JP5596315B2 - Nozzle of aerosol device - Google Patents

Description

  The present invention relates to a nozzle of an aerosol device. More specifically, the present invention relates to an aerosol nozzle capable of spraying with a flat and wide angle pattern.

  When a general aerosol product is sprayed, it is sprayed evenly vertically and horizontally, so that the spray pattern is substantially conical. For example, when paper is sprayed at a predetermined distance from the nozzle hole, it adheres in a substantially circular shape. On the other hand, when spraying an insecticide on a screen door or using it for paint spraying, there are cases where it is desired to spray in a square pattern. Conventionally, spray nozzles of various flat patterns used in such a case have been proposed.

  For example, Patent Document 1 provides a pair of columnar protrusions on both sides of an injection hole, restricts the right and left spread of the contents injected by these protrusions, and obtains a vertically long injection pattern. Patent Document 2 proposes a nozzle provided with a pair of eaves faces facing in parallel at an interval approximately equal to the diameter of the opening or twice or less than the diameter of the opening in front of the opening of the injection hole. By spraying this through a narrow gap between a pair of eaves surfaces, a spray pattern with a thin and wide diffusion angle can be obtained.

  Patent Document 3 discloses a flat spray type gas-liquid mixing spray nozzle used for cooling a red hot steel plate or the like, or for spraying a chemical on a crop by replay or the like. This gas-liquid mixing injection nozzle includes a bottomed cylindrical nozzle body having a tapered (substantially spherical) inner bottom surface, and a slit-like orifice is cut from the outside along the nozzle axis to It communicates with the outside. The incision reaches the vicinity of the position where the inner bottom surface of the constriction starts and expands at an angle of 180 degrees. In general, such nozzles have a large spray amount at three locations, the center and both ends. In Patent Document 3, a substantially spherical inner bottom surface is formed in a two-tiered state to achieve a uniform spray amount.

  The nozzle of Patent Document 4 is a nozzle of an aerosol device that is almost the same as the nozzle of Patent Document 3, but the slit cutting depth is considerably reduced. Thereby, the opening by the cut has an angle (contact angle) of about 90 degrees with respect to the center of the inner bottom surface (outflow tip portion) of the hemispherical or semi-cylindrical shape. Thereby, the spread of the injection angle can be set in a desired range. Patent Document 5 proposes that the outer surface shape of the tip of the injection nozzle is a spherical surface or the like, and that the depth of the slit groove is decreased from the center to the side end, thereby achieving a uniform injection amount. ing.

JP 2004-113993 A Japanese Utility Model Publication No. 42-9484 Japanese Patent Laid-Open No. 61-161162 JP 2001-205145 A JP 2006-320775 A

  When a slit is formed at the tip of the nozzle to obtain a spray pattern that is thin and spreads and has a large angle, the spray rate is particularly high at the center, so the spray amount is particularly large. In addition, the spray amount at both ends is relatively large, and the spray amount is small between the central portion and both ends. Therefore, when an insecticide or the like is sprayed in the air, a difference in density occurs in the spray amount, and the concentration may be partially increased. An object of the present invention is to provide a nozzle of an aerosol device that is thin, can be sprayed at a wide angle, and can make the spray amount more uniform than a conventional product.

The nozzle of the aerosol device of the present invention includes a passage through which contents are passed, a tapered taper portion provided near the tip of the passage, a small-diameter nozzle hole passage extending from the tip of the taper portion, and an opening of the nozzle passage A slit passage cut into a wall surrounding the nozzle hole so as to communicate the nozzle hole which is the end and the external space, the width of the slit passage is smaller than the inner diameter of the nozzle hole, The portion where the nozzle hole overlaps is an opening communicating with the slit passage and the nozzle hole passage, and the nozzle hole is closed except for the opening,
It is characterized in that it extends into the slit passage extension of the inner surface of the tapered portion through said opening (claim 1).

Further, the bottom surface of said slit passage may be those that are cut deeper than the bottom face of the injection hole passage (claim 2).

  In the nozzle of the aerosol device of the present invention (Claim 1), the content ejected through the passage is once narrowed by the taper portion, and is thinly stretched in the slit passage when passing through the nozzle hole passage and exiting from the nozzle hole. It spreads at a large angle. At that time, the contents that have traveled along the inner surface of the tapered portion proceed straight after entering the nozzle hole passage, and intersect just before the nozzle hole without colliding with the inner wall of the nozzle hole passage. Progresses while spreading. Then, the contents that have entered the slit passage spread in the extending direction of the inner surface of the tapered portion as it is. On the other hand, the contents that collide with the wall constituting the slit passage proceed along the wall thereafter.

As described above, in the nozzle of the present invention, the nozzle hole acts as if it is the focal point of a convex lens, and after the contents converge at the tapered portion, the contents expand in the extending direction. Thus even if the speed of the contents to be sprayed is not so fast, thus the flow rate to pass through the injection hole passage from the tapered portion we become fast, smooth in a wide range, and spreads thinly. As a result, the flow rate of the contents does not increase particularly at the center of the spray pattern, and the flow rate does not increase at the peripheral portion. The content particles are sprayed in a flat and wide-angle pattern in which the particles are distributed almost uniformly.

  In the nozzle of the present invention, the contents injected into the atmosphere do not spread straight at the peripheral edge but proceed while converging somewhat toward the center side in an arc shape or a parabolic shape. Although not necessarily clear, it is considered that the flow rate of the central portion, the peripheral portion, and other portions is substantially uniformed by such an action.

Further, the smaller than the inner diameter width of the injection hole of the slit passage, since the injection hole is closed by a pair of walls opposed to constitute the slit passage, contents crossed immediately before the injection hole is a slit passage Easy to spread. Further, the interval between the slit passages can be reduced without changing the diameter of the nozzle hole. Therefore, the angle of the inner surface of the tapered portion can be set relatively freely without worrying about the diameter of the nozzle hole. Therefore, the degree of freedom in design is high.

When the bottom surface of the slit passage is cut deeper than the bottom surface of the nozzle hole passage (Claim 2), adjustment such as shortening the length of the nozzle hole passage can be performed at a portion corresponding to the slit passage. Therefore, the degree of freedom in designing the inner surface angle of the tapered portion can be increased without impairing the convex lens action at the nozzle hole.

It is a section side view showing one embodiment of the nozzle of the present invention. 2a and 2b are a sectional plan view and a front view, respectively, of the nozzle of FIG. It is a partial cross section perspective view which shows the state before the assembly of the operation member provided with the nozzle of FIG. It is a partial cross section perspective view after the operation member is assembled. It is the whole perspective view after the assembly of the operation member. It is a perspective view which shows the use condition of the aerosol apparatus provided with the nozzle of this invention. It is sectional drawing which shows other embodiment of the operation member provided with the nozzle of this invention.

  The nozzle 10 shown in FIGS. 1, 2a and 2b is for an aerosol device, and is used by being attached to a push button 11 together with a spacer 12, as shown in FIG. The nozzle 10 has a substantially disk shape, and a fitting projection 13 that fits the push button or the spacer 12 protrudes on the back surface (left side in FIG. 1). A small protrusion 15 for forming the slit passage 14 protrudes from the front surface (right side in FIG. 1).

Inside the nozzle 10, a substantially cylindrical passage 16 for passing contents, a tapered taper portion 17 provided at the tip of the passage 16, and a small-diameter nozzle hole passage 18 extending from the tip of the taper portion 17. And the slit passage 14 that communicates the nozzle hole, which is the opening end of the nozzle hole passage, with the external space. The passage 16, the tapered portion 17, the nozzle hole passage 18, and the slit passage 14 are cavities or spaces formed in the object constituting the nozzle 10. The tapered portion 17 has a truncated cone shape, and the nozzle hole passage 18 has a cylindrical shape. In addition, you may provide a processus | protrusion and a groove | channel on the inner surface of the taper part 17, and may control the flow of the content. In this embodiment, the slit passage 14 is vertically oriented, the front side is open to the external space at the front surface of the small protrusion 15, and the upper and lower ends are open at the outer peripheral surface of the small protrusion 15. Thus, the small protrusion 15 defines the range of the slit passage 14, particularly the length Ls.

  As shown in FIG. 2 a, the sectional shape of the slit passage 14 is substantially rectangular, and the depth Dp is 1.5 to 5 times the width B. If it is less than 1.5 times, it is difficult to obtain the effect of increasing the angle of the spray pattern by the slit passage, and if it is more than 5 times, the amount of contents flowing along the slit passage 14 increases and the concentration at both ends becomes high. Cheap. The bottom surface 14a of the slit passage 14 is flat as shown in FIG. The width B of the slit passage 14 is 0.1 to 1 mm, and the depth is about 0.3 to 3 mm. In this embodiment, the width B and the depth Dp of the slit passage 14 are substantially constant. The passage 16 is open on the rear side in order to communicate with the aerosol container body via a push button or a spacer. The diameter df of the nozzle hole passage 18 is considerably smaller than the inner diameter dt of the passage 16, and df / dt = 0.1 to 0.5. The diameter df of the nozzle hole is larger than the width B of the slit passage 14. Therefore, the nozzle hole is closed by the bottom portion 19 except for the slit passage 14. In this embodiment, most of the nozzle hole passage 18 is formed in the small protrusion 15. The bottom surface 14a of the slit passage 14 and the bottom surface (injection hole) 18a of the injection hole passage are flush with each other. A portion of the bottom surface 14a of the slit passage 14 that overlaps the nozzle hole is an opening 18b that is opened to the outside through the slit passage 14 as shown in FIG. 2b.

  As shown in FIGS. 1 and 2, the extension line P on the inner surface of the tapered portion 17 passes through the nozzle hole passage 18 and intersects immediately before the nozzle hole. Therefore, the content flowing through the passage (aerosol composition) that flows in the vicinity of the inner wall of the passage converges along the taper portion and merges with the content that flows through the center of the passage, and the inside of the nozzle hole passage 18. To increase the flow rate. Then, it enters the slit passage 14 while expanding from just before the slit passage 14, smoothly spreads in the longitudinal direction of the slit passage 14, and is discharged in a flat and elongated spray pattern.

  As shown in an enlarged view in FIG. 1, the inner diameter dt of the passage 16 is about 1 to 5 mm, preferably about 2 to 4 mm. When the inner diameter of the passage is larger than the range, the spray amount per unit time is large, and a suspension phenomenon occurs in which spraying continues even after the spray operation is stopped, and the spray amount increases against the consumer's intention. On the other hand, when the inner diameter of the passage is smaller than the range, the spray amount per unit time is reduced and it is impossible to inject at a wide angle. The length L1 of the passage 16 is about 5 to 50 mm, more preferably about 10 to 40 mm. If it is too long, a suspension phenomenon that spraying continues even after stopping the spraying operation is likely to occur, and if it is too short, the contents flowing from the stem fitting hole described later collide with the upper end and change the direction at right angles. It does not flow stably in the same direction, and it becomes difficult to obtain the action of the tapered portion.

  The inner diameter df of the nozzle hole passage 18 is about 0.3 to 1.5 mm. If it is too thick, it is opened to the outside with insufficient convergence by the taper portion, so that a difference in the concentration of the spray is likely to occur, and if it is too thin, it is difficult to spread. The length L2 of the nozzle hole passage 18 is about 0.5 to 3 mm. If the length is too long, the extension line P on the inner surface of the taper portion easily crosses the nozzle hole passage, so that the flow rate of the contents decreases, or it flows only in the same direction as the nozzle hole and does not spread easily. The difference in the concentration of the spray is likely to occur because it is opened to the outside.

The length L3 of the taper portion 17 is about 1 to 5 mm, and the taper angle θ is about 20 to 60 degrees. The length L3 of the taper portion 17 is preferably longer than the length L2 of the nozzle hole passage 18. When the length L3 is short, the expansion of the contents in the nozzle hole passage 18 is suppressed, and the spread of the spray tends to be small. The relationship between the diameter (dt) of the passage, the diameter (df) and length (L2) of the nozzle hole passage, and the length (L3) and angle (θ) of the tapered portion satisfy the following equation (1): Is preferred.
tan (θ / 2) <(dt + df) / (2 × (L2 + L3)) (1)
When this equation (1) is satisfied, the extension line of the inner surface of the tapered portion passes through the inside of the nozzle hole, and can be spread in the slit passage and sprayed at a wide angle. The extension lines facing each other intersect in the nozzle hole passage. Also,
tan (θ / 2) <(dt + B) / (2 × (L2 + L3)) (2)
In this case, since the extension lines of the tapered surfaces intersect each other at a position closer to the injection hole, it becomes easy to flow while expanding in the slit passage, and can be injected at a wide angle. Furthermore, tan (θ / 2) <(dt−B) / (2 × (L2 + L3)) (3)
In this case, the extension lines intersect in the slit passage. In this case, it is possible to inject at a wide angle while the control of the injection direction by the slit passage is less effective.

  The nozzle 10 can be manufactured by injection molding or the like from a thermoplastic resin such as polyacetal or polyamide. As the mold to be molded, the one in which the shaft-like members forming the passage 16, the tapered portion 17 and the nozzle hole passage 18 protrude from the inner surface of the mold forming the back surface of the nozzle is used. Further, as the plate-like member forming the slit passage 14, one protruding from the inner surface of the mold forming the front surface is used. And at the time of shaping | molding, a shaft-shaped member and a plate-shaped member contact | abut, and the cavity which connects is formed.

  As shown in FIGS. 3 to 5, the nozzle 10 configured as described above is attached to the push button 11 via the spacer 12 and becomes the operation member 20 of the aerosol device as a whole. In this embodiment, the spacer 12 is a columnar member, and includes a passage 21 communicating with the passage 16 of the nozzle 10 at the center and a recess 22 into which the fitting projection 13 of the nozzle is fitted. From the rear end of the spacer 12, a fitting protrusion 23 that fits the push button 11 protrudes. A recess 24 into which the fitting protrusion 23 of the spacer 12 is fitted is formed on the front surface of the push button 11, and a discharge passage 25 communicating with the passage 21 of the spacer 12 is opened at the center thereof. A stem fitting hole 26 for fitting with the stem of the aerosol valve is opened on the bottom surface. The discharge passage 25 and the passage 27 extending upward from the stem fitting hole 26 are arranged in an L shape and communicate with each other, as in a conventionally known push button.

  The nozzle 10, the spacer 12, and the push button 11 are assembled into the operation member 20 as shown in FIGS. 4 and 5. In this embodiment, the slit passage 14 of the nozzle 10 is oriented vertically. Although not shown, the nozzle 10 and the spacer 12, and the spacer 12 and the push button 11 are elastically engaged with the protrusions formed on the outer periphery of the fitting protrusions 12 and 23 in the annular grooves formed in the recesses 22 and 24, respectively. It can be configured to be detachable and to be able to freely change the angle around the axis by combining them. However, the nozzle 10 and the spacer 12 can be integrally formed, or the spacer 12 and the push button 11 can be integrally formed.

  FIG. 6 shows an aerosol product 30 using the operation member 20 of FIG. The aerosol product 30 includes a cylindrical container body 31, an aerosol valve 32 attached to the upper end of the aerosol product 30, an operation member 20 fitted to the stem of the aerosol valve, and an aerosol composition filled in the container body 31. . As the container main body 31, the aerosol valve 32 and the aerosol composition excluding the operation member 20, all known ones can be used. The aerosol composition filled in the container body 31 includes a stock solution obtained by adding an active ingredient such as a deodorant ingredient, a fragrance, an insecticide ingredient, and a pest repellent ingredient to a solvent such as ethanol, purified water, and kerosene, a liquefied petroleum gas, It is preferable to employ a propellant such as dimethyl ether which contains 30 to 80% by weight of the propellant in the aerosol composition so that the effect of the nozzle of the present invention can be easily obtained and sprayed in a wide-angle mist.

  The operation method is the same as that of a normal aerosol product, and the container body 31 is held by hand, and the upper end of the push button 11 is pushed down with an index finger. Thereby, the aerosol composition enters the stem fitting hole 26 of the push button 11 through the stem, and further enters the passage 16 of the nozzle 10 through the discharge passage 25 and the spacer 12.

  Then, the aerosol composition is ejected from the opening 18 b into the slit passage 14 through the tapered portion 17 and the nozzle hole passage 18. And it spreads in the longitudinal direction in the slit channel | path 14, and is injected in a long pattern up and down thinly. Since the spray M is expanded vertically by the slit passage 14, the expansion angle θr is about 90 to 130 degrees, which is wider than the taper angle of the taper portion 17 of the nozzle 10 (θ in FIG. 1). Further, the upper edge Mu and the lower edge Md of the spray M are curved in an arc shape so as to approach the center side as it advances forward. This arc preferably has a radius of curvature r of about 5 to 15 cm, for example, and the distribution of the injected fine particles becomes uniform. Then, as shown in FIG. 6, if the container body 31 that is gripped while spraying the aerosol composition by pushing the push button 11 is shaken to the left and right, it can be sprayed almost uniformly in a wide space such as a room.

  The shapes of the upper edge Mu and the lower edge Md vary depending on various conditions such as the spray speed, the pressure difference between the inside and outside of the aerosol container, the inner diameter of the nozzle hole, the squeeze rate, the viscosity of the aerosol composition, the surface tension, and the like. For example, if the spraying speed increases, it becomes closer to a straight line. Therefore, appropriate conditions are selected according to the aerosol composition to be injected.

In the nozzle 10, such as Figure 1, but the bottom surface 18a of the bottom surface 14a and the nozzle hole passage 18 of the slit passage 14 is flush, cut deep bottom 14a of the slits passage 14 from the bottom surface 18a of the injection hole passages 18 You may do it. In that case, the length of the nozzle hole passage becomes somewhat shorter at the portion corresponding to the slit passage. Therefore, the design freedom of the inner surface angle of the tapered portion can be increased without impairing the convex lens action in the nozzle hole passage.

  Moreover, although the inner wall surface of the slit channel | path 14 is parallel, you may make an angle so that it may expand toward an outer side. In that case, the angle is preferably about 5 to 30 degrees. In the above embodiment, the nozzle 10 and the spacer 12 are made of synthetic resin, but may be formed of metal.

  The spacer 12 shown in FIG. 3 or the like is for arranging the nozzle hole forward so as to prevent the lower edge Md of the spray having a long vertical pattern from hitting the container body 31 as shown in FIG. However, when the container body 31 is thin or the push button is high, the spacer 12 can be omitted as in the operation member 33 shown in FIG. The operation member 33 is obtained by directly attaching the nozzle 10 to the push button 11. Compared with the operation member 20 of FIG. 3, the fitting projection 13 of the nozzle is lengthened and the concave portion 24 of the push button 11 is deepened. When the operation member 33 of FIG. 7 is also attached to the stem of the valve of the aerosol device, it can be sprayed in a spray pattern that is elongated vertically and thin to the left and right, like the aerosol product 30 of FIG.

DESCRIPTION OF SYMBOLS 10 Nozzle 11 Push button 12 Spacer 13 Fitting protrusion 14 Slit passage 14a Bottom face 15 of slit passage 16 Small protrusion 16 Passage 17 Tapered portion 18 Injection hole passage Ls Length of slit passage Dp Depth of slit passage df Diameter L2 of injection hole passage Length of injection hole passage dt Inner diameter L1 of passage L Length of passage B Width of slit passage 18a Bottom face of injection hole passage (injection hole)
18b Opening P (from nozzle hole to slit passage) Extension line L3 of taper portion Taper angle 19 Taper angle 19 Bottom portion 20 Operating member 21 Passage 22 Recess 23 Fitting protrusion 24 Recess 25 Discharge passage 26 Stem fitting hole 27 Passage 30 Aerosol product 31 Container body 32 Aerosol valve 33 Operating member θr Spray spread angle M Spray Mu Spray upper edge Md Spray lower edge

Claims (2)

A passage through which the contents pass, a tapered portion provided near the tip of the passage, a small-diameter nozzle hole passage extending from the tip of the taper portion, a nozzle hole that is the opening end of the nozzle hole passage, and an external space And a slit passage cut into the wall surrounding the nozzle hole ,
A portion where the width of the slit passage is smaller than the inner diameter of the nozzle hole and the bottom surface of the slit passage overlaps with the nozzle hole is an opening that connects the slit passage and the nozzle hole passage, and the nozzle hole is blocked except for the opening. And
It extends into the slit passage extension of the inner surface of the tapered portion through said opening,
Nozzle for aerosol device. The nozzle of the aerosol device of the bottom surface of the slit passages placing claim 1 Symbol are cut deeper than the bottom surface of the injection hole passage.

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