JPH06281345A - Drying apparatus - Google Patents

Abstract

PURPOSE:To improve the stability of finished quality of fine radish strips in a drying apparatus for manufacturing fine radish strips by taking, as respective dried loads, difference between actual weights and set finished weights of articles to be dried on the left side in a storage chamber and those of articles to be dried on the right side in the storage chamber, and automatically setting an operation time ratio of a forward rotation ventilation operation an a reverse rotation ventilation operation in response to the ratio of the respective dried loads. CONSTITUTION:A dried load DELTAw1 of articles to be dried X is obtained by calculating a difference DELTAw1 of an actual weight w1 of the articles and a set finished weight xm1 of the articles, the articles X being located on the right side in a storage chamber 2, i.e., being located upstream upon forward rotation (solid line arrow A) of a fan 3. Likewise, a dried load DELTAw2 of articles X' to be dried is obtained by calculating a difference DELTAw2 between actual weight w2 of articles X' and a set finished weight Xm2 of the same, the articles X' being located on the left side in the storage chamber 2, i.e., being located upstream in the reverse rotation. Setting means 9a automatically sets a ventilation operation time ratio of the forward an reverse rotations in response to the ratio of both dried loads. More specifically, reverse rotation ventilation operation time is the more increased as the dried load DELTAw2 of the articles X' is increased with respect to the dried load DELTAw1 of the article X.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The first and second aspects of the present invention relate to a dryer used for manufacturing shredded radish, etc., and forward rotation in which drying air is passed from one side of a storage chamber that stores an object to be dried to the other side. The present invention relates to a dryer that automatically switches between a ventilation operation and a reverse ventilation operation in which drying air is ventilated from the other side of the storage chamber to a side every predetermined time.

[0002]

2. Description of the Related Art Conventionally, in a dryer such as the one described above, in automatic switching between normal rotation ventilation operation and reverse rotation ventilation operation,
As shown in FIG. 5, the operation time T1 of the normal rotation ventilation operation and the operation time T2 of the reverse rotation ventilation operation are simply equal (T1 = T2).
A fixed value is set, and the normal rotation ventilation operation and the reverse rotation ventilation operation are automatically switched every set time.

[0003]

However, in the conventional dryer, the object to be dried, which is located on one side of the storage chamber (that is, the object to be dried which is located on the windward side in the normal rotation ventilation operation), and the storage chamber To the one side due to the difference in the storage load and the drying load due to the difference in the moisture content, etc. with the drying target located on the other side (that is, the drying target located on the windward side in reverse ventilation operation) The finish drying quality is different between the drying target and the drying target closer to the other side.For example, when the drying target facing the one side reaches an appropriate finishing quality, the drying target facing the other side is already over-dried. There is a problem that the desired finished quality cannot be stably obtained for the entire amount of the storage and drying target object, because the drying condition has not yet reached a sufficient dry state.

An object of the first and second inventions is to solve the above problem by automatically switching between the normal rotation ventilation operation and the reverse rotation ventilation operation in a rational manner.

[0005]

The drying machine according to the first aspect of the present invention is characterized in that it has a normal rotation ventilation operation in which a drying air is blown from one side of a storage chamber that stores an object to be dried to the other side, and the storage is performed. In a configuration in which a reverse ventilation operation in which drying air is ventilated from the other side of the chamber to the one side is automatically switched at predetermined time intervals, the actual weight and the set finish weight of the object to be dried located near the one side of the storage chamber. While making the difference with the one side to the dry load,
The difference between the actual weight of the object to be dried located on the other side and the set finish weight is defined as the drying load on the other side, and normal rotation ventilation operation is performed according to the ratio of the drying load on the one side and the drying load on the other side. This is because the setting means for automatically setting the operation time ratio with the reverse-flow ventilation operation is provided.

Further, the drying machine according to the second aspect of the present invention is characterized in that the drying fan is blown from one side of the storage chamber storing the object to be dried to the other side, and the other side of the storage chamber is operated. In the configuration for automatically switching between reverse air flow operation in which drying air is blown from one side to the one side at predetermined time intervals, the actual weight of the drying object positioned near the one side of the storage chamber and the position closer to the other side. The setting means is provided to automatically set the operating time ratio between the normal rotation ventilation operation and the reverse rotation ventilation operation in accordance with the ratio of the drying target to the actual weight.

[0007]

In other words, as the drying performance characteristics of this type of dryer, the larger the operation time ratio of the reverse rotation ventilation operation in the automatic switching between the forward rotation ventilation operation and the reverse rotation ventilation operation, the larger the object to be dried toward the other side (reverse rotation ventilation). The drying capacity for the object to be dried that is on the windward side in operation is larger than the drying capacity for the object to be dried on the one side, and conversely, the larger the operating time ratio of the forward ventilation operation, the more the object to be dried on the one side. The drying ability for (the object to be dried that is on the windward side in the normal rotation ventilation operation) is greater than the drying ability for the object to be dried that is closer to the other side.

Therefore, according to the above-mentioned characteristic configuration of the first aspect of the present invention, the difference between the actual weight of the object to be dried located on one side of the storage chamber and the set finish weight is set as the one side drying load, and The difference between the actual weight of the object to be dried located on the side side and the set finish weight is taken as the drying load on the other side, and normal rotation ventilation operation and reverse rotation ventilation operation are performed according to the ratio of the drying load on one side and the drying load on the other side. By automatically setting the operating time ratio with the operation, the one-side drying target and the other-side drying target can be brought out to the one side in a form that shows the drying capacity according to their drying load. It is possible to obtain an even finish dry state for the object to be dried and the object to be dried on the other side in the same required time.

On the other hand, when the initial moisture contents of the one-side drying object and the other-side drying object are equal, the ratio of the drying load of the one-side drying object and the other-side drying object is It can be approximated by the ratio of the actual weight of the object to be dried on one side to the actual weight of the object to be dried on the other side.

Therefore, according to the above-described characteristic configuration of the second aspect of the present invention, as a simple method when the initial moisture contents of the one-side drying target and the other-side drying target are equal, Automatically sets the operating time ratio between normal rotation ventilation operation and reverse rotation ventilation operation according to the ratio of the actual weight of the drying target located on one side to the actual weight of the drying target located on the other side. Thus, for each of the one-sided drying target object and the other-sided drying target object, it is possible to have a form in which the drying ability corresponding to the drying load thereof is exerted, and thereby, the one-side deviation target object is dried. It is possible to obtain an even finish dry state for the object to be dried on the other side in the same required time.

[0011]

In other words, according to the first aspect of the present invention, when the object to be dried on one side has reached an appropriate finish quality, the object to be dried on the other side has already reached the overdry state, or vice versa. Effectively and automatically prevent things that have not yet reached a sufficient dry state, such as differences in the storage amount and moisture content between the object to be dried on one side and the object to be dried on the other side. Regardless of this, it became possible to stably obtain the desired finish quality for the entire amount of the storage and drying target object, and eventually it was possible to eliminate the generation of low-grade finished products and to secure a high economic efficiency in terms of dried product manufacturing. .

Further, according to the second aspect of the present invention, the operating time ratio between the normal rotation ventilation operation and the reverse rotation ventilation operation is set in accordance with the actual weight ratio between the one-side drying object and the other-side drying object. It is possible to automatically and stably obtain a desired finish quality that is uniform for all the amount of the storage and drying target object, even with a simple control mode.

[0013]

【Example】

 (First Embodiment) Next, an embodiment of the first invention will be described.

FIG. 1 shows the structure of a dryer. 1, 1'is a trolley for placing and storing objects to be dried X, X '(raw material of shredded radish etc.) in a plurality of upper and lower stages, and 2 is objects to be dried X, X. A storage chamber 3 for accommodating two carriages 1 and 1 on which'is mounted side by side on one side and another side on the other side of the room is a forward / reverse switchable fan for ventilation drying. When the rolling operation is performed, the drying air A is passed from one side of the storage chamber 2 to the other side as indicated by the solid line arrow in the figure, and when the reverse operation is performed, the drying chamber A of the storage chamber 2 is changed as indicated by the dashed arrow in the figure. The drying air A is ventilated from the other side to the one side.

Numerals 4 and 5 open the outside air ports 6 and 7 in the posture shown by the one-dot chain line in the figure and close the circulation air passage to the dehumidifier 8, and the posture shown by the solid line in the figure, on the contrary, It is a damper that switches the air passage to a circulating air ventilation state in which the mouths 6 and 7 are closed and the circulation air passage to the dehumidifier 8 is opened. In a situation where the drying process by ventilation of the outside air OA can be performed, the dampers 4 and 5 are set to the outside air ventilation state. By operating the fan 3 in the normal direction, the outside air OA taken in from the outside air outlet 6 on the upper side is used as the drying air A on one side of the storage chamber 2 (right side in the figure).
From outside to outside while discharging the outside air OA from the outside through the outside air outlet 7 on the lower side, and by operating the fans 3 in the reverse direction with the dampers 4 and 5 in the outside air ventilation state. , The other side of the storage chamber 2 (the left side in the figure) using the outside air OA taken in from the lower outside air port 7 as the drying air A.
The outside air OA after the ventilation is exhausted to the outside through the outside air outlet 6 on the upper side, and automatically alternates with the outside air OA, whereby the outside air OA is transferred to the indoor drying object X, Dry the X '.

In a situation where the outside air OA cannot be dried by ventilation, the air blown by the dehumidifier 8 is stored as the drying air A by operating the fan 3 in the normal direction with the dampers 4 and 5 in a circulating ventilation state. Ventilation from one side (right side in the figure) of the chamber 2 to the other side, and normal circulation operation in which the air after ventilation is returned to the dehumidifier 8 and rotation of the fans 4 in the same manner with the dampers 4 and 5 operating in reverse. As a result, the air dehumidified by the dehumidifier 8 is used as the drying air A on the other side of the storage chamber 2 (on the left side in the drawing).
From one side to the other side, and automatically reciprocating the circulation ventilation to return the air after ventilation to the dehumidifier 8 is alternately carried out, whereby the dehumidifier 8 is used to force the indoor drying objects X and X '. Dry it.

Reference numeral 9 denotes a controller for automatically switching the forward / reverse rotation of the fan 3 in each of the outside air ventilation state and the circulating ventilation state, after the forward rotation operation of the fan 3 is continued for a first set time T1. The fan 3 is switched to the reverse rotation operation state, and the reverse rotation operation of the fan 3 is changed to the second set time T2.
After that, the fan 3 is switched to the normal rotation operation mode again, and the fan normal rotation operation for the first set time T1 and the fan reverse rotation operation for the second set time T2 are repeated.

The dehumidifier 8 has an indoor evaporator 8a for cooling and dehumidifying the air returned from the storage chamber 2, an indoor condenser 8b for reheating the cooled and dehumidified air, and an outdoor condensation for radiating the outside air OA. And a heating and dehumidifying mode in which the entire amount of refrigerant condensation is performed in the indoor condenser 8b to increase the amount of reheat, and a part of the refrigerant condensation is condensed outdoors. The cooling and dehumidifying mode in which the amount of reheat by the indoor condenser 8b is reduced to be performed by the vessel 8c can be selectively performed, and the operation mode is set to keep the storage chamber 2 at a predetermined drying processing temperature. The heating / dehumidifying mode and the cooling / dehumidifying mode are automatically switched based on the temperature detection of item 2.

Reference numeral 9a is a setting device for automatically setting the first set time T1 and the second set time T2 at the start of the drying process. As a concrete setting mode, first, each trolley 1 , 1 ', the weight sensor 10 mounted on the lower part of the storage chamber 2 accommodates the object X to be stored and dried in the carriage 1 (that is, the object to be dried to the one side which is on the windward side during the normal fan operation). The actual weight W1 of the object X),
And, the actual weight W2 of the object to be stored and dried X '(that is, the object to be dried X'toward the other side which is on the windward side during the fan reverse rotation operation) in the carriage 1'positioned on the other side of the storage chamber 2 is measured. Then, the finish weights Xm1 and Xm2 of each of the one-side drying object X and the other-side drying object X'which are manually set by the separate designating device 11 (that is, the desired moisture content is reduced to a predetermined value are desired). Based on the expected weights of the object X to be dried on one side and the object X'to be dried on the other side when the finished dry state is obtained, the object X to be dried on one side X
Difference ΔW between the measured actual weight W1 and the set finished weight Wm1
1 (= W1-Wm1) is calculated as the drying load of the drying target X on one side, and the drying target X'on the other side is calculated.
Difference ΔW between the measured actual weight W2 and the set finish weight Wm2
2 (= W2-Wm2) is calculated as the drying load of the object X to be dried on the other side.

Further, the ventilation amount Q per unit time is caused by the difference in the ventilation path between the normal rotation operation and the reverse rotation operation of the fan.
1 (during forward rotation) and Q2 (during reverse rotation) differ, whereas the ventilation volume ratio Q1: Q2 = 1:
K is stored in advance, and the calculated weight differences ΔW1 and ΔW2 and the stored ventilation volume ratio Q1: Q2 = 1: K.
Based on the above, each set time is set so that the ratio of the first set time T1 and the second set time T2 becomes a value represented by the following equation (a), T1: T2 = K · ΔW1: ΔW2 (b). T1 and T2 are automatically set.

That is, the measured actual weight W of the object X to be dried, which is closer to one side, is added while correcting for the difference in the ventilation amounts Q1 and Q2 per unit time between the forward rotation operation and the reverse rotation operation.
1, the difference ΔW1 between the set weight Wm1 and the set finish weight Wm1 (drying load toward one side), the difference ΔW2 (drying load toward the other side) between the measured actual weight W2 of the object X ′ to be dried toward the other side and the set finish weight Wm2 The larger the value, the larger the ratio of the operation time T2 of the reverse flow ventilation operation in the automatic switching between the forward rotation ventilation operation and the reverse rotation ventilation operation as shown in FIG. The difference ΔW2 between the weight W2 and the set finish weight Wm2 (dry load toward the other side), the difference ΔW1 (dry load toward the side) between the measured actual weight W1 of the object X to be dried near the one side and the set finish weight Wm1. As shown in FIG. 3, the larger the value is, the larger the ratio of the operation time T1 of the forward rotation ventilation operation in the automatic switching between the forward rotation ventilation operation and the reverse rotation ventilation operation is.
The operating time ratio T1: T2 between the normal rotation ventilation operation and the reverse rotation ventilation operation is automatically set according to the ratio of 1) to the other side dry load (ΔW2).

In the above time setting, one cycle time (T1 + T2) of the fan forward rotation operation and the fan reverse rotation operation is constant, and the ratio of each set time T1 and T2 is equal to the value expressed by the above equation (a). The setting time T1 or T2 is determined so that one of the setting times T1 and T2 is a fixed value, and the ratio of the setting times T1 and T2 is a value represented by the formula (a). Any of the forms for determining the other set time so that

(Second Embodiment) Next, a second embodiment of the present invention will be described.

In the same dryer configuration (FIG. 4) as the dryer shown in the first embodiment, the first set time T1 and the second set time
To configure the setter 9a that automatically sets the set time T2, the following setting form is adopted.

First, the weight sensor 10 mounted on the lower portion of each carriage 1, 1'is used to store and dry the object X to be accommodated and dried in the carriage 1 located at one side of the storage chamber 2 (that is, when the fan is rotating forward). The object to be dried on the upper side, X)
Of the actual weight W1 and the object X'to be stored and dried in the carriage 1'positioned on the other side of the storage chamber 2 (that is, the object X'to be dried on the other side which is on the windward side during the fan reverse operation). Each of the actual weights W2 is measured.

Further, the ventilation amount Q per unit time is caused by the difference in the ventilation path between the normal rotation operation and the reverse rotation operation of the fan.
1 (during forward rotation) and Q2 (during reverse rotation) differ, whereas the ventilation volume ratio Q1: Q2 = 1:
K is stored in advance, and the measured actual weight W is
1, W2 and the stored ventilation volume ratio Q1: Q2 = 1: K, the ratio of the first set time T1 and the second set time T2 is expressed by the following equation (B), T1: T2 = K · W1: W2 ... (B) is set such that the set times T1 and T2 are automatically set so as to have the values indicated by.

That is, as a simplified setting control in the case where the initial moisture contents of the one-side drying object X and the other-side drying object X ′ stored in the storage chamber 2 are equal or almost equal, While adding a correction for the difference in the air flow rates Q1 and Q2 per unit time between the rolling operation and the reverse operation, the measured actual weight W1 of the drying object X closer to one side with respect to the drying target X ′ toward the other side. The larger the measured actual weight W2 of
Similarly to the case shown in FIG. 2 described above, the ratio of the operation time T2 of the reverse rotation ventilation operation in the automatic switching between the forward rotation ventilation operation and the reverse rotation ventilation operation is increased, and conversely, the drying target X ′ of the other side is reduced. One side of the measured actual weight W2 to be dried X
The larger the measured actual weight W1 is, the larger the ratio of the operation time T1 of the forward rotation ventilation operation in the automatic switching between the forward rotation ventilation operation and the reverse rotation ventilation operation, as in the case shown in FIG. It is set to automatically set the operating time ratio T1: T2 between the forward rotation ventilation operation and the reverse rotation ventilation operation in accordance with the actual weight ratio W1: W2 of the one-side drying object X and the other-side drying object X '. It constitutes the container 9a.

In the above time setting, the above-mentioned first
Similar to the embodiment, the one cycle time (T1 + T2) of the fan normal rotation operation and the fan reverse rotation operation is constant, and the set times T1 and T2 are set.
Of the set times T1 and T2 so that the ratio of the two becomes a value represented by the formula (B), or both set times T
Either one of T1 and T2 is a fixed value, and any one of the modes in which the other set time is determined so that the ratio of the respective set times T1 and T2 becomes the value shown by the formula (B) is adopted. Good.

[Other Embodiments] Next, other embodiments will be listed.

(1) As in the case where K = 1 in the above-mentioned first and second embodiments, the operating time ratio T1: T2 between the normal rotation ventilation operation and the reverse rotation ventilation operation is set to one side drying. Load ΔW1 (difference between the actual weight W1 of the object X to be dried on one side and the set finish weight Wm1) and the drying load ΔW on the other side
2 (the difference between the actual weight W2 of the object X ′ to be dried on the other side and the set finished weight Wm2) ΔW1: ΔW2, or the object X to be dried on one side and the object to be dried X ′ on the other side. To the actual weight ratio W1: W2 of (T1: T
2 = ΔW1: ΔW2, or T1: T2 = W1: W
2) Instead of setting the operating time ratio T1: T2 as described above, for example, each operating time [T1 = TO (constant) + t
1, T2 = TO (constant) + t2], the ratio t1: t2 of the correction time portions t1 and t2 is equal to the dry load ratio ΔW1: ΔW2 and the actual weight ratio W1: W2 (t
1: t2 = ΔW1: ΔW2, or t1: t2 = W
1: W2) may be adopted to set the operating time ratio T1: T2 between the normal rotation ventilation operation and the reverse rotation ventilation operation, that is, the one side dry load ΔW1 and the other side dry load. Depending on the ratio to ΔW2, or the actual weight ratio W1: W2 of the object X to be dried on one side and the object X'to be dried on the other side.
Accordingly, various improvements can be made to the specific setting mode in automatically setting the operating time ratio T1: T2 between the normal rotation ventilation operation and the reverse rotation ventilation operation.

(2) Only in the initial stage of the drying operation, depending on the ratio of the drying load ΔW1 on one side to the drying load ΔW2 on the other side,
Alternatively, the operation time ratio T1: T2 between the forward rotation ventilation operation and the reverse rotation ventilation operation is automatically set according to the actual weight ratio W1: W2 of the one-side-side drying object X and the other-side-side drying object X ′. Instead of the form, depending on the ratio of the one-side drying load ΔW1 and the other-side drying load ΔW2 during the drying operation, or the actual weight of the one-side drying target X and the other-side drying target X ′. A mode may be adopted in which the operating time ratio T1: T2 between the normal rotation ventilation operation and the reverse rotation ventilation operation is automatically changed according to the ratio W1: W2.

(3) Depending on the ratio between the one-side drying load ΔW1 and the other-side drying load ΔW2, or the actual weight ratio W of the one-side drying object X and the other-side drying object X '.
1: The operation time ratio T1: T2 between the normal rotation ventilation operation and the reverse rotation ventilation operation is automatically set according to W2, whereas the subsequent one side dry object X and the other side dry object X are set. Based on the respective progress of drying (for example, the ratio of the weight reduction rate of the object X to be dried on one side to the weight reduction rate of the object X to be dried on the other side), the normal rotation ventilation operation and the reverse rotation ventilation operation are performed. A mode in which the time ratio T1: T2 is corrected may be adopted.

(4) With respect to the objects X and X'to be dried, various crops and articles including the radish as a raw material of the shredded radish can be objects to be dried.

(5) Actual weight W of the object X to be dried on one side
1, and the means for measuring the actual weight W2 of the object X'to be dried toward the other side is replaced by the weight sensor 10 mounted on the lower part of the truck 1 or 1'as in each of the above-described embodiments, and various measuring modes can be used. You can adopt one.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a dryer according to a first embodiment.

FIG. 2 is a graph showing an example of a time ratio setting between normal rotation ventilation operation and reverse rotation ventilation operation.

FIG. 3 is a graph showing another example of setting the time ratio between the normal rotation ventilation operation and the reverse rotation ventilation operation.

FIG. 4 is a configuration diagram of a dryer according to a second embodiment.

FIG. 5 is a graph showing a time ratio setting of a conventional normal rotation ventilation operation and a reverse rotation ventilation operation.

[Explanation of symbols]

 2 Storage chamber 9a Setting means A Drying air T1 Operating time T2 Operating time W1 Actual weight W2 Actual weight Wm1 Set finished weight Wm2 Set finished weight ΔW1 Difference (drying load) ΔW2 Difference (drying load) X Drying target X ′ Drying target object

Claims (2)

[Claims] 1. A normal rotation ventilation operation for ventilating a drying air (A) from one side of a storage chamber (2) storing the objects to be dried (X), (X ′) to the other side, and the storage chamber (2). 2) A dryer that automatically switches between reverse air flow operation in which drying air (A) is blown from the other side to one side every predetermined time, and is located near the one side of the storage chamber (2). Actual weight (W1) and set finish weight (Wm1) of object to be dried (X)
Is set to the drying load (ΔW1) on one side, and the actual weight (W) of the object to be dried (X ′) located on the other side is set.
The difference between 2) and the set weight (Wm2) is defined as the drying load (ΔW2) closer to the other side, and the drying load (Δ) closer to the one side.
W1) and the dry load toward the other side (ΔW2) according to the ratio, the operating time ratio between the normal rotation ventilation operation and the reverse rotation ventilation operation (T1: T2)
A dryer provided with a setting means (9a) for automatically setting. 2. A normal rotation ventilation operation in which the drying air (A) is passed from one side of the storage chamber (2) storing the objects to be dried (X), (X ′) to the other side, and the storage chamber (2). 2) A dryer that automatically switches between reverse air flow operation in which drying air (A) is blown from the other side to one side every predetermined time, and is located near the one side of the storage chamber (2). According to the ratio of the actual weight (W1) of the object to be dried (W1) and the actual weight (W2) of the object to be dried (X ') located on the other side, the normal rotation ventilation operation and the reverse rotation ventilation operation are performed. Operating time ratio (T1: T
A dryer provided with setting means (9a) for automatically setting 2).