JPS61105091A - Drying method - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a drying method used for drying marine products such as seaweed, fish and shellfish, and general foods.

(Prior art) Conventionally, in this type of drying method, low-temperature and humid air from a drying chamber is first passed through a condenser in a refrigeration cycle and heated to become high-temperature and humid air, and then this is passed through a cooler. Drying is performed by dehumidifying the air to produce low-temperature, low-humidity air, passing it through a condenser and heating it to produce high-temperature, low-humidity air, and supplying this high-temperature, low-humidity air into the drying chamber.

(Problem to be solved by the invention) In the conventional drying method described above, the air from the drying chamber is heated in advance in a condenser before being dehumidified in a cooler, and the temperature difference between the temperature and the temperature at which the air is cooled by the cooler is greatly reduced. The feature is that the dehumidifying effect is improved by using only the refrigeration cycle, and the high temperature, low humidity air suitable for drying is obtained by heating it again in the condenser, but on the other hand, the supply of this high temperature, low humidity air is When the temperature inside the drying chamber increases, the air pressure in the drying chamber becomes higher than atmospheric pressure as the air in the drying chamber expands, which impedes the drying effect.

(Means for Solving the Problems) The present invention is based on the conventional drying method, but by performing drying under reduced pressure than in the past, more effective drying can be achieved. The purpose of the drying method of the present invention is to provide a method, and as a technical means to achieve this purpose, the drying method of the present invention forms an air circulation system path for circulating air between a drying chamber and an equipment room, and A heating condenser, a cooler, and a heating condenser are installed in the room in order from the inlet side, and an air circulation system outside P control condenser is installed to keep the temperature below the set temperature by the thermostat installed inside the drying room. In this case, install the heating condenser in the equipment room! and the cooler to supply high-temperature, low-humidity air into the drying room.
If the temperature is higher than the temperature set by the thermostat, only the cooler is operated in the equipment room to supply low-temperature, low-humidity air into the drying chamber, and when the heating condenser is activated, the temperature rise due to the supply of high-temperature, low-humidity air is detected. A configuration was adopted in which the expanded air was exhausted to the atmosphere via a one-way valve.

(Function) Therefore, in the drying method of the present invention, the drying effect associated with the conventional supply of high-temperature, low-humidity air can be obtained, and the expanded air caused by the temperature rise caused by supplying this high-temperature, low-humidity air can be transferred to the atmosphere. It prevents pressure rise inside the drying chamber and maintains the inside of the drying chamber at atmospheric pressure when supplying high-temperature, low-humidity air.
During the next supply of low-temperature, low-humidity air, the air inside the drying chamber contracts and the pressure inside the drying chamber is reduced, so the inside of the drying chamber is always maintained at below atmospheric pressure, and drying under this reduced pressure and drying with high-temperature, low-humidity air are performed. The synergistic action of these will result in effective drying.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a drying apparatus A for carrying out the drying method of this embodiment.

In the figure, 1 is a drying room and 2 is an equipment room.The equipment room 2 has a suction port 2a opened at the bottom of the drying room 1, and a discharge port 2b opened at the top of the drying room 1. Room 1
A ventilation path 5 partitioned by the partition plate 3 and the armor plate 4 is formed along the inner wall surface from the ceiling surface of the drying room 1, and the air from the drying room 1 is routed from the equipment room 2 through the ventilation path 5 and between the armor plates 4 again. The air circulation path that flows into the drying chamber 1 is sealed tightly from the outside air. In this case, each of the armor plates 4 is supported so that the direction can be freely changed, so that the direction of the wind and the amount of air can be adjusted. Reference numeral 6 designates a drive motor for the air blower 7 provided in the upper part of the equipment room 2, 8 represents an auxiliary fan, 9 represents a screen extended over the suction port 2a of the equipment room 2, and 10 represents a drain pan.

Next, FIG. 2 is a circuit explanatory diagram of a refrigeration cycle used in drying device A. In the figure, 11 is a compressor, 12 and 13
is a heating condenser, 14 is a control condenser, 15.1
5 is an expansion valve, 1 e, i 6 is a capillary tube, 17.17 is a cooler, 18 is an accumulator, 1
9 is a receiver, 20 and 21 are check valves, 22 and 23 are solenoid valves, and 24 is a switching valve for the cooler I Ll 7, so that when one cooler is operated, the other cooler is removed. I use a timer to alternately do this, such as frosting.

In this refrigeration cycle, the heating condenser 12.13 and the cooler 17.17 are inserted into the equipment room 2 from the suction port 2a side as shown in FIG. 17, the heating condenser 13, and the other equipment, namely the control condenser 14,
The compressor 11 and the like are installed outside the equipment room 2.

In addition, 25 is a thermostat installed in the drying chamber 1, and when the temperature in the drying chamber 1 is below the set temperature, one solenoid valve 22 is opened and the other solenoid valve 23 is closed to control the compression. The refrigerant (-high pressure gas) from the compressor 11 is allowed to flow into the heating condenser 12, 13, and if the temperature is below the set temperature, the solenoid valves 22 and 23 are switched to remove the high pressure gas from the compressor 11. This thermostat 25 and solenoid valves 22 and 23 are linked to allow the flow into the control condenser 14 side. In the embodiment, the temperature set by the thermostat 25 is set at 20'C to 25C to prevent protein denaturation and fat deterioration due to high temperatures in the fish and shellfish to be dried.

Reference numeral 26 designates a check valve as a one-way valve, the negative side of which communicates with the interior of the drying chamber 1, and the secondary side open to the atmosphere. Further, 27 is a drain pipe, and a check valve 28 is provided on the pipe 27.

Therefore, when drying marine products or the like using the drying apparatus A, first, the marine products are placed in the drying chamber 1. Then, when the compressor 11 is operated and operated in a refrigeration cycle of compressor 11 → heating condensers 12 and 13 → cooler 17 → compression rock 11, and when the blower 6 is operated, moisture inside the drying chamber 1 increases. low temperature and high humidity (2°C to 3°
Air (about 30°C) flows into the equipment room 2, where it is first heated by the heating condenser 12 to become high temperature and humid air (about 30°C), and then cooled by the cooler 17 and dehumidified. The air will be low temperature and low humidity (approximately 5°C). In this case, since the air passing through the cooler 17 is heated by the front heating condenser 12, there is a large temperature difference between the air and the cooling temperature of the cooler 17. This results in effective dehumidification. In addition, in the experimental example, when the heating condenser 12 was not used, the relative temperature was 40% or more, but in this example, it could be lowered to 35% or less, and the drying time was significantly shortened. was completed. The air that has passed through the cooler 17 and has become low temperature and low humidity is then transferred to a heating condenser 13.
heated again by high temperature 1 degree humidity (25℃~30℃)
This high-temperature, low-humidity air flows into the drying chamber 1 through the air passage 5 by the blower 6, where the moisture is removed from the material to be dried (1), and the same circulation as described above is repeated again. It is.

As drying is carried out in this way using high-temperature, low-humidity air, the temperature inside the drying chamber will rise.
In this case, in this drying apparatus A, when the temperature inside the drying chamber 1 exceeds the set temperature, the solenoid valve 23 is opened in conjunction with the thermostat 25, and the solenoid valve 22 is switched to close.
The heating condensers 12 and 13 are stopped, and low-temperature, low-humidity air is supplied into the drying chamber 1 through a refrigeration cycle consisting of the compressor 11 → control condenser 14 → cooler 17 → compressor 11. The temperature is lowered to below the set temperature, and when the temperature of the drying chamber 1 becomes below the set temperature, the thermostat 25 switches the solenoid valves 22.23 again, and from then on, the heating condenser 12.13 operates to supply high-temperature, low-humidity air. Drying is performed while repeatedly supplying low-temperature, low-humidity air by stopping the two heating condensers 12 and 13.

In addition, when the aforementioned heating condenser 12.13 is operated, high temperature and low humidity air is supplied, so the air expands as the temperature of the drying chamber 1 rises, and this expanded air causes the inside of the drying chamber 1 to Although the pressure tends to be higher than atmospheric pressure, this expanded air is exhausted to the atmosphere via the check valve 26, so the inside of the drying chamber 1 is maintained at atmospheric pressure. This means that if the check valve 26 is not provided, the pressure will be higher than atmospheric pressure, so the pressure is reduced compared to this case. Then, when low-temperature, low-humidity air is supplied by switching the thermostat 25, the air contracts as the temperature of the drying chamber 1 decreases, and as a result, the inside of the drying chamber 1 is closed to the above-mentioned back check. The pressure is reduced from the atmospheric pressure state obtained by the valve 26, so that the drying chamber 1 is always maintained below atmospheric pressure, and the drying action is promoted accordingly.

Although one embodiment of the present invention has been described above with reference to the drawings, the specific configuration of the present invention is not limited to the above embodiment. For example, the drying device shown in the embodiment has a double heating condenser. There are two coolers installed between them, but one cooler
Only the stand may be provided, and the specific arrangement of the heating condenser and cooler is not limited to the embodiments. It may be placed in

Further, one one-way valve or two or more one-way valves may be provided, and the location thereof is not limited to the drying room, but may be provided at an appropriate location within the air circulation system path. .

As explained above, according to the present invention, heating condensers are disposed before and after the cooler, so that the air passing through the cooler becomes pre-heated high-temperature and humid air, which has a large temperature difference from the cooling temperature. A sufficient dehumidification effect can be obtained due to the difference, and since this air is reheated and supplied to the drying chamber as high-temperature, low-humidity air, an even greater drying effect can be obtained. Furthermore, the inside of the drying chamber can be kept at or below atmospheric pressure by a simple means, and the drying can be carried out under reduced pressure compared to conventional methods, making it possible to perform extremely effective drying.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a drying device used in carrying out the drying method of this embodiment, and FIG. 2 is a circuit diagram of a refrigeration cycle used in the drying device. A: Drying device 1: Drying room 2: Equipment room 12.13: Heating condenser 14: Control condenser 17 + 17: Cooler 25: Thermostat 26 Two check valves (one-way valve) Figure 1 Δ 2 days 27 Figure 2

Claims (1)

[Claims] 1) Forming an air circulation system path for circulating air between the drying room and the equipment room, and arranging a heating condenser, a cooler, and a heating condenser in order from the inlet side in the equipment room, and ,
A control condenser is installed outside the air circulation system, and if the temperature is below the set temperature by the thermostat installed inside the drying chamber, the heating condenser and cooler are operated in the equipment room to supply high-temperature, low-humidity air into the drying chamber. and when the temperature is higher than the set temperature by the thermostat, only the cooler is operated in the equipment room to supply low-temperature, low-humidity air into the drying chamber, and when the heating condenser is activated, the temperature rise due to the supply of high-temperature, low-humidity air is prevented. A drying method characterized in that the expanded air generated is exhausted to the atmosphere through a one-way valve.