JP5690854B2 - Mist release pin and electrostatic atomizer - Google Patents

Description

  The present invention relates to a mist discharge pin and an electrostatic atomizer using the mist discharge pin.

Conventionally, mist release pins have been made of a ceramic porous body. In addition, the conventional electrostatic atomizer includes a mist discharge pin made of a ceramic porous body and a water storage part in which an aqueous solution is stored, and applies a high voltage to the mist discharge pin that has absorbed the aqueous solution by capillary action. By doing so, the mist was discharged from the front-end | tip part of the mist discharge | release pin (for example, refer patent document 1).
And in order to improve electroconductivity, electroconductive powder, such as carbon powder, was apply | coated or impregnated to the mist discharge | release pin which consists of ceramic porous bodies.

JP 2009-255091 A

However, since the conductive powder has a large contact area with air, the oxidation reaction often occurs, and the oxide clogs a porous body such as ceramics, and there is a problem that generation of mist is suppressed.
In other words, conventionally, maintenance for removing oxides has to be performed in a short period of time, and a higher voltage than necessary has been applied in order to generate mist reliably and in large quantities.

  Therefore, the present invention does not require maintenance such as clogging cleaning (oxide removal) over a long period of time, and generates a large amount of mist reliably and stably without applying a high voltage (6 kV or higher) as in the past. An object is to provide a possible mist discharge pin and electrostatic atomizer.

In order to achieve the above object, the mist release pin of the present invention is a mist release pin that releases mist to the outside, and bundles together a fiber assembly having a large number of carbon fibers in a longitudinal direction. The cross-sectional area ratio of the microchannel with respect to the cross-sectional area of the fiber assembly bundled by the focusing means is 30% or more and 70% or less .
In addition, the focusing means includes a ring-shaped or cylindrical holding member that is attached to the multiple carbon fibers in an outer fitting shape.
Or the said focusing means consists of a binder layer which couple | bonds the outer peripheral area | region of the said many carbon fiber.
Or the said focusing means consists of a binder which couple | bonds the said adjacent carbon fiber.

Moreover, it has the small protrusion exposure part which protruded the front-end | tip of the said many carbon fiber from the said holding member.
The holding member is made of a heat shrink member.

Further, the electrostatic atomization device of the present invention includes a mist discharge pin that discharges mist to the outside, a water storage part that stores an aqueous solution for causing the mist discharge pin to absorb water, and water that absorbs the aqueous solution in the water storage part. In the electrostatic atomizer having a water retaining portion that is held and connected to the mist discharge pin, and an application electrode that applies a voltage to the mist discharge pin, the mist discharge pin includes a plurality of carbon fibers. the fiber aggregate having, formed on the rod-shaped body having a longitudinal microchannels are bundled by the focusing means, further, the fine channel for cross-sectional area of the fiber aggregate bundled by the focusing means The cross-sectional area ratio is 30% or more and 70% or less .

  According to the present invention, the conductivity is improved and the oxidation reaction can be reduced as compared with the case where conductive powder is applied or impregnated. Therefore, there is little generation of clogging due to oxides, maintenance is unnecessary for a long time (long term), and a large amount of mist is generated reliably and stably without applying a high voltage as in the past. Can do. The application and impregnation step of the conductive powder can be omitted, and it can be easily manufactured.

It is the schematic which shows one Embodiment of the electrostatic atomizer which concerns on this invention. It is a longitudinal section showing a 1st embodiment of a mist discharge pin concerning the present invention. It is a principal part expanded horizontal sectional view of FIG. It is a longitudinal cross-sectional view which shows 2nd Embodiment of a mist discharge | release pin. It is a principal part expanded horizontal sectional view which shows 3rd Embodiment of a mist discharge | release pin. It is a principal part expanded longitudinal cross-sectional view which shows 4th Embodiment of a mist discharge | release pin. It is a principal part expanded longitudinal sectional view which shows the other example of a small protrusion exposure part. It is a principal part expanded horizontal sectional view which shows 5th Embodiment of a mist discharge | release pin. It is a principal part expanded horizontal sectional view which shows 6th Embodiment of a mist discharge | release pin. It is a graph which shows the mist discharge | release amount at the time of applying 6 kV to an Example. It is a graph which shows the mist discharge | release amount at the time of applying 4 kV to an Example. It is a graph which shows the mist discharge | release amount at the time of applying 3 kV to an Example. It is a graph which shows the mist discharge | release amount at the time of applying 6 kV to a comparative example.

Hereinafter, the present invention will be described in detail based on illustrated embodiments.
As shown in FIG. 1, the mist discharge pin 1 according to the present invention is one in which a high voltage is applied from the application electrode 23 and discharges the aqueous solution W held inside the water reservoir 21 as a mist from the tip.

  As shown in FIG. 2 and FIG. 3, the mist releasing pin 1 is a rod-shaped bundle of fiber assemblies 10 having a large number (about 10,000 to about 100,000) of carbon fibers 11 bundled by a focusing means 5. It is a body. For example, it is bundled into a cylindrical shape having a diameter of 2 mm to 4 mm and a total length L of 10 mm to 40 mm. The carbon fiber 11 is PAN-based or pitch-based (mesophase pitch-based or isotropic pitch-based).

A large number of carbon fibers 11 (fiber assembly 10) bundled by the converging means 5 have a plurality (small number) of microchannels 18 in the longitudinal direction N between the plurality of carbon fibers 11, 11. Have along.
The fiber assembly 10 is obtained by cutting a long fiber bundle longer than a predetermined dimension L (full length dimension L of the mist discharge pin 1 to be formed) into a predetermined dimension L (a fixed fiber bundle). Compared with the porous body and the short fiber of 50% or less of the predetermined dimension L formed into a rod shape by molding, the conductivity (conductivity) is excellent. Moreover, since the micro flow path (gap) 18 along the fiber is continuously formed from one end to the other end, the suction (water absorption) and water retention by capillary action are excellent.

  Further, the microchannel ratio of a large number of carbon fibers 11 bundled by the focusing means 5 (the cross-sectional area ratio of the microchannel 18 with respect to the cross-sectional area of the fiber assembly 10) is preferably 30% or more and 70% or less. Are bundled to be 40% to 65%. If it is less than the lower limit, the amount (water absorption) that the microchannel 18 sucks up the aqueous solution W by capillary action (water absorption) and the water retention amount are reduced, and a sufficient mist discharge amount cannot be obtained. Further, when the upper limit is exceeded, production becomes difficult.

As shown in FIG. 2, the focusing means 5 comprises a cylindrical holding member 7 that is attached to a large number of carbon fibers 11 (fiber assembly 10) in an outer fitting manner.
The holding member 7 is a cylindrical (pipe-like or tube-like) heat-shrinkable member 71 of thermoplastic resin (polyolefin, PET, fluorine-based resin, vinyl chloride, or other resin). The longitudinal dimension of the heat shrinkable member 71 is 30% or more of the total length L of the fiber assembly 10 after heat shrinkage, and one or a plurality of these are used, but the total length L is 80% or more. 100% or less is desirable. The thickness (thickness) of the holding member 7 is preferably 0.1 mm or more and 2 mm or less.
By using the heat-shrinkable member 71 such as a heat-shrinkable tube as the holding member 7, a large number of carbon fibers 11 can be bundled easily and quickly simply by heat-shrinking with a heating device such as a dryer.
The heat-shrinkable member 71 is preferably one obtained by mixing a thermoplastic resin with conductive powder such as carbon powder to impart conductivity. Further, the distal end surface of the fiber assembly 10 and the distal end surface of the holding member 7 are flush with each other (so that the carbon fibers 11 do not protrude).

  Next, in the second embodiment shown in FIG. 4, the holding member 7 is a ring-shaped heat shrink member 71, and after heat shrink, 1% or more and less than 30% of the total length L of the fiber assembly 10 ( A plurality of them are preferably provided so as to be 2% or more and less than 10%. Further, the distal end surface of the fiber assembly 10 and the distal end surface of the holding member 7 at the distal end are flush with each other (so that the carbon fiber 11 does not protrude). Other configurations are the same as those of the above-described embodiment.

  Next, in the third embodiment, the holding member 7 is a ring-shaped or cylindrical member made of a material such as resin, metal, or ceramics. As shown in FIG. The fiber assembly 10 is disposed in an inner shape, and a binder 79 made of hot melt resin is filled between the holding member 7 and the fiber assembly 10, and the holding member 7 and the outer peripheral area K of the fiber assembly 10 are Is a mist releasing pin 1 to which are fixed (bonded).

That is, the converging means 5 secures the holding member 7 attached to the fiber assembly 10 in an outer fitting manner, the inner surface 7a of the holding member 7 and the outer peripheral region K, and a plurality of carbon fibers 11 in the outer peripheral region K. And a binder layer 75 to be bonded.
The binder layer 75 includes a fixing portion (layer) 75a for fixing the inner surface 7a of the holding member 7 and the outer peripheral region K, and a permeating portion (layer) 75b for binding the plurality of carbon fibers 11 in the outer peripheral region K. ing.
When the holding member 7 and the binder layer 75 are provided in the entire longitudinal direction N of the fiber assembly 10, sufficient rigidity can be obtained. When provided at a plurality of positions in the longitudinal direction N, consumption of the holding member 7 and the binder 79 can be reduced. Other configurations are the same as those of the above-described embodiment.
Although not shown in the drawings, the holding member 7 may be provided with a belt-like body. The belt-like body is preferably composed of, for example, a large number of fibers such as an inorganic material and a polymer material, and is excellent in water absorption. Further, in the longitudinal wrapping, the longitudinal direction N of the fiber assembly 10 is aligned with the longitudinal direction of the strip, the strip is wound around the fiber assembly 10 in a C-shaped cross section, and the binder layer 75 is interposed therebetween. Then, the fiber assembly 10 is attached to the fiber assembly 10 in a ring shape or a cylindrical shape. That is, the holding member 7 is formed with the wound belt-like body. Further, the belt-like body may be wound around the fiber assembly 10 in a spiral shape.

Next, in the fourth embodiment shown in FIGS. 6 and 7, a small protruding exposed portion 1 d in which the tips of a large number of carbon fibers 11 are protruded from the holding member 7 is provided.
In FIG. 6, the small protrusion exposed portion 1d is formed in a fan shape when viewed from the side. In FIG. 7, the small protrusion exposed portion 1d is formed in a round mountain shape when viewed from the side. Although not shown in the drawings, the side projection shape (vertical cross-sectional shape) of the small protrusion exposed portion 1d may be provided in a rectangular shape, a triangular shape, a single-edged shape (inclined shape), or the like. It can be said that the small protrusion exposed portion 1d is a free state in which the tips of the multiple carbon fibers 11 are not constrained. Other configurations are the same as those of the above-described embodiment.

  As a manufacturing method using the heat shrink member 71, a long fiber bundle longer than a predetermined dimension L is covered with the heat shrink member 71 and thermally contracted, and then cut into a predetermined dimension L to obtain a rod-like body. Or a manufacturing method in which a fiber assembly 10 having a predetermined dimension L is inserted into the heat shrinkable member 71 and the heat shrinkable member 71 is heat shrunk to form a rod-like body.

Next, in the fifth embodiment shown in FIG. 8, the focusing means 5 is the mist release pin 1 composed of the binder layer 75 that binds the outer peripheral region K of the fiber assembly 10.
That is, the focusing means 5 is composed of only the binder layer 75 without the holding member 7.
The binder layer 75 has a covering portion (layer) 75d that surrounds the outer peripheral region K of the fiber assembly 10 from the radial outer side, and a permeating portion (layer) 75b that binds the plurality of carbon fibers 11 in the outer peripheral region K. doing.

The binder layer 75 is obtained by solidifying a resinous binder 79. For example, conductive resin (synthetic adhesive) such as acrylic resin, urethane resin, SBR (styrene-butadiene rubber), and epoxy resin. Alternatively, it is a resin or the like in which conductivity is imparted or improved by mixing carbon powder or metal powder.
In addition, the binder layer 75 is formed in the entire longitudinal direction N (for example, like the holding member 7 in FIG. 2), in a part of the longitudinal direction N, or at a plurality of positions in the longitudinal direction N (for example, FIG. 3), and the like.
When the holding member 7 and the binder layer 75 are provided in the entire longitudinal direction N of the fiber assembly 10, sufficient rigidity can be obtained. When it is provided at a plurality of positions in the longitudinal direction N, the consumption of the binder 79 can be reduced. Other configurations are the same as those of the above-described embodiment.

  Next, in the sixth embodiment shown in FIG. 9, the focusing means 5 is composed of a binder 79 that bonds adjacent (contacting) carbon fibers 11, 11 out of a large number of carbon fibers 11. This is the mist discharge pin 1 in which the holding member 7 is omitted. By bundling (bonding) in this way, a large number of microchannels 18 can be obtained, water can be sufficiently absorbed by capillary action, and sufficient water retention can be obtained. For example, the binder 79 can be made conductive by mixing conductive resin (synthetic adhesive) such as acrylic resin, urethane resin, SBR (styrene-butadiene rubber), epoxy resin, or carbon powder or metal powder. Or an improved resin or the like. Other configurations are the same as those of the above-described embodiment.

The mist releasing pin 1 preferably contains a deliquescent component (the fiber assembly 10 is preferably impregnated with the deliquescent component).
As deliquescent components to be included, polyphosphate, potassium phosphate, citric acid (C ₆ H ₈ O ₇ ), sodium hydroxide (NaOH), potassium carbonate (K ₂ CO ₃ ), magnesium chloride (MgCl ₂ ), Examples thereof include calcium chloride (CaCl ₂ ), phosphoric acid (H ₃ PO ₄ ), and phosphate.
As the polyphosphate, potassium polyphosphate, calcium polyphosphate, or magnesium polyphosphate is preferably selected.
As the phosphate, potassium phosphate is preferably selected.
Since these components have deliquescence, they play a role of absorbing moisture in the atmosphere (in the air) and holding it in the mist discharge pin 1. These deliquescent components are contained in one or a combination of two or more.

  As a method for containing the deliquescent component, an aqueous solution of the deliquescent component is prepared, and the fiber assembly 10 bundled by the bundling means 5 or the temporarily held fiber assembly 10 in a negative pressure atmosphere is 1 to Immerse for about 12 hours. Then, it vacuum-drys at 50-60 degreeC for 1 to 12 hours, and dries a water | moisture content. After drying, the mist release pin 1 impregnated with about 0.5 to 8% of the deliquescent component with respect to the total mass of the fiber assembly 10 is obtained. It is preferable to select a deliquescent component used as a food additive. Moreover, it is preferable to select a stable component without strong corrosiveness. It is also preferable to select a component having a higher molecular weight (greater than water).

The mist release pin 1 may be a bundle of carbon fibers 11 and metal fibers. That is, a fiber assembly 10 having carbon fibers 11 and metal fibers may be used.
The flexibility of the carbon fiber 11 and the conductivity (conductivity) and durability of the metal fiber can be obtained with a good balance.
Further, the fiber assembly 10 is arranged with the metal fibers close to the axial center to form a metal fiber core portion, and the carbon fibers 11 are disposed so as to surround the metal fiber core portion, thereby forming the carbon fiber surrounding portion. A formed two-layer structure may be used.

The mist release pin 1 may be a bundle of carbon fibers 11 and organic fibers. That is, a fiber assembly 10 having carbon fibers 11 and organic fibers may be used.
Examples of organic fibers include nylon-based fibers such as nylon 6 (registered trademark), nylon 66 (registered trademark), and aromatic polyamide, and polyesters such as polyethylene terephthalate, polybutylene terephthalate, polylactic acid, polyglycolic acid, and polycarbonate. Various fibers, acrylic fibers such as polyacrylonitrile, polyolefin fibers such as polyethylene and polypropylene, polymethacrylate fibers such as polymethyl methacrylate, polyvinyl alcohol fibers, polyvinylidene chloride Various fibers, polyvinyl chloride fibers, polyurethane fibers, phenol fibers, fluorine fibers made of polyvinylidene fluoride, polytetrafluoroethylene, and the like.
Moreover, the shape is free such as solid fibers (non-hollow fibers) and straw-like fibers (hollow fibers). The outer diameter of the hollow fiber is 0.2 mm or less, preferably 0.1 mm or less, and the inner diameter is preferably 10 μm or more and 50 μm or less.

Next, as shown in FIG. 1, the electrostatic atomizer according to the present invention includes the above-described mist discharge pin 1, a water storage unit 21 in which an aqueous solution W for causing the mist discharge pin 1 to absorb water, A water retention part 22 that absorbs and holds the aqueous solution W in the part 21 and is connected to (contacts with) the base end face of the mist discharge pin 1, and an application electrode 23 that applies a voltage to the mist discharge pin 1. Yes.
By applying a DC voltage to the mist discharge pin 1, the aqueous solution W held by the mist discharge pin 1 is discharged to the outside as a mist. Further, it does not have (omitted) the counter (electric) electrode arranged in a face-to-face manner with the mist discharge pin 1.

The water retention part 22 has water absorption (force) and water retention (force). It is desirable to form a porous body or a molded body formed by combining the carbon fiber 11 and the carbon material.
Note that the structure is not limited to a porous body or a molded body, and may be a honeycomb structure, a corrugated structure, a pipe shape, a sheet shape, a pleated shape, or the like as long as the structure has water absorption and water retention.

The application electrode 23 is a direct-current voltage (DC) power supply electrode, and the negative electrode is connected to the water retention unit 22 through a conductive wire to be negatively charged and a DC negative voltage of 3 kV or more and less than 6 kV is applied to the mist discharge pin. Is.
Since the current from the application electrode 23 flows in search of the place where it is most likely to be discharged, the current is applied to the mist discharge pin 1 that protrudes from the water retention part 22 and has higher conductivity than the water retention part 22. When a DC voltage of 3 kV or more and less than 6 kV is applied to the mist discharge pin 1, the aqueous solution W held by the discharge pin 1 is discharged as a mist from its tip to the outside due to a spontaneous discharge phenomenon.

The water storage unit 21 stores the aqueous solution W having a functional component, and supplies the aqueous solution W to the water holding unit 22 by a supply unit 24 using a capillary phenomenon such as a straw-like member.
Functional components include vitamin C (L-ascorbic acid), vitamin C ester (magnesium L-ascorbate phosphate, sodium L-ascorbate phosphate, magnesium ascorbate phosphate, etc.), vitamin A, vitamin B, vitamin D , Vitamin Dα-lipoic acid, amino acids, tea (tea flower) extract (catechin, tannin, saponin, theanine, caffeine, etc.), hyaluronic acid, collagen, aroma essential oil (lavender, rosemary, lemongrass, tea tree, sage, clove) , Orange, grapefruit, cinnamon, jasmine, etc.), coffee beans, tea (tea flowers), wasabi, hinokitiol, chitin, chitosan, propolis and the like. Moreover, an inorganic soluble component is mentioned. Examples of the inorganic substance (inorganic soluble component) include silver and sodium chloride. Moreover, platinum nanoparticle, palladium nanoparticle, etc. are mentioned.

That is, the aqueous solution W contains one or more (non-volatile) functional components selected from the above organic soluble components and the above inorganic soluble components. “Functionality” means the property that can comfortably improve the living environment, the property that can contribute to the improvement of health and psychological state, deodorization (deodorization, decomposition, etc.), antimicrobial (antibacterial, bactericidal, Bacteriostatic, antifungal, antiviral, etc.), relaxation (aromatherapy), moisturizing, antioxidant, harmful small organism repellent, antistatic, dustproof, etc. It means having properties.
In the present invention, the aqueous solution W held by the mist releasing pin 1 includes water and moisture in the air absorbed by the deliquescent component.

  Although not shown in the drawings, the electrostatic atomizer when the mist discharge pin 1 contains a deliquescent component is self-supplied (self-retaining water) from the air, so that the mist discharge pin 1 Supply of the aqueous solution W to the water becomes unnecessary. Therefore, the water storage part 21, the water holding part 22, and the supply means 24 are omitted, and the conducting wire from the application electrode 23 is connected to the mist discharge pin 1 without passing through the water holding part 22. Such an apparatus can contribute to reduction in size and weight while facilitating the manufacture of the electrostatic atomizer. An economical device can be obtained that can retain water without using electricity or tap water. That is, an expensive Peltier element that requires electrical wiring is not required, and work (maintenance) for supplying tap water or the like to the water storage unit 21 is not required, so that the operating cost can be reduced and the usability is improved. When the fiber assembly 10 contains a deliquescent component, it is desirable that the entire longitudinal direction of the fiber assembly 10 is not surrounded by the holding member 7 or the binder layer 75.

Next, the mist release pin of the present invention will be described using measurement results of Examples and Comparative Examples.
As shown in FIG. 8, the outer peripheral region K of a large number of carbon fibers 11 is bundled with a binder layer 75 as an example, and the outer peripheral region of a large number of polyester fibers is bundled with a binder layer. The amount of mist released was measured by applying a negative voltage of 6 kV as a comparative example to which a conductive powder (carbon powder) was applied. The total length L, the diameter, and the outer shape are the same. FIG. 10 shows the measurement results of the example, and FIG. 13 shows the measurement results of the comparative example.
Note that the measurement was performed with a differential mobility analyzer (Differential Mobility Analyzer).

As is apparent from FIGS. 10 and 13, in the example, the amount of mist released was about 100 times that of the comparative example. It is considered that this is because the example is superior in conductivity to the comparative example (small electric resistance value), and natural discharge is likely to occur, and the amount of mist released is increased.
Also, the particle size of the released mist was stable with less variation compared to the comparative example. This is presumably because the embodiment is less clogged due to oxidation reaction or the like, and mist is released stably. That is, since the carbon fiber 11 has a smaller air contact area than the carbon powder and is less likely to cause an oxidation reaction, it is considered that the example was less clogged with oxide than the comparative example.

FIG. 11 shows the measurement results when a negative voltage of 4 kV is applied, and FIG. 12 shows the measurement results when a negative voltage of 3 kV is applied.
Although the voltage applied to the example was smaller (absolute value) than that of the comparative example, the amount of mist emission was clearly higher in the example. Moreover, there was little variation in the particle diameter of the generated mist.
In other words, it has been clarified that in the example, a large amount of mist emission can be obtained and the mist emission can be stabilized even at a voltage lower than that of the comparative example (voltage having a small absolute value).
Although not shown, the mist release pin 1 corresponding to the embodiment shown in FIGS. 2 to 7 and FIG. 9 is also superior in the mist release amount and release stability to the comparative example, as in the above-described example. The measurement result is obtained.

  The design of the present invention can be changed, and the overall shape of the mist discharge pin 1 is not limited to the illustrated cylindrical shape, but may be an elliptical column shape, a conical shape, or a prism shape. Moreover, it is preferable that the front-end | tip of the mist discharge | release pin 1 is a curved surface shape rounded rather than planar shape (a front-end | tip edge is circular arc shape rather than one character shape by side view). For example, by rounding, such as a Maruyama type and a shell type, the balance of mist emission, water retention, and conductivity is superior to those with sharp angles. Alternatively, a positive charge may be applied to the mist discharge pin 1 by connecting the positive electrode of the application electrode 23 of the electrostatic atomizer to the water retention unit 22. The supply means 24 of the electrostatic atomizer may drop the aqueous solution W from the water storage unit 21 to the water retention unit 22. Alternatively, the water retaining unit 22 and the water storage unit 21 may be integrated and the supply unit 24 may be omitted. Further, the fiber assembly 10 may be bundled to a diameter of 4 mm or more by the converging means 5. The total length L may be 40 mm or more.

  As described above, the mist discharge pin of the present invention is a mist discharge pin that discharges mist to the outside, and has a plurality of carbon fibers 11 bundled by the focusing means 5 and has a microchannel 18 in the longitudinal direction N. Since the rod-shaped body is used, the conductivity (conductivity) is improved and the oxidation reaction can be reduced as compared with the case where the conductive powder is applied or impregnated. Therefore, there is little occurrence of clogging due to oxides, maintenance is not required for a long time (long term), and it is possible to reliably and without applying a high voltage of 6 kV or more as in the past (with a voltage of less than 6 kV). A large amount of mist can be generated stably. Water absorption by capillarity is reliably performed, and excellent water absorption and water retention can be stably exhibited. Moreover, it is smaller than the conventional one (even if the total length L is short and the diameter is small), and a sufficient mist discharge amount can be obtained.

  Further, since the converging means 5 includes a ring-shaped or cylindrical holding member 7 that is attached to a large number of carbon fibers 11 in an outer fitting manner, the large number of carbon fibers 11 can be bundled easily and quickly. In addition, in the manufacturing process, handling (handling) becomes easy and manufacturing can be performed easily.

  Further, since the converging means 5 is composed of the binder layer 75 that binds the outer peripheral area K of the multiple carbon fibers 11, the holding member 7 is not required, and it can easily cope with various shapes and can be reduced in weight.

  In addition, since the converging means 5 is made of the binder 79 that binds the adjacent carbon fibers 11 and 11, sufficient water absorption and water retention can be reliably obtained while the holding member 7 is unnecessary.

  In addition, since the front ends of a large number of carbon fibers 11 have the small protruding exposed portions 1d that protrude from the holding member 7, the amount of mist emitted can be increased. The tip can be easily formed into various shapes that are optimal for discharging mist, such as a rounded curved surface (the tip edge is arcuate in a side view).

  In addition, since the holding member 7 includes the heat shrinkable member 71, a large number of carbon fibers 11 can be easily and quickly bundled and manufactured. It can be made into a rod-like body with a heating device such as a dryer or a die with a heater, and the manufacturing equipment can be simplified. It is suitable for mass production, and manufacturing costs can be kept low.

  In addition, a mist discharge pin 1 that discharges mist to the outside, a water storage part 21 that stores an aqueous solution W for causing the mist discharge pin 1 to absorb water, and absorbs and holds the aqueous solution W in the water storage part 21 while discharging mist. In an electrostatic atomizer having a water retaining portion 22 connected to a pin 1 and an application electrode 23 for applying a voltage to the mist discharge pin 1, the mist discharge pin 1 includes a plurality of carbon fibers 11. Since it is formed into a rod-like body bundled by the converging means 5 and having a micro flow path 18 in the longitudinal direction N, the conductivity is improved and the oxidation reaction is performed as compared with the case where conductive powder is applied or impregnated. Less. Therefore, clogging due to oxide is less likely to occur, and maintenance is unnecessary for a long time (long term). Mist can be generated reliably and stably without applying a high voltage of 6 kV or higher as in the prior art. An electrostatic atomizer with low operating cost can be obtained.

DESCRIPTION OF SYMBOLS 1 Mist discharge | emission pin 1d Small protrusion exposure part 5 Focusing means 7 Holding member
10 fiber assembly
11 Carbon fiber
18 Microchannel
21 Water reservoir
22 Water retention department
23 Applied electrode
71 Heat shrinkable material
75 Binder layer
79 Binder K Peripheral area N Longitudinal direction W Aqueous solution

Claims (7)

A mist discharge pin for discharging mist to the outside,
A fiber assembly (10) having a large number of carbon fibers (11) is bundled by a focusing means (5) to form a rod-like body having a microchannel (18) in the longitudinal direction (N) ,
Mist characterized in that the cross-sectional area ratio of the microchannel (18) with respect to the cross-sectional area of the fiber assembly (10) bundled by the focusing means (5) is 30% to 70%. Release pin.   The mist discharge pin according to claim 1, wherein the focusing means (5) includes a ring-shaped or cylindrical holding member (7) attached to the multiple carbon fibers (11) in an outer fitting manner.   The mist discharge pin according to claim 1, wherein the focusing means (5) comprises a binder layer (75) for binding the outer peripheral area (K) of the multiple carbon fibers (11).   The mist release pin according to claim 1, wherein the focusing means (5) comprises a binder (79) for binding the adjacent carbon fibers (11) (11).   The mist discharge pin according to claim 2, further comprising a small protrusion exposed portion (1d) in which the ends of the multiple carbon fibers (11) protrude from the holding member (7).   The mist discharge pin according to claim 2, wherein the holding member (7) is a heat shrinkable member (71). A mist discharge pin (1) for discharging mist to the outside, a water storage part (21) in which an aqueous solution (W) for causing the mist discharge pin (1) to absorb water is stored, and the above-mentioned in the water storage part (21) A water retaining part (22) for absorbing and holding the aqueous solution (W) and connected to the mist discharge pin (1), and an application electrode (23) for applying a voltage to the mist discharge pin (1). In the electrostatic atomizer
The mist release pin (1) has a fine channel (18) in the longitudinal direction (N) by bundling a fiber assembly (10) having a large number of carbon fibers (11) by a focusing means (5). The cross-sectional area ratio of the microchannel (18) with respect to the cross-sectional area of the fiber assembly (10) formed in a rod-like body and bundled by the focusing means (5) is 30% or more and 70% or less. The electrostatic atomizer characterized by being.

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