JPH08196634A - Negative ion generator - Google Patents

Abstract

PURPOSE: To generate a lot of air containing negative ions without increasing pressure loss. CONSTITUTION: Air is pumped in a wind tunnel 1, water is ejected in the air, which flows from a nozzle 14 installed in the inside, so as to split it into extremely fine drops, and negative ions are generated in the air. An air inlet side flow path 6 in the wind tunnel 1 has a square internal wall and a vortex flow is generated in the air flowed in the inside of the inlet side flow path 6 so as to accelerate generation of the negative ions. The air flowed out from the inside of the wind tunnel 1 is made to collide and reverse to a drain pan, water drops contained in the air are separated into vapor and liquid, and the negative ions are transported by air force so as to be sent to the outside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for generating negative ions by utilizing the Leonard effect.

[0002]

2. Description of the Related Art Phenomena in which nearby air is ionized when water droplets are divided in association with rain and other precipitation have long been known as the Lennard effect. Leonard is that when water droplets collide with a metal plate and split, ions are generated in the nearby air, and the total amount of charge of the split water droplets is larger than the electric quantity of the first water droplet. It was experimentally found that the total charge of the ions generated at the same time and the electric quantity of the water droplet increased by the splitting are equal, but then Simpson repeated the Leonard's experiment and installed a more precise device. Measured using
The same result as Leonard can occur just by splitting the water droplets in the air, the ions generated in the air are negative ions regardless of the charge of the water droplets, and the water droplets are the same as those generated during the splitting. We have confirmed that we obtain an equal amount of positive charge and reported this (see Meteorology and Electrical Engineering, Hisao Hatakeyama, Minoru Kawano, Iwanami Shoten p.26-27).

Negative ions generated by the ionization of electricity are
In addition to the effects on humans and animals, deodorization, dust removal, bactericidal promotion effect,
Recently, negative ions have come to the spotlight due to their antistatic effect. With regard to the effects on humans and animals in particular, psychological sedative action, hypnotic action, fatigue prevention, fatigue recovery action, analgesic action, diuretic action, bronchial asthma, chronic bronchitis, cold relieving action, refreshing effect, animal rearing It has been experimentally proved that there is a performance improving effect, and attempts to use a negative ion generator in an air conditioning system in order to utilize such a function of negative ions are now being actively made. As a typical method for artificially generating negative ions, a method using corona discharge has been known. In this method, out of positive and negative ions generated by corona discharge, positive ions are captured and negative ions are extracted to the outside. However, this method has a drawback that ozone, nitrogen oxides, etc., which are harmful to the human body, are generated as by-products. In this respect, according to the Leonard effect, since only water droplets are divided, negative ions can be generated without generating harmful components.

A method of generating negative ions by utilizing the Leonard effect is described in, for example, Japanese Unexamined Patent Publication No. 4-141179 (anion production method and apparatus). In short, the method described in this prior example generates fine water droplets from water in a fine water droplet manufacturing machine, and at the same time, blows air at a wind speed of 0.5 to 50 m / sec into the fine water droplets to form fine water droplet mixed air, Then, this fine water droplet mixed air is passed through a separator to separate fine water droplets having a particle size of at least 1 μm into ultrafine water droplet mixed air, and 1 m ^{3 of the} ultrafine water droplet mixed air contains anions (negative ions). 1.25x
10 ⁹ or more are generated.

According to this prior art example, a rotating disk or an impeller is used in a machine for producing fine water droplets, and high-pressure water is jetted into this to break the water into fine water droplets. In this precedent,
An example of using an ultrasonic humidifier as a machine for producing fine water droplets is also described, but in short, when energy is applied to water and it collides with a metal plate, it splits into fine water droplets and negative ions are generated in the air in the vicinity. It seems that this is a faithful reproduction of the Leonard effect.

On the other hand, a cyclone separator is used as a separator for performing gas-liquid separation. Cyclone separator improves the separation performance by increasing the wind speed, and the particle size is 1
It is possible to separate gas and liquid at the level of μm. Moreover, if a cyclone separator is used for the gas-liquid separator, it is possible to spray a water flow on the inner wall of the body of the cyclone separator to break it up into fine water droplets, and combine the functions of the generation of fine water droplets and gas-liquid separation. Obtainable.

[0007]

However, since the cyclone separator performs the gas-liquid separation by utilizing the centrifugal force action of the swirling flow of the high-pressure air flow, it requires high energy for the gas-liquid separation. Yes, a high-power blower is required, and a certain length must be secured in the body of the cyclone for centrifugal separation of gas and liquid. This is a great limitation in downsizing the negative ion generator.

It is true that the cyclone separator is excellent in gas-liquid separation performance and is suitable as a separator for separating water droplets from the gas to take out negative ions, but a small negative ion to be installed in the office or the room of a general household. Incorporating a cyclone separator into the generator is not always effective.
However, it is necessary to remove the fine water droplets contained in the gas, but the gas-liquid separation is not necessarily inevitable by centrifugation.

An object of the present invention is to provide a negative ion generator which separates fine water droplets generated in air during aerodynamic transport and supplies air containing negative ions without specially incorporating a separator. Especially.

[0010]

In order to achieve the above object, the negative ion generator according to the present invention is a negative ion generator having a wind tunnel, a water injection device, a blower, and a drain pan. The wind tunnel has a gas inlet / outlet on the lower surface, makes one round of the gas received from the inlet and sends the gas to the outside from the outlet, and has an eddy current generation portion inside,
The eddy current generation part is a part that interferes with the laminar flow of the gas flowing in the wind tunnel to generate a vortex, the water injection device has a nozzle, and the nozzle causes water to flow into the gas flowing in the wind tunnel. The blower creates a high-speed airflow in the wind tunnel,
Negative ions generated in the gas are pneumatically transported.The drain pan is installed below the outlet of the wind tunnel, receives and eliminates water droplets generated in the wind tunnel, and sends them out from the outlet of the wind tunnel. The generated gas is subjected to collision reversal to form a gas-liquid separation surface of water droplets contained in the gas.

Further, the wind tunnel has an inlet side flow passage and an outlet side flow passage, the inlet side flow passage and the outlet side flow passage communicate with each other in the wind tunnel, and the inlet side flow passage has a rectangular shape. The inner corner of the square shape forms a gas swirl generation part, and the outlet side flow path is surrounded by an arcuate wall that forms a smooth laminar flow in the gas flow. .

Further, the entrance and exit of the wind tunnel is separated by a partition plate, and the partition plate divides the interior of the wind tunnel into an inlet side flow passage and an outlet side flow passage, and has a constant angle posture along the gas flow direction. Installed to reduce the pressure loss of the gas on the gas inflow side and the gas outflow side.

Further, the nozzle is mounted on a water supply pipe which is arranged across the central portion of the wind tunnel, and jets water against the flow direction of the gas sent into the wind tunnel.

Further, there is a pipe in the wind tunnel, and the pipe is for heating and cooling, and the temperature of the delivery gas is adjusted by exchanging heat with the gas flowing through the wind tunnel through cold water or hot water.

In addition, two or more units are assembled in the same casing above and below the combination of the wind tunnel, the water injection device, and the drain pan as one unit.
The air blower has an intake window and an air blow window, and a single blower is installed in the uppermost stage in the casing. The blower applies a suction force to each unit in common. Outside air is sent to each unit by the suction force, and the air sending window sends negative air ions pneumatically carried from each unit by a blower into the outside air.

[0016]

In the present invention, water is injected into the gas flowing into the wind tunnel, and the water splits into water droplets to generate negative ions in the air. While the gas flows back inside the wind tunnel, Repeated collisions with the inner wall of the wind tunnel generate a vortex and promote the generation of negative ions.
The water film formed on the drain pan is collided and reversed to separate and remove water drops in the gas, and the gas containing negative ions is taken out of the machine.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 3, in the device of the present invention, the combination of the wind tunnel 1, the water injection device 2, and the drain pan 15 is defined as one unit U, and the three units U, U, U and one blower 3 are combined, It is built in the casing 4. Wind tunnel 1
A gas flow path is formed, and the inside of the wind tunnel 1 is shown in FIG.
Inlet side flow path 6 and outlet side flow path 7
It is divided into and. In FIG. 4, which is an enlarged view of FIG. 1, the partition plate 5 partitions the inside of the wind tunnel 1 into an inlet side flow passage 6 and an outlet side flow passage 7 in a posture inclined at a certain angle from a vertical axis to form a gas return passage. At the same time, the lower end of the partition plate 5 is inserted into the water reservoir 8 of the drain provided for the gas, and separates the inlet 9 and the outlet 10 opened on the lower surface of the wind tunnel 1.

The inclination direction of the partition plate 5 is set so as to be an upward inclination direction with respect to the inlet side flow passage 6 and a downward inclination direction with respect to the outlet side flow passage 7, and 15 ° to 25 °. It is tilted at an angle of °. Wind tunnel 1 forming the inlet side flow path 6
The cross-sectional shape of the inner wall is rectangular, and the cross-sectional shape of the wind tunnel inner wall forming the outlet side flow path 7 is arcuate.

Further, the flat upper surface 11a of the inner wall of the wind tunnel forming the inlet side flow path 6 is inclined upwardly to the arcuate inner wall at an angle of about 5 °, and is connected to the side wall 11b rising vertically at an angle. There is. Also, the vertical surface of the side wall 11b has a lower edge of 45 °
At a certain angle, a certain range is folded back inward, the terminal is further bent at an angle orthogonal to the partition plate 5, and this is opposed to the partition plate 5 to form an inlet 9 therebetween.

On the other hand, the inner wall 12 of the wind tunnel 1 forming the outlet side flow path 7 is formed into an arc surface having a constant radius, the lower edge of which extends parallel to the partition plate 5, and the end portion is bent. The first eliminator 16a is used as the parallel extension 12a of the inner wall and the partition plate 5
The outlet 10 is formed between

The water injection device 2 comprises a water supply pipe 13 which is installed at the center of an arcuate inner wall 12 across the wind tunnel 1 and a nozzle 14 which is provided around the water supply pipe 13. The water supply pipe 13 is for sending water pumped up by a separate pump (not shown) to the nozzle 14, and the nozzle 14 is the water supply pipe 1
3 is provided at a peripheral portion of the peripheral surface, and has a jet port for jetting water in a direction opposite to the flow of air sent into the wind tunnel 1. In the embodiment, as shown in FIG. 2, an example is shown in which the water supply pipe 13 is provided with the nozzles 14 at a constant pitch by shifting the positions in the axial direction and the circumferential direction.

A drain pan 15 is disposed below the wind tunnel 1, and an end of the drain pan 15 rises upward and a rising end is bent inward to serve as a second collision surface for gas flowing out from the outlet 10.
In addition to forming the eliminator 16b, the third eliminator 16c is attached to a part of the rising portion in a tilted posture. A weir 17 is projectingly provided on the drain pan 15, and the lower end of the partition plate 5 that separates the inlet 9 and the outlet 10 is inserted below the height of the weir 17 of the drain pan 15, and the inlet 9 of the wind tunnel 1 is inserted. The water that forms the water reservoir 8 and overflows the weir 17 is drained from the drain port 18 through the drain pan 15 at a position immediately below. Further, the gap between the weir 17 and the partition plate 5 also serves as a bypass passage for releasing an excessive air pressure.

In FIG. 3, the blower 3 includes a casing 4
The outside air is sucked in through the intake window 19 provided in the center of the front of the
The air is blown into the outside air from the air supply window 20 of the casing 4 via each unit U, and is installed on the upper portion of the casing 4.

Each unit U is installed in the casing 4 in upper and lower three stages, shares one blower 3, and receives the suction force of the blower 3 to each unit U through the intake window 19. Outside air is sent.

In the embodiment, when the blower 3 is started,
Due to the suction force, the outside air is sucked through the intake window 19 of the casing 4 and passes through the inside of the wind tunnel 1 to pneumatically transport the negative ions generated in the wind tunnel 1 of each unit U, and through the blower 3 to the casing. Air containing negative ions is sent to the outside air through the air sending window 20 of No. 4.

In the present invention, the generation mechanism of negative ions is as follows. The negative ion generation mechanism will be described below with reference to FIG. Prior to the operation of the blower 3, the water in the water tank (not shown) is fed into the water supply pipe 13 at high pressure, and the water is jetted from the nozzles 14 all at once. The water ejected from the nozzle 14 scatters in the tangential direction of the water supply pipe 13, and the wind tunnel 1
And collide with the inner wall of the wind tunnel 1 to be split, the inside of the wind tunnel 1 is filled with the split water drops, and most of it falls along the inner wall of the wind tunnel 1.

The water that has fallen along the inlet side flow path 6 of the wind tunnel 1 is filled in the water reservoir 8, and the water overflowing the weir 17 is drained to the drain port 18 through the drain pan 15, and the water tank (not shown). ). When the operation of the blower 3 is started, the outside air is sucked into the wind tunnel 1 of the unit through the inlet 9 opened at the lower part of the wind tunnel 1, flows from the inlet side flow passage 6 to the outlet side flow passage 7, and Water is ejected from the nozzle 14 in the direction opposite to the flow direction of the gas, and the kinetic energy of the gas is received to promote the splitting of water droplets. Based on the Leonard effect and Simpson theory, a large amount of negative ions are generated in the gas. Occurs in. When the gas flows into the inlet side flow path 6 of the wind tunnel 1,
Since an excessive pressure loss does not occur because it flows along the inclination direction of the partition plate 5, basically, the inflowing gas first collides with the partition plate 5 and is introduced into the inlet side flow passage 6, and While repeatedly colliding with the inner wall of No. 1 one after another, the fluid flows from the inlet side flow passage 6 toward the outlet side flow passage 7. In particular, the wind tunnel 1 of the inlet side flow path 6
Since the inner wall of No. 1 is rectangular, a vortex is generated at each corner of the inner wall of the wind tunnel as shown in FIG. 4, and water droplets are entrained in the vortex and the splitting thereof is further promoted.

Also in the outlet side flow path 7, water is continuously jetted into the flowing gas, and the jetted water splits into fine water droplets to generate negative ions. The gas repeatedly collides with the inner wall of the wind tunnel while flowing through the outlet-side flow passage 7, but basically forms a laminar flow and does not generate a vortex in the embodiment. However, while the gas repeatedly collides with the inner wall of the wind tunnel 1 and flows, negative ions are generated due to the so-called Leonard phenomenon, and at the same time, the water droplets contained in the gas collide with each other and the arc-shaped inner wall 12 of the wind tunnel 1 and the partition wall. It adheres to the plate 5 and is removed from the gas. The gas flowing downward from the outlet 10 collides with the drain pan 15 and reverses upward, and after reversing, it collides with the second and third eliminators 16b and 16c in sequence and the water droplets contained in the gas are vaporized. The liquid is separated, and the negative ions generated in the wind tunnel 1 of each unit U are pneumatically transported and sent out to the outside air through the air sending window 20. The water trapped on the inner wall of the wind tunnel 1 and the partition plate 5 forms a water film and travels along the inner wall of the wind tunnel and the partition plate 5 to fall onto the drain pan 15 and then to the inlet side flow path 6 side. The formed water is blocked, forms a water reservoir 8 and maintains a constant water level, and the water that has dropped onto the drain pan 15 from the outlet side flow path 7 side passes through the drain port 18 to a water tank (not shown) as it is. Return and repeat circulation. When the gas flows into the wind tunnel 1, a part of the water stored in the water reservoir 8 just below the inlet-side flow path 6 is blown off by the wind pressure, and the water is divided into fine water droplets, which are negative ions. Increase generation efficiency.

The angle of 5 ° formed by the side wall of the wind tunnel 1 forming the inlet-side flow path 6 and the upper surface 11 is an angle determined experimentally for gas collision and eddy current generation. In the present invention, in order to effectively generate negative ions in the wind tunnel 1 and perform gas-liquid separation more effectively, the flow velocity of gas is at least 2 m /
It is necessary to keep at least sec and the amount of water jetted from the nozzle to be 2.5 times or more the amount of air of gas.

In the present invention, in preparation for use as an air-conditioning facility for generating negative ions, inside the wind tunnel 1, particularly along the arcuate inner wall 12 of the wind tunnel 1 forming the outlet-side flow passage 7, FIG.
As described above, a pipe 21 for circulating cooling water or hot water is attached. As a result, the gas flowing into the wind tunnel 1
The temperature of the delivery gas can be controlled to a desired temperature by exchanging heat with the cooling water or hot water in the pipe 21.

In the above embodiments, three units are installed in the casing and the suction force of one blower acts on the three units at the same time, but the number of units installed in the casing is not limited. . Of course, one unit and one blower may be incorporated in the casing to downsize the device. Furthermore, drain pan 15
Has an important function for gas-liquid separation, but the weir 17 on the drain pan 15 is not always necessary. In short, during normal use, the inlet 9 and the outlet 10 of the wind tunnel 1
Are separated by the partition plate 5, and the gas delivered from the outlet 10 of the wind tunnel 1 is collided and reversed on the drain pan 15 to perform gas-liquid separation. Water may be stored in the drain pan 15 just below the outlet 10 of the wind tunnel 1. When water is stored in the drain pan, the gas collides with the water surface and inverts to separate into gas and liquid. The vortex flow generating portion is not limited to the embodiment, and can be formed by providing a partition or the like in the wind tunnel to disturb the laminar flow of gas.

(Examples) Examples of the present invention will be shown below.
The amount of generated ions was measured using a negative ion generator having the specifications shown below.

1. Casing (1) Dimensions Width (L) 1550mm, Depth (W) 55
0mm, height (H) 1950mm Number of units: 3 steps 2. Unit specifications (1) Dimensions (M) ◎ Wind tunnel dimensions Diameter (W) 300 mm x length (L) 1
500 mm (2) Inlet side flow path Vortex generation part: Angle between side surface and upper surface 95 ° Wind tunnel length: 1500 (L) mm ◎ Inlet opening size: 64 (W) mm x 1500 (L) m
m ◎ Exit opening size: 30 (W) mm × 1500 (L) m
m ◎ Partition plate inclination angle: 23 ° ◎ Water pool and bottom size: 60 (W) mm × 1500
(L) mm x 30 (H) mm ◎ Water tank: 500 (W) mm x 1500 (L) mm x 25
0 (H) mm (3) Nozzle (per unit) Nozzle number: 17 (arranged in a spiral on the pipe) Nozzle diameter: 3φ mm 3. Blower (for 3-stage operation) Power: 3φ × 200V × 60Hz × 1.5HP 4. Pump (for 3-stage operation) Power: 3φ × 200V × 60Hz × 2HP

The following equipment was used for measuring negative ions.・ Measurement of air volume: Hiyoshi Denki SS hot wire anemometer (AP
-120) ・ Ion measurement Ion counter (8)
7-1001A) ・ Hygrometer: Small temperature / humidity recorder (dot type) made by Chino Co., Ltd. HN-U2 Temperature / humidity sensor HN-L18

Water injection pump pressure from the nozzle 2.5 kg
Tap water is filled in the water tank at / cm ² , and water is sprayed,
The following results were obtained when the amount of ions was measured through the air supply window. Ion amount Negative ion amount: 70,000-73,000 / cc Positive ion amount: 1,800-2,200 / cc However, Air volume: 52 m ³ / min Inlet wind velocity: 2.5 m / sec Outlet wind velocity: 3 0.0m / sec Temperature: 18 ° C Humidity: 98% RH

Table 1 shows the results of changes in the amount of negative ions generated due to the difference in injection pump pressure.

[0037]

[Table 1] (Note 1) L / G is the ratio of water injection amount / air amount.

Table 1 shows the amount of negative ions generated by the injection pump pressure when the air volume is constant.
In the above cases, the amount of negative ions generated was 50,000 or more / cc.

◎ Cooling and heating piping Copper tube (diameter: 15.88φmm, surface area: 0.05m ²
/ M) is installed in the wind tunnel, the amount of negative ions generated increases by about 20%. It is considered that this phenomenon is due to the fact that the copper tube functioned as an eddy current generation portion due to the arrangement of the copper tubes, and eddy currents were generated in the flowing air current.

For reference, one using a cylinder having a diameter of 300 mm and a length of 600 mm for the wind tunnel (FIG. 5) and further for FIG.
The one in which a partition having a height of 70 mm is projected into the cylinder (Fig. 6) and the one in which a square tube having a side of 300 mm and a length of 600 mm is used (Fig. 7) are prepared, respectively, and these are sequentially described in Reference Example 1 As Reference Example 2 and Reference Example 3, the amount of negative ions obtained at the exhaust port of the blower was measured. The partition plate that separates the inlet and the outlet was vertical.

The experimental results are as follows.・ Blower 1φ × 100V × 50Hz × 130W ・ Pump 1φ × 100V × 50Hz × 60W ・ Nozzle 0.8mmφ × 18 pieces (arranged spirally) ・ Wind tunnel inlet wind speed 5m / sec ・ Pump pressure 2.5kg / cm ² The measurement results are shown in Table 2.

[0042]

[Table 2]

In Reference Example 1, since the wind tunnel has a circular cross section, the gas flows in a laminar flow in the wind tunnel, and the static pressure in the wind tunnel is small but the amount of negative ions generated is small. Even if the wind tunnel has a circular cross section,
By arranging a partition that prevents smooth flow of gas therein as in Reference Example 2, a vortex flow is generated and the amount of negative ion generation can be increased. However, the static pressure in the wind tunnel increases. It was found that when a rectangular wind tunnel was used as in Reference Example 3, the amount of negative ions increased dramatically, but the static pressure inside the wind tunnel also increased.

Even if the wind tunnel has a circular cross section as in Reference Example 2, by using a screen in the wind tunnel, a vortex flow is generated in the gas introduced into the wind tunnel and becomes a turbulent flow as a whole. It can be seen that turbulence greatly contributes to the generation of negative ions. Those having the eddy current generating portion as in Reference Examples 2 and 3 are also included in the scope of the present invention.

[0045]

As described above, according to the present invention, a large amount of negative ions are generated by causing a vortex flow in the gas flowing in the wind tunnel along with the so-called Leonard effect and splitting the water in the vortex flow of the gas. Therefore, it is possible to provide a negative ion generator with small power and low operating noise. In particular, according to the present invention, it suffices to provide an inlet and an outlet at the bottom of the wind tunnel, partition the cross section of the wind tunnel, and allow the gas to go around the interior of the wind tunnel almost once. Since the gas and liquid are separated by colliding and reversing the plate surface or the water surface on the drain pan, no special device such as a cyclone separator is required for the gas and liquid separation.

Further, according to the present invention, the partition plate for partitioning the inlet and outlet of the wind tunnel is formed by making the cross section of the inflow side flow path of the wind tunnel rectangular and the cross section of the outflow side flow path arc-shaped. If it is placed in a tilted position, the pressure loss during gas inflow and outflow will be small, and a vortex will be generated mainly in the flow path on the inflow side, so the static pressure will be excessive even while flowing in the wind tunnel. There is no. ADVANTAGE OF THE INVENTION According to this invention, the piping for heating and cooling can be easily installed, and it is small and quiet, and the indoor installation type negative ion generator,
It has the effect of providing air conditioning equipment.

[Brief description of drawings]

FIG. 1 is a sectional view of a unit showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a view showing an embodiment of the present invention incorporated in a casing.

FIG. 4 is a diagram showing a procedure for generating negative ions according to the present invention.

5 is a configuration diagram of Reference Example 1. FIG.

6 is a configuration diagram of Reference Example 2. FIG.

7 is a configuration diagram of Reference Example 3. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wind tunnel 2 Water jet device 3 Blower 4 Casing 5 Partition plate 6 Inlet side flow path 7 Outlet side flow path 8 Water reservoir 9 Inlet 10 Outlet 11a Upper surface 11b Side wall 12 Circular inner wall 13 Water supply pipe 14 Nozzle 15 Drain pan 16a, 16b , 16c Eliminator 17 Weir 18 Drainage port 19 Intake window 20 Air supply window 21 Piping

Claims (6)

[Claims] 1. A negative ion generator having a wind tunnel, a water injection device, a blower, and a drain pan, wherein the wind tunnel has a gas inlet / outlet on a lower surface, and the gas received from the inlet goes around. The air is sent from the outlet to the outside,
It has a vortex generator inside, and the vortex generator is a part that disturbs the laminar flow of gas flowing in the wind tunnel to generate a vortex. The blower blows water into the gas flowing inside, and the blower creates a high-speed airflow in the wind tunnel to pneumatically transport the negative ions generated in the gas.The drain pan is the wind tunnel. Is installed below the outlet of the wind tunnel to receive and eliminate water droplets generated in the wind tunnel, and to invert the gas delivered from the outlet of the wind tunnel to form a gas-liquid separation surface of water droplets contained in the gas. A negative ion generator characterized by being a thing. 2. The wind tunnel has an inlet-side flow passage and an outlet-side flow passage, the inlet-side flow passage and the outlet-side flow passage communicate with each other in the wind tunnel, and the inlet-side flow passage has a rectangular shape. It is characterized in that the corners of the square shape form the vortex generation part of the gas, and the outlet side flow path is surrounded by the arcuate wall that forms a smooth laminar flow in the gas flow. The negative ion generator according to claim 1. 3. The entrance and exit of the wind tunnel is separated by a partition plate, and the partition plate divides the interior of the wind tunnel into an inlet-side flow passage and an outlet-side flow passage, and has a constant angle posture along the gas flow direction. 3. The negative ion generator according to claim 2, wherein the negative ion generator is installed in the air conditioner and reduces pressure loss of the gas on the gas inflow side and the gas outflow side. 4. The nozzle is mounted on a water supply pipe that is arranged across the central portion of the wind tunnel, and jets water against the flow direction of the gas sent into the wind tunnel. The negative ion generator according to claim 1. 5. A pipe is provided in the wind tunnel, the pipe is for heating and cooling, and the temperature of the delivery gas is adjusted by exchanging heat with the gas flowing through the wind tunnel through cold water or hot water. The negative ion generator according to claim 1, 2, 3, or 4. 6. A combination of a wind tunnel, a water injection device, and a drain pan is taken as one unit, and two or more units are installed in the same casing above and below, and the casing has an intake window and an air supply window. In the casing, one blower is installed in the uppermost stage, and the blower applies a suction force to each unit in common, and the intake window uses the suction force of the blower to draw outside air into each unit. The negative ions according to claim 1, wherein the negative air ions are pneumatically transferred from each unit, and the negative ions are pressure-fed by a blower to the outside air. Generator.