JP7610992B2 - Electrostatic Spray Head - Google Patents

Description

The present invention relates to an electrically charged spray head that can electrically charge and spray a spray agent in the form of a mist.

Conventionally, there is known a spray head that receives a supply of a spray agent such as water, turns it into a mist, and sprays it. The spray head can be installed in a building, for example, and used to extinguish a fire. The spray head can also be used to suppress the generation of dust at construction sites, etc. By providing an electrode section on the spray head and charging the particles of the spray agent with the electric field, it is possible to make it easier for the spray agent to adhere to smoke, the object to be extinguished, or dust. Such an electrically charged spray head can more effectively extinguish fires and remove dust.

An example of an electrically charged spray head used for fire extinguishing is shown in Patent Document 1. An example of an electrically charged spray head used for dust removal is shown in Patent Document 2.

Patent No. 5797905 Patent No. 5973219

The amount of spray agent, particle size, and spray angle required for an electrostatic spray head vary depending on the application, such as fire extinguishing or dust removal. These can be changed by changing the shape and size of the nozzle part of the electrostatic spray head. Also, depending on the shape and size of the nozzle part, electrode parts with different diameters are used.

For this reason, several types of electrostatic spray heads are available with different shapes and sizes of nozzle and electrode parts, but each electrostatic spray head cannot be used for other purposes that require different amounts of spray agent, etc.

In addition, when using an electrostatic spray head, a high voltage is applied to the electrode, which causes the insulating coating that covers the surface of the electrode to deteriorate. When the insulating coating deteriorates and tiny pinholes are formed, the insulating coating breaks down through these holes, reducing its insulating properties. For this reason, the electrode needs to be replaced, but with conventional electrostatic spray heads, it is not easy to replace the electrode.

The present invention was made in consideration of the above problems, and aims to provide an electrostatic spray head whose electrode section can be easily replaced and whose type can also be easily changed.

In order to solve the above problems, the electrostatic spray head of the present invention has a main body portion, a nozzle portion which is one type selected from multiple types and is attached to the main body portion, an electrode portion which is one type selected from multiple types and is arranged in front of the nozzle portion, a plurality of arm portions which hold the electrode portion, a type selected from multiple types that is compatible with the electrode portion, and a fixing member which fixes the arm portions to the main body portion, wherein the main body portion has a space portion on the back side opposite the front side to which the nozzle portion is attached, and a plurality of fixing holes are provided along the circumferential direction at the rear side of the space portion, and one of the fixing holes is selected to connect wiring drawn in from the outside .

The electrically charged spray head of the present invention allows the nozzle and electrode parts to be attached to a common main body by selecting from multiple types. This allows the configuration of the electrically charged spray head to be easily changed depending on the application or purpose.

The main body may have a groove formed along the circumferential direction on the front surface facing the electrode, the arm may have a leg disposed in the groove, and the fixing member may have an engagement portion that moves the fixing member back and forth along the depth direction of the groove, and the fixing member may press the leg against the back side of the groove by the engagement portion to fix it. This allows multiple types of arm portions to be easily attached and detached from the main body using a common fixing member.

The arm portion may have a fulcrum portion provided on the outer periphery of the leg portion and abutting the bottom surface of the groove portion, a pressing portion provided on the inner periphery of the leg portion and pressed by the fixing member, and a holding portion that holds the electrode portion on the inner periphery, and when the pressing portion is pressed by the fixing member, the holding portion side of the arm portion may be tilted toward the inner periphery side with the fulcrum portion as the center. In this way, when the fixing member presses the arm portion, the electrode portion can be held and fixed by the holding portion using the principle of leverage, so that the electrode portion can be reliably fixed with a simple operation.

The fixing member is composed of a first member that fits along the groove and a second member that has the fitting portion and presses the first member, and the first member may have a plurality of notches in the circumferential direction that accommodate the arm portions. This allows the multiple types of arm portions that have a common leg portion to be reliably pressed and swung, and the electrode portion to be firmly held.

The fitting portion of the second member may be formed by a screw portion that screws into the main body portion. This allows the arm portion to be moved so as to be pressed by simply rotating the second member, making it easy to attach and detach the electrode portion. Furthermore, at least one of the multiple types of arm portions may include a holding portion on an inner periphery side that holds the electrode portion, and the holding portion may have a through hole formed along a direction from the front surface to the back surface.

FIG. 2 is a perspective view of an electrically charged spray head relating to a first combination of a nozzle portion and an electrode portion. FIG. FIG. 2 is a perspective view of the main body as viewed from the front side. FIG. FIG. 2 is a cross-sectional view of an electrostatic spray head. FIG. 6 is a partially enlarged view of FIG. 5 . 2 is a perspective view of the main body as viewed from the rear side. FIG. 13 is a perspective view of an electrostatic spray head relating to a second combination of a nozzle portion and an electrode portion. FIG. FIG. FIG. 2 is a cross-sectional view of an electrostatic spray head. 13 is a perspective view of an electrostatic spray head relating to a third combination of a nozzle portion and an electrode portion. FIG. FIG. FIG. 2 is a cross-sectional view of an electrostatic spray head.

An embodiment of the present invention will be described in detail with reference to the drawings. The electrically charged spray head of this embodiment can spray a spray agent such as water in a mist form by electrifying it, and a nozzle section for spraying the spray agent and an electrode section for charging the spray agent can be selectively attached to a common main body section according to the application. In this embodiment, an electrically charged spray head with three different combinations of nozzle sections and electrode sections will be described.

Figure 1 shows an oblique view of an electrically charged spray head 10 relating to a first combination of a nozzle portion 21 and an electrode portion 23. The electrically charged spray head 10 has a main body portion 20, a nozzle portion 21 attached to the main body portion 20, a ring-shaped electrode portion 23 disposed in front of the nozzle portion 21, and three arm portions 26 in the circumferential direction that hold the electrode portion 23. The arm portions 26 are fixed to the main body portion 20 by a fixing member 29 consisting of a first member 50 and a second member 55. In addition, a piping portion 60 for supplying a spray agent is attached to the rear side of the main body portion 20. In this embodiment, the spray agent is water, but it may be another fluid.

A mist of spray agent is sprayed forward from the nozzle section 21. Inside the main body section 20, a spray agent side electrode section 37, which will be described later, is provided. This spray agent side electrode section 37 is the reference voltage (earth) side, and a direct current (steady-state) voltage of, for example, several kV to a dozen kV, or an alternating current or pulsed voltage is applied to the electrode section 23. This creates an external electric field, which acts to charge the particles of the spray agent sprayed from the nozzle section 21. When a positive voltage relative to the reference voltage is applied to the electrode section 23, the particles of the spray agent are negatively charged. On the other hand, when a negative voltage relative to the reference voltage is applied to the electrode section 23, the particles of the spray agent are positively charged.

Figure 2 shows a front view of the arm portion 26. The arm portion 26 has legs 40 that are fixed to the main body portion 20, and a holding portion 48 that holds and fixes the electrode portion 23 on the inner circumference side. The side of the arm portion 26 that faces the legs 40 is referred to as the base end side, and the side of the holding portion 26 is referred to as the tip side. Also, in Figure 2, the left side of the figure, where the holding portion 48 faces, corresponds to the inner circumference side of the main body portion 20, and the right side of the figure corresponds to the outer circumference side of the main body portion 20.

The leg 40 of the arm 26 has an outer circumferential side of the base end surface that protrudes toward the base end, and the outer circumferential end is a fulcrum portion 41. The inner circumferential portion of the leg 40 is a pressing portion 42 that protrudes toward the inner circumferential side. The arm 26 has an extension portion 43 that extends from the leg 40 toward the tip side. The inner circumferential surface of the extension portion 43 is a tapered surface portion 44 that slopes from the base end along the tip side toward the outer circumferential side. The arm 26 has an expansion portion 46 that extends toward the outer circumferential side between the extension portion 43 and the holding portion 48.

Figure 3 shows a perspective view of the main body 20 as seen from the front side. A groove 31 is formed along the circumferential direction on the front surface 30, which is the front side of the main body 20. The groove 31 is formed around the entire circumference of the front surface 30. A threaded portion 31d is formed on the inner peripheral surface 31c of the groove 31. A nozzle mounting portion 33 for fixing the nozzle portion 21 is provided on the inner peripheral side of the inner peripheral surface 31c of the groove 31. The nozzle mounting portion 33 has a space inside, which connects the front side and the back side of the main body 20 and supplies the spray agent from the piping portion 60 to the nozzle portion 21. The main body 20 also has multiple fixing surface portions 35 on its side. The fixing surface portions 35 allow the charged spray head 10 to be fixed to various devices, buildings, etc.

Figure 4 shows an exploded perspective view of the fixing member 29. As described above, the fixing member 29 is composed of the first member 50 and the second member 55. The first member 50 is formed in a ring shape along the groove portion 31 of the main body portion 20. The first member 50 has three notches 51 formed in the circumferential direction to position and accommodate the leg portion 40 of the arm portion 26 in the groove portion 31. The second member 55 is formed in a cylindrical shape and can press the first member 50 with its underside. The inner surface of the second member 55 is formed with a fitting portion 56 that moves forward and backward along the depth direction of the groove portion 31 relative to the main body portion 20. The fitting portion 56 is formed by a screw portion 56a that screws into the screw portion 31d formed on the inner surface 31c of the groove portion 31. Therefore, by rotating the second member 55 relative to the main body 20, the second member 55 moves toward the bottom surface 31b of the groove 31 relative to the main body 20, pressing the first member 50. In addition, an edge 57 that spreads outward toward the outer periphery is formed on the tip side of the second member 55.

Figure 5 shows a cross-sectional view of the electrostatic spray head 10. A piping section 60 extends from the rear side to the inside of the main body section 20. A cover member 61 is provided on the main body section 20 so that the piping section 60 passes through it. In addition, a nozzle section 21 is attached to the nozzle attachment section 33 of the spray agent side electrode section 37.

The leg portion 40 of the arm portion 26 is disposed inside the groove portion 31 of the main body portion 20. The pressing portion 42 of the leg portion 40 is pressed from the front side of the main body portion 20 toward the back side of the groove portion 31 by the fixing member 29, so that the arm portion 26 is fixed to the main body portion 20.

6 shows a partially enlarged view of FIG. 5. Hatching is omitted in FIG. 6. The leg 40 of the arm 26 has the fulcrum 41 on the outer periphery abutting against the bottom surface 31b of the groove 31, and the pressing portion 42 on the inner periphery floating above the bottom surface 31b of the groove 31. When the second member 55 of the fixing member 29 is rotated in the circumferential direction, the second member 55 moves in the direction of the arrow in the figure by the fitting portion 56, and presses the first member 50 against the bottom surface 31b of the groove 31. As a result, the pressing portion 42 of the arm 26 is pressed against the bottom surface 31b of the groove 31. When the pressing portion 42 is pressed, the arm 26 rotates about the fulcrum 41, as shown by the dashed line in the figure, and the holding portion 48 tilts toward the inner periphery. The force of the arm portion 26 tending to tilt in this direction causes the electrode portion 23 to be pressed radially inward by the arm portion 26. Since multiple arm portions 26 are provided in the circumferential direction, the electrode portion 23 is held and fixed by these multiple arm portions 26. When the arm portion 26 is pressed by the fixing member 29 and holds and fixes the electrode portion 23, three points of the leg portion 40, namely, both ends in the thickness direction of the fulcrum portion 41 and the center in the thickness direction of the tip surface of the pressing portion 42, are in pressure contact with the groove portion 31, and the leg portion 40 is stably fixed to the groove portion 31.

Figure 7 shows a perspective view of the main body 20 as seen from the rear side. As described above, the piping section 60 is housed on the rear side of the main body 20. The spray agent side electrode section 37 is disposed at the rear of the space and is fixed with a fixing hexagonal nut 37a. The fixing hexagonal nut 37a has six fixing holes 37b along the circumferential direction. Wiring (not shown) drawn in from the outside is connected to one of the fixing holes 37b. Since multiple fixing holes 37b are provided in the circumferential direction, even if the orientation of the main body 20 or the direction of the wiring is different, the wiring can be fixed to any of the fixing holes 37b without having to route the wiring around too much.

Next, another combination of the nozzle portion and the electrode portion will be described. Figure 8 shows an oblique view of the charged spray head 11 relating to the second combination of the nozzle portion 21 and the electrode portion 24. In Figure 8, the main body portion 20, the spray agent side electrode portion 37, and the fixing member 29 are common to the charged spray head 10 shown in Figure 1. In the charged spray head 11 in Figure 8, the external shape of the nozzle portion 21 is common to Figure 1, but the electrode portion 24 is different from that in Figure 1. The diameter of the ring-shaped portion of the electrode portion 24 is smaller. Therefore, the arm portion 27 also has a different shape from that in Figure 1.

Figure 9 shows a front view of the arm portion 27. The leg portion 40 of the arm portion 27 has the same shape as in Figure 2. Therefore, the arm portion 27 can be fixed in the same manner to the main body portion of Figure 8, which is the same as the main body portion 20 of Figure 1. The arm portion 27 has an extension portion 43 that extends in a straight line from the leg portion 40 to the holding portion 48.

Figure 10 shows a cross-sectional view of the electrostatic spray head 11. In this electrostatic spray head 11, the leg 40 of the arm 27 is located in the groove 31 of the main body 20 and is pressed and fixed by the fixing member 29. The fixing member 29 is fixed to the main body 20 by the fitting portion 56 consisting of the screw portion 56a, so that the worker can attach and detach the fixing member 29 by manually turning the second fixing member 55. By removing the fixing member 29 from the main body 20, the arm 27 and the electrode 24 can be easily removed. In addition, by placing the legs 40 of the multiple arm portions 27 in the groove 31 and rotating the second fixing member 55 while holding the electrode 24 with the holding portion 48, the electrode 24 can be easily attached to the main body 20. Therefore, the electrode 24 can be easily replaced with another type of electrode, or the electrode 24 can be easily replaced without removing the main body 20 from the installed location.

Figure 11 shows an oblique view of an electrically charged spray head 12 relating to a third combination of a nozzle portion 22 and an electrode portion 25. In Figure 11, the main body portion 20 and the fixing member 29 are the same as those of the electrically charged spray head 10 shown in Figure 1. The electrically charged spray head 11 in Figure 11 differs from that in Figure 1 in both the nozzle portion 22 and the electrode portion 25. The diameter of the ring-shaped portion of the electrode portion 25 is smaller than that in Figure 1, and is smaller than that in Figure 9. As a result, the arm portion 28 also has a different shape from that in Figures 1 and 9.

Figure 12 shows a front view of the arm portion 28. The leg portion 40 of the arm portion 27 has the same shape as in Figure 2. Therefore, the arm portion 28 can be fixed in the same manner to the main body portion of Figure 11, which is the same as the main body portion 20 of Figure 1. The arm portion 27 has an extension portion 43 that extends in a straight line from the leg portion 40 to the holding portion 48. The holding portion 48 extends further inward than that shown in Figure 9, and can hold an electrode portion 25 with a smaller diameter.

Figure 13 shows a cross-sectional view of the electrostatic spray head 12. In this electrostatic spray head 12, the leg 40 of the arm 28 is also located in the groove 31 of the main body 20 and is pressed and fixed by the fixing member 29. This allows the arm 28 and the electrode 25 to be easily attached and detached. In addition, a through hole 48a is formed in the holding portion 48 of the arm 28 along the direction from the front to the back. The through hole 48a prevents water from accumulating between the electrode 25 and the arm 28. The through hole 48a also increases the edge surface distance of the arm 28, making it possible to increase the path of current leaking on the surface of the arm 28.

In this way, by using a common main body 20 and fixing member 29, multiple types of nozzles and electrodes can be combined as desired, making it easy to change the type of nozzle or electrode depending on the application or purpose. Also, when the electrode needs to be replaced due to deterioration over time, it can be easily replaced without removing the main body 20 from its installation location. Furthermore, the sharing of parts can reduce costs.

Although an embodiment of the present invention has been described above, the application of the present invention is not limited to this embodiment, and it can be applied in various ways within the scope of its technical concept.

REFERENCE SIGNS LIST 10 Electrostatically charged spray head 11 Electrostatically charged spray head 12 Electrostatically charged spray head 20 Main body 21 Nozzle portion 22 Nozzle portion 23 Electrode portion 24 Electrode portion 25 Electrode portion 26 Arm portion 27 Arm portion 28 Arm portion 29 Fixing member 30 Front portion 31 Groove portion 31a Outer peripheral surface 31b Bottom surface 31c Inner peripheral surface 32d Thread portion 33 Nozzle mounting portion 35 Fixing surface portion 36 Pipe storage portion 37 Spray agent side electrode portion 38a Hexagonal fixing nut 37b Fixing hole 40 Leg portion 41 Support portion 42 Pressing portion 43 Extension portion 44 Tapered surface portion 46 Expansion portion 48 Holding portion 48a Through hole 50 First member 51 Cutout portion 55 Second member 56 Fitting portion 56a Threaded portion 57 Edge portion 60 Pipe portion 61 Cover member

Claims (6)

A main body portion,
A nozzle portion, one of a plurality of types of nozzles being selected and attached to the main body portion;
an electrode portion, one of a plurality of types of electrodes being selected and disposed in front of the nozzle portion;
A plurality of arm portions, one of which is selected from a plurality of types to match the electrode portion, and which hold the electrode portion;
A fixing member that fixes the arm portion to the main body portion;
having
The main body portion has a space on the rear side opposite to the front side where the nozzle portion is attached, and a plurality of fixing holes are provided along the circumferential direction at the rear side of the space, and one of the fixing holes is selected to connect wiring drawn in from the outside, forming an electrostatic spray head. the main body has a groove formed along a circumferential direction on a front surface thereof facing the electrode portion,
The arm portion has a leg portion disposed in the groove portion,
The electrostatic spray head according to claim 1, wherein the fixing member has an engaging portion that moves the fixing member back and forth along the depth direction of the groove portion, and the engaging portion causes the fixing member to press the leg portion toward the back side of the groove portion to fix it. the arm portion has a fulcrum portion provided on an outer periphery of the leg portion and abutting a bottom surface of the groove portion, a pressing portion provided on an inner periphery of the leg portion and pressed by the fixing member, and a holding portion on the inner periphery thereof for holding the electrode portion,
The electrostatic spray head according to claim 2 , wherein the pressing portion is pressed by the fixing member, so that the arm portion is inclined with the holding portion side toward the inner periphery side about the fulcrum portion. the fixing member includes a first member that fits along the groove portion and a second member that has the fitting portion and presses the first member,
4. The electrostatic spraying head according to claim 2, wherein the first member has a plurality of cutouts in a circumferential direction for receiving the arm portions. The electrostatic spray head according to claim 4, wherein the fitting portion of the second member is formed by a threaded portion that screws into the main body portion. An electrostatic spray head as described in any one of claims 1 to 5, wherein at least one of the multiple types of arm portions is provided with a holding portion on the inner circumference side for holding the electrode portion, and the holding portion has a through hole formed along the direction from the front to the back.

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