JPH02213630A - Humidifying device - Google Patents

Abstract

PURPOSE:To effect humidification, to prevent adhesion of fur, and to facilitate maintenance management by a method wherein atomized water is brought into contact with a vaporizing surface the temperature of which is maintained at a value higher then the vaporizing temperature of water, and film boiling is produced on a vaporizing surface. CONSTITUTION:A humidifying device brings water atomized through a nozzle 2 into contact with a vaporizing surface 1 the temperature of which is maintained at a value approximately 50 deg.C higher than the vaporizing temperature of water, causes film boiling of water atomized on the vaporizing surface 1 to gasify it, and performs humidification by means of steam. The vaporizing surface 1 is formed as the one surface of a metallic plate 2a, and an electric heater 3 is embedded in the metallic plate 2a. A specified amount of water is fed from a water tank 4 with the aid of a self-suction type pump 5, water discharged through the nozzle 2 produces fine particles with a grain size of 50-100mum, a part of the fine particles flows on the air flow of a blower 6, a part thereof flows to the vaporizing surface 1 for immediate gasification, and is discharged as humidifying air togetherwith the air flow of the blower 6. Since a time in which a moisture content resides on the vaporizing surface 1 is reduced to almost zero, calcium chloride and magnesium chloride, contained in water, are prevented from being deposited and adhered as fur, and maintenance management is also facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] This invention relates to a humidifier equipped with a vaporization device using film boiling.

[Prior Art] Conventionally, humidifiers include ultrasonic type humidifiers, vaporization type humidifiers, and the like. In the ultrasonic method, an electrostrictive or magnetostrictive vibrator is placed in water, and the waves collide with each other to emit water particles. The vaporization type heats and vaporizes water using Joule heat using an electric heater. In addition to these, there are also devices that allow air to come into contact with or pass through a moisture-permeable membrane or a fibrous member containing water, and all of these devices perform a sufficient humidifying function.

[Problems to be Solved by the Invention] All of the conventional humidifiers described above have problems in that water scale easily adheres to the vibrator, electric heater, moisture permeable membrane, etc., and maintenance is required to remove the adhered water scale. Contains tasks to be done.

Additionally, electric heaters consume a lot of power due to the latent heat required to vaporize the water, and have the problem of increasing maintenance costs.

The present invention has been made to solve such conventional problems, and an object of the present invention is to provide a humidifying device that is free from limescale adhesion and is easy to maintain.

[Means for Solving the Problems] The humidifying device according to the present invention has a temperature lower than the evaporation temperature of water by 50°C.
Atomized water is brought into contact with an evaporation surface maintained at a moderately high temperature, and film boiling is caused on the evaporation surface to vaporize the water, thereby achieving humidification.

[Operation] In this invention, the water that has become atomized on the evaporation surface undergoes film boiling and is vaporized, so the latent heat of vaporization is reduced, and since there is almost no time for water droplets to remain on the evaporation surface, the water contained in the water is Rusium chloride, magnesium chloride, sodium chloride, etc. will not precipitate and adhere as water scale.

[Example] Figures 1 to 4 all show an example of the present invention. The humidifying device shown in this example brings atomized water through a nozzle 2 into contact with an evaporation surface 1 maintained at a temperature approximately 50°C higher than the evaporation temperature of water, and film-boils the atomized water on the evaporation surface 1. This device is equipped with a vaporizer that vaporizes water, and the steam obtained by the vaporizer is used to humidify the air.

The evaporation surface 1 is configured as one surface of a metal plate 2a or the like, and an electric heater 3 is embedded inside the metal plate 2a or the like to maintain the temperature at about 50° C. higher than the evaporation temperature of water. The nozzle 2 is mounted opposite to this evaporation surface 1 and is connected to a water supply, for example, and draws water automatically from a water tank 4 configured to allow automatic water supply from the water supply (by means of a conventional device such as a ball tap or a float switch). A certain amount of water is sent by a suction pump (plunger pump, diaphragm pump 1, etc.) 5 to form fine particles of 50 to 100 μm. A blower 6 is provided between the nozzle 2 and the evaporation surface 1 facing the nozzle 2 to form a flow of air along the evaporation surface 1.

The one shown in FIGS. 3 and 4 is one in which a hollow ring-shaped vaporizing wind tunnel 7 is connected to the blower 6, and the inner surface of the vaporizing wind tunnel 7 is configured as the evaporating surface 1 as shown in FIG. in,
The air flow of the blower 6 flows along the evaporation surface 1, and the nozzle 2 is arranged in the evaporation tunnel 7, but the principle remains the same as that shown in FIG.

In the humidifying device described above, the water blown out from the nozzle 2 becomes fine particles of 50 to 100 μm. Some of these fine particles ride on the airflow of the blower 6, and some of them directly reach the evaporation surface l.

Since the water vapor pressure of the air (relatively dry) sent by the blower 6 while reaching the evaporation surface 1 is lower than the water vapor pressure around the atomized water, vaporization occurs on the surface of the particulates, causing water to become particulates. is further atomized. The water particles that have reached the evaporation surface 1 receive heat from the evaporation surface 1, undergo film boiling at the portions that come into contact with the evaporation surface 1, are immediately vaporized, and are emitted as humidified air along with the air flow of the blower 6.

Microscopically, the vaporization progresses as shown in FIG. 2, in which the high vapor pressure Pb around the particulates during vaporization is sequentially replaced by the low vapor pressure Pa of the air flow. Generally, the above-mentioned phenomenon is treated as mass transfer, and the amount of evaporation per unit time is determined by the saturated water vapor pressure p at the temperature of the particles.
It is proportional to the difference between b and the water vapor pressure Pa of the surrounding air. In this humidifier, water is vaporized by film boiling on the evaporation surface 1, and the latent heat of vaporization is small, and there is almost no time for water to remain on the evaporation surface 1, so that the chloride power contained in the water is reduced.

Magnesium chloride, sodium chloride, etc. do not precipitate and adhere as water scale, and power consumption is reduced and maintenance is easy.

[Effects of the Invention] As is clear from the above description of the embodiments, the humidifying device of the present invention vaporizes the atomized water sent out from the nozzle by film boiling it on the evaporation surface. The latent heat of vaporization is small, and since there is almost no time for water to remain on the evaporation surface, salts contained in the water do not precipitate and adhere as limescale, and power consumption is low and maintenance is easy. It has a certain effect.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the configuration of a humidifying device as an embodiment of the present invention, Fig. 2 is an explanatory diagram showing the state during vaporization, and Fig. 3 is a perspective view of the humidifying device showing another embodiment. , FIG. 4 is a cross-sectional view taken along line A-A in FIG. . Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] A humidifier comprising a vaporizer that brings atomized water into contact with an evaporation surface maintained at a temperature approximately 50° C. higher than the evaporation temperature of water, and brings the atomized water to film boiling on the evaporation surface.