Electrostatic spray head

Abstract

To suppress and prevent fluctuation in an induced electric field and dielectric breakdown due to liquid remaining in an electrode holding structure.SOLUTION: A charged dispersion head (10) includes: a body part 12 with a nozzle part 22 for discharging liquid particles to spray charged liquid particles; an induction electrode part 24 for charging the discharged liquid particles from the nozzle part 22; and an electrode holding structure 25 for holding the induction electrode part 24 in a space on a discharge side of the nozzle part 22. The electrode holding structure 25 has a predetermined number of arm parts 26 each having an overhang part which is formed to overhang inward and has an electrode holding part 2630 formed at an end to be abutted on the induction electrode part 24 when holding the induction electrode part 24, and is provided with drain holes 2650 as a liquid draining structure for draining liquid adhering to predetermined positions of the overhang parts of the arm part 26.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to an electrostatic spray head that charges and sprays liquid particles. [Background technology]

[0002] Conventionally, charged spray heads that charge and spray fine particles of liquid such as water can spray charged liquid particles with an average particle diameter of 10 to 300 μm, and are installed in fire extinguishing equipment in target areas such as buildings. The sprayed charged liquid particles electrically adsorb smoke generated by a fire, thereby eliminating the smoke, and the charged liquid particles electrically adhere to the target object, thereby increasing fire extinguishing efficiency. Furthermore, at building demolition sites, for example, the charged liquid particles can electrically adsorb dust suspended in the air, thereby removing the dust from the air.

[0003] Figure 13 shows a cross-sectional view of the structure of a conventional electrically charged spray head. As shown in Figure 13, electrically charged spray head 100 comprises a main body 120, a water-side electrode 140, an electrode connector 160, a liquid conduit 180, a main body cover 200, a nozzle 220, an induction electrode 240, and an electrode holding structure having an arm 260.

[0004] 13, the X, Y, and Z directions are perpendicular to each other, and specifically, the Y axis direction is the flow direction of water passing through the charged spray head 100 and the up-down direction, the X direction is the left-right direction, and the Z direction is the front-to-back direction. Also, the +X side in the X direction is the right side and the -X side is the left side, the +Y side in the Y direction is the upper side and the -Y side is the lower side, and the +Z side in the Z direction is the front side and the -Z side is the rear side.

[0005] Furthermore, since the Y-axis direction, which is the up-down direction, is the direction in which water flows through the head, the upper +Y side is sometimes referred to as the inflow side, and the lower -Y side is sometimes referred to as the outflow side. This also applies to the X, Y, and Z directions in Figures 1 to 12 and 14, which illustrate embodiments of the present invention. Note that the X, Y, and Z directions are relative directions that change depending on the installation state of the electrically charged spraying head 100 in the spray target area.

[0006] The main body 120, liquid conduit 180, main body cover 200, nozzle 220, and electrode holding structure are insulators made of insulating materials such as polyvinyl chloride resin. The water electrode 140 and electrode connector 160 are conductors made of conductive materials such as metal.

[0007] An electrode mounting hole 121 is formed inside main body 120 and extends in the direction of head axis 350 (up and down), and water side electrode section 140 is fitted into electrode mounting hole 121 from the outlet side. Liquid conduit section 180 is fitted into main body 120 from the inlet side via terminal chamber 124 formed on the inlet side of main body 120, and electrode connecting section 160 is passed through liquid conduit section 180 and screwed into water side electrode section 140, thereby attaching and fixing water side electrode section 140 to electrode mounting hole 121 and connecting and fixing liquid conduit section 180 to water side electrode section 140.

[0008] The electrode connecting portion 160 is provided with a plurality of screw holes 164, and allows the terminal of an earth cable inserted via a waterproof connector to be connected to an electrode connector mounting hole 127 formed in the lateral direction (a direction perpendicular to the up-down direction, or to the right in FIG. 13) of the terminal chamber 124. The upper part of the liquid conduit portion 180 is taken out to the outside through the main body cover portion 200, and water is supplied from an external water supply pump or the like.

[0009] Nozzle portion 220 is provided by nozzle holding portion 230 at the end of the outlet side of water-side electrode portion 140, which is disposed along head axis 350 direction (vertical direction) of main body portion 102, and water particles with an average particle diameter of 10 to 300 μm are emitted from nozzle portion 220. Furthermore, in the open space on the outlet side of nozzle portion 220, ring portion 243 of induction electrode portion 240 is held by three arms 260 of the electrode holding structure, and the water particles emitted from nozzle portion 220 are charged. Ring portion 243 of induction electrode portion 240 is formed by insulatingly coating a conductive electrode core material. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-106405 [Patent Document 2] Japanese Patent Application Publication No. 2018-183712 Summary of the Invention [Problem to be solved by the invention]

[0011] Incidentally, the amount of water sprayed from the nozzle portion 220 provided in a conventional electrostatic spray head varies depending on the area to be sprayed, such as a building equipped with fire extinguishing equipment or a demolition site, and when the amount of water sprayed from the nozzle portion 220 is large, for example, 1.0 liter per minute, the diameter of the ring portion 243 of the induction electrode portion 240 is made large to correspond to the high-water-volume nozzle attached as the nozzle portion 220, and the ring portion 243 of the induction electrode portion 240 is held by an electrode holding portion 263 formed at the tip of the extension portion 266, which extends only a small amount toward the inside of the arm portion 260.

[0012] In contrast, when the amount of water discharged from nozzle portion 220 is small, for example, 0.1 per minute, as shown in FIG. 14 , the diameter of ring portion 243 of induction electrode portion 240 is made small to correspond to the small-flow nozzle attached as nozzle portion 220, and ring portion 243 of induction electrode portion 240 is held by electrode holding portion 263 formed at the tip of protruding portion 266, which protrudes greatly toward the inside of arm portion 260.

[0013] However, in an electrode holding structure in which the ring portion 243 is held by the arm portion 260 having the protruding portion 266 formed with a large protrusion amount as shown in Figure 14, there is a problem in that some of the water particles released from the nozzle portion 220 adhere to and remain on the upper surface 250 of the protruding portion 266 of the arm portion 260, and the retained water affects the induced electric field generated in the ring portion 243 of the induction electrode portion 240, causing fluctuations in the induced electric field and fluctuations in the charging performance of the water particles by the induction electrode portion 240.

[0014] Furthermore, there is also the problem that water remaining on the upper surface 250 of the protruding portion 266 of the arm portion 260 functions as one of the electrodes, reducing the insulation distance with the induction electrode portion 240 and increasing the possibility of dielectric breakdown.

[0015] Furthermore, even when the large-diameter ring portion 243 shown in FIG. 13 is held by the arm portion 260, the arm portion 260 has a protruding portion 266 that protrudes inward to some extent, and although the amount of water particles retained in the protruding portion 266 is small, these problems do occur.

[0016] An object of the present invention is to provide an electrically charged spray head that can suppress and prevent fluctuations in the induced electric field and dielectric breakdown caused by liquid remaining in the electrode holding structure. [Means for solving the problem]

[0017] (Charged spray head 1) The present invention provides an electrically charged spray head that sprays liquid particles onto a target area, the liquid particles being charged by an induction electrode that is held by an electrode holding structure so as to be positioned in a space on the nozzle side of the nozzle, and the charged liquid particles being discharged from the nozzle, The electrode holding structure is characterized by being provided with a liquid drainage structure for draining liquid adhering to a predetermined portion of the electrode holding structure.

[0018] (Charged spray head 2) The present invention relates to a charging liquid body An electrostatic spray head for spraying particles onto a target area, a main body having a nozzle for emitting liquid particles to spray the charged liquid particles; an induction electrode portion that charges the liquid particles emitted from the nozzle portion; an electrode holding structure that holds the induction electrode portion in a space on the discharge side of the nozzle portion; Equipped with the electrode holding structure has a predetermined number of arms each having an inwardly projecting portion and an electrode holding portion formed at an end thereof that comes into contact with the induction electrode when the induction electrode is held; The device is characterized by being provided with a liquid drainage structure for draining liquid adhering to a predetermined position on the extension of the arm.

[0019] (Liquid drainage structure with drainage holes) The liquid drainage structure is a liquid drainage hole formed at a predetermined position in the protruding portion so as to penetrate in a predetermined direction.

[0020] (Liquid drain hole that penetrates in the direction corresponding to the discharge direction of the nozzle part) The liquid drainage hole is formed so as to penetrate in a predetermined liquid drainage direction corresponding to the direction in which the liquid particles are discharged by the nozzle portion.

[0021] (Drainage holes in the corners of the arms) The arm portion has an L-shape, one end of which is attached to the outlet side of the main body portion, and the other end of which has a protruding electrode holding portion formed thereon; The liquid drain hole is formed penetrating from an inner corner portion of the L-shape of the protruding portion to an outer corner portion of the L-shape.

[0022] (Roof-shaped liquid drainage structure formed on the protruding part) The liquid drainage structure is a predetermined roof shape formed at a predetermined position on the inlet side of the protruding portion. [Effects of the Invention]

[0023] (Effect of electrostatic spray head 1) The present invention is an electrically charged spray head that sprays charged liquid particles onto a target spray area by charging liquid particles released from a nozzle section with an induction electrode section that is held by an electrode holding structure so that it is positioned in the space on the release side of the nozzle section.The ... held in the space on the release side of the nozzle section.The present invention is an electrically charged spray head that sprays charged liquid particles onto a target spray area.The present invention is an electrically charged spray head that sprays charged liquid particles onto a target spray area.The present invention is an electrically charged spray head that sprays charged liquid particles onto a target spray area.

[0024] (Effect of electrostatic spray head 2) The present invention relates to a charging liquid bodyAn electrically charged spray head that sprays particles onto a target area, comprising: a main body having a nozzle that emits liquid particles to spray the charged liquid particles; an induction electrode that charges the liquid particles emitted from the nozzle; and an electrode holding structure that holds the induction electrode in the space on the emission side of the nozzle. The electrode holding structure has a predetermined number of arms that are formed to protrude inward and have protrusions on which electrode holding portions are formed at the ends that abut the induction electrode when holding the induction electrode. A liquid drainage structure is provided to drain liquid that has adhered to predetermined positions on the protrusions of the arms, so that liquid that has adhered to predetermined parts of the electrode holding structure is drained by the liquid drainage structure provided on the protrusions located near the electrode holding portions and does not stagnate in the protrusions. As with the electrically charged spray head 1, this makes it possible to suppress and prevent fluctuations in the induced electric field generated in the induction electrode and the occurrence of insulation breakdown.

[0025] (Effect of drainage hole and drainage structure) Furthermore, since the drainage structure is a drainage hole formed at a predetermined position on the protruding portion in a predetermined direction, for example, penetrating the protruding portion in a predetermined drainage direction corresponding to the direction in which the liquid particles are discharged from the nozzle portion, it is possible to realize a drainage structure with a simple structure. Furthermore, even in existing electrostatic spray heads that do not have a drainage structure, it can be formed by post-processing.

[0026] (Effect of drain holes that penetrate the corners of the arm) In addition, the arm portion is L-shaped, with one end attached to the outflow side of the main body portion and the other end formed with an electrode holding portion of the protruding portion, and the liquid drain hole is formed by penetrating from the inner corner portion of the L-shape of the protruding portion toward the outer corner portion of the L-shape, so that it is possible to form a water drain hole in the protruding portion even if the amount of protrusion of the protruding portion is small.

[0027] (Roof-shaped liquid drainage structure formed on the protruding part) Furthermore, the liquid drainage structure is a predetermined roof shape formed at a predetermined position on the inlet side of the protruding portion, so the simple water drainage structure allows liquid to flow down from the protruding portion and not accumulate in the protruding portion. Furthermore, while there is a concern that the liquid drainage structure will no longer function if the drainage hole becomes clogged, the roof shape eliminates this concern and makes it possible to maintain the reliability of the liquid drainage structure. [Brief explanation of the drawings]

[0028] [Figure 1] FIG. 2 is an explanatory diagram showing the front of the electrostatic spray head. [Figure 2] 3A and 3B are explanatory views showing the top and bottom surfaces of the electrically charged spraying head; [Figure 3] FIG. 2 is an explanatory diagram showing a cross section of the internal structure of the electrostatic spray head. [Figure 4] 10 is an explanatory diagram showing a cross section of the assembled and disassembled state of the electrode holding structure of the electrostatic spray head. FIG. [Figure 5] FIG. [Figure 6] FIG. 10 is an explanatory view showing the fixed plate portion taken out. [Figure 7] FIG. 2 is an explanatory diagram showing the arm portion. [Figure 8] FIG. 10 is an explanatory diagram showing an electrically charged spray head equipped with a low-water-volume nozzle. [Figure 9] FIG. 10 is an explanatory diagram showing an electrically charged spray head equipped with a high-water-volume nozzle. [Figure 10] FIG. 10 is an explanatory view showing the arm portion of FIG. 9. [Figure 11] 10 is an explanatory diagram showing a drainage structure in which the protruding portion of the arm portion has a triangular roof shape. FIG. [Figure 12] 10 is an explanatory diagram showing a drainage structure in which the protruding portion of the arm portion is shaped like a dome roof. FIG. [Figure 13] FIG. 1 is a cross-sectional view showing the internal structure of a conventional electrostatic spray head. [Figure 14] FIG. 10 is a cross-sectional view showing the internal structure of a conventional electrostatic spray head in which the ring portion of the induction electrode portion has a small diameter. DETAILED DESCRIPTION OF THE INVENTION

[0029] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an electrostatic spray head according to the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the following embodiment.

[0030] [Basic concept of the embodiment] First, the basic concept of the embodiment will be described. The embodiment generally relates to a charged spray head that sprays charged liquid particles onto a spray target area.

[0031] Here, an "electrically charged spray head" is a device that sprays charged liquid particles onto a target spray area, and the configuration of the electrically charged spray head related to the present invention comprises at least a main body having a nozzle portion that emits liquid particles to spray the charged liquid particles, an induction electrode portion that charges the liquid particles emitted from the nozzle portion, and an electrode holding structure that holds the induction electrode portion in the space on the emission side of the nozzle portion.

[0032] Furthermore, "charged liquid particles" are liquid particles that are charged and sprayed from a spray head, and are charged using an induction charging method in which, for example, a high voltage is applied from a high-voltage power supply device as a power source between the induction electrode of the spray head and the water-side electrode of the main body, which serves as the other electrode, and the potential of the induction electrode relative to the water-side electrode is adjusted to generate a high electric field in the induction electrode, causing the particles to pass through the high electric field. The sprayed liquid may be any liquid that has smoke-suppressing, fire-extinguishing, dust-removing, or other effects, and includes, for example, water or an aqueous solution supplied under pressure by an external water supply pump or the like.

[0033] Here, as a feature of the charged spray head of the present invention, in order to suppress and prevent fluctuations in the induced electric field generated in the induction electrode section and the occurrence of insulation breakdown, the charged spray head 1 is provided with a liquid drainage structure that drains liquid that has adhered to a predetermined part of the electrode holding structure, and the charged spray head 2 is provided with a liquid drainage structure that is formed by extending inward on a predetermined number of arm sections of the electrode holding structure, and on the end that abuts against the induction electrode section when holding the induction electrode section, the electrode holding section is formed at a predetermined position on the extension section.

[0034] In addition, "adhered liquid" includes liquid and liquid particles that have adhered due to various factors, such as liquid particles released from the nozzle portion, liquid flowing inside the charged spray head that has leaked through gaps in the structure of the charged spray head, and liquid particles floating in the air after spraying.

[0035] The electrode holding structure may have any number of arms capable of holding the induction electrode.

[0036] Furthermore, the "liquid drainage structure" may be any structure that can drain liquid sufficiently to achieve the purpose of suppressing and preventing fluctuations in the induced electric field generated in the induction electrode section and the occurrence of insulation breakdown, and may include, for example, a liquid drainage hole formed in a predetermined position in a predetermined direction through the protrusion section, or a predetermined roof shape formed in a predetermined position on the inlet side of the protrusion section.

[0037] In addition, the "inflow side" refers to the side of the charged spray head from which the supplied liquid flows into the charged spray head, and the "outflow side" refers to the side of the charged spray head from which the charged liquid particles flow out of the charged spray head.

[0038] Furthermore, the structure when the "liquid drainage structure" is changed to a "liquid drainage hole" can also be any structure, and includes, for example, one formed by penetrating in a predetermined liquid drainage direction corresponding to the direction in which liquid particles are released by the nozzle portion, or one formed by penetrating from the inner corner of the L-shape of the protruding portion of an L-shaped arm portion having one end attached to the outflow side of the main body portion and the other end formed with an electrode holding portion of the protruding portion, toward the outer corner of the L-shape.

[0039] Furthermore, when the "liquid drainage structure" is "roof-shaped," the roof shape may be any shape, including, for example, a triangular roof shape or a dome roof shape.

[0040] In the following embodiments, the "charged spray head" is "equipped with a main body, a water-side electrode, a liquid conduit, an electrode connection, a main body cover, a nozzle, an induction electrode, and an electrode holding structure," the "charged liquid particles to be sprayed" are "charged water particles," the "electrode holding structure" is "equipped with three arms, a fixing portion, and a fixing plate," and the "liquid drainage structure" is "formed on the protruding portion of the arm." In the embodiments, the nozzles attached as the nozzle portion are referred to as a "low water flow nozzle," a "medium water flow nozzle," and a "high water flow nozzle" in order of decreasing water discharge amount according to the nozzle discharge amount.

[0041] [Specific details of the embodiment] The specific contents of the embodiment will be described separately as follows. a. Structure of the electrostatic spray head b. Electrode holding structure b1. Fixed part b2.Fixed plate part b3. Arm section b4. Assembly of induction electrode using electrode holding structure b5. Drainage hole on arm c. Electrostatic spray head with low-flow nozzle d. Electrostatic spray head with high-volume nozzle e. Other embodiments of the arm drainage structure f. Modifications of the present invention

[0042] [a. Structure of the electrostatic spray head] First, the structure of the electrically charged spray head will be explained. In this explanation, reference will be made to Fig. 1, which shows the front (front face) of the electrically charged spray head, Fig. 2, which shows the top (top face) and bottom (bottom face) of the electrically charged head, and Fig. 3, which shows a cross section of the internal structure of the electrically charged spray head. Note that Fig. 2(A) shows the top face, Fig. 2(B) shows the bottom face, and Fig. 3 shows the cross section of cutting line aa in Fig. 2(A). Also, Figs. 1 and 3 show the state in which the earth cable is connected.

[0043] As shown in Figures 1 to 3, the embodiment of the electrically charged spray head 10 is composed of a main body portion 12, a water side electrode portion 14, an electrode connecting portion 16, a liquid conduit portion 18, a main body cover portion 20, a nozzle portion 22, an induction electrode portion 24, and an electrode holding structure 25.

[0044] The main body 12, liquid conduit 18, main body cover 20, nozzle 22, and electrode holding structure 25 are insulators made of insulating materials, such as polyvinyl chloride resin, polyphenylene sulfide resin, urethane resin, polytetrafluoroethylene resin, polychlorotrifluoroethylene resin, ceramics (alumina ceramics), glass enamel, etc.

[0045] The water-side electrode portion 14 and the electrode connecting portion 16 are conductors made of conductive materials, which are typically metals, but other conductive materials such as resins, fiber bundles, rubber, etc. may also be used, or a composite made up of a combination of these materials may also be used.

[0046] As shown in the cross section of Figure 3, an electrode mounting hole 1210 is formed inside main body 12 and extends in the direction of head axis 35 (up and down), which is the direction of water flow. Water-side electrode 14 is inserted into electrode mounting hole 1210 from the outlet side (bottom). Liquid conduit 18 is placed in terminal chamber 1240 formed on the inlet side (top) of electrode mounting hole 1210. Electrode connecting portion 16, inserted through liquid conduit 18, is screwed onto the upper end of water-side electrode 14 exposed from electrode mounting hole 1210 to terminal chamber 1240, thereby attaching and fixing water-side electrode 14 to electrode mounting hole 1210 and connecting and fixing the outlet side of liquid conduit 18 to the inlet side of water-side electrode 14.

[0047] A plurality of screw holes 1640 are formed in the electrode connecting portion 16, and an earth cable is inserted via a waterproof cable connector 36 attached to a connector attachment hole 1270 formed in the terminal chamber 1240 of the main body 12 in the horizontal direction (a direction perpendicular to the vertical direction, or rightward in FIG. 3). 34 The terminal 38 is fixed and connected to one of the screw holes 1640 by a screw 40 .

[0048] Liquid conduit section 18 is exposed to the outside through body cover section 20 provided at the opening on the inlet side of terminal chamber 1240, and water pressurized by an external water supply pump or the like is supplied to liquid conduit section 18. The pressure of the water supplied to liquid conduit section 18 is adjusted within the range of 0.1 to 1.0 MPa, for example.

[0049] Nozzle unit 22 is provided on the outlet side (lower end side) of water-side electrode unit 14, which is attached along head axis 35 of main body 12. As shown in Figure 3, medium-flow nozzle 50 is attached and fixed to nozzle unit 22 by nozzle holder 32. Medium-flow nozzle 50 discharges water particles with an average particle diameter of 10 to 300 µm, with a water discharge rate of, for example, 0.5 liters per minute.

[0050] In the open space on the outlet side of the nozzle 22, the induction electrode 24 is held by using three arms 26, as shown in Fig. 3, for example. The induction electrode 24 has, for example, a ring 2430, and is formed by covering a conductive electrode core 2410 with an insulating coating 2420 as shown in the cross section of Fig. 3, and a support 2440 is formed so as to extend upward after being taken out laterally (a direction perpendicular to the up-down direction, or leftward in Fig. 1) from a predetermined position of the ring 2430, and a cable connection 2450 connected to the electrode core 2410 in the ring is exposed at the tip of the support 2440, and a voltage application cable is connected to the cable connection 2450.

[0051] The electrode core material 2410 of the induction electrode portion 24 is a conductor made of a conductive material, and metal is used as the conductive material, but other than metal, conductive resin, fiber bundle, rubber, etc. may also be used, and a composite of these materials may also be used.

[0052] The insulating material for the insulating coating 2420 of the induction electrode unit 24 is, for example, polyvinyl chloride resin, polyphenylene sulfide resin, urethane resin, polytetrafluoroethylene resin, polychlorotrifluoroethylene resin, ceramics (alumina ceramics), glass enamel, or the like. The electrode core material 2410 is insulated by coating (covering) it with, for example, softened polyvinyl chloride (soft vinyl chloride). At this time, the electrode core material 2410 is coated a predetermined number of times to prevent pinholes from remaining in the coating. Furthermore, if the coating thickness is too large, the outermost water particles of the water particle flux emitted from the nozzle unit 22 may strike the inner periphery of the ring portion 2430 of the induction electrode unit 24. This may result in problems such as a decrease in the charging efficiency of the water particles at the induction electrode unit 24, a decrease in the amount of charged water particles dispersed after passing through the induction electrode unit 24, and adverse effects on directionality. Therefore, the coating thickness is adjusted to be not too large. The number of coatings applied is optional, and in this embodiment, the electrode core material 2410 is covered by applying two coatings using soft vinyl chloride.

[0053] 3, the ring portion 2430 of the induction electrode 24 is held at a predetermined position in the open space on the outflow side of the nozzle 22 by three arm portions 26, a fixing portion 28, and a fixing plate portion 30 that constitute the electrode holding structure 25. The details of the electrode holding structure 25 will be described later.

[0054] Earth cable 34 Terminal 38is connected to one of the screw holes 1640 of the electrode connecting portion 16, and a voltage application cable is connected to the cable connecting portion 2450 of the induction electrode portion 24, whereby a predetermined voltage in the range of +0.5 kV to +20 kV or -0.5 kV to -20 kV is applied as a DC voltage, AC voltage, pulse voltage, etc. between the water-side electrode portion 14 and the induction electrode portion 24 as a predetermined adjustment range within the voltage range in which water particles can be charged, and a predetermined external electric field is formed around the ring portion 2430 of the induction electrode portion 24, and the water particles that have been released from the nozzle portion 22 and passed through the ring portion 2430 of the induction electrode portion 24 are charged and dispersed.

[0055] For example, when a DC voltage is applied between water-side electrode unit 14 and induction electrode unit 24, negatively charged water particles are generated if the polarity of induction electrode unit 24 is positive when water-side electrode unit 14 is set to the reference potential (earth potential, 0 V), and positively charged water particles are generated if the polarity of induction electrode unit 24 is negative when water-side electrode unit 14 is set to the reference potential (earth potential, 0 V). Furthermore, if the voltage applied between water-side electrode unit 14 and induction electrode unit 24 is in the range of +0.5 kV to +20 kV or -0.5 kV to -20 kV, spark discharge is prevented, and charged water particles are generated while ensuring safety.

[0056] When the electrically charged spray head 10 is used at a building demolition site or the like to remove dust from the air, the charged water particles sprayed from the electrically charged spray head 10 electrically adsorb and capture dust floating in the air, causing the dust to fall and be removed from the air. Also, when the electrically charged spray head 10 is installed in a fire extinguishing system, the charged water particles sprayed from the electrically charged spray head 10 electrically adsorb and capture smoke particles floating in the air, causing the smoke particles to fall, thereby achieving a smoke-extinguishing effect, and the electrically adsorbing charged water particles to the object to be extinguished can improve fire extinguishing performance.

[0057] [b. Electrode holding structure] Next, the electrode holding structure for holding the induction electrode portion of the electrically charged spray head will be described. In this description, reference will be made to Figure 4, which shows a cross section of the assembled and disassembled state of the induction electrode portion and electrode holding structure of the electrically charged spray head, Figure 5, which shows the fixed portion removed, Figure 6, which shows the fixed plate portion removed, and Figure 7, which shows the arm portion removed. Note that Figure 4, like Figure 3, shows a cross section taken along the cutting line aa in Figure 2(A).

[0058] As shown in the assembled and disassembled state of FIG. 4, the electrode holding structure 25 that holds the induction electrode 24 is made up of a fixing portion 28, a fixing plate portion 30, and three arm portions 2610. First, each of the structures will be described.

[0059] (b1.Fixed part) The fixing part used in the electrode holding structure of the induction electrode part of the electrostatic spray head will be explained. In this explanation, reference will be made to Figure 5, which shows the fixing part. Note that Figure 5(A) shows a plan view (top surface), Figure 5(B) shows a front view (front), and Figure 5(C) shows a cross section taken along cutting line bb in Figure 5(B).

[0060] As shown in FIG. 5, the fixing portion 28 is made of an insulating material, for example, by injection molding of polyvinyl chloride resin, and has a through hole formed through the cylindrical body, with an internal thread portion 2810 formed on the inflow side of the through hole and opening as a tapered portion 2830 on the outflow side, and chamfered portions 2820 formed at four locations on the outer circumferential surface of the fixing portion 28.

[0061] 4, fixing portion 28 is used to fix arm portion 26 to groove portion 1280 of main body portion 12, and internal thread portion 2810 is threaded into arm fixing thread portion 1290 formed on the outflow side of main body portion 12. When threading, by turning a tool such as a wrench in line with chamfered portion 2820, it is possible to simply and easily thread internal thread portion 2810 into arm fixing thread portion 1290.

[0062] (b2. Fixed plate part) The fixed plate portion used in the electrode holding structure of the induction electrode portion of the electrostatic spray head will be described below. For this description, refer to Figure 6, which shows the fixed plate portion. Note that Figure 6(A) shows a plan view (top surface), and Figure 6(B) shows a cross section taken along line cc in Figure 6(A).

[0063] 6, the fixing plate 30 is made of an insulating material, for example, by injection molding of polyvinyl chloride resin, and is a ring-shaped plate member having a predetermined thickness (height in the vertical direction) with an opening hole 3010 formed through the center, and notches 3020 formed at three locations on the outer periphery for positioning the arm 26. In addition, a positioning protrusion 3030 is formed on the left side of the outer periphery for determining the placement position relative to the groove 1280 of the main body 12 shown in FIG.

[0064] (b3. Arm section) The arm portion used in the electrode holding structure of the induction electrode portion of the electrostatic spray head will now be described. For this explanation, refer to Figure 7, which shows the arm portion. Note that Figure 7(A) shows the left side, Figure 7(B) shows the front (front), and Figure 7(C) shows the right side.

[0065] As shown in FIG. 7, the arm portion 26 is manufactured by injection molding of an insulating material, for example, polyvinyl chloride resin, and is a rectangular member when viewed from the side. As shown in FIG. 7(B), a fulcrum portion 2610 is formed on the outside of the upper end (on the right side in FIG. 7) and protrudes upward, and a pressing portion 2620 is formed on the opposite side and protrudes inward (on the left side in FIG. 7).

[0066] In addition, a protruding portion 2660 is formed on the lower side of the arm portion 26 so as to protrude inward, and an electrode holding portion 2630 that holds the ring portion 2430 of the induction electrode portion 24 is formed at the tip (left end in Figure 7) of the protruding portion 2660.

[0067] Furthermore, drainage holes 2650 serving as a drainage structure are formed in the overhanging portion 2660. The drainage holes 2650 are formed to penetrate in a predetermined drainage direction (the vertical direction in FIG. 7) for draining water particles adhering to the upper surface of the overhanging portion 2660 from the arm portion 26.

[0068] The reference numerals of the various parts of the arm portion 26 are also shown in FIGS. 2 to 4 already shown.

[0069] (b4. Assembly of induction electrode part using electrode holding structure) Next, the assembly of the induction electrode unit using the electrode holding structure will be described, with reference again to FIG.

[0070] 6. In the assembly for holding the induction electrode 24 on the main body 12 using the electrode holding structure 25, first, the three arms 26 are fitted into the notches 3020 of the fixing plate 30 shown in Fig. 6 and positioned in the groove 1280 opening on the lower side of the main body 12. After fitting, the fulcrum portions 2610 on the upper outer sides of the arms 26 abut against the outer corners of the grooves 1280 of the main body 12, and the pressing portions 2620 on the upper inner sides of the arms 26 are floating above the grooves 1280.

[0071] Next, the internal thread portion 2810 of the fixing portion 28 is fitted from below into the arm fixing screw portion 1290 of the main body 12, and the ring portion 2430 of the induction electrode 24 is positioned to align with the electrode holding portion 2630 of the arm 26. In this state, when the fixing portion 28 is turned and screwed into the groove 1280 (upper side), the fixing plate 30 is pressed upward, and the pressing portion 2620 of the arm 26 is pressed toward the groove 1280. As a result, the arm 26 rotates around the fulcrum portion 2610, and the electrode holding portion 2630 tilts inward. Then, as the three arms 26 tilt, the ring portion 2430 of the induction electrode 24 is pressed at three points of the electrode holding portion 2630 of the arm 26, and the central axis of the ring portion 2430 of the induction electrode 24 is maintained centered on the head axis 35.

[0072] (b5. Drainage hole on arm) Next, the drain holes in the arm portion will be described.

[0073] As shown in Figure 3, water supplied from an external pump or the like to the liquid conduit section 18 of the charged spray head 10 passes through the internal flow path of the water side electrode section 14 and is released as water particles from the nozzle section 22 to the outside.The water particles are charged as they pass through the ring section 2430 of the induction electrode section 24, and charged water particles are sprayed onto the target spray area.

[0074] At this time, depending on the relative positions of the outlet of the nozzle portion 22 and the arm portion 26, some of the water particles released from the nozzle portion 22 may also adhere to the upper surface (the surface on the side where the nozzle portion 22 is located) of the extension portion 2660 of the arm portion 26 that holds the ring portion 2430 of the induction electrode portion 24. However, since the extension portion 2660 has a drainage hole 2650 formed therein as a drainage structure, water that attempts to accumulate on the upper surface of the extension portion 2660 flows down from the arm portion 26 through the drainage hole 2650, and the water does not accumulate on the upper surface of the extension portion 2660.

[0075] Therefore, even if water particles emitted from the nozzle portion 22 to the arm portion 26 adhere to the upper surface of the extension portion 2660, they are drained through the drain hole 2650 and do not stagnate, thereby suppressing and preventing fluctuations in the induced electric field generated in the ring portion 2430 of the induction electrode portion 24 and dielectric breakdown.

[0076] [c. Electrostatic spray head with low-flow nozzle] As an embodiment of an electrically charged spray head equipped with an induction electrode section having a small ring diameter, an embodiment of an electrically charged spray head equipped with a low-flow nozzle as a nozzle section will be described as an example. In this description, reference will be made to Figure 8, which shows a cross section of an electrically charged spray head equipped with a low-flow nozzle. Note that Figure 8, like Figure 3, shows a cross section taken along the cutting line aa in Figure 2(A).

[0077] The electrostatic spray head 10 shown in Figure 8 is characterized in that the nozzle section 22 is provided with a low-flow nozzle 60, which discharges water at a rate of, for example, 0.1 liters per minute, instead of the medium-flow nozzle 50. The low-flow nozzle 60 has, for example, a hexagonal bolt surface formed on the outlet side and an external thread formed on the inlet side, and is attached and fixed by screwing it into an internal thread formed on the outlet side of the internal flow path of the water-side electrode section 14 attached to the main body section 12. In addition, the nozzle holder 32 is screwed onto the outside of the attached low-flow nozzle 60.

[0078] In this embodiment, the small water flow nozzle 60 is held by the arm portion 26 so that its outlet is located within the link portion 2430 of the induction electrode portion 24. Since the rest of the structure is the same as in Fig. 3, the same reference numerals are used and their description will be omitted. Note that the outlet of the small water flow nozzle 60 does not necessarily have to be located within the link portion 2430 of the induction electrode portion 24, and the link portion 2430 of the induction electrode portion 24 may be held at a predetermined position in the open space on the outlet side of the nozzle portion 22, as shown in Fig. 3.

[0079] Furthermore, when the outlet of the low-water-volume nozzle 60 is located within the link portion 2430 of the induction electrode portion 24, it is unlikely that the water particles emitted from the outlet of the low-water-volume nozzle 60 will adhere to the upper surface of the protruding portion 2660 of the arm portion 26. However, depending on the structure of the charged spray head, if water flowing through the internal flow path of the liquid conduit portion 18 or the water side electrode portion 14 leaks from gaps that occur between the various components, it may adhere to the protruding portion 2660 of the arm portion 26.

[0080] In this way, even if water or water particles adhere to the upper surface of the extension portion 2660 due to factors other than the water particles released from the nozzle portion 22, they are drained through the drain hole 2650 and do not stagnate, thereby suppressing and preventing fluctuations in the induced electric field generated in the ring portion 2430 of the induction electrode portion 24 and dielectric breakdown.

[0081] In this embodiment, it has been mentioned that water adheres to the upper surface of the extension portion 2660 of the arm portion 26 due to factors other than water particles emitted from the nozzle portion, but this factor may also occur in other embodiments.

[0082] [d. Electrostatic spray head with high-volume nozzle] As an embodiment of an electrically charged spray head equipped with an induction electrode section having a large ring diameter in the link section, an embodiment of an electrically charged spray head equipped with a high-flow nozzle as the nozzle section will be described as an example. In this description, reference will be made to Fig. 9, which shows an electrically charged spray head equipped with a high-flow nozzle, and Fig. 10, which shows the arm section of Fig. 9. Note that Fig. 9, like Fig. 3, shows a cross section taken along line aa in Fig. 2(A), Fig. 10(A) shows the left side, Fig. 10(B) shows the front (front) side, and Fig. 10(C) shows the right side.

[0083] 9 is characterized in that nozzle portion 22 is provided with a high-flow nozzle 70, which discharges water at a rate of, for example, 1.0 liter per minute, instead of medium-flow nozzle 50. High-flow nozzle 70 is a stepped cylinder, for example, with a large diameter on the inlet side and a small diameter on the outlet side, that can be stored in nozzle holder 32, and is attached and fixed by screwing nozzle holder 32, with high-flow nozzle 70 stored therein, into the external threaded portion on the outlet side of water-side electrode portion 14.

[0084] Furthermore, in this embodiment, the diameter of the link portion 2430 of the induction electrode portion 24 is larger than in the medium water discharge nozzle 50 shown in Fig. 3 and the low water discharge nozzle 60 shown in Fig. 8. Therefore, the arm portion 26 of the electrode holding structure 25 that holds the ring portion 2430 of the induction electrode portion 24 is formed with a short protruding portion 2660 corresponding to the large diameter of the ring portion 2430, and the protruding portion 2660 protrudes inward only slightly.

[0085] The extension portion 2660 of the arm portion 26 is formed short, and it is difficult to form drainage holes 2650 in the vertical direction in the extension portion 2660, as is the case with the medium water discharge nozzle 50 shown in Fig. 3 and the low water discharge nozzle 60 shown in Fig. 8, so the drainage holes 2650 are formed diagonally penetrating from the inner L-shaped corner portion of the extension portion 2660 to the outer L-shaped corner portion, as shown in Fig. 10. The rest of the structure of the electrically charged spraying head 10 is the same as in Fig. 3, so the same reference numerals are used and a description thereof will be omitted.

[0086] In this way, even when the extension portion 2660 is formed short, the drain hole 2650 can be formed in the extension portion 2660, and even if water or water particles adhere to the upper surface of the extension portion 2660, they are drained by the drain hole 2650 and do not stagnate, thereby suppressing and preventing fluctuations in the induced electric field generated in the ring portion 2430 of the induction electrode portion 24 and the occurrence of dielectric breakdown.

[0087] [e. Other embodiments of the arm drainage structure] Another embodiment of the drainage structure provided on the arm portion will be described. In this description, reference will be made to Fig. 11, which shows an arm portion having a triangular-roof-shaped drainage structure formed on the protruding portion, and Fig. 12, which shows an arm portion having a dome-roof-shaped drainage structure formed on the protruding portion. Note that Fig. 11(A) shows the front (front view), Fig. 11(B) shows a cross section taken along section line dd in Fig. 11(A), Fig. 12(A) shows the front (front view), and Fig. 12(B) shows a cross section taken along section line ee in Fig. 12(A).

[0088] 11 is formed as a triangular roof portion 2670 having a triangular roof shape with the upper side being the apex of a triangle on overhanging portion 2660 of arm portion 26. Therefore, even if water particles or the like emitted from the nozzle adhere to triangular roof portion 2670 of arm portion 2610, the water does not accumulate on the upper surface of overhanging portion 2660 but flows down from arm portion 26, and even with this water drainage structure, fluctuations in the induced electric field generated in ring portion 2430 of induction electrode unit 24 and dielectric breakdown can be suppressed or prevented.

[0089] 12 is formed as a dome roof portion 2680 with an arc-shaped upper side on overhanging portion 2660 of arm portion 26. Therefore, even if water particles or the like emitted from the nozzle adhere to dome roof portion 2680 of arm portion 2610, the water does not accumulate on the upper surface of overhanging portion 2660 but flows down from arm portion 26, and even with this water drainage structure, fluctuations in the induced electric field generated in ring portion 2430 of induction electrode 24 and dielectric breakdown can be suppressed or prevented.

[0090] The roof shape of the overhanging portion 2660 is not limited to a triangular or arc shape, but may include any shape that allows the adhering water particles to flow down from the arm portion 26.

[0091] [e. Modifications of the present invention] Modifications of the electrostatic spray head according to the present invention will now be described. In addition to the above-described embodiment, the electrostatic spray head according to the present invention includes the following modifications.

[0092] (Other factors that cause water or water particles to adhere to the arm) In addition to directly adhering to the ring portion of the induction electrode portion, the water particles released from the nozzle portion may float and drift in the space around the charged spray head after being sprayed on the target spray area, and over time may adhere to and stagnate on the arm portion of the electrode support portion, or may adhere to other parts of the charged spray head and form droplets that drip down to the arm portion.In these cases, the water drainage structure makes it possible to remove the water without it stagnating.

[0093] (Liquid drainage structure other than the arm part) In the above embodiment, the liquid drainage structure is described as being provided on the protruding portion of the arm portion, but the location where the liquid drainage structure is provided is not limited to the protruding portion of the arm portion, and it is not prevented from being provided on other locations of the electrode holding structure.

[0094] (others) Furthermore, the present invention is not limited to the above-described embodiment, but includes appropriate modifications that do not impair the objects and advantages thereof, and is not limited by the numerical values ​​shown in the above-described embodiment. [Explanation of symbols]

[0095] 10: Electrostatic spray head 12: Main body 1210: Electrode mounting hole 1240: terminal room 1280 : Groove 1290: Arm fixing screw 14: Water side electrode part 16: Electrode connection part 1640: screw hole 18:Liquid conduit section 20: Main body cover 22: Nozzle section 24: Induction electrode part 2410: Electrode core material 2420: Insulating coating 2430: Ring section 2440: Support part 2450: Cable connection part 25: Electrode holding structure 26: Arm section 2610: Fulcrum part 2620: Pressing part 2630: Electrode holding part 2650: Drain hole 2660: Overhang 2670: Triangular roof 2680: Dome roof 28: Fixed part 30:Fixed plate part 32: Nozzle holder 34: Earth cable 35: Head axis 36: Cable connector 38: Terminal 40: Screw 50: Medium water flow nozzle 60: Low water volume nozzle 70: High water volume nozzle

Claims

1. A charged spray head that sprays liquid particles onto a target area, the liquid particles being charged by an induction electrode that is held by an electrode holding structure so as to be positioned in a space on the nozzle side of the nozzle, and the charged liquid particles being discharged from the nozzle, An electrostatic spray head characterized in that a liquid drainage structure is provided for draining liquid adhering to a predetermined portion of the electrode holding structure.

2. A charged spray head that sprays charged liquid particles onto a target area, a main body having a nozzle for discharging the charged liquid particles; an induction electrode portion that charges the liquid particles emitted from the nozzle portion; an electrode holding structure that holds the induction electrode portion in a space on the discharge side of the nozzle portion; Equipped with the electrode holding structure includes a predetermined number of arms each having an inwardly extending protrusion, the protrusion having an electrode holding portion formed at an end thereof that comes into contact with the induction electrode when the induction electrode is held; An electrostatic spray head characterized in that a liquid drainage structure is provided for draining liquid adhering to a predetermined position of the extension portion of the arm portion.

3. 3. The electrostatic spray head according to claim 2, The electrostatic spray head is characterized in that the liquid drainage structure is a liquid drainage hole formed in a predetermined position of the protruding portion and penetrating in a predetermined direction.

4. 4. The electrostatic spray head according to claim 3, The liquid drainage hole is formed so as to penetrate in a predetermined liquid drainage direction corresponding to the direction in which liquid particles are discharged by the nozzle portion.

5. 4. The electrostatic spray head according to claim 3, the arm portion has an L-shape with one end attached to the outlet side of the main body portion and the other end formed with the electrode holding portion of the protruding portion, The liquid drain hole is formed so as to penetrate from an inner corner portion of the L-shape of the protruding portion to an outer corner portion of the L-shape.

6. 3. The electrostatic spray head according to claim 2, An electrostatic spray head characterized in that the liquid drainage structure has a predetermined roof shape formed at a predetermined position on the inlet side of the protruding portion.

Images