the ventilation means, and the rest flows through the exhaust port. is discharged to the outside. Then, the heated air from the first ventilation path and the dehumidified air from the second ventilation path that has passed through the bypass path are mixed, and this mixed air is sent to the produce dryer.

In this case, the amount of dehumidified air flowing through the bypass path to the first ventilation path and the amount of dehumidified air flowing outside through the outlet are:
It can be adjusted inversely by operating the adjusting means.

When the outside temperature is high, the adjustment means adjusts to increase the amount of dehumidified air flowing from the second ventilation path to the first ventilation path, and supplies mixed air containing a large amount of dehumidified air to the produce dryer at a temperature close to the outside temperature. Also, when the outside temperature is low, the amount of dehumidified air is adjusted to decrease, and mixed air containing a large amount of heated air is sent in.

According to the second characteristic configuration, since the heated air moves upward, the lower part of the first ventilation path is not heated, and the dehumidified air moves downward, so the upper part of the second ventilation path is not heated. Not cooled. That is, when comparing the temperature difference between the first ventilation passage and the second ventilation passage, the difference between the lower part of the first ventilation passage and the upper part of the second ventilation passage is the smallest. Therefore, in a state where the first ventilation passage is arranged above the second ventilation passage, heat loss due to conduction is suppressed to the lowest level.

〔Effect of the invention〕

With the first characteristic configuration, heated air can be sent, so even when the outside temperature is low, the drying capacity of the produce dryer can be increased.

According to the second characteristic configuration, by arranging the first and second ventilation paths one above the other, it is possible to reduce the installation space in a plan view and also to reduce the decrease in efficiency due to heat loss.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

As shown in the figure, a grain dryer (A) and a ventilation device (B) are connected via a ventilation duct (1).

The grain dryer (A) has a storage space (SP) for storing and drying grains, and this storage space (S
A plurality of ventilation passages (2) are provided laterally across P). In the storage space (SP), the upper equalizer (3)
The grains supplied in small amounts from While maintaining the height level exceeding path (2), each grain gradually moves downward. The ventilation passage (2) is connected to the air supply frame (2a) and blows out the dehumidifying air sent through the ventilation duct (1) into the storage space (SP), and the exhaust frame (2b) There is one connected to the storage space (SP) for sucking air from the storage space (SP), and both are formed in the grain by a chevron-shaped frame with an open bottom.

In the grain dryer (A), tempering and drying is performed while circulating the grains by returning the grains discharged from the storage space (SP) to the storage space (SP). That is, the grains discharged from the storage space (SP) at appropriate intervals by the intermittent drive of the rotary valve (5) are transported laterally by the lower screw (6), and the transported grains are transferred to the elevator ( 7), and
The lifted grains are transported to the upper center by the upper screw (8), and the transported grains are evenly distributed into the storage space (SP) by the equalizer (3).

Note that (9) shown in the figure is a filling needle that detects the height level of grains in the storage space (SP), and (10) is an exhaust frame (
2b) is an exhaust blower for discharging humid air in the storage space (SP) to the outside by taking air into the storage space (SP); (11) is a dust removal device for discharging dust floating in the storage space (SP) to the outside; (12) is a hopper for supplying grains into the grain dryer (A), (13) is a single grain moisture meter for measuring the moisture content of grains, and (14) is a control for the entire device. (=0) is a control device that controls the flow of air.The ventilation device (B) has a condenser (15) and a first
A first ventilation chamber (17) (corresponding to a first ventilation path) having a ventilation fan (16) (corresponding to a ventilation means), an evaporator (18) and a second ventilation fan (19) (corresponding to a first ventilation fan); (corresponding to the blowing means)
A ventilation chamber (20) (corresponding to a second ventilation path) is provided with the second ventilation chamber (20) located directly below the first ventilation chamber (17).

Further, the outlet (21) of the first ventilation chamber (17) is fitted and connected to the ventilation duct (1), and the outlet (22) of the second ventilation chamber (20) communicates with the outside. The chamber (17) and the second ventilation chamber (20) communicate with each other via a ventilation port (23) (corresponding to a bypass path). Furthermore, a second ventilation room (2
Dampers (24) and (25) for adjusting the amount of air are provided at the discharge port (22) and the ventilation port (23) of the air conditioner 0), respectively. These dampers (24) and (25) are configured to be opened and closed simultaneously and reversely by the drive of one electric motor (26).

When the ventilation device (B) operates, the first ventilation chamber (17)
After the introduced outside air is heated by the condenser (15), the entire amount of the heated air is transferred to the first blower fan (
16) to the ventilation duct (1). Also the second
In the ventilation room (20), after the introduced outside air is cooled and dehumidified by the evaporator (18), a part of the dehumidified air is sent to the exhaust port (
22), and the rest is discharged from the vent (23).
through the air to the first ventilation chamber (17). In other words, the first
The total amount of heated air in the ventilation chamber (17) and the second ventilation chamber (20)
A part of the dehumidified air is mixed in the first ventilation chamber (17) to become drying mixed air, and the mixed air is passed through the ventilation duct)-(
It will be sent to the grain dryer (A) through 1).

The proportion of mixed air sent to the grain dryer (A) can be changed by adjusting the amount of dehumidified air sent from the second ventilation chamber (20) to the first ventilation chamber (17). For example, if the electric motor (26) is driven so that the damper (24) on the discharge port side is operated to the closed side and the damper (25) on the vent side is operated to the open side, the dehumidified air contained in the mixed air can be The ratio increases, and the damper (24
) to the opening side and the damper (25) on the vent side to the closing side, if the electric motor (26) is driven,
The proportion of dehumidified air included in the mixed air will be reduced. Furthermore, the electric motor (2
6), the mixed air becomes only heated air.

In addition, (27) in the figure is a compressor, and this compressor (27)
), the heating and dehumidifying action of the condenser (15) and evaporator (18) is stopped, and outside air can be supplied directly as drying air.

[Another example]

In the previous embodiment, the vent hole (2
3), but a vent (23) may also be provided to send the air to the upper side of the condenser (15).

The configuration of each part can be changed in various ways, such as arranging the first ventilation path (17) and the second ventilation path (20) in the horizontal direction.

The ventilation device (B) blows air not only from a grain dryer but also from a dryer used for other agricultural products.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings by the reference numerals.

[Brief explanation of drawings]

The drawing is an overall vertical side view schematically showing a ventilation device for a produce dryer according to the present invention. (15)... Capacitor (16), (1
9)... Air blowing means, (17)... First
Ventilation duct, (18)... Evaporator, (20
)...Second ventilation passage, (22)...Discharge port, (23)...Bypass passage, (24), (
25)...Adjustment means.

Claims (1)

[Claims] 1. A first ventilation path (15) having a condenser (15) for heating introduced outside air and connected to a produce dryer;
7) and an evaporator (1) that dehumidifies the introduced outside air.
8) and a second ventilation passage (20) provided with an outlet (22) to the outside; and a bypass passage (20) from the first ventilation passage (17) to the second ventilation passage (20). 23), adjusting means (24), (25) 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); Ventilation duct (17
) and ventilation means (16) and (19) that act to ventilate the second ventilation path (20). 2. The first ventilation path (16) is connected to the second ventilation path (20
) The ventilation device for a produce dryer according to claim 1, wherein the ventilation device is arranged above the dryer.