JPS60196557A - Dehumidifier - 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 [Technical Field of the Invention] The present invention relates to a dehumidifying device that utilizes a refrigeration cycle and is used primarily for drying wood and the like.

[Prior art] A conventional dehumidifier was constructed as shown in FIG.

In the figure, (I) is a compressor, (21 is a condenser).

(3) A capillary tube that constitutes the squeezing device.

(4) is a cooler, and these are sequentially connected through refrigerant piping (5) to constitute a refrigeration cycle. (6) is an electric motor for driving the compressor (1), (7) is an AC power supply, and (8) is a circuit that supplies electric power to the electric motor (61).

When a dehumidifying device constructed in this manner is used for drying articles, there is a drawback that it takes time for the inside of the drying chamber to reach the desired humidity. For example, when drying wood, initially the relative humidity in the drying chamber is close to 100%, but ultimately it is required that the moisture content of the wood used for furniture etc. be about 10%.

To achieve this, it is necessary to keep the humidity inside the drying room extremely low. In order to achieve a low ultimate humidity, it is best to select a capillary tube that is thin and has a high abrasion resistance, but this will lower the evaporation temperature of the cooler (4) but will also reduce the amount of refrigerant circulation. The dehumidifying ability decreases when humidity is high, and it takes time to reach the desired humidity.
[Summary of the Invention] This invention was made in order to eliminate the above-mentioned drawbacks of the conventional system. When either of them becomes less than a predetermined value, the resistance of the expansion device and the rotational speed of the compressor driving motor are increased to the predetermined values, respectively, without reducing the dehumidifying ability at high humidity.
The purpose of the present invention is to provide a dehumidifying device capable of dehumidifying to considerably low humidity.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. Second
The figure is a schematic configuration diagram showing one embodiment of the present invention. In figure 1, (1) is a compressor, (21 condensers).

(4) is a cooler, (5) is a refrigerant pipe, (61 is an electric motor for driving a compressor, (7) is an AC power supply, and (8) is a power supply circuit.

These are the same as conventional ones. +91 is the first capillary tube connected in parallel with the bypass circuit +IQ, a solenoid valve provided in the αDi-i bypass circuit +IG, a
z is a second capillary tube, which is connected in series with the first capillary tube (9), and these constitute a variable resistance diaphragm fff, a:s. a4 is a humidity sensor that detects the humidity of the air flowing into the cooler (4), (is is a temperature sensor that detects the temperature of the air flowing into the cooler (4), QG is a power supply to the electric motor (61) The circuit (8) is a variable frequency power supply circuit composed of a rectifier circuit and a variable frequency inverter circuit.

By increasing or decreasing the power frequency, it acts as a rotation speed control device for the electric motor (6). an is tg degree seven cents 041. Input the detection signal of the temperature sensor is, and set the detected humidity and temperature to predetermined values, for example, humidity 50% and temperature 20%.
℃ or below, close the solenoid valve +III and set the frequency of the variable frequency power supply circuit 111i50Q to a predetermined value, for example 70Hz.
This is a controller that increases the Note that at least the condenser (
21, cooler (4), humidity sensor a4I, and temperature sensor (19) are housed in the drying chamber.

Next, the operation of the embodiment shown in FIG. 2 will be explained. For example, when drying wood, initially the moisture evaporated from the wood causes the humidity of the air A flowing into the drying room, that is, the cooler (4), to be at a high humidity of nearly 100%, but the temperature is still low compared to the outside air temperature. 1-〈In winter, the temperature is 20℃ or less. Therefore, in this case, the controller aυ is
Because it is below 0℃.

Close the solenoid valve (111) and set the output frequency of 1 circuit 6G to 50H.
Switch from 2 to 70 Hz. Therefore, the refrigerant flows through the first capillary reach tube (9) and the second gear tube (9).
z in series and flows through the refrigeration cycle, and the rotation speed of the compressor drive motor (61) increases by 40%.If the temperature of the air flowing into the cooler +41 is low, the throttling resistance of the throttling device 03 is increased. This lowers the evaporation temperature, lowers the surface temperature of the cooler (4), promotes dew condensation on its surface, and dehumidifies the air without stopping.On the other hand, the rotational speed of the compressor fil increases, so the refrigerant consumption increases. This increases the dehumidification capacity by compensating for the decrease in refrigerant circulation due to the increase in throttle resistance and increasing the dehumidifying capacity.In addition, since the evaporation temperature is low, even if the compressor U+ speeds up, it will not become overloaded.This operation Next, compressor +1
The room temperature in the drying room rises to exceed 20℃ due to the heating effect of the dehumidifier due to the heat generated by the input of
The humidity is close to 00%. Therefore, the controller aη is.

Each sensor 041 a! In response to the output signal from 9, the solenoid valve 0υ is opened and the output frequency of the variable frequency power supply circuit t1G is lowered to the original 50Hz. Therefore, the throttle device f13 is bypassed by the bypass circuit θq, so that the resistance decreases and the rotational speed of the compressor (1) also decreases. When the throttle resistance decreases, the evaporation temperature of the cooler increases, but since the room temperature is rising and the humidity is high, the dew point temperature is high and there is no problem with dehumidification, and the dehumidification capacity decreases due to the increase in refrigerant circulation due to the decrease in resistance Rise.

Since the rotation speed of the compressor (1) decreases, the compressor (1) will not be overloaded due to an increase in the amount of refrigerant circulation.

As a result of this operation, when the wood is dried and the relative humidity of the indoor air drops to 50 degrees, the humidity sensor 04
is detected, the solenoid valve aυ is opened again by the controller aD, and the output frequency of the power supply circuit +Ifl increases.

This increases the throttling resistance of the throttling device (131), lowers the evaporation temperature of the cooler (4), and lowers its surface temperature, so that dehumidification continues without interruption even if the dew point drops due to a drop in humidity. Throttling device 0 9 due to the increase in drawing resistance of
Normally, the amount of refrigerant circulation would decrease, but this can be compensated for by increasing the rotational speed of the compressor (1) due to an increase in the power supply circuit frequency, and the dehumidifying ability can be maintained high at low humidity.

〔Effect of the invention〕

As described above, according to the present invention, a sensor is provided that detects the humidity and temperature of the air flowing into the cooler, and when either the humidity or temperature detected by these sensors falls below a predetermined value, the resistance of the diaphragm device increases. By increasing the number of rotations of the compressor as well as increasing the number of rotations of the compressor, the dehumidification capacity is high both in low humidity and high mixing conditions, making it possible to achieve a low ultimate humidity and prevent overloading of the compressor. It has the effect of allowing you to fully demonstrate your abilities at all times.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a conventional dehumidifying device, and FIG. 2 is a schematic diagram of an embodiment of the present invention. In the figure, (1) is a compressor, (2I is a condenser, (4)
is the cooler, (5) is the refrigerant pipe, (61 is the electric #I machine, (9 is
) is the 10th capillary reach tube, (IG is its bypass circuit. 0υ is the solenoid valve, α2 is the second capillary tube. 03 is these +91 fil (ID is a temperature sensor,
aG is a variable frequency power supply circuit that acts as a motor rotation speed control device. (171 is a controller. In addition, the same reference numerals in the figures indicate the same or corresponding parts. Agent: Masuo Oiwa (and 2 others) Figure 1 Figure 2 Figure 12 +3':j

Claims (1)

[Claims] +I+ A refrigeration cycle is constructed by sequentially communicating a compressor, a condenser, a throttle device, and a cooler through refrigerant piping. In a dehumidifying device that dehumidifies air that has been cooled and dehumidified in the cooler by raising its temperature in the condenser, a humidity sensor that detects the humidity of the air flowing into the cooler;
A temperature sensor that detects the temperature of the air flowing into the cooler, a rotation speed control device that controls the rotation speed of the electric motor that drives the compressor, and a rotation speed control device that controls the humidity detected by the humidity sensor and the temperature detected by the temperature sensor. If any of them becomes less than a predetermined value. A dehumidifying device comprising a controller that increases the resistance of the throttle device to a predetermined value and controls the rotation speed control device so that the motor rotation speed increases to a predetermined value. (2) The rotation speed control device is a variable frequency power supply circuit that supplies a variable frequency voltage to the compressor driving electric motor, and the output frequency of this circuit is controlled by the controller. A dehumidifying device according to scope 1. (3) The throttle device includes a first capillary tube having a parallel bypass circuit opened and closed by a solenoid valve and a second capillary tube connected in series with the first capillary tube, and the solenoid valve is controlled by the controller. A dehumidifying device according to claim 1 or 2, wherein the dehumidifying device is controlled to open and close. (4) The dehumidifying device according to claim 1, 2, or 3, wherein the cooler, condenser, humidity sensor, and temperature sensor are housed in a drying chamber, and is used as an article changing machine. (5) The dehumidifying device according to claim 4, wherein the article is wood.