JP4054724B2 - Method and apparatus for stably supplying air for dryer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and apparatus for supplying air for drying treatment to dryers for agricultural and marine products and various articles.
[0002]
[Prior art]
The air supply device for the dryer is equipped with a refrigerant evaporator and a condenser. The evaporator cools and dehumidifies the air taken in, and the condenser heats the air and mixes these two airs. In some cases, dry air is fed into a dryer. Conventionally, as a drying / storage device, in addition to supplying the above-mentioned mixed air for drying, a switching type supply device that supplies air from only an evaporator for storage has been proposed (for example, Patent Document 1). Furthermore, in the dewatering apparatus indispensable at the time of manufacture of washing rice represented by the patent No. 2615314 related to the present applicant, the drying hot air used in the drying section is transferred between the drying section and the dehumidifying dryer. The thing which used it cyclically is proposed (for example, refer patent document 2).
[0003]
[Patent Document 1]
JP-A-6-82121 (page 1-6)
[Patent Document 2]
JP 2002-204964 (page 1-7)
[0004]
[Problems to be solved by the invention]
However, in the dry air supply apparatus including the evaporator and the condenser as described above, when the temperature of the atmosphere becomes a low temperature of about 15 ° C. or less, for example, frost is generated in the evaporator and the apparatus becomes inoperable. There is a problem. For this reason, conventionally, a defrosting device or the like is additionally provided, or the evaporator is switched to a condenser by flowing the refrigerant in the reverse direction, and the generated frost is sequentially removed to continue the operation. .
[0005]
In view of these points, the present invention provides a dryer air that can stably produce a drying air even when the atmosphere is at a low temperature, without the need for a defrosting device or the like, or a reverse operation of the refrigerant. It is in providing the supply method and its apparatus. It is another object of the present invention to provide an air supply method for a dryer and an apparatus thereof that are simple in configuration, can be implemented at low cost, and are energy efficient.
[0006]
[Means for Solving the Problems]
The technical means of the method for stably supplying air for a dryer according to the present invention introduces the atmosphere into the refrigerant condenser and the evaporator when the ambient atmospheric temperature is high and no frost is generated in the refrigerant evaporator. When the high temperature air heated by the condenser and the air cooled and dehumidified by the evaporator are mixed and supplied to the dryer, on the other hand, when the ambient air temperature is low and frost is generated in the evaporator, Exhaust from the dryer is introduced into the evaporator, and this exhaust heat is used to prevent frost generation in the evaporator and to continue operation . The exhaust through the evaporator is discharged to the outside, In addition, by introducing air to the condenser and heating it, stable heated air is supplied to the dryer.
[0007]
Further, the technical means of the apparatus for stably supplying air for a dryer of the present invention includes a refrigerant condenser for heating the introduced air, a refrigerant evaporator for cooling and dehumidifying the introduced air, and an evaporator. A switching valve that switches the air to be introduced to the atmosphere and exhaust from the dryer, an exhaust pipe that connects the switching valve and the dryer, and a flow path of air that has passed through the evaporator to the dryer or exhaust Switch the switch valve and switch according to the atmospheric temperature, and when the atmospheric temperature is high, introduce the atmosphere into the condenser and the evaporator, and the high-temperature air heated by the condenser The air cooled and dehumidified by the evaporator is mixed and supplied to the dryer. When the atmospheric temperature is low, the exhaust from the dryer is introduced into the evaporator, and the exhaust through the evaporator is discharged to the outside. The air is introduced into the condenser and heated to dry the stable heated air. It lies in the fact that is for the supply to.
[0008]
It is also possible to attach a control device having a temperature sensor and issue an instruction from the control device according to the temperature of the atmosphere to switch between the switching valve and the switch. Further, the interior of the air supply device is divided into a condenser chamber, an evaporator chamber, and a flow path switching chamber, and the flow path switching chamber is provided with an opening that communicates with the outside and the condenser chamber. In addition, a switch is attached to each opening. Whether the air sent from the evaporator chamber to the flow path switching chamber is exhausted or sent to the condenser chamber by switching the opening and closing of both switches. It is also possible to select. Furthermore, a blower is attached to each of the condenser chamber and the evaporator chamber, and the air sucked from the evaporator chamber is discharged to the flow path switching chamber, and the air sucked from the condenser chamber is supplied to the dryer. It is also possible to send it.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of an air supply method and apparatus for a dryer according to the present invention will be described based on examples of the drawings. FIG. 1 shows an outline of the air supply device 1. The air supply device 1 has a condenser 2 and an evaporator 3 to which a refrigerant is sent. In FIG. 1, the refrigerant pipe 4 is indicated by a dotted line. That is, the refrigerant that has been liquefied by high pressure and high temperature in the compressor 5 is sent to the condenser 2, heat exchange is performed by the air passing therethrough, the refrigerant is cooled, and further liquefaction proceeds.
[0010]
The liquefied refrigerant in the condenser 2 is then sent to the expansion valve 6, where it is rapidly cooled by adiabatic expansion, and further sent to the evaporator 3 to be vaporized, whereby the heat exchanger of the evaporator 3 is sent. Cool down. The atmosphere passing through the heat exchanger and the exhaust from the dryer are cooled by heat exchange, and moisture contained in the air is condensed and removed. The refrigerant that has left the evaporator 3 returns to the compressor 5, is compressed, is again heated to a high pressure and is sent to the condenser 2.
[0011]
The casing of the air supply device 1 is divided into a condenser chamber 7, an evaporator chamber 8, and a flow path switching chamber 9. The evaporator chamber 8 is provided with a blower 10 that sucks air from the room and forcibly sends it out to the flow path switching chamber 9. The flow path switching chamber 9 is provided with an opening communicating with the outside and an opening communicating with the condenser chamber 7, and switches 11 and 12 such as dampers are attached to the respective openings. Further, a control device 13 is connected to the switches 11 and 12, and the switches 11 and 12 are opened and closed according to the value of a temperature sensor built in the control device 13, and air is sent from the flow path switching chamber 9. The direction can be switched. Further, the condenser chamber 7 is provided with a blower 14 which sucks air from the room and forcibly sends it out to the dryer 20.
[0012]
Next, an air supply system to the dryer 20 will be described with reference to FIGS. Note that a switching valve 15 is provided at the air inlet to the evaporator chamber 8 so that the air fed into the evaporator chamber 8 can be switched between the atmosphere and the exhaust from the dryer. First, when the atmospheric temperature around the apparatus is higher than about 15 ° C. and no frost is generated in the evaporator 3, the switching valve 15 is switched to the atmosphere as shown in FIG. Switch 11 is closed and switch 12 is opened. As a result, the atmosphere flows into the evaporator 3, is cooled and dehumidified, is sent to the flow path switching chamber 9 by the blower 10, and flows into the condenser chamber 7 through the switch 12. In addition, the atmosphere flows into the condenser 2 and is heated. Then, the cooling dehumidified air and the heated air are mixed in the condenser chamber 7 to become dry air having an extremely low humidity, which is normal temperature or slightly higher than normal temperature, and is sent to the dryer 20 by the blower 14.
[0013]
In the dryer 20, the agricultural and marine products and various articles in the machine are dried by the fed drying air. The air exiting the dryer 20 is sent to the dust remover 21 to remove dust and the like from the object to be dried contained in the air. The air exiting the dust remover 21 is discharged to the outside by the blower 22 through the exhaust pipe 23.
[0014]
Next, when the ambient air temperature is as low as about 15 ° C. or less and frost is generated in the evaporator 3, the changeover valve 15 is moved from the dryer as shown in FIG. Is switched to the exhaust direction, and the switch 11 is opened and the switch 12 is closed. Thereby, a part or all of the exhaust from the exhaust pipe 23 flows into the evaporator 3. Although this exhaust gas has passed through the dryer 20 and the like, the temperature is still a little high so that no frost is generated in the evaporator 3. That is, by using the exhaust heat from the dryer 20, frost generation in the evaporator 3 is prevented, so that the energy efficiency of the entire system including the air supply device 1 and the dryer 20 can be greatly increased. it can.
[0015]
The air that has passed through the evaporator 3 is sent to the flow path switching chamber 9 by the blower 10 and is discharged to the outside through the open switch 11. The outlet of the switch 11 is connected to the exhaust pipe 23. On the other hand, since the switch 12 is closed in the condenser chamber 7, only the dry air heated through the condenser 2 is sent to the dryer 20 by the blower 14. The drying operation can be performed only with heated air.
[0016]
As described above, when the ambient air temperature is high or low, the operation mode is switched, and when the temperature is high and frost is not generated in the evaporator, the atmosphere is introduced into the evaporator, and the cooled and dehumidified air and the condenser are installed. The heated and mixed air is mixed and supplied to the dryer. On the other hand, when the ambient temperature is low and frost is generated in the evaporator, the warm exhaust through the dryer is introduced into the evaporator. Thus, while continuing the operation, only the heated air that has passed through the condenser is sent to the dryer. For this reason, even when the temperature is low, it is possible to execute the operation of the dryer with the dry air generated by the heat of the condenser, and it is the exhaust from the dryer that is sent to the evaporator, and a separate defroster or Since reverse operation of the refrigerant is unnecessary, the configuration is simple, it can be implemented at low cost, and it is excellent in energy efficiency. Further, the air supply device 1 can be provided with a heater (not shown). When the dryness of the dry air is insufficient, the heater is detected by a signal from a humidity sensor (not shown). To heat the air. Further, when the dry air is excessively dried, untreated air is appropriately mixed with the supply air to the dryer.
[0017]
The present invention is not limited to the above-described embodiments, and can be freely modified within the scope of the claims. In particular, the detailed configuration of the condenser and the evaporator is free. Furthermore, the configuration of the air supply device and the type of the switch are free. In the above embodiment, the switching temperature by the control device 13 is set to about 15 ° C., but this switching temperature can be changed depending on the ambient air conditions. Furthermore, regardless of the set temperature, the switching valve 15 and the switches 11 and 12 can be manually switched freely according to the presence or absence of frost formation in the evaporator and its prediction.
[0018]
【The invention's effect】
In the air supply method of the present invention, when the temperature is low, exhaust from the dryer is introduced into the evaporator and the heated air from the condenser is sent to the dryer. It is possible to perform the drying operation without attaching or operating the refrigerant in the reverse direction, and the waste heat from the dryer is used, so that energy efficiency can be improved. Furthermore, at low temperatures, the exhaust from the dryer is introduced into the evaporator, but the exhaust that passes through the evaporator is discharged to the outside and only the exhaust heat is used. By introducing air that does not have a rapid temperature fluctuation in a short time, it is possible to obtain a stable heated air that does not have a sudden temperature fluctuation, so that it is possible to stably supply the air for the dryer. .
[0019]
In addition, the air supply device of the present invention can obtain the above-described effects, and since it only switches the operation mode according to the temperature, it is easy to operate and can be implemented at low cost. Regardless of this, it is possible to perform a stable and energy-efficient drying operation.
[0020]
According to the third aspect, since the switching is performed by the control device having the temperature sensor, the drying operation can be completely automated.
[0022]
In the fourth aspect of the invention, the inside of the machine of the supply device is divided into three parts, and the flow path is switched by a switch, so that the space in the machine can be used effectively and the switching of the operation mode is simple. This can be done with a simple configuration.
[0023]
According to the fifth aspect of the present invention, since the air is moved by the blower, the structure is simple, and it can be implemented at low cost.
[Brief description of the drawings]
FIG. 1 is a diagram showing an outline of an air supply device.
FIG. 2 is a diagram showing an air supply state when the ambient atmosphere is hot.
FIG. 3 is a view showing an air supply state when the ambient air is at a low temperature.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Air supply apparatus 2 Condenser 3 Evaporator 4 Refrigerant piping 5 Compressor 6 Expansion valve 7 Condenser room 8 Evaporator room 9 Flow path switching chamber 10, 14 Blower 11, 12 Switch 13 Controller 15 Switching valve 20 Dryer 23 Exhaust pipe

Claims (5)

When the ambient air temperature is high and no frost is generated in the refrigerant evaporator, air is introduced into the refrigerant condenser and evaporator, and the dehumidified air is cooled and dehumidified by the evaporator. When the ambient air temperature is low and frost is generated in the evaporator, exhaust from the dryer is introduced into the evaporator and this exhaust heat is used. Then, frost generation in the evaporator is prevented and the operation is continued . Exhaust gas that passes through the evaporator is discharged to the outside, and air is introduced into the condenser and heated to stabilize it. A method for stably supplying air for a dryer, wherein heated air is supplied to the dryer. A refrigerant condenser for heating the introduced air, a refrigerant evaporator for cooling and dehumidifying the introduced air, and a switching valve for switching the air introduced into the evaporator between the atmosphere and the exhaust from the dryer ; It consists of an exhaust pipe that connects the switching valve and the dryer , and a switch that switches the flow path of the air that has passed through the evaporator to the dryer or to the exhaust. Switching , when the atmospheric temperature is high, introduce the atmosphere to the condenser and the evaporator, mix the high-temperature air heated by the condenser and the air cooled and dehumidified by the evaporator, and supply it to the dryer, When the atmospheric temperature is low, exhaust from the dryer is introduced into the evaporator, exhaust through the evaporator is discharged to the outside, and air is introduced into the condenser and heated, so that stable heated air is obtained. become so supplied to the dryer is, stable supply device of the air dryer A stable air for a dryer according to claim 2, wherein a control device having a temperature sensor is attached, and an instruction is issued from the control device to switch between the switching valve and the switch according to the temperature of the atmosphere. Feeding device. The interior of the air supply device is divided into a condenser chamber, an evaporator chamber, and a flow path switching chamber, the flow path switching chamber is provided with an opening that communicates with the outside and the condenser chamber, and A switch is attached to each opening. By switching the opening and closing of both switches, the air sent from the evaporator chamber to the flow path switching chamber is selected to be exhausted or sent to the condenser chamber. The stable supply apparatus of the air for dryers of Claim 2 or 3 which can be performed. A blower is attached to each of the condenser chamber and the evaporator chamber so that the air sucked from the evaporator chamber is discharged to the flow path switching chamber, and the air sucked from the condenser chamber can be sent to the dryer. The stable air supply device for a dryer according to claim 4, wherein

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