JP2023103040A - Nozzle device - Google Patents

Abstract

To provide a nozzle device enabling increase of a mixed mist application range by one nozzle device.SOLUTION: A body 16 comprises a mixing chamber 22. A liquid ejection port 70 and a first air ejection port 48 open to a bottom surface 34 of the mixing chamber 22. A second air ejection port 80 is arranged in a radially outer side than the first air ejection port 48 in a radial direction of the mixing chamber 22. The second air ejection port 80 ejects second air AB to the mixing chamber 22 and forms swirl flow of the second air AB.SELECTED DRAWING: Figure 5

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a nozzle device that mixes liquid and air and jets them outward.

A nozzle device disclosed in Patent Document 1 includes a nozzle body. The tip of the nozzle body includes a ring-shaped gas ejection port and a ring-shaped liquid ejection port. The liquid ejection port is arranged radially inward of the gas ejection port.

A gas flow path provided inside the nozzle body has a swirling groove. As the gas passes through the swirl groove, the gas becomes a swirling flow and is discharged from the gas outlet.

The liquid is discharged from the liquid discharge port to the outside, and the liquid is attracted to the swirling gas discharged from the gas discharge port and mixed with the gas. The liquid and the gas are mixed and atomized while swirling, and the mixed mist in the form of swirling flow is jetted toward the object.

Japanese Patent Application Laid-Open No. 2005-288390

When spraying and applying mixed mist to a large object such as a mold using the nozzle device described above, there is a method in which the nozzle device is moved according to the injection range of the mixed mist, and the mixed mist is uniformly sprayed and applied to the surface of the object. However, there is a problem that the injection time per object becomes long. Therefore, there is a method of applying by arranging a plurality of nozzle devices. However, when applying using a plurality of nozzle devices, there is a problem that equipment investment increases by the number of nozzle devices. Therefore, there is a demand to expand the application range of the mixed mist by one nozzle device.

An object of the present invention is to solve the problems described above.

Aspects of the present invention include a liquid passage through which a liquid is supplied;
an annular first air passage that surrounds the liquid passage and is supplied with first air;
a liquid ejection port disposed at a downstream end of the liquid passage and ejecting the liquid;
a first air discharge port disposed at a downstream end of the first air passage, surrounding the liquid discharge port, and discharging the first air;
a swirling flow forming part arranged in the first air passage and swirling the first air around the first air discharge port;
having a body with
A nozzle device that mixes the first air swirled by the swirl flow forming portion and ejected from the first air ejection port with the liquid ejected from the liquid ejection port, atomizes the liquid, and ejects the liquid toward an object,
the body includes a second air passage to which second air is supplied;
a mixing chamber having a circular peripheral wall surface when viewed from the opening direction of the first air ejection port and the liquid ejection port, and a bottom surface on which the liquid ejection port and the first air ejection port open, and being exposed to the outside of the body for mixing the first air ejected from the first air ejection port and the liquid ejected from the liquid ejection port;
a second air discharge port disposed at the downstream end of the second air passage, opening into the mixing chamber outside the first air discharge port in the radial direction of the mixing chamber, and discharging the second air into the mixing chamber to form a swirling flow of the second air;
Prepare.

According to the present invention, the following effects are obtained.

That is, when the first air and the liquid are mixed in the mixing chamber, the second air is discharged into the mixing chamber from the second air discharge port opened in the mixing chamber. In the mixing chamber, the second air forms a swirling flow along the peripheral wall surface. Accordingly, by adding the swirling flow of the second air to the first air and the liquid, the swirling flow of the first air and the liquid swirling in the mixing chamber can be further strengthened.

As a result, when spraying the atomized liquid toward the object, even if the injection angle of the liquid is widened, the liquid to which the swirling flow of the second air is added can reach the object and be applied. As a result, it is possible to achieve both the enlargement of the injection angle of the liquid and the injection distance. Therefore, it is possible to expand the range in which the liquid can be applied by the nozzle device.

FIG. 1 is a schematic explanatory diagram showing a case where a mold release agent is applied to a mold by a nozzle device according to an embodiment of the present invention. FIG. 2 is an external perspective view of the nozzle device. 3 is a cross-sectional view taken along line III-III of FIG. 2. FIG. 4 is a plan view of the nozzle device shown in FIG. 2. FIG. 5 is a cross-sectional view showing a state in which a release agent is sprayed from the nozzle device of FIG. 3. FIG.

This nozzle device 10 is used, as shown in FIG. 1, to apply a release agent L to a mold W used for casting. The nozzle device 10 is attached to the outer surface 121 of the spray head 12 . A plurality of nozzle devices 10 are spaced apart from each other in the spray head 12 . The direction of spraying of the nozzle device 10, the number of nozzles to be arranged, or the position of arrangement are appropriately set according to the shape and size of the object. The spray head 12 is fixed to the tip of the robot arm 14 . The spray head 12 is movable by a robot arm 14 . Note that the nozzle device 10 can also be used for the purpose of applying liquid to objects other than molds.

Before performing casting molding, the spray head 12 is moved to face the molding surface Z of the mold W that has been released, and the mold release agent L is applied from the nozzle device 10 to the molding surface Z of the mold W. A molding surface Z of the mold W is an object to which the release agent L is applied by the nozzle device 10 .

The nozzle device 10 includes a body 16 and a liquid diffusion portion 18, as shown in FIGS. 1-5.

The body 16 has a substantially rectangular shape when viewed from the axial direction. When viewed from the axial direction of body 16, body 16 has four corners 20 (see FIG. 4). The body 16 includes a mixing chamber 22 , a pair of mounting portions 24 , a first air supply portion 26 , a liquid supply portion 28 , a second air supply portion 30 and a swirling flow forming portion 32 . The liquid supplied to the liquid supply part 28 is the release agent L applied to the molding surface Z of the mold W. As shown in FIG. The air supplied to the first and second air supply units 26, 30 is compressed air.

A tip portion of the body 16 , which is one axial end of the body 16 , is provided with a mixing chamber 22 . The proximal end of the body 16 , which is the other axial end of the body 16 , is attached to the outer surface 121 of the spray head 12 .

The mixing chamber 22 is arranged at the distal end of the body 16 along the axial direction. The mixing chamber 22 opens at the tip surface 161 of the body 16 . The mixing chamber 22 is exposed outside the body 16 . The mixing chamber 22 is circular when viewed from the axial direction of the body 16 shown in FIG. The mixing chamber 22 is axially recessed from the distal end of the body 16 toward the proximal end. The mixing chamber 22 is arranged on the axis of the body 16 .

The mixing chamber 22 has a bottom surface 34 and a peripheral wall surface 36 . The bottom surface 34 is a circular surface perpendicular to the axis of the body 16 . Bottom surface 34 is parallel to the tip of body 16 . The bottom surface 34 is separated from the tip of the body 16 by a predetermined distance.

The peripheral wall surface 36 extends from the outer edge of the bottom surface 34 to the tip of the body 16 . The peripheral wall surface 36 is annular. The peripheral wall surface 36 is an inclined surface that expands radially outward from the bottom surface 34 toward the tip of the body 16 . That is, the mixing chamber 22 has a truncated cone shape that gradually expands toward the tip of the body 16 .

The mounting portions 24 are arranged at two corner portions 20 that are diagonal with respect to the axis of the body 16 . A fastening bolt 38 secures the mounting portion 24 to the spray head 12 .

In the body 16, the first air supply portion 26 is arranged radially outward of a liquid supply portion 28, which will be described later. A first air supply portion 26 surrounds the liquid supply portion 28 .

The first air supply portion 26 includes a first air supply port 44 , a first air passage 46 and a first air discharge port 48 . The first air supply port 44 opens at the proximal end of the body 16 . The first air supply port 44 is connected to the air supply passage 50 of the spray head 12 when the body 16 and the spray head 12 are connected. An O-ring 51 is arranged between the first air supply port 44 and the air supply passage 50 of the spray head 12 . The air supply path 50 is connected to a first air supply source 52 (see FIG. 1) capable of supplying compressed air (hereinafter referred to as first air AA). The first air AA is supplied to the first air supply port 44 through the air supply path 50 .

The first air passage 46 includes a communication passage 54 , a first air chamber 56 , a second air chamber 58 and a third air chamber 60 . The communication passage 54 , the first air chamber 56 , the second air chamber 58 and the third air chamber 60 are arranged in this order from the base end surface 162 toward the tip end surface 161 of the body 16 .

The communication passage 54 is connected to the first air supply port 44 . The communication passage 54 extends from the first air supply port 44 toward the tip of the body 16 . The communication path 54 extends along the axial direction of the body 16 .

The first air chamber 56, the second air chamber 58 and the third air chamber 60 are all annular. The upstream end of the first air chamber 56 is connected to the downstream end of the communication passage 54 .

The upstream end of the second air chamber 58 is connected to the downstream end of the first air chamber 56 . The outer peripheral surface of the second air chamber 58 is arranged radially inward from the outer peripheral surface of the first air chamber 56 . That is, the second air chamber 58 is smaller in diameter than the first air chamber 56 in the radial direction.

The upstream end of the third air chamber 60 is connected to the downstream end of the second air chamber 58 . The outer peripheral surface of the third air chamber 60 is arranged radially inward from the outer peripheral surface of the second air chamber 58 .

An annular projecting portion 62 is provided at the tip of the third air chamber 60 . The protruding portion 62 protrudes radially inward from the inner peripheral surface of the third air chamber 60 . The inner peripheral surface of the projecting portion 62 is arranged radially inwardly of the inner peripheral surface of the third air chamber 60 .

The tip of the third air chamber 60 and the tip of the projecting portion 62 have an inclined surface 64 . The inclined surface 64 is annular. The inclined surface 64 is inclined radially inward from the outer peripheral surface of the third air chamber 60 so as to approach the mixing chamber 22 . The inclined surface 64 is formed continuously from the third air chamber 60 to the projecting portion 62 . The inclined surface 64 defines the exit angle of the mixed mist M (compressed air) ejected from the first air supply portion 26 toward the mixing chamber 22 . The outlet angle θ1 of the first air supply portion 26 is, for example, 120° (see FIG. 3).

The first air discharge port 48 is arranged at the downstream end (tip) of the first air passage 46 . The first air outlet 48 opens to the bottom surface 34 of the mixing chamber 22 . When viewed from the axial direction of the body 16 shown in FIG. 4, the first air discharge port 48 has a circular shape. The first air outlet 48 is arranged in the center of the bottom surface 34 . The base end of the first air discharge port 48 is connected to the third air chamber 60 and the tip of the projecting portion 62 .

In the first air supply portion 26, the first air supply port 44, the first air passage 46, and the first air discharge port 48 communicate with each other. The first air AA supplied from the first air supply source 52 to the first air supply port 44 flows through the first air passage 46 to the first air discharge port 48 .

The liquid supply portion 28 includes a liquid supply port 66 , a liquid passage 68 and a liquid ejection port 70 . The liquid supply port 66 is separated from the first air supply port 44 and opens to the base end surface 162 of the body 16 . When the body 16 and the spray head 12 are connected, the liquid supply port 66 is connected with the liquid supply channel 72 of the spray head 12 (see FIG. 3). An O-ring 73 is positioned between the liquid supply port 66 and the liquid supply passage 72 of the spray head 12 . The liquid supply path 72 is connected to a liquid supply source 74 (see FIG. 1) capable of supplying the release agent (liquid) L. As shown in FIG. A release agent L is supplied to the liquid supply port 66 through the liquid supply path 72 .

A liquid passageway 68 is connected to the liquid supply port 66 . A liquid passageway 68 extends from the liquid supply port 66 toward the distal end of the body 16 . An intermediate portion between the upstream end and the downstream end of the liquid passage 68 is curved. The proximal end of the liquid passageway 68 is spaced radially outwardly with respect to the axis of the body 16 . The distal end of the liquid passageway 68 extends along the axis of the body 16 on the axis of the body 16 . Note that the liquid passage 68 may be linear along the axial direction of the body 16 .

The liquid discharge port 70 is arranged at the downstream end (tip) of the liquid passage 68 . Liquid outlet 70 opens into bottom surface 34 of mixing chamber 22 . When viewed from the axial direction of the body 16 shown in FIG. 4, the liquid ejection port 70 has a circular shape. The liquid outlet 70 is arranged in the center of the bottom surface 34 concentrically with the first air outlet 48 . The liquid ejection port 70 is arranged inside the first air ejection port 48 . The liquid outlet 70 has a smaller diameter than the first air outlet 48 . The opening end of the liquid discharge port 70 is located a predetermined distance closer to the proximal end than the bottom surface 34 of the mixing chamber 22 and the opening end of the first air discharge port 48 .

The second air supply section 30 is arranged so as to surround the first air supply section 26 . The second air supply portion 30 includes a second air supply port 76 , a second air passage 78 and a second air discharge port 80 .

The second air supply port 76 opens on a side surface 163 between the distal end surface 161 and the proximal end surface 162 of the body 16 . The second air supply port 76 is arranged on the side surface 163 of the body 16 in close proximity to the tip end surface 161 of the body 16 . An air supply pipe 82 is connected to the second air supply port 76 (see FIG. 3). The air supply pipe 82 is connected to a second air supply source 84 (see FIG. 1) capable of supplying compressed air (hereinafter referred to as second air AB). A second air AB is supplied to the second air supply port 76 through the air supply pipe 82 . The air supply pipe 82 can be connected to a second air supply port 76 opened on the side surface 163 of the body 16 . Therefore, attachment/detachment of the air supply pipe 82 to/from the body 16 is easy.

The second air passage 78 includes an annular passage 86 communicating with the second air supply port 76 and a connecting passage 88 communicating with the annular passage 86 . The annular passage 86 is arranged radially outward of the second and third air chambers 58 , 60 in the first air passage 46 . The end of the second air supply port 76 is connected to the outer circumference of the annular passage 86 so as to communicate therewith.

The connecting passage 88 is connected to the annular passage 86 in the distal direction. In this embodiment, two connecting passages 88 are arranged at equal intervals along the circumferential direction of the annular passage 86 . Note that only one connecting passage 88 may be arranged. Three or more connecting passages 88 may be arranged at equal intervals along the circumferential direction of the annular passage 86 . Although two connecting passages 88 are arranged symmetrically in FIG.

A proximal end of the connecting passage 88 is connected to a distal end of the annular passage 86 . The distal end of the connecting passage 88 is arranged radially inward from the proximal end of the connecting passage 88 . The connecting passage 88 slopes radially inward toward the distal end.

The connecting passage 88 extends tangentially to the mixing chamber 22 when viewed from the axial direction of the body 16 shown in FIG.

The second air discharge port 80 is arranged at the tip of each connecting passage 88 . In this embodiment, two second air outlets 80 are arranged on opposite sides of the first air outlet 48 . The two second air discharge ports 80 are arranged at equal intervals in the circumferential direction of the peripheral wall surface 36 . Note that only one second air ejection port 80 may be arranged. Three or more second air outlets 80 may be arranged at equal intervals along the circumferential direction of the peripheral wall surface 36 . The second air discharge port 80 opens to the peripheral wall surface 36 of the mixing chamber 22 . The second air discharge port 80 is arranged on the peripheral wall surface 36 at a position close to the bottom surface 34 . The second air discharge port 80 is arranged radially offset from the first air discharge port 48 in the mixing chamber 22 .

The end of the connecting passage 88 is tangentially connected to the peripheral wall surface 36 of the mixing chamber 22 to form the second air discharge port 80 . The second air discharge port 80 has an oblong shape elongated along the circumferential direction of the peripheral wall surface 36 .

The swirling flow forming portion 32 is housed in the third air chamber 60 of the first air passage 46 . The swirling flow forming portion 32 has a plurality of blades 90 arranged at regular intervals along the circumferential direction of the third air chamber 60 . The vane 90 extends along the axial direction of the body 16 .

When viewed from the axial direction of the body 16 shown in FIG. 4 , the radially outer ends of the blades 90 are arranged radially outward in the third air chamber 60 . A radial inner end of the blade 90 is arranged radially inward in the third air chamber 60 . The tip of the radially inner end portion of the blade 90 faces the first air discharge port 48 .

When viewed from the axial direction of the body 16 shown in FIG. 4 , the radially inner end of the blade 90 is arranged at a position that is counterclockwise with respect to the radially outer end of the blade 90 . The vane 90 extends tangentially to the outer edge of the first air outlet 48 .

When the first air AA is supplied to the first air passage 46, the first air AA flows along the plurality of blades 90 in the third air chamber 60, turns counterclockwise, and flows toward the first air discharge port 48.

The liquid diffusion section 18 is arranged inside the mixing chamber 22 .

The liquid diffusion portion 18 is spaced apart from the liquid ejection port 70 in the axial direction of the body 16 and faces the liquid ejection port 70 . The liquid diffusion part 18 is arranged in the axial center of the mixing chamber 22 . The tip of the liquid diffusion portion 18 and the tip of the body 16 are arranged at the same position in the axial direction of the body 16 . That is, the liquid diffusion part 18 does not protrude from the tip of the body 16 .

The liquid diffusion portion 18 includes a cylindrical portion 96 and a conical portion 98 . The cross-sectional shape of the columnar portion 96 is circular when viewed from the axial direction of the liquid diffusion portion 18 shown in FIG. The diameter of the cylindrical portion 96 is constant along the axial direction. The tip of the cylindrical portion 96 is flush with the tip surface 161 of the body 16 in the axial direction of the body 16 . The diameter of the cylindrical portion 96 and the diameter of the liquid passage 68 are the same.

A conical portion 98 is disposed at the proximal end of the cylindrical portion 96 . The conical portion 98 has a shape that tapers toward the liquid ejection port 70 . The outer peripheral surface of the conical portion 98 is a tapered surface that is inclined with respect to the axis of the liquid diffusion portion 18 . The conical portion 98 faces the first air outlet 48 of the first air supply section 26 and the liquid outlet 70 of the liquid supply section 28 . The spread angle θ2 of the outer peripheral surface of the conical portion 98 is greater than or equal to the outlet angle θ1 of the first air supply portion 26 (θ2≧θ1). The expansion angle θ2 of the outer peripheral surface of the conical portion 98 is set according to the separation distance between the tip of the nozzle device 10 and the molding surface Z of the mold W, which is the object.

The liquid diffusion part 18 is supported by the tip of the body 16 via a pair of struts 941 and 942 . One column 941 and the other column 942 extend in directions away from each other with the liquid diffusion section 18 as the center. One ends of the struts 941 and 942 are connected to the periphery of the peripheral portion of the mixing chamber 22 . The other ends of the columns 941 and 942 are connected to the outer peripheral surface of the cylindrical portion 96 of the liquid diffusion portion 18 . The struts 941 and 942 are arranged in a straight line. A pair of struts 941 and 942 position the liquid diffuser 18 in the center of the mixing chamber 22 .

Next, operation of the nozzle device 10 will be described.

First, as shown in FIG. 1, the robot arm 14 is driven so that the outer surface 121 of the spray head 12 faces the molding surface Z of the mold W before casting. The tip of the nozzle device 10 faces the forming surface Z. As shown in FIG. The tip of the nozzle device 10 and the molding surface Z of the mold W are separated by a predetermined distance, which is the injection distance C. As shown in FIG.

Next, as shown in FIG. 5, first air AA, which is compressed air, is supplied from the first air supply source 52 through the air supply passage 50 to the first air supply port 44 . A second air AB, which is compressed air, is supplied from a second air supply source 84 to the second air supply port 76 through the air supply pipe 82 . A liquid release agent L is supplied from a liquid supply source 74 to the liquid supply port 66 through the liquid supply path 72 .

The first air AA flows from the first air supply port 44 to the first air passage 46 through the communication passage 54 . The first air AA flows from the communication passage 54 to the second air chamber 58 and the third air chamber 60 through the annular first air chamber 56 . As a result, the first air AA flows downstream in the first air passage 46 so as to gradually move toward the center of the body 16 . In the third air chamber 60 , the first air AA flows between the blades 90 in the swirling flow forming portion 32 . As the first air AA flows downstream along the blades 90, the first air AA swirls counterclockwise when viewed from the axial direction of the body 16 in FIG. The first air AA flows toward the first air discharge port 48 along the inclined surface 64 while turning counterclockwise. The first air AA is discharged into the mixing chamber 22 from the bottom surface 34 of the mixing chamber 22 through the first air discharge port 48 .

By discharging the first air AA into the mixing chamber 22 along the inclined surface 64, as shown in FIG. The discharge angle of the first air AA corresponds to the inclination angle of the inclined surface 64 . That is, when the first air AA is discharged from the first air discharge port 48 into the mixing chamber 22, the first air AA is discharged so as to intersect with the opening center of the first air discharge port 48 interposed therebetween.

The first air AA flows counterclockwise along the mixing chamber 22 toward the tip of the body 16 .

The release agent L flows from the liquid supply port 66 to the liquid discharge port 70 through the liquid passage 68 . The release agent L is discharged into the mixing chamber 22 from the bottom surface 34 of the mixing chamber 22 through the liquid discharge port 70 . The release agent L is discharged from the center of the bottom surface 34 into the mixing chamber 22 . Part of the release agent L discharged into the mixing chamber 22 is sucked into the swirling first air AA discharged from the first air discharge port 48 . Part of the release agent L is mixed with the first air AA and atomized.

The remaining part of the release agent L travels straight from the liquid discharge port 70 toward the tip and contacts the conical portion 98 of the liquid diffusion portion 18 . When the release agent L comes into contact with the conical portion 98 , the release agent L diffuses radially outward along the outer peripheral surface of the conical portion 98 . As a result, the remaining part of the release agent L is joined and mixed with the swirling first air AA discharged from the first air discharge port 48 on the radially outer side of the liquid diffusion portion 18 .

The release agent L is atomized into a mixed mist M by being mixed with the swirling first air AA. The mixed mist M moves toward the tip of the body 16 while swirling counterclockwise along the peripheral wall surface 36 in the mixing chamber 22 . As the mixed mist M swirls along the peripheral wall surface 36 toward the tip, the mixed mist M gradually expands radially outward along the peripheral wall surface 36 .

The second air AB flows through the second air supply port 76 toward the center of the body 16 and into the annular passage 86 . The second air AB flows from the tip of the annular passage 86 to the connecting passage 88 . The second air AB flows through the connecting passage 88 to the pair of second air discharge ports 80 respectively. The connecting passage 88 is tangentially connected to the peripheral wall surface 36 , and the second air discharge port 80 opens along the peripheral direction of the peripheral wall surface 36 .

Therefore, the second air AB is discharged along the peripheral wall surface 36 of the mixing chamber 22 through the second air discharge port 80 . When viewed from the axial direction of the body 16 shown in FIG. 4, the direction of discharge of the second air AB from the second air discharge port 80 is the counterclockwise direction. That is, the swirling direction of the first air AA discharged from the first air outlet 48 and the swirling direction of the second air AB discharged from the second air outlet 80 are the same. The second air outlet 80 is arranged radially outward of the mixing chamber 22 with respect to the first air outlet 48 . Therefore, it is possible to effectively generate a swirling flow in the mixing chamber 22 by the second air AB discharged from the second air discharge port 80 .

As the second air AB swirls along the peripheral wall surface 36, the swirling flow of the second air AB is added to the swirling flow of the mixed mist M composed of the first air AA and the release agent L. Thereby, the swirling flow of the mixed mist M can be strengthened in the mixing chamber 22 . In other words, the swirl velocity of the mixed mist M in the mixing chamber 22 can be increased.

The mixed mist M is jetted from the tip of the mixing chamber 22 in a direction away from the body 16 . The mixed mist M is injected at a predetermined injection angle D (see FIGS. 1 and 5) so as to expand radially outward from the tip of the peripheral wall surface 36 . At this time, even when the injection angle D of the mixed mist M is widened to make it wider than the conventional nozzle device, the mixed mist M injected toward the molding surface Z of the mold W can be sufficiently reached to the molding surface Z to apply the release agent L. This is because the swirling speed of the mixed mist M in the mixing chamber 22 is increased.

As a result, the nozzle device 10 uniformly applies the atomized mold release agent L to the molding surface Z of the mold W. As shown in FIG. The injection angle D of the mixed mist M corresponds to the inclination angle of the peripheral wall surface 36 . That is, it is possible to widen the injection angle D of the mixed mist M to achieve a wider angle than the conventional nozzle device.

As described above, in the embodiment of the present invention, the first air AA swirled by the swirl flow forming section 32 is discharged from the first air outlet 48 into the mixing chamber 22 . A release agent L is discharged from the liquid discharge port 70 into the mixing chamber 22 . The swirled first air AA and the release agent L are mixed in the mixing chamber 22 to form a mixed mist M. As shown in FIG. The second air AB is discharged from the second air discharge port 80 toward the mixing chamber 22 and forms a swirling flow in the mixing chamber 22 .

Therefore, the swirling flow of the second air AB can strengthen the swirling flow of the mixed mist M swirling in the mixing chamber 22 . As a result, when the mixed mist M is jetted from the tip of the body 16 toward the molding surface Z of the metal mold W as an object, even if the injection angle D of the mixed mist M is widened, the swirling mixed mist M can reach the molding surface Z to surely coat the molding surface Z.

As a result, widening of the injection angle D of the mixed mist M injected toward the mold W and the injection distance C can be both suitably achieved (see FIG. 1). Therefore, the coating range of the release agent L by one nozzle device 10 can be expanded. The number of nozzle devices 10 attached to the spray head 12 can be reduced, and the equipment investment can be reduced.

The swirling flow of the second air AB increases the swirling velocity of the mixed mist M in the mixing chamber 22 . As a result, the mixed mist M can be reliably and stably injected from the nozzle device 10 toward the mold W. As a result, the mold release agent L atomized by the mixed mist M can be stably and uniformly applied to the molding surface Z of the mold W.

A peripheral wall surface 36 of the mixing chamber 22 expands in diameter from the bottom surface 34 of the mixing chamber 22 toward the discharge direction of the first air AA and the release agent L. As shown in FIG. As a result, the mixed mist M obtained by mixing the first air AA and the release agent L in the mixing chamber 22 is swirled along the peripheral wall surface 36 . As a result, the mixed mist M is circulated while being gradually expanded radially outward by the peripheral wall surface 36, and can be sprayed from the tip of the body 16 toward the mold W at a wide angle.

A pair of second air outlets 80 are arranged along the peripheral wall surface 36 of the mixing chamber 22 . Therefore, by discharging the second air AB from the pair of second air discharge ports 80 to the peripheral wall surface 36, a swirling flow of the second air AB along the circumferential direction of the peripheral wall surface 36 can be effectively created.

A connecting passage 88 of the second air passage 78 is tangentially connected to the peripheral wall surface 36 of the mixing chamber 22 . Therefore, the second air AB can be discharged along the peripheral wall surface 36 from the second air discharge port 80 through the connecting passage 88, and a swirling flow of the second air AB can be reliably generated along the peripheral wall surface 36.

The liquid diffusion part 18 faces the liquid ejection port 70 in the mixing chamber 22 . The liquid diffusion portion 18 diffuses the release agent L discharged from the liquid discharge port 70 radially outward from the center of the opening of the liquid discharge port 70 . Thereby, the release agent L ejected from the liquid ejection port 70 arranged in the center of the mixing chamber 22 can be diffused by the liquid diffusion portion 18 . As a result, the first air AA discharged from the first air discharge port 48 and the release agent L can be suitably mixed, and the release agent L can be atomized.

The liquid diffusion portion 18 has a conical portion 98 that faces the liquid ejection port 70 and tapers toward the liquid ejection port 70 . As a result, the liquid ejected from the liquid ejection port 70 can be diffused radially outward by the outer peripheral surface of the conical portion 98 . The first air AA discharged from the first air discharge port 48 and the release agent L can be suitably mixed, and the atomization of the release agent L can be promoted. As a result, the mixed mist M can be jetted toward the mold W at a wide jetting angle D.

The first air AA is supplied from the first air supply source 52 to the first air passage 46 and the second air AB is supplied from the second air supply source 84 to the second air passage 78 . Therefore, the flow rate of the first air AA and the flow rate of the second air AB can be adjusted separately. Thereby, only the flow rate of the second air AB discharged from the second air discharge port 80 to the mixing chamber 22 can be adjusted, and the strength of the swirling flow of the second air AB in the mixing chamber 22 can be adjusted. By increasing the flow rate of the second air AB, the flow velocity of the swirl flow can be increased and the jet can be made stronger toward the mold W.

The above embodiments can be summarized as follows.

The above embodiment includes a liquid passageway (68) through which liquid (L) is supplied;
an annular first air passage (46) surrounding the liquid passage and supplied with first air (AA);
a liquid ejection port (70) disposed at the downstream end of the liquid passage and ejecting the liquid;
a first air discharge port (48) disposed at the downstream end of the first air passage, surrounding the liquid discharge port, and discharging the first air;
a swirling flow forming part (32) arranged in the first air passage and swirling the first air around the first air outlet;
having a body (16) with
A nozzle device (10) that mixes the first air swirled by the swirling flow forming portion and ejected from the first air ejection port and the liquid ejected from the liquid ejection port, atomizes the liquid, and ejects the liquid toward an object,
The body includes a second air passage (78) to which second air (AB) is supplied;
a mixing chamber (22) having a circular peripheral wall surface (36) viewed from the opening direction of the first air outlet and the liquid outlet, and a bottom surface (34) through which the liquid outlet and the first air outlet open, and being exposed to the outside of the body for mixing the first air discharged from the first air outlet and the liquid discharged from the liquid outlet;
a second air discharge port (80) disposed at the downstream end of the second air passage, opening into the mixing chamber outside the first air discharge port in the radial direction of the mixing chamber, and discharging the second air into the mixing chamber to form a swirling flow of the second air;
Prepare.

The peripheral wall surface of the mixing chamber increases in diameter from the bottom surface toward the discharge direction of the first air and the liquid.

A plurality of the second air outlets are arranged along the peripheral wall surface.

The second air passage is connected tangentially to the peripheral wall surface.

A liquid diffusing portion (18) facing the liquid ejection port in the mixing chamber is provided for diffusing the liquid ejected from the liquid ejection port radially outward from the center of the opening of the liquid ejection port.

The liquid diffuser has a conical surface (98) facing the liquid outlet and tapering toward the liquid outlet.

The first air is supplied to the first air passage from a first air supply source (52), and the second air is supplied to the second air passage from a second air supply source (84) different from the first air supply source.

It should be noted that the present invention is not limited to the above-described embodiments, and can take various configurations without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10... Nozzle device 16... Body 18... Liquid diffusion part 22... Mixing chamber 36... Peripheral wall surface 46... First air passage 48... First air discharge port 68... Liquid passage 70... Liquid discharge port 78... Second air passage 80... Second air discharge port 98... Conical part AA... First air AB... Second air W... Mold

Claims (7)

a liquid passage through which liquid is supplied;
an annular first air passage that surrounds the liquid passage and is supplied with first air;
a liquid ejection port disposed at a downstream end of the liquid passage and ejecting the liquid;
a first air discharge port disposed at a downstream end of the first air passage, surrounding the liquid discharge port, and discharging the first air;
a swirling flow forming part arranged in the first air passage and swirling the first air around the first air discharge port;
having a body with
A nozzle device that mixes the first air swirled by the swirl flow forming portion and ejected from the first air ejection port with the liquid ejected from the liquid ejection port, atomizes the liquid, and ejects the liquid toward an object,
the body includes a second air passage to which second air is supplied;
a mixing chamber having a circular peripheral wall surface when viewed from the opening direction of the first air ejection port and the liquid ejection port, and a bottom surface on which the liquid ejection port and the first air ejection port open, and being exposed to the outside of the body for mixing the first air ejected from the first air ejection port and the liquid ejected from the liquid ejection port;
a second air discharge port disposed at the downstream end of the second air passage, opening into the mixing chamber outside the first air discharge port in the radial direction of the mixing chamber, and discharging the second air into the mixing chamber to form a swirling flow of the second air;
A nozzle device. In the nozzle device according to claim 1,
The nozzle device, wherein the peripheral wall surface of the mixing chamber increases in diameter from the bottom surface toward the discharge direction of the first air and the liquid. In the nozzle device according to claim 1 or 2,
The nozzle device, wherein a plurality of the second air ejection ports are arranged along the peripheral wall surface. In the nozzle device according to any one of claims 1 to 3,
The nozzle device, wherein the second air passage is connected in a tangential direction to the peripheral wall surface. In the nozzle device according to any one of claims 1 to 4,
A nozzle device comprising a liquid diffusing portion that faces the liquid ejection port in the mixing chamber and diffuses the liquid ejected from the liquid ejection port radially outward from the center of the opening of the liquid ejection port. In the nozzle device according to claim 5,
The nozzle device, wherein the liquid diffusion portion has a conical surface that faces the liquid ejection port and tapers toward the liquid ejection port. In the nozzle device according to any one of claims 1 to 6,
The first air is supplied from a first air supply source to the first air passage, and the second air is supplied to the second air passage from a second air supply source different from the first air supply source.

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