JPS632831Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to an improvement of a dehumidification device using a refrigeration cycle.

[Prior art]

Usually, this type of equipment is designed for annual use, depending on the dehumidifier's intake air temperature and relative humidity (e.g. 25℃, 50℃).
The capacities of the cooler and condenser are selected based on the dehumidification capacity (%), and the optimum air volume (for example, G ₁ ) to the cooler is selected from the relationship between the air volume and dehumidification capacity shown in FIG. On the other hand, during actual use, the equipment must be able to operate normally from low to high room temperatures, but especially at high room temperatures, the optimum air volume G ₁ must be determined from the relationship with the air volume shown in Figure 2.
In this case, the condensation pressure reached CP ₁ , which was higher than the set pressure CP of the pressure switch for high pressure rise protection, and the dehumidification equipment stopped abnormally. Therefore, in order to operate the dehumidifier normally even at high room temperatures, the air volume G ₂ (this The condensing pressure at the time must be selected as CP ₂ ). In addition, when selecting in this way, the air volume is too large at normal temperatures, so the low-pressure force increases, and sensible heat changes account for most of the change, while latent heat changes decrease, so the dehumidification capacity decreases to Q as shown in Figure 1. ₂
This will result in a decrease to

Also, when the relative humidity decreases (e.g. 25℃, 30℃)
%) As shown in Figure 1, the air volume that provides the highest dehumidification capacity is G ₃ , and the dehumidification capacity at the air volume G ₂ is significantly reduced to Q ₄ .

Conventionally, as a measure to reduce the condensing pressure, there is a method of increasing the air volume by changing the rotation speed of the blower to suppress the increase in the condensing pressure. In this case, the amount of air passing through the condenser increases and the condensing pressure decreases, but on the other hand,
The amount of air passing through the cooler also increases, so
As shown in the figure, the dehumidification capacity decreases, and as the evaporation temperature of the refrigerant gas increases in the cooler, the evaporation pressure increases, which slows down the drop in condensation pressure, so the effect is not significant. It cannot be expected, and as shown in Figure 1, when the relative humidity decreases, it decreases drastically.

[Summary of the idea]

This device includes a first ventilation duct that guides the air in the room to be dehumidified to the cooler and a second ventilation duct that leads the air in the room to be dehumidified to the condenser bypassing the cooler. The ventilation duct is provided with first and second dampers that open and close independently, respectively, in an attempt to eliminate the above-mentioned drawbacks.

[Example of idea]

FIG. 3 is a block diagram of a dehumidifying device showing an embodiment of this invention. In the figure, 1 indicates an inlet 2,
2' and a main body having an air outlet 3; 4, a drain pan that divides the inside of the main body 1 below the suction port 2 into a machine room 5 and a heat exchange room 6; 7, a compressor installed in the machine room 5; 8; , 9 are coolers and condensers that are sequentially arranged in the heat exchange chamber 6 from the suction port 2 to the blowout port 3, and are connected to the compressor 1 and a throttle device (not shown) to form a well-known refrigeration cycle. are doing. 1
0 is a blower installed near the outlet 3 to ventilate the cooler 8 and condenser 9; 11 is a first ventilation duct that ventilates air from a dehumidifying room (not shown) to the cooler 8; A second ventilation duct that bypasses the cooler 8 and ventilates the air in the dehumidification room (not shown) to the condenser 9; 13 is the first ventilation duct 11;
A first damper 14 is provided within the second ventilation duct 12 and adjusts the ventilation area;
The first damper 13 and the second damper 14, which are second dampers that adjust the ventilation area, are each independently driven by a speed reducer (not shown). Reference numeral 15 denotes a humidity detector for controlling the operation of a speed reducer (not shown) that drives the first damper 13, and its humidity sensing section 17 is provided near the entrance of the first ventilation duct 11 to detect the humidity of the intake air. It is activated when the humidity is lower than a predetermined value (for example, 50%), and the ventilation area is gradually reduced depending on the humidity. Reference numeral 16 denotes a temperature detector for controlling the operation of a speed reducer (not shown) that drives the second damper 14, and its moisture sensing section 18 is provided near the entrance of the second ventilation duct 12 to detect the temperature of the intake air. It operates when the temperature is higher than a predetermined value (for example, 30°C) and increases the ventilation area.

In such a configuration, the refrigeration cycle and the blower 10 are operated, the air taken in from the suction port 2 is cooled and dehumidified by the cooler 8, and the heat is collected by the condenser 9 and sent from the air outlet 3 to the room to be dehumidified outside the machine ( During operation when the intake air temperature is lower than a predetermined value, the first damper 14 is positioned as shown by the solid line in FIG. 3, closing the second ventilation duct 12. Therefore, the air volume passing through the cooler 8 and the condenser 9 becomes equal, and at this time, as shown in FIG.
Since the air volume of the blower 10 is selected so that the air volume is _G1 , it can be operated at the maximum dehumidifying capacity _Q1 .

When the intake air temperature becomes higher than a predetermined value, the condensing pressure increases with the temperature as shown in FIG. 5, but at the same time, the temperature detector 16 detects the temperature and the second damper 14 opens. Air flows through the second ventilation duct 12 , and bypass air that does not pass through the cooler 8 flows into the condenser 9 . At this time, the ventilation resistance of the intake air becomes smaller than when the second damper 14 is closed during normal operation, and the blower 1
0 static pressure decreases from P ₁ to P ₂ , the characteristic of the blower 10 is that the air volume increases from G 1 to G 2 based on the relationship between static pressure and air volume shown in Fig. 4, and the increased air volume increases from G ₁ to G ₂ .
Since G ₂ −G ₁ is the increase in the amount of ventilation to the condenser 9, the condensing pressure decreases to CP as shown in FIG.

Further, even if the air volume of the blower 10 increases, the air volume passing through the cooler 8 does not increase because it is partially bypassed, and can be maintained almost the same as the optimum air volume _G1 shown in FIG. Therefore, as shown in FIG. 1, the dehumidifying capacity can be maintained at approximately the maximum dehumidifying capacity _Q1 , the evaporation pressure does not increase, and the aforementioned decrease in condensing pressure directly appears as an effect. Further, when the relative humidity becomes lower than a predetermined value, the humidity detector 15 detects the humidity and operates the first damper 13 toward the dotted line position where the ventilation area is reduced from the open position shown by the solid line. At this time, the ventilation resistance increases and the blower 1
Since the static pressure at 0 increases from P ₂ to P ₃ , the characteristic of the blower 10 is that from the relationship between static pressure and air volume shown in Figure 4, the air volume decreases from G ₂ to G ₃ , so dehumidification occurs as shown in Figure 1. The capacity increases and can maintain almost the maximum dehumidification capacity _Q3 . Note that even if the air volume decreases, as shown in Figure 5, the condensing pressure at low humidity will decrease, so it will not exceed the set pressure CP.

Further, in the above embodiment, the first and second dampers 1
Although the opening/closing control of No. 3 and 14 was performed based on the temperature and humidity of the suction air, it is also possible to detect the blowing air temperature, condensation pressure or temperature, or evaporation pressure or temperature and control the opening/closing accordingly. In other words, directly,
Alternatively, the opening/closing may be controlled manually or automatically by indirectly detecting the ambient temperature, humidity, and pressure.

[Effect of idea]

As described above, this idea suppresses the increase in condensing pressure when the ambient temperature rises, prevents the equipment from stopping abnormally, and allows operation at the optimal air volume even when humidity drops, resulting in stable dehumidification. You can demonstrate your abilities.

[Brief explanation of the drawing]

Figure 1 is a graph showing the relationship between dehumidification capacity and air volume.
Fig. 2 is a graph showing the relationship between condensation pressure and air volume, Fig. 3 is a block diagram of a dehumidifier showing an embodiment of this invention, Fig. 4 is a graph showing the relationship between ventilation resistance and air volume, and Fig. 5 is a graph showing the relationship between condensation pressure and suction air temperature. In the figure, 8 is a cooler, 9 is a condenser, 11 is a first ventilation duct, 12 is a second ventilation duct, 13 is a first damper, and 14 is a second damper.

Claims (1)

[Scope of utility model registration request] The air in the dehumidified room is ventilated in the order of the cooler and the condenser, and the suction air that has been cooled and dehumidified by the cooler is collected heat by the condenser and blown out to dehumidify the room to be dehumidified. a first ventilation duct that guides the air to the cooler, and a second ventilation duct that leads the air in the room to be dehumidified to the condenser bypassing the cooler, the first and second ventilation ducts The dehumidifier includes first and second dampers that open and close independently.