WO2017159630A1

WO2017159630A1 - Fluid spraying system

Info

Publication number: WO2017159630A1
Application number: PCT/JP2017/010018
Authority: WO
Inventors: 寧森園
Original assignee: 東芝三菱電機産業システム株式会社
Priority date: 2016-03-14
Filing date: 2017-03-13
Publication date: 2017-09-21
Also published as: JPWO2017159630A1; JP6696565B2

Abstract

A fluid spraying system (10) is provided with: a compressed air supply source for supplying compressed air (6); a water supply source for supplying electrically charged water (2); conductivity adjusting means (14, 15) for adjusting the conductivity of the water (2) supplied from the water supply source; and a two-fluid nozzle (1) for spraying a fluid atomized by mixing the water (2) adjusted by the conductivity adjusting means (14, 15) and the compressed air (6) supplied from the compressed air supply source.

Description

Fluid spray system

Embodiment of this invention is related with the fluid spraying system which sprays the fluid.

Conventionally, there is a humidification system that humidifies an indoor space by supplying pure water into the indoor space by using a spray nozzle.

In the humidification system, the sprayed pure water particles are charged and can be attracted to the spray nozzle body, the walls, pillars, pipes, equipment, people passing by the spray nozzle, or products by the Coulomb force. is there.

This can cause equipment failure due to water or static electricity, electric shock, or air discharge problems, so it is narrow and has many obstacles, places with electronic equipment, places where people pass, places where wetting is not allowed, or It is difficult to spray pure water in a place where explosion-proof specifications are required.

JP 2004-344821 A Japanese Patent No. 2921762 JP 2014-188284 A

An object of the present invention is to provide a fluid spraying system that prevents at least a specific portion from getting wet by spraying.

A fluid spray system according to an aspect of the present invention adjusts the conductivity of water supplied from a compressed air supply source that supplies compressed air, a water supply source that supplies charged water, and the water supply source. A conductivity adjusting unit; and a two-fluid nozzle that mixes the water adjusted by the conductivity adjusting unit and the compressed air supplied from the compressed air supply source to spray the atomized fluid.

FIG. 1 is a configuration diagram showing the configuration of the fluid spray system according to the first embodiment of the present invention. FIG. 2 is a graph showing the relationship between the specific resistance of pure water and the amount of carbon dioxide dissolved according to the first embodiment. FIG. 3 is a correspondence diagram showing the relationship between air and carbon dioxide gas according to the first embodiment. FIG. 4 is a correspondence diagram for setting the controller according to the first embodiment. FIG. 5 is a configuration diagram showing the configuration of the fluid spray system according to the second embodiment of the present invention. FIG. 6: is a block diagram which shows the structure in the middle of spraying of the fluid spraying system which concerns on the 3rd Embodiment of this invention. FIG. 7 is a configuration diagram showing the configuration of the circulation duct in the fluid spraying system according to the fourth embodiment of the present invention. FIG. 8 is a configuration diagram illustrating the drip-proof effect of the support according to the fourth embodiment. FIG. 9 is a configuration diagram illustrating a specific example of the configuration of the support according to the fourth embodiment. FIG. 10 is a configuration diagram showing a configuration in the vicinity of the two-fluid nozzle according to the fourth embodiment.

(First embodiment)
FIG. 1 is a configuration diagram showing a configuration of a fluid spraying system 10 according to a first embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same part in drawing, the detailed description is abbreviate | omitted, and a different part is mainly described.

First, the fluid sprayed by the fluid spraying system 10 will be described.

For example, the fluid is pure water. Pure water is obtained mainly by refining tap water. For example, pure water is made as follows.

First, RO water is made by removing impurities from tap water using a reverse osmosis membrane (RO (reverse osmosis) membrane). Deionized water is made by removing ion components and remaining fine impurities from this RO water using an ion exchange resin. This deionized water becomes pure water. In general, the specific resistance of water increases as the purity increases. When the specific resistance of water is increased, the particles are easily charged when water is used as the particles. Specifically, when the specific resistance of water exceeds about 1 [MΩ · cm], charging occurs. Since the specific resistance of pure water produced as described above exceeds 1 [MΩ · cm], it is charged when sprayed.

Note that the pure water 2 used in the fluid spraying system 10 may be purified by a method other than the above method as long as it is purified to increase the purity. For example, the pure water 2 may be RO water or deionized water that does not pass through RO water.

If the fluid spraying system 10 is humidified, temperature adjustment such as cooling or heating may be performed simultaneously. The fluid spraying system 10 includes a two-fluid nozzle 1, a pump unit 3, a material melting unit 4, a regulator 7, a material supply valve 14, a controller 15, and a material supply source 17. The compressed air 6 is supplied to the two-fluid nozzle 1 via the regulator 7.

The air supply path 8 through which the compressed air 6 flows is provided so as to be supplied from the supply source of the compressed air 6 to the air supply port provided in the two-fluid nozzle 1 via the regulator 7. The water supply path 5 through which the pure water 2 flows is provided so as to be supplied from the supply source of the pure water 2 to the water supply port provided in the two-fluid nozzle 1 through the pump unit 3 and the material dissolution unit 4 in order. It is done.

The two-fluid nozzle 1 is a nozzle that mixes liquid and gas and sprays the atomized fluid. In this embodiment, the liquid is pure water 2 and the gas is compressed air 6.

The pump unit 3 is a device for feeding the pure water 2 from the supply source of the pure water 2 to the two-fluid nozzle 1 through the material dissolution unit 4.

The regulator 7 is a device for sending the compressed air 6 into the two-fluid nozzle 1.

The material supply source 17 is a unit that stores the conductivity adjusting material. The conductivity adjusting material is a material for dissolving in pure water 2 in order to increase the conductivity of pure water 2. It is desirable that the conductivity adjusting material does not affect the environment of the space sprayed from the two-fluid nozzle 1 as much as possible. However, the conductivity adjusting material may be any material as long as the sprayed space allows. For example, since carbon dioxide is a component contained in the air, even if sprayed, there is almost no influence on the environment. Hereinafter, the conductivity adjusting material will be described mainly as carbon dioxide gas.

The controller 15 outputs an instruction value for adjusting the opening degree of the material supply valve 14 to the material supply valve 14. An instruction value is set in the controller 15 so that the conductivity of the pure water 2 becomes a target value (target conductivity).

The material supply valve 14 is a valve for adjusting the amount of carbon dioxide supplied from the material supply source 17 to the material dissolution unit 4. The material supply valve 14 determines the opening degree according to the instruction value received from the controller 15. The larger the opening degree of the material supply valve 14, the more carbon dioxide gas is supplied to the material melting unit 4. As the amount of carbon dioxide supplied from the material supply valve 14 increases, the conductivity of the pure water 2 increases.

The material dissolution unit 4 is a unit that dissolves carbon dioxide gas supplied from the material supply source 17 in the pure water 2. For example, a hollow fiber membrane or ceramic is accommodated in the material melting unit 4. The material melting unit 4 mixes carbon dioxide gas into the pure water 2. By dissolving the carbon dioxide gas in the pure water 2, the pure water 2 becomes the target conductivity. For example, the specific resistance of pure water 2 is set to 1.0 MΩ / cm or less as the target conductivity. The material dissolution unit 4 dissolves carbon dioxide gas in the pure water 2 and supplies the pure water 2 that has reached the target conductivity to the two-fluid nozzle 1.

The two-fluid nozzle 1 mixes and sprays pure water 2 in which carbon dioxide gas supplied from the material melting unit 4 is dissolved and compressed air 6 supplied from the regulator 7. Thereby, the two-fluid nozzle 1 sprays the pure water 2 into fine particles.

Referring to FIG. 2, the relationship between the conductivity of pure water 2 and the amount of carbon dioxide dissolved will be described. In FIG. 2, the vertical axis represents specific resistance (conductivity), and the horizontal axis represents the amount of carbon dioxide dissolved.

The specific resistance of pure water 2 having a purity of 100% and not dissolving carbonic acid is about 18.2 MΩ / cm. When the target conductivity (specific resistance) of pure water 2 is 1.0 MΩ / cm, the target conductivity is lowered by dissolving 0.6 mg or more of carbon dioxide in 1 L of pure water.

Referring to FIG. 3, the case where carbon dioxide in the air is dissolved in pure water 2 will be described. In this case, air is stored in the material supply source 17.

In the case of air having a weight of 1293 mg / L and a carbon dioxide concentration of 400 ppm, this air contains 0.517 mg / L of carbon dioxide. Thus, if the concentration of carbon dioxide is known, the weight of air containing the necessary carbon dioxide can be obtained.

Referring to FIG. 4, the setting method of the controller 15 will be described.

In order to set the controller 15, the amount of carbon dioxide injected or the required amount of air dissolved in the pure water 2 is obtained with respect to the target conductivity of the pure water 2. For example, in FIG. 4, when the target conductivity is 1.0 MΩ / cm, the amount of carbon dioxide injected into 1 L of pure water 2 is 0.6 mg, and the required amount of air for 1 L of pure water 2 is 1.2 L. is there. When the target conductivity is 0.6 MΩ / cm, the amount of carbon dioxide injected for 1 L of pure water 2 is 2 mg, and the required amount of air for 1 L of pure water 2 is 3.9 L.

The instruction value for determining the opening degree of the material supply valve 14 is obtained based on the carbon dioxide injection amount or the required air amount thus obtained. The indicated value obtained in this way is set in the controller 15.

According to this embodiment, it is possible to prevent the sprayed pure water 2 from being charged by dissolving the conductivity adjusting material in the pure water 2. Thereby, it is possible to prevent all objects from being wetted by the particles of the pure water 2 sprayed by the fluid spraying system 10. For example, the spray nozzle body, walls around the spray nozzle, pillars, piping, equipment, people passing by, or products are not wetted by the spray from the fluid spray system 10. Therefore, it is not necessary to drip-proof or waterproof these objects.

(Second Embodiment)
FIG. 5 is a configuration diagram showing a configuration of a fluid spray system 10A according to the second embodiment of the present invention.

The fluid spraying system 10A is the fluid spraying system 10 according to the first embodiment shown in FIG. 1 except that the controller 15 is replaced with the controller 15A and a conductivity meter 16 is added.

The conductivity meter 16 is provided in the water supply path 5 that connects the two-fluid nozzle 1 and the material dissolution unit 4. The conductivity meter 16 measures the conductivity of the pure water 2 flowing through the water supply path 5. The conductivity meter 16 transmits the measured conductivity to the controller 15A.

The controller 15 </ b> A determines an instruction value for determining the opening degree of the material supply valve 14 based on the measurement result by the conductivity meter 16. The controller 15A may correct the set instruction value or may newly calculate the instruction value. The controller 15A outputs the determined instruction value to the material supply valve 14.

According to the present embodiment, in addition to the functions and effects of the first embodiment, the following functions and effects can be obtained. The conductivity of the pure water 2 can be controlled by providing the conductivity meter 16 and measuring the conductivity of the pure water 2. Thereby, it can prevent that the electrical conductivity of the pure water 2 is too low. Moreover, when the electrical conductivity of the pure water 2 is high, excessive supply of carbon dioxide can be prevented by reducing the opening of the material supply valve 14 to suppress the supply of carbon dioxide.

(Third embodiment)
FIG. 6 is a configuration diagram showing a configuration during spraying of the fluid spraying system 10B according to the third embodiment of the present invention. Here, parts different from those of the first embodiment will be mainly described.

The fluid spraying system 10B includes a two-fluid nozzle 1, a pressure tank 31, a supply tank 32, a water supply valve 33, six

check valves

34, 35, 36, 37, 38, 39, a water electropneumatic regulator 40, and air. An electropneumatic regulator 41 and a three-way valve 42 are provided. These devices are connected by piping such as the water supply path 5 or the air supply path 8.

The electropneumatic regulator 41 for air is provided in the air supply path 8 between the supply source of the compressed air 6 and the two-fluid nozzle 1. The electropneumatic regulator 41 for air makes the pressure of the compressed air 6 supplied to the two-fluid nozzle 1 a desired value.

The water electropneumatic regulator 40 is provided in the air supply path 8 between the supply source of the compressed air 6 and the pressure tank 31. The water electropneumatic regulator 40 controls the pressure of the compressed air 6 supplied to the pressure tank 31. For example, the water electropneumatic regulator 40 sends the compressed air 6 into the pressure tank 31 at a pressure of 400 kPa. Further, the water electro-pneumatic regulator 40 gives an open command or a close command to an exhaust valve provided in the water exhaust system 9.

The three-way valve 42 is provided in the air supply path 8 between the supply source of the compressed air 6 and the supply tank 32. The compressed air 6 is fed into the supply tank 32 by the three-way valve 42.

The check valve 37 is provided between the water electropneumatic regulator 40 and the pressure tank 31. The check valve 38 is provided so as to connect both ends of the check valve 37 and the pressure tank 31. The check valve 35 is provided between the three-way valve 42 and the supply tank 32. The check valve 36 is provided so as to connect both ends of the check valve 35 and the supply tank 32. A check valve 39 is provided in the water supply path 5 between the pressure tank 31 and the supply tank 32.

In each of the pressure tank 31 and the supply tank 32, a high liquid level sensor H and a low liquid level sensor L are provided. By controlling based on these sensors L and H, the following operation is performed. When the pure water in the supply tank 32 decreases, the pure water 2 is automatically replenished to the supply tank 32. When the pure water 2 in the supply tank 32 is full, the supply of the pure water 2 is automatically stopped. The pure water 2 in the pressure tank 31 is supplied to the two-fluid nozzle 1 during spraying. When the pure water 2 in the pressure tank 31 decreases, the pure water 2 in the supply tank 32 is automatically transferred to the pressure tank 31.

Compressed air 6 is supplied from the lower side of the pressure tank 31 through a water electropneumatic regulator 40 and a check valve 38 from the supply source of the compressed air 6. The pure water 2 is sprayed from the two-fluid nozzle 1 to the inside of the pressure tank 31 as much as the volume of the compressed air 6 increases. By inserting the compressed air 6 from the lower side of the pressure tank 31, the air passes through the pure water 2 inside the pressure tank 31 from the lower side to the upper side. By contacting the pure water 2 in the pressure tank 31 with the air, the air (carbon dioxide gas) is dissolved in the pure water 2.

Pure water 2 is supplied to the pressure tank 31 from the supply tank 32 via the check valve 39.

Compressed air 6 is supplied from the lower side of the supply tank 32 through the three-way valve 42 and the check valve 36 from the supply source of the compressed air 6. The pure water 2 is transferred to the pressure tank 31 by an amount corresponding to the increase in volume of the compressed air 6 in the supply tank 32. By introducing the compressed air 6 from the lower side of the supply tank 32, the air passes through the pure water 2 inside the supply tank 32 from the lower side to the upper side. By bringing the pure water 2 in the supply tank 32 into contact with air, the air is dissolved in the pure water 2.

Pure water 2 is supplied to the supply tank 32 from a supply source of pure water 2 through a water supply valve 33 and a check valve 34 in order.

The pure water 2 supplied from the water supply valve 33 has a conductivity (specific resistance) that is easily charged to 1.0 MΩ / cm or more. The electrical conductivity of the pure water 2 is increased by making the pure water 2 come into contact with the air in the pressure tank 31 and the supply tank 32. Thereby, the pure water 2 supplied from the pressure tank 31 to the two-fluid nozzle 1 has a conductivity that is less than 1.0 MΩ / cm and is difficult to be charged. If the conductivity of the pure water 2 is sufficiently increased, the air may be dissolved in the pure water 2 by either the pressure tank 31 or the supply tank 32.

According to the present embodiment, the conductivity of the sprayed pure water 2 can be increased without using a conductivity adjusting material such as carbon dioxide. Thereby, the effect similar to 1st Embodiment can be acquired.

(Fourth embodiment)
FIG. 7 is a configuration diagram showing the configuration of the circulation duct 20 in the fluid spray system according to the fourth embodiment of the present invention.

The basic configuration of the fluid spray system according to the present embodiment is obtained by removing the configuration in which the conductivity adjusting material is mixed with the pure water 2 in the fluid spray system 10 to 10B according to any one of the first to third embodiments. It is the same. Therefore, in this embodiment, since the conductivity adjusting material is sprayed without being mixed with the pure water 2, the sprayed pure water particles (spray particles) have a property of being charged.

The circulation duct 20 is a duct that is sprayed from the two-fluid nozzle 1 to humidify the inflowing air and send out the humidified air. The air flow Sa passing through the circulation duct 20 enters the horizontal direction from the side where the two-fluid nozzle 1 is provided, and exits in the vertical upward direction. The circulation duct 20 is made of metal. The circulation duct 20 is supported by a metal column 21 provided inside. For example, the height of the column 21 is about 3 meters.

FIG. 8 is a configuration diagram showing the drip-proof effect of the support column 21.

The outer periphery of the column 21 is covered with the insulating member 60 so as to make a complete round. The insulating member 60 is a member that performs electrical insulation. For example, the insulating member 60 is made of polypropylene, fluorine resin, vinyl chloride, polyethylene, or the like.

If it is not covered with the insulating member 60, the metal column 21 draws the charged spray particles. On the other hand, the insulating member 60 covering the support column 21 is charged to the same polarity (positive electrode) as the charged spray particles. Therefore, even if the spray particles come on the support column 21 while riding on the air flow Sa, the spray particle flow Sg is repelled and separated by the Coulomb force. Thereby, wetting of the support column 21 by spray particles is suppressed.

When the outer periphery of the support column 21 is not completely covered with the insulating member 60, the spray particles are concentrated on the portion where the insulating member 60 is not covered. Accordingly, it is desirable that the insulating member 60 has such a length that the outer periphery of the support column 21 is more than one turn and an overlapping portion appears.

FIG. 9 is a configuration diagram showing a specific example of the configuration of the column 21.

The insulating member 60 is a polypropylene film. The thickness of the insulating member 60 is preferably 0.2 mm or more, but at least 0.1 mm or more is necessary. The insulating member 60 is wound about 1.5 times around the outer periphery of the column 21. In this manner, the insulating member 60 is fixed by the insulation lock 61 in a state where the insulating member 60 is wound around the column 21.

Also, the inner wall surface and floor surface of the circulation duct 20 are pasted without gaps so as to be covered with an insulating member 60 such as a polypropylene film in the same manner as the support column 21.

FIG. 10 is a configuration diagram showing a configuration in the vicinity of the two-fluid nozzle 1 according to the present embodiment.

A water supply path 5 and an air supply path 8 are connected to the two-fluid nozzle 1. The material of the water supply path 5 is an insulating member. The material of the air supply path 8 is made of metal. Therefore, the air supply path 8 needs to be covered with an insulating member, and the water supply path 5 does not need to be covered with an insulating member.

Next, a method for covering the water supply path 5 with the insulating member 62 will be described.

The insulating member 62 is, for example, a polypropylene heat-shrinkable tube.

The insulating member 62 is put on the air supply path 8 without being thermally contracted. At this time, it covers so that the nipple for attaching the air supply path 8 to the two fluid nozzle 1 may also be covered. The insulating member 62 need not cover the entire air supply path 8 as long as it covers only the portion of the air supply path 8 close to the two-fluid nozzle 1.

In this way, a part of the configuration of the fluid spray system that is not to be wetted is covered with an insulating member. In addition, an object that is not sprayed in the space to be sprayed by the fluid spraying system is covered with an insulating member. For example, in a room where humidification is performed by a fluid spraying system, equipment that is sensitive to water is covered with an insulating member. Moreover, you may cover the wall, pillar, floor, etc. inside this room with an insulating member. Note that the pure water particles sprayed from the two-fluid nozzle 1 release electric charges while floating in the air, and are not charged. Therefore, it is not necessary to cover the part away from the two-fluid nozzle 1 by a certain amount with the insulating member.

According to the present embodiment, by covering the drip-proof object with the insulating member, the charged spray particles sprayed from the two-fluid nozzle 1 are repelled by the Coulomb force and suppressed from adhering to the drip-proof object. be able to.

Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different embodiments may be appropriately combined.

Claims

A compressed air supply source for supplying compressed air;
A water supply source for supplying charged water;
Conductivity adjusting means for adjusting the conductivity of the water supplied from the water supply source;
A fluid spraying system comprising: a two-fluid nozzle that sprays atomized fluid by mixing the water adjusted by the conductivity adjusting unit and the compressed air supplied from the compressed air supply source. .
A material supply source for supplying a material for adjusting the conductivity of the water;
The fluid spray system according to claim 1, wherein the conductivity adjusting means increases the conductivity by dissolving the material supplied from the material supply source in the water.
The fluid spray system according to claim 2, wherein the material is carbon dioxide gas or air.
The fluid spray system according to claim 1, wherein the conductivity adjusting means dissolves the compressed air supplied from the compressed air supply source in the water.
A tank for storing the water supplied from the water supply source;
The fluid spray system according to claim 4, wherein the conductivity adjusting unit dissolves the compressed air in the water by putting the compressed air from a lower side of the tank.
A drip-proof method for a fluid spraying system comprising a two-fluid nozzle for spraying atomized fluid by mixing charged water and compressed air,
A drip-proof method for a fluid spray system, comprising: covering a drip-proof object with an insulating member that electrically insulates so that charged spray particles sprayed from the two-fluid nozzle are not attracted.
The drip-proof method of the fluid spray system according to claim 6, wherein the drip-proof object is a part of a configuration of the fluid spray system.
The drip-proof method of the fluid spray system according to claim 6, wherein the drip-proof object is in a space to be sprayed by the fluid spray system.