JPH03154614A - Dehumidifying device - Google Patents

Abstract

PURPOSE:To prevent fillers from being carried off with the water being discharged by a method wherein a spacing part provided in a moisture absorbing body having the tiny opening in its inorg. porous structure filled with moisture absorbing fillers is evacuated to reduce the pressure thereof and, when a predetermined amt. of water is collected in a liq. collecting part for discharging, the water is heated so as to be evaporated. CONSTITUTION:A moisture-absorbing body 1 is formed by filling moisture-absorbing fillers such as calcium chloride and lithium chloride into the openings of an inorg. porous structure having tiny openings with an average size of at least 10mu in diameter such as gypsum, cement and calcium silicate. A spacing part 4 is provided on one side or in the interior of the moisture-absorbing body 1 (the figure shows the spacing in the case of one side) and evacuated by a vacuum pump 5 to reduce the pressure thereof. When a predetermined amt. of the water is collected for discharging in a liq. collecting part 7 below the spacing 4, it is sensed by a detector 2 and a detection control circuit part 6 is then activated to energize a heating element 3 so as to heat the water for evaporation. When the aforesaid water is decreased to or below a predetermined amt., the heating element is deenergized to stop the heating and the pressure reduction, whereby the conc. water is recovered by the porous structure 1. This prevents the fillers from being carried off with the water and permits the moisture- absorbing body 1 to be used a long period of time.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vacuum dehumidification device using suction means.

(Prior art and its problems) As disclosed in Japanese Patent Application Nos. 61-220375,
There is a device in which a moisture absorbing panel is formed by containing a hygroscopic filler in a porous body having continuous micro voids, and a dehumidifying space is provided on the back side of the moisture absorbing panel. The moisture release speed of the transparent material is several to several ten times faster than the moisture absorption speed. Therefore, there is a drawback that the water dehumidified in the space accumulates in the reduced pressure space, and when the hygroscopic filler is washed away, the dehumidification ability decreases.

On the other hand, subsequent research has shown that when this porous material is used, even if the liquid is once liquefied, if the liquid and the porous material are left in contact, the solution of the hygroscopic filler is reabsorbed by the porous material, and the hygroscopic filler is not unevenly distributed. It was found that the original hygroscopic distribution state returned.

The present invention utilizes this characteristic to provide a dehumidifying device that can release only the moisture collected by the moisture absorption body to the outside of the system, can prevent the hygroscopic filler from being washed away, and does not cause deterioration in moisture absorption performance over a long period of time. The purpose is to

(Means for Solving the Problems) In order to achieve the above object, the dehumidifying device of the present invention includes: (1) retaining a hygroscopic filler internally in an inorganic porous body having fine voids with an average pore diameter of 10 microns or less; Hygroscopic body (1
) is provided with a space (4) on one side or inside the space (4).
) is provided with a suction means (5) for depressurizing and suctioning the liquid, and ■ a liquid collection part (
7) is provided, ■ a detection means (2) for detecting the amount of discharged water accumulated in the liquid collecting section (7) is provided in the liquid collecting section (7), and ■ the amount of discharged water accumulated in the liquid collecting section (7) is When the value exceeds the set value, the detection means (2) is activated, and the liquid collection section (7)
A heating element (3) for heating the discharged water is provided in the liquid collection section (7).

This technical method is adopted.

(for production) The effects of the features of the present invention are as follows.

(2) The hygroscopic body (1), which is made of an inorganic porous body having microscopic voids with an average pore diameter of 10 microns or less and retaining a hygroscopic filler therein, absorbs humidity from the indoor air.

(2) When the moisture absorber (1) is depressurized from the − blade side (decompression space side), the humidity moves to the decompression side through the microscopic voids of the moisture absorber (1) and is released.

■ At that time, moisture is released to the outside of the system via the decompression space (4), but the decompression space (4) side of the moisture absorber (1) and the inside of the decompression space (4) become highly humid, causing liquefaction. It collects in the liquid collection part (7).

(2) Therefore, by heating the heating element (1) provided in the liquid collecting section (7), thermal energy is applied to the liquid to evaporate it and discharge it outside the system.

(2) After the operation is completed, the highly concentrated hygroscopic filler-containing aqueous solution remaining in the liquid collecting section (7) is reabsorbed into the inorganic porous body and dispersed within the porous body (1).

(2) That is, the amount of water released into the depressurized space (4) minus the amount of water reabsorbed by the porous body is dehumidified to the outside of the system.

(Example) Hereinafter, an example of the present invention will be described based on the accompanying drawings.

FIG. 1(a) is a principle diagram showing a first embodiment of a dehumidifying device according to the present invention, FIG. 1(b) is a flowchart diagram of a detection/control circuit, and FIG. FIG. 3 is a principle diagram showing a third embodiment of the dehumidification device according to the present invention.

First, the first embodiment shown in Fig. 1 is installed on a wall or the like and used vertically, and the moisture absorbent body (1) is in contact with one side (the surface facing the decompressed space (4)) of the moisture absorbent body (1). The heating element (3) is attached to the liquid collection part (7).

This reduced pressure space (4) is connected to a vacuum pump (hereinafter, a vacuum pump will be explained as a typical example of suction means) which is a suction means (5), and the reduced pressure space (4) is The moisture released inside is now released outside the system (outdoors). In addition, a float switch as the detection means (2) (hereinafter, a float switch will be explained as a representative example of the detection means, but it is limited to a float switch as long as it can detect the amount of water accumulated in the liquid collection part (7)). Needless to say, there is no such thing.) and the heating element (
3) and the vacuum pump (5) can both be automatically controlled by a detection/control circuit (6). One of the moisture absorbers (1) is positioned lower than the horizontal direction, and a liquid collection part (7) is formed in a depressurized space (4) separated from the casing A. Inside it is a heating element (3),
A float switch (2) is installed. The depressurized space (4) can be depressurized by an externally provided vacuum pump (5). The disconnection of these float switches (2), heating elements (3), and decompression spaces (4) is automatically controlled by a detection/control circuit (6).

In FIG. 2, the dehumidifier is installed on the ceiling or the like and used horizontally, and the discharge surface is inclined so that the water discharged from the decompression space (4) is collected on one side.

Furthermore, in the third embodiment shown in FIG. 3, a reduced pressure space (4) is formed within the cube-shaped moisture absorber (1),
4) A heat generating element (3) is disposed inside, and a float switch (2) is disposed at the same time. Then, the pressure in the decompression space (4) can be reduced by a vacuum pump (5) provided outside. These heating element (3), float switch (2), and vacuum pump (5) can all be automatically controlled by a detection/control circuit (6).

In the first to third embodiments described above, a float switch (
2) is provided, but after vacuum suction, this float switch (2) detects this at a certain water level where liquefaction has occurred on the pressure reducing side surface of the moisture absorbing body (1), and the heating element (
3) is turned on, supplements the evaporation energy, releases moisture outside the system, and is automatically controlled by the detection and control circuit (6) to turn off when moisture detection is no longer performed due to a drop in the water level. There is. As a result, the water concentrated in the hygroscopic filler accumulates at the bottom of the liquid collection part (7), is reabsorbed by the inorganic porous body, and is subsequently uniformly distributed to restore the hygroscopic performance.

Here, examples of materials used as the moisture absorbent (1) include inorganic porous materials such as gypsum, cement, calcium silicate plates, and ceramic sintered bodies, especially those with an average pore diameter of 10 microns or less. is desirable.

In addition, the hygroscopic filler used includes, for example, (1) a deliquescent substance such as calcium chloride, lithium chloride, etc. as an essential component, and (2) ethylene glycol, triethylene glycol, glycerin, sodium polyacrylate, PVA as appropriate. Water-soluble polymers such as bentonite,
Seviolite, wollastonite, zeolite, activated carbon,
Examples include inorganic hygroscopic materials such as molecular sieves, water-insoluble polymeric hygroscopic materials such as grafted starch and isobutylene maleic anhydride, or mixtures thereof.

Furthermore, as a method for internally adding and retaining a hygroscopic filler into the micropores of the inorganic porous material, for example, the hygroscopic filler is kneaded together with the raw material of the porous body and cured.

In particular, it is more desirable to mix an inorganic hygroscopic material such as bentonate with water, such as calcium chloride or diethylene glycol, and knead and mold the mixture with cement or gypsum, since the hygroscopic filler is less likely to ooze out into the surface of the hygroscopic surface.

In addition, the heating element (2) used in the present invention includes:
For example, there are cable heaters, sheathed heaters, fin heaters, etc. In the case of Fig. 2, such a heating element (3) is installed on one side (decompression space (4) side) of the moisture absorbing body (1). For example, as in the second embodiment, they may be provided independently via a space, or they may be attached and integrated. The heating element (2) may be treated with moisture-proofing, rust-proofing, or leakage prevention treatment as appropriate, or a heat-uniforming sheet such as a wire mesh may be laminated integrally with the casing A of the liquid collecting portion (7) in order to uniformize heating. good.

As shown in the first embodiment, the vacuum pump (5), for example, is used as the vacuum suction means to reduce the absolute pressure in the vacuum space (4) to an absolute pressure of 20 to 200 degrees + mHg.

Note that the reduced pressure suction means may be operated continuously or may be operated intermittently. In this case, it is desirable to install a humidity sensor in the room that absorbs moisture so that it can be automatically controlled.

Furthermore, the surface of the inorganic porous material constituting the moisture absorbing body (1) can be improved by providing paper, cloth, a porous resin membrane, a semipermeable membrane, a moisture permeable water repellent membrane, etc. on the surface (moisture absorption side) of the inorganic porous body constituting the moisture absorbing body (1). It is desirable to prevent oozing of the hygroscopic filler from the surface of the paint and improve cosmetic properties, durability, and stain resistance.

The suction and heating element (2) can be controlled using a compact and reliable float switch, but a timer, temperature sensor, humidity sensor, etc., vacuum suction means, and heating element (3) are also required.
It may also be possible to control by connecting them.

The heating element (3) can be separated from the moisture absorbing body (1) to heat the decompressed space (4) as in the first embodiment (see FIG. 1(a)), or the third embodiment (see FIG. 1(a)). (See Figure 3), it may be placed in the depressurized space (4) inside the moisture absorber (1), but if the moisture absorber (1) is heated too much, moisture will radiate from the surface side. Therefore, it is desirable to control it appropriately or keep it away from the moisture absorber (1).

(Experimental Example) Experimental Example 1 Gypsum, water, and calcium chloride were cross-cured in a ratio of 100 x 100 x 35, and dried to produce a 20 mm thick gypsum reactant, which was used as a moisture absorbent. The back surface of this moisture absorbent body was covered with a resin casing, and a space for a liquid collection part having a depth of 20 mm and a width of 1.00 mm was provided at the bottom, which was equipped with a float switch and a heating element. Size 1.000mmX1
．． A device consisting of a main body (Fig. 1(a)) of 000+am x 50m+a, a vacuum pump, and a detection/control circuit was fabricated. A heating element was provided 10 mm from the bottom of the reduced pressure space so that the liquid collection section could be heated using a 200 W vibrator heater, and the float switch was placed 10 mm above the heating element of the liquid collection section.

In order to prevent the moisture absorbent from bending during depressurization, resin ribs with a width of 10 mm were provided at 7-meter intervals on the moisture absorbent body for reinforcement.

The dehumidification device having the above configuration was operated under an environmental condition of 8°C and 90RH (7) 2. OOOa+@X1. 500m
mX1. 80 ts (Used in a closed room, the absolute pressure reached in the back space of the moisture absorber is 5hmflg, the exhaust speed is 15
The pressure was reduced using a Uwin vacuum pump. Note that the exhaust from the vacuum pump was outside the room.

After the start of operation, the pressure is reduced to an absolute pressure of 50 mmHg in 2 minutes,
The generation of discharged water was observed on the surface of the moisture absorber in the back space, and this discharged water collected in the liquid collection section, and the float of the float switch was raised to turn on the switch and energize the heating element. Under reduced pressure of 50mmllg, the boiling point of water dropped to about 50℃, and the water discharged from the moisture absorber was pooled due to insufficient evaporation energy, but when 50cc or more accumulated, the float switch was turned on, and after that the volume increased to 700cc. Evaporation of discharged moisture was promoted, and the accumulated moisture decreased 20 minutes after electricity was applied. As the accumulated moisture decreased, the float switch was turned off and the electricity to the heating element was stopped. Since moisture is continuously drained from the moisture absorbing body, there is a stagnant flow of dehumidified moisture again, but when it accumulates in the liquid collection part, the float switch detects it, so as mentioned above, it is not caused by the energization of the heating element. As the temperature of the retained water increased, it was turned into steam again and discharged from the system.

In this way, the dehumidification function was effectively and repeatedly restored, and in one hour the relative humidity in the room was reduced to 60% Rll while remaining at the same temperature.

Experimental Example 2 Cross-cure gypsum, water, and calcium chloride in a ratio of 100, 100, and 35, and dry to form a 5001 square with a thickness of 30 mm +
A plate-like body was manufactured and used as a moisture absorbent. A vacuum space is provided on one side of the moisture absorbent body in the same way as in the first embodiment, and a heating element consisting of a 200W vibrator heater and a float switch are placed on the surface side of the moisture absorption body and are placed in the liquid collection section of the vacuum space. We have manufactured a dehumidifier equipped with Then, in an environment with an outside temperature of 30°C (temperature in the vacuum side space of the moisture absorber: 27 to 28°C), the first vacuum space was pumped to 6 mL using a vacuum pump.
When the pressure was reduced to 1.5 g, the temperature in the reduced pressure space of the moisture absorber dropped to 22 to 24° C. 2 minutes after the start of operation, and dew condensation water began to accumulate in the liquid collection section. This condensed water was detected by a float switch, and the heating element was energized. Due to the heating of this heating element, the temperature of the condensed water reaches 50℃ within 10 minutes after electricity is turned on.
evaporation took place actively. It was also possible to remove 5g of moisture per minute.

Example 3 Next, a test was conducted to demonstrate that the hygroscopic filler is reabsorbed into the inorganic porous body during outage and is almost uniformly dispersed.

In a vertical device after repeated depressurization (thickness: 15 mm, height: 1.00 mm, width: 500 mm)
After repeated dehumidification, approximately 100 cc of condensed water was left in the liquid collection part, the vacuum pump was stopped, and the vacuum pump was left indoors overnight.The aqueous solution containing calcium chloride was reabsorbed by the moisture absorber. No condensed water remained in the liquid collection section.

Therefore, when the water content distribution of the moisture absorbent body was measured, no significant difference was observed in the water content difference in the vertical (vertical) direction. In addition, when a chloride ion concentration analysis was performed on a specimen taken at an adjacent position, the following results were obtained, indicating that the hygroscopic filler was uniformly dispersed. (FIG. 4) In FIG. 4, the water content and chloride ion concentration were measured at the top (■), the center (■), and the bottom (■) of the moisture absorbent body. The results are shown in the table below. (Margins below) Table 1 For comparison, a moisture absorbent board manufactured at the same time with the same composition was placed horizontally. I also analyzed the chloride ion concentration of the samples that had been left in the room for 1 hour, and the results were 8.68% and 8.60%, respectively.
■No significant difference was observed. From the above, even after dehumidification under reduced pressure, the calcium chloride distribution in the moisture absorbent body is uniform, and there is no deterioration in the dehumidification effect.

(Effects) The dehumidifying device of the present invention dehumidifies and suctions a part of a hygroscopic body formed by internally retaining a hygroscopic filler in an inorganic porous body having fine voids with an average pore size of 10 microns or less, and also dehumidifies and suctions a part of the hygroscopic body into the decompressed space. A liquid collecting section that contacts the porous body is provided on the side, and a detection means for detecting the amount of discharged water accumulated in the liquid collecting section is provided in the liquid collecting section, and when the amount of discharged water accumulated in the liquid collecting section exceeds a set value, the Since a heating element is provided that activates the detection means to heat the discharged water of the liquid collection section, the detection means determines that the amount of discharged water has exceeded a certain level and stops energizing the heating element to effectively Only moisture is released, and when the amount of discharged water becomes below a certain level, the detection means stops energizing the heating element. In addition, if the decompression is stopped and left as it is, the concentrated waste water of the hygroscopic filler can be reabsorbed into the porous body, and therefore the hygroscopic filler can be prevented from flowing out of the system, and the hygroscopic filler can be left undisturbed. It is possible to maintain performance over a long period of time.

[Brief explanation of the drawing]

Fig. 1(a)...A schematic sectional view of the first embodiment of the dehumidification device according to the present invention Fig. 1(b)...Block circuit diagram of the electric circuit used in the present invention Fig. 2...・Schematic cross-sectional view of the second embodiment of the dehumidifying device according to the present invention. FIG. 3. Schematic perspective view of the third embodiment of the dehumidifying device according to the present invention. FIG. 4. Cross-sectional view A showing experimental conditions for measuring reabsorption distribution state...Casing (1)...Moisture absorbing body (2)...Detecting means (float switch) (3)...Heating element (4) )...Decompression space (5)...Suction means (vacuum pump) (6)...Detection/control circuit (7)...Liquid collection section No. 4 Hi No. 1 Nagi (8) No. Yama (b )

Claims (1)

[Claims] (1) A space is provided on one side or inside of a hygroscopic body made of an inorganic porous body having fine voids with an average pore size of 10 microns or less and a hygroscopic filler internally added thereto, and suction is performed to reduce pressure and suck the space. In addition to providing means, a liquid collecting section in contact with the porous body is provided on the side of the depressurized space, and a detecting means for detecting the amount of discharged water accumulated in the liquid collecting section is provided in the liquid collecting section, and the amount of discharged water accumulated in the liquid collecting section is set. A dehumidifying device characterized in that the detection means is activated when the temperature exceeds a certain value, and a heating element is provided in the liquid collecting section to heat the discharged water from the liquid collecting section.