JPH072886U - Dehumidifying dryer - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a dehumidifying dryer which has a simple structure and can suppress an increase in running cost while achieving high drying efficiency even in use in winter and in cold regions. A heat pump type air conditioner B having a heat exchanger 18 for receiving the outside air as a heat receiving target, and the outside air for the air conditioner B
And the temperature sensor 29 for detecting the outside air temperature, and the temperature detected by the temperature sensor 29 is equal to or higher than the set value. Operating the air conditioner B, and
In the dehumidification dryer controlled to stop the operation of the air conditioner B when the detected temperature is equal to or lower than the set value, the heater 33 that heats the air supplied to the drying unit A by the blower fans 16 and 19 is provided. When the temperature detected by the temperature sensor 29 is equal to or higher than the set value, the operation of the heater 33 is stopped, and when the temperature is equal to or lower than the set value, the heater 33 is heated.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a heat pump type air conditioner having a heat exchanger that receives heat from the outside air, and ventilation means for passing the outside air through the air conditioner to a drying section in which an object to be dried is stored. A temperature detecting means for detecting the outside air temperature, and if the temperature detected by the temperature detecting means is above a set value, the air conditioner is operated, and if the detected temperature is below the set value, the air conditioner The present invention relates to a dehumidifying / drying machine provided with a control means for controlling so as to stop the driving operation.

[0002]

[Prior art]

 In the above dehumidifying / drying machine, conventionally, a heater is provided in the air passage that is ventilated toward the drying section by the ventilation means, and a dedicated temperature sensor for detecting the ventilation temperature is provided near the heater. In some cases, the heater is heated when the temperature detected by the temperature sensor falls below a preset temperature.

[0003]

[Problems to be solved by the device]

 With the above structure, when the outside temperature of the heat pump type air conditioner is low, dew condensation may occur and dehumidification efficiency may decrease. When the temperature falls below the set temperature, the operation is controlled to automatically stop.If the outside air temperature falls below the set temperature, the drying process is performed in the drying section only by the ventilation of the outside air by the ventilation means. Since it may take a long time to reach a predetermined degree of dryness in the drying process only with such ventilation operation, a heater is provided in the air passage that is ventilated toward the drying section, and ventilation is performed. The temperature is raised so as to achieve dehumidification due to the temperature rise. However, with the above-mentioned conventional structure, since the heater on / off control is performed based on the temperature detected by a dedicated temperature sensor, there is the drawback that the number of parts increases and the structure becomes complicated. If the temperature is different from the set temperature for turning on / off the air conditioner operation, the air conditioner operation and the heater heating operation are performed at the same time, which lowers the operation efficiency and increases the running cost. was there. The present invention aims to solve the above-mentioned problems.

[0004]

[Means for Solving the Problems]

 A characteristic configuration of the present invention is that in the dehumidifying dryer described at the beginning, a heater for heating the air supplied to the drying unit by the ventilation unit is provided, and the control unit controls the temperature detected by the temperature detection unit. If is above the set value, the operation of the heater is stopped, and if the detected temperature is below the set value, the heater is controlled to be heated.

[0005]

[Action]

 If the temperature of the outside air detected by the temperature detecting means is equal to or higher than the set temperature, the air conditioner is operated and the heater is stopped, so that the outside air is ventilated through the heat exchanger in the air conditioner. The drying air is ventilated to the drying section, and the air-conditioning unit performs the drying operation. When the outside air temperature is lower than the set temperature, the operation of the air conditioner is stopped and the heater is heated, so that the drying time does not become long even when used at low temperatures. . Moreover, there is no adverse effect such that the air conditioner and the heater operate simultaneously and the operating efficiency decreases.

[0006]

[Effect of device]

 Therefore, in order to suppress the occurrence of dew condensation and the running cost, the detection information of the outside air temperature detecting means provided for the switching control of the operating state of the air conditioner is effectively used to reduce the drying efficiency at low temperature. It is possible to provide a dehumidifying dryer that has a simple structure and can suppress an increase in running cost while achieving high drying efficiency even in winter and in cold regions. It was

[0007]

Embodiment An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a grain drying section A and an air conditioner B are connected via a ventilation duct 1 to form a dehumidifying dryer for drying treatment of grains. In the grain drying section A, a storage space SP for storing and drying the grains is secured, and a plurality of ventilation paths 2 are provided so as to laterally traverse the storage space SP. In the storage space SP, the grains supplied little by little from the upper leveling device 3 and the grains discharged little by little by driving the rotary valve 5 from the gap between the lower sloping plate 4 are balanced, and the grains are balanced. As a whole, while maintaining a level higher than the uppermost ventilation passage 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 to the storage space SP, and is connected to the exhaust frame 2b to store the storage space SP. Some of them are for sucking air from the inside, and they are all formed in the grain by a mountain-shaped frame with an open bottom.

In the grain drying unit A, the grain discharged from the storage space SP is returned to the storage space SP again to circulate the grain and perform tempering drying. That is, the grains discharged from the storage space SP by the intermittent drive of the rotary valve 5 at appropriate intervals are conveyed laterally to one side by the lower screw 6, and the conveyed grains are lifted upward by the elevator 7. The conveyed grains are conveyed to the upper center by the upper screw 8, and the conveyed grains are evenly diffused into the storage space SP by the equalizer 3. In the figure, 9 is a full scale for detecting the height level of grains in the storage space SP, and 10 is an exhaust blower for sucking the humid air in the storage space SP to the outside by inhaling the exhaust frame 2b. , 11 is a dust removing device for discharging dust floating in the storage space SP to the outside, 12 is a hopper for supplying grains to the grain dryer A, 13 is water content of the grains The single-grain moisture meter 14 for performing the operation is a control device that controls the entire device. The arrow indicates the flow of air.

The air conditioner B has two upper and lower ventilation passages, and the first ventilation passage 17 on the upper side is provided with a condenser 15 and a first ventilation fan 16 as ventilation means. The lower second ventilation passage 20 is provided with an evaporator 18 as a heat exchanger for receiving the outside air as a heat receiving target and a second blower fan 19 as a ventilation means. Reference numeral 27 is a compressor, which circulates a refrigerant through the condenser 15 and the evaporator 18 to form a heat pump. The outlet 21 of the first ventilation passage 17 is fitted and connected to the ventilation duct 1, and the outlet 22 of the second ventilation passage 20 communicates with the outside to connect the first ventilation passage 17 and the second ventilation passage 20. Communicate with each other through the vent hole 23. The ventilation port 23 and the exhaust port 22 are provided with first and second dampers 24 and 25 as adjusting means for adjusting the amount of air flowing from the second ventilation passage 20 to the first ventilation passage 17. The first and second dampers 24 and 25 are configured to be opened and closed simultaneously and contrariwise by driving one electric motor 26. That is, when the first damper 24 is fully closed, the second damper 25 is fully open, and all the air that has been cooled and dehumidified by the evaporator 18 is added to the first ventilation passage through the ventilation hole 23. Therefore, the air dehumidified at room temperature is sent to the ventilation duct 1. On the other hand, when the first damper 24 is fully opened, the second damper 25 is fully closed, and all the air dehumidified by the evaporator 18 is discharged to the outside, and the ventilation duct 1 is heated by the capacitor 15. Only air is sent.

A control means 28 is provided above the air conditioner B, and a temperature sensor 29 (an example of temperature detection means) for detecting the dry-bulb temperature of the outside air and a humidity of the outside air are provided near the suction part of the outside air. A humidity sensor 30 for detecting is provided. Based on the detection information from these two sensors 29 and 30, the control means 28 performs on-off control of the first and second blower fans 16 and 19 and the compressor 27 as described below, and each damper 24, Open / close control of 25. Further, a heater 33 for heating the air supplied to the grain drying section A by each of the blower fans 16 and 19 is provided in the air passage of the ventilation duct 1, and the heater 33 is also operated by the control means 28. Is configured to control.

As shown in the psychrometric chart of FIG. 2, a region where the dry-bulb temperature is 25 ° C. to 38 ° C. and the relative humidity is 40% to 50% is a target setting region that represents air suitable for drying grains. Defined as TA. Then, the outside air is divided into five areas according to the dry-bulb temperature and the relative humidity, dehumidification and heating are performed according to each area, and the air is sent to the grain dryer A after being as close to the target setting area TA as possible. To control. A description will be added below for each area. The dehumidifying area HA is an area in which the relative humidity exceeds 60% and the dry-bulb temperature exceeds 22 ° C. and 38 ° C. or less, and can be brought close to the target setting area TA by normal temperature dehumidification. Therefore, the air that has been cooled and dehumidified by the evaporator 18 is mixed with the air that has been heated by the condenser 15 to obtain room temperature dehumidified air. In this case, the compressor 27 and the blower fans 16 and 19 are both operated. The first damper 24 is closed and the second damper 25 is open. The heating area CA is an area in which the relative humidity exceeds 60% and the dry-bulb temperature is from 8 ° C to 22 ° C, and can be brought close to the target setting area TA by heating. Therefore, only the air heated by the condenser 15 is sent to the grain drying section A. In this case, the compressor 27 and the blower fans 16 and 19 are both operated, but the first damper 24 is opened and the second damper 25 is closed. The blast area BA includes a target setting area TA, is an area excluding the dehumidifying area HA and the heating area CA, and is an area having a dry-bulb temperature of 8 ° C. or higher. When the outside air is in this area, only the air is blown by the blower fans 16 and 19 without dehumidifying or heating. In this case, the compressor 27 is stopped, so that the evaporator 18 does not perform cooling and dehumidifying and the condenser 15 does not heat. It does not matter which of the dampers 24 and 25 is open (the other is closed). When the dry-bulb temperature is 8 ° C. or lower, the heater temperature range DA is reached, the compressor 27 is stopped and only the air is blown by the blower fans 16 and 19 without performing dehumidification and heating. 33 is activated by heating.

FIG. 3 shows a flow of determining the above area division. In the figure, T represents the dry-bulb temperature of the outside air, and RH represents the relative humidity of the outside air. Further, ON / OFF control of the compressor 27, the blower fans 16 and 19, the dampers 24 and 25, and the heater 33 in each region is shown in a matrix table as shown in FIG. In the figure, ON of the damper means that the first damper 24 is in the closed state and the second damper 25 is in the open state, and OFF means the opposite, and it does not matter which of the bars is in the open state (the other is in the closed state). It means that. The controller 14 of the grain drying unit A constantly checks the temperature of the grain with the grain temperature sensor 31 fixed to the lower inclined plate 4 inside the dryer, and when the temperature of the grain rises abnormally, Turn on the alarm lamp (not shown).

It should be noted that reference numerals are added to the claims of the utility model to facilitate comparison with the drawings, but the invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a simplified side view of a dehumidifying dryer.

[Figure 2] Pneumatic diagram

FIG. 3 is a control flowchart.

[Figure 4] Matrix table

[Explanation of symbols]

 16, 19 Ventilation means 18 Heat exchanger 28 Control means 29 Temperature detection means 33 Heater A Drying section B Air conditioner

Claims (1)

[Scope of utility model registration request] 1. A heat exchanger (18) which receives heat from outside air.
A heat pump type air conditioner (B), and ventilation means (16) for passing outside air through the air conditioner (B) toward the drying section (A) in which the object to be dried is stored,
(19) and temperature detecting means (29) for detecting the outside air temperature
If the temperature detected by the temperature detecting means (29) is equal to or higher than a set value, the air conditioner (B) is operated, and if the detected temperature is equal to or lower than the set value, the air conditioner (B) is operated. A dehumidifying / drying machine provided with a control means (28) for controlling so as to stop the operation, wherein the drying section (A) includes the ventilation means (16) and (19).
A heater (33) for heating air supplied to the heater is provided, and the control means (28) operates the heater (33) if the temperature detected by the temperature detection means (29) is equal to or higher than the set value. And a dehumidifying dryer configured to control the heater (33) to be heated when the detected temperature is equal to or lower than the set value.