JPH0594634U - Air humidifier - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a humidifier that can perform precise humidification control regardless of air temperature and air volume. [Structure] A porous plate having a three-dimensional network structure made of sintered SiC is arranged in an air passage so that its wide surface side is substantially vertical, and a layer of inorganic fibers is in contact with the upper surface of the porous plate. In addition, a water supply pipe is arranged so that the entire inorganic fiber layer is impregnated with water, and a water receiver is provided below the porous plate so that the lower part of the plate is below the water surface. Provided,
It is an air humidifier in which electrodes for energizing the plate are attached to both sides of the porous plate.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an air humidifier capable of controlling the amount of humidification by controlling the amount of electricity even when the air flow rate is constant.

[0002]

[Prior Art]

 As a method of humidifying the air to be treated, there is also a method of spraying fine water droplets into the air to be treated using ultrasonic waves or a special nozzle, but there is a problem in mist collection and controllability. Most commonly, a hydrophilic or water-retaining resin or non-woven fabric is used as a humidifying medium, and the capillary phenomenon of this humidifying medium is used to moisten the medium with water, or water is sprayed onto the medium to wet it. The air-liquid contact type humidification method that allows the air to be processed to pass through this wet medium is commonly used in addition to the external air conditioner.

According to the vapor-liquid contact type vaporization humidification method, the evaporation amount of water is substantially determined by the wind velocity, temperature and humidity of the air passing through the wet medium. Therefore, if the wet state of the media is kept almost constant, the humidification amount is self-adjusted by the wind speed, temperature and humidity of the passing air.

[0004]

[Problems to be solved by the device]

 The vaporization-type humidification method in which gas and liquid are brought into contact with a wet medium has an advantage in that the humidification amount is self-adjusted as described above, but the load side requests a humidification amount other than the self-adjusted humidification amount, In addition, there is a problem that it is not possible to deal with this when it is necessary to humidify at an arbitrary acceleration. In other words, with this method, the only way to control the amount of humidification is to adjust the air flow rate. However, if the flow rate of air is adjusted, not only humidity but also airflow velocity and temperature will change, and this will affect others. For this reason, there was no other measure than steam heating in a system that required precise humidification control.

Further, in the conventional vaporization type heating system, there is a problem that the temperature of the conditioned air is lowered because humidification is performed due to adiabatic change. Further, in a long-time operation, the antibacterial agent in the humidifying medium of resin or non-woven fabric is also present. However, there was a problem that the antibacterial effect was weakened due to the elution of spores, and it became a breeding ground for microorganisms.

From the above, it was considered that the wet medium is composed of an electric heating element and the amount of humidification is controlled by controlling the amount of electric power supplied to the electric medium. There were a number of problems that had to be solved, such as water flow means.

The present invention is intended to solve such a problem.

[0008]

[Means for Solving the Problems]

 According to the present invention, a porous plate having a three-dimensional network structure made of sintered SiC is arranged in the air passage so that its wide surface side is almost vertical, and is in contact with the upper surface of the porous plate. A layer of inorganic fibers is provided, and a water supply pipe is arranged so that the entire inorganic fiber layer is impregnated with water, so that the lower part of the plate is below the water surface below the porous plate. Provided is an air humidifier in which a water receiver is provided and electrodes for energizing the plate-like body are attached to both sides of the porous plate-like body.

[0009]

【Example】

 The configuration and operation of the device of the present invention will be specifically described below with reference to the embodiments of the drawings.

1 and 2 show a state in which electrodes 2 and 3 are connected to both sides of a porous plate-like body (hereinafter referred to as porous SiC plate) 1 having a three-dimensional network structure made of sintered SiC. It is a thing. Porous SiC plate 1 is a high temperature sintered body containing 98% or more of SiC, and has a pore diameter of 0.8 to 3.0 mm, a porosity of 80% or more, and a specific resistance of 3 to 18 Ω · cm. use. It was found that those satisfying this condition had uniform breathability, uniform exothermicity, and even water wettability and flowability.

For data acquisition, which will be described later, a thickness of 10 mm, a height of 60 mm, and a width of 150 mm was used, but the distribution of water flowing through the porous SiC plate 1 is made uniform. The thickness of 8 to 12 mm is preferable, and the effect of natural absorption of water from the lower water receiver was possible up to 70 mm.

3 and 4 show the entire structure of the humidifier of the present invention. The porous SiC plate 1 is placed almost vertically so as to vertically traverse the air passage, and a layer 4 of inorganic fibers is provided in contact with the upper surface thereof so that the whole inorganic fiber layer 4 is impregnated with water. The water supply pipe 5 is arranged in the. In addition to the example of arranging the porous SiC plate 1 so as to cross the air passage vertically, it may be arranged in parallel with the air passage, and even if it is not necessarily arranged in the air passage where the forced air flow exists, It can also be placed indoors or in a box in an air atmosphere.

The inorganic fiber layer 4 is a layer of insulating fiber such as rock wool, glass wool or kaolin wool, and the water supplied from the water supply pipe 5 is once impregnated into the entire inorganic fiber layer 4. Insulating inorganic porous materials, ceramics, etc. can be used in place of inorganic fibers as long as they can be impregnated with water.

The water supply pipe 5 has a large number of nozzle openings 6, and by arranging the nozzle openings 6 horizontally on the inorganic fiber layer 4, water is sprinkled over the entire inorganic fiber layer 4. 7 is the main water supply pipe. With this configuration, the water impregnated in the entire inorganic fiber layer 4 flows evenly through the porous SiC plate 1 in contact with this layer 4.

On the other hand, a water receiving pan 8 is provided below the porous SiC plate 1. The lower part of the porous SiC plate 1 is immersed in the water in the pan 8 so that the lower surface of the porous SiC plate 1 is below the overflow line of the water receiving van 8. When the water receiving pan 8 is made of metal, an insulating paint such as flame-retardant silicone rubber 10 is used so as not to make conductive contact with the porous SiC plate 1 and the electrodes 2 and 3. Although not shown, the water overflowing from the water receiving pan 8 is received in a drain pan provided below it.

The electrodes 2 and 3 are provided on both sides of the porous SiC plate 1, and the electrodes 2 and 3 are in conductive contact over the entire height of the SiC plate 1. The one-piece thus constructed is housed in the frame frame 11. The frame 11 has openings for ventilation in the front and back of the wide surface side of the SiC plate 1, and a blind plate is provided behind both side electrodes. When the frame 11 is made of metal, an insulating material is interposed so as not to make conductive contact with the SiC plate 1 or the electrodes. The electrodes 2 and 3 are connected to the power supply device 12.

FIG. 5 shows a device configuration for controlling the humidifier of the present invention. A humidity detector 14 is installed in the air passage downstream of the porous SiC plate 1. As the humidity detector 14, it is convenient to use a humidity converter using a polymer thin film capacitance type element. The detection signal of the humidity detector 14 is input to the PID indicator controller 15. The PID indicator controller 15 compares the set value with the detection signal of the humidity detector 14, and outputs a control signal to the power adjuster 16 in the direction in which the detection signal approaches the set value. The power regulator 16 applies power to the electrodes 2 and 3 based on this control signal. It is convenient to use a phase control type power controller. With such a simple feedback control, a high-precision relative humidity generator can be constructed.

The humidification characteristics of the humidifier of the present invention will be described below according to the test results conducted by the present inventors.

The humidifier of the present invention shown in FIGS. 3 to 4 is installed in a duct of 200 mm × 150 mm so that the porous SiC plate 1 is parallel to the wind direction, that is, the wide side of the plate 1 is in the wind direction. It was arranged so as to be parallel. The porous SiC plate 1 is a high temperature sintered product having a SiC content of 98% or more, with a pore diameter of 0.8 mm minimum, 3.0 mm maximum, and a porosity of 88%. The dimensions are thickness = 10 mm, height = 60 mm, width = 150 mm.

An axial fan was installed on the outlet side of the duct, and air was drawn into the duct from the inlet side. Humidity converters were inserted in the ducts 300 mm upstream and 1500 mm downstream of the humidifier, and the temperature and humidity of the air at the inlet and outlet of the humidifier were measured. In addition, an anemometer was inserted at a position of 1300 mm in the duct downstream of the humidifier to measure the wind speed. In addition, punching metal was fitted in the position of the duct 500 mm downstream of the humidifier to rectify the air.

The water supply amount was 0.7 to 1.7 kg / h, the wind speed was 1 to 5 m / s, and the water supply temperature and the drainage temperature from the water receiving van were measured with a thermistor. The humidification amount was calculated from the weight difference between the water supply amount and the drainage amount. Also, three thermistors were placed on each side of the wide side of the porous SiC plate, and the surface temperatures were measured. The temperature of the air taken in the duct was 22 to 23 ° C, and the temperature of the water supply was 19 to 20 ° C.

FIG. 6 shows the results of measuring the relationship between the applied power and the amount of humidification. At that time, the amount of water supplied was varied within the range of 0.7 to 1.7 kg / h and the wind speed within the range of 1 to 5 m / s at each applied power. From the results in Fig. 6, it can be seen that the humidification amount is almost linearly proportional to the applied power even if the water supply amount and the wind speed change.

FIG. 7 shows the results of measuring changes in the humidification amount when the absolute humidity of the inlet air is changed. The applied power was 450W (square mark), 230W (+ mark), and 50W (◇ mark). From the results in Fig. 7, it can be seen that the amount of humidification is constant regardless of the humidity of the inlet air before humidification for each applied power.

FIG. 8 is a diagram in which the humidification capacity per 1 kw at each electric power is calculated from the data of FIG. 6 in which the water supply amount is changed in the range of 0.7 to 1.7 kg / h and the wind speed is changed in the range of 1 to 5 m / s. .. As a result, the humidifying capacity of this humidifier due to energization heat generation was 1.1 kg / h.kw.

From these results, it can be seen that the humidifier of the present invention uniformly determines the humidification amount by the applied power even if the wind speed, the water supply amount, and the inlet air humidity change. This relationship is expressed by the following equation. Humidification amount (kg / h) = 1.1 x applied power (kw)

FIGS. 9 and 10 show the response of the humidification amount and the surface temperature of the porous SiC plate when the applied power is switched to 0 or 470 W. The water supply rate was 1.2 kg / h and the wind speed was constant at 2 m / s. From these results, it can be seen that the amount of humidification is very responsive. Also, under the conditions of water supply and wind speed, the time constant was 33 seconds or less for humidification and 22 seconds or less for the surface temperature.

FIG. 11 shows the ratio (%) of the amount of power used for humidification under each applied power of the display. That is, in the figure, ● indicates the amount of electricity used for humidification, + indicates the amount of electricity discharged as the drain water temperature rises, and ○ indicates the amount of electricity used for air temperature rise. From the results shown in the figure, it can be seen that about 60 to 80% of electric power was used for humidification. Moreover, it can be seen that the greater the applied power, the greater the proportion of the amount of power used for humidification.

FIG. 12 shows the amount of heat generated (Kcal) per 1 kg of water when humidified under each applied electric power shown. From the results in the figure, it can be seen that the hot-water ratio during humidification tends to decrease as the applied power increases. The heat-moisture ratio when 500 W was applied was about 729 Kcal / kg.

[0029]

[Effect of the device]

 As described above, the humidifier of the present invention has an excellent effect that the humidifying amount can be controlled only by controlling the applied electric power, irrespective of changes in the inlet air volume, humidity, water supply amount, and the like. In addition, the responsiveness is good and the humidification efficiency of power consumption is high. For this reason, the controllability is extremely good, and it becomes possible to precisely maintain the set relative humidity. According to actual experiments, precise control was possible within the range of ± 1.1% RH relative to the set value of relative humidity.

[Brief description of drawings]

FIG. 1 is a porous plate-like body (porous SiC) of the humidifier of the present invention.
It is a top view which shows the connection relation of a board and an electrode.

[Fig. 2] Porous plate (porous SiC) of the humidifier of the present invention
It is a front view which shows the connection relation of a board and an electrode.

FIG. 3 is a vertical sectional view showing an embodiment of the humidifier of the present invention.

FIG. 4 is a vertical cross-sectional view of the humidifier of FIG. 3 taken along another plane.

FIG. 5 is a device layout view for explaining a control operation of the humidifier of the present invention.

FIG. 6 is a diagram showing the relationship between applied power and humidification amount of the humidifier of the present invention.

FIG. 7 is a diagram showing a change in humidification amount when the absolute humidity of the inlet air to the humidifier of the present invention is changed.

FIG. 8 is a diagram showing the relationship between the applied power and the humidifying capacity of the humidifier of the present invention.

FIG. 9 is a diagram showing a humidification response when electric power is applied to the humidifier of the present invention.

FIG. 10: SiC when power is applied to the humidifier of the present invention
It is a figure which shows the heating response of a board.

FIG. 11 is a view showing a ratio of electric power used for humidification in the humidifier of the present invention.

FIG. 12 is a diagram showing the relationship between the amount of electric power and the hot-moisture ratio in the humidifier of the present invention.

[Explanation of symbols]

 1 Porous Plate (Porous SiC Plate) 2, 3 Electrode 4 Layer of Inorganic Fiber 5 Water Supply Pipe 6 Nozzle Port of Water Supply Pipe 8 Water Receiving Van 10 Insulating Layer 11 Frame Frame 14 Humidity Detector 15 PID Indicator Controller 16 Power Regulator

Claims (5)

[Scope of utility model registration request] 1. A porous plate having a three-dimensional network structure made of sintered SiC is arranged in an air passage such that its wide surface side is substantially vertical, and the inorganic fiber is in contact with the upper surface of the porous plate. Layer is provided, and a water supply pipe is arranged so that the entire inorganic fiber layer is impregnated with water. Under the porous plate, the lower part of the plate is below the water surface. An air humidifier provided with a receiver, and electrodes for energizing the plate-like body attached to both sides of the porous plate-like body. 2. The porous plate-like body is composed of 98% or more of SiC and has a pore diameter in the range of 0.8 to 3.0 mm and a porosity of 80.
The air humidifier according to claim 1, which has a specific resistance of 3% to 18 Ω · cm. 3. The air humidifier according to claim 1, wherein the inorganic fiber comprises rock wool, glass wool or kaolin wool. 4. The porous plate-like body is in contact with a fixing member other than the electrode via an insulating material.
Air humidifier according to. 5. The electric power applied to the electrodes is controlled so that a detection value of a humidity detector installed in an air passage downstream of the porous plate-like member falls within a set range. The air humidifier according to 3 or 4.