JP2010163182A - Nozzle chip and aerosol jet device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a nozzle chip and an aerosol jet device which control the generation of a wind pressure caused by the gasification of a spray and jet out an aerosol composite farther for sufficiently and effectively killing a small target pest. <P>SOLUTION: This nozzle chip 100 used for an aerosol jet device 10 is provided with a jetting opening 120, an introduction opening 130 to which an aerosol composite to be jetted out from the opening 120 is introduced, an inside channel 140 which guides the aerosol composite introduced to the opening 130 to the opening 120 side and an expanded space 150 provided between the channel 140 and the opening 120. The space 150 is provided with an expanding inside wall part 151 made of a curved face whose cross section area in the flow channel direction of the aerosol composite gradually increases toward the opening 120 side from the channel 140 side and with a contracting inside wall part 152 made of a curved face whose cross section area gradually decreases toward the opening 120 in the flow direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a nozzle tip used in an aerosol injection device for injecting an aerosol composition, and an aerosol injection device using the nozzle tip.

  There is known an aerosol spraying apparatus that can spray an insecticide or an agricultural chemical as an aerosol (see, for example, Patent Document 1). The conventional injection device has a structure in which an operation valve in which a button having an injection port or a trigger button is fitted is provided on an upper part of an aerosol container containing an aerosol composition made up of a stock solution and a propellant.

  In the aerosol injection device having such a structure, a mist-like aerosol composition is injected from the injection port by the pressure of a propellant such as liquefied petroleum gas (LPG) or dimethyl ether (DME) by operating a trigger or a button. There are also known methods for adjusting the directivity and diffusibility of the aerosol composition to be injected by adjusting the size of the diameter of the injection port or attaching a straight nozzle to the tip of the injection port.

JP 2004-313939 A

  In a conventional aerosol injection device, when an aerosol composition, which is a mixture of a propellant and a stock solution, is jetted to the outside, the propellant is vaporized outside, and accordingly, the stock solution is dispersed in a mist form. At this time, a strong wind pressure is generated by the momentum of the vaporized propellant. As a result, when the aerosol composition is sprayed on small target pests such as fruit flies and mosquitoes, the target pests are blown away by wind pressure due to vaporization of the propellant before the aerosol composition sufficiently adheres to the target pests, Insecticidal efficacy could not be obtained. Moreover, if the wind pressure by a propellant was made small so that a target pest would not blow off, the spray distance of the aerosol composition also became short in connection with it, and sufficient insecticidal effect was not acquired.

  A first aspect of the present invention made to solve the above-described problem is a nozzle tip used in an aerosol injection device for injecting an aerosol composition, the injection tip, and the jet injected from the injection port An introduction port through which an aerosol composition is introduced, an internal passage for guiding the aerosol composition introduced into the introduction port toward the injection port, and an expansion space provided between the internal passage and the injection port The expansion space includes an expansion inner wall portion formed by a curved surface such that a cross-sectional area of the aerosol composition in a flow path direction gradually increases from the internal passage side toward the injection port side, and the flow It has a contraction inner wall part formed by the curved surface which the said cross-sectional area becomes small gradually toward the said injection port in a road direction. In the nozzle tip, it is preferable that the curved surface forming the contraction inner wall portion includes a curved surface obtained by rotating an arc around an axis passing through the center of the injection port and parallel to the flow path direction.

  According to the aerosol injection apparatus using such a nozzle tip, it is possible to inject the aerosol composition farther while suppressing generation of wind pressure due to vaporization of the propellant. Therefore, a sufficient insecticidal effect can be obtained even for small target pests such as ants, fruit flies or mosquitoes.

  According to a second aspect of the present invention, there is provided an aerosol injection device for injecting an aerosol composition, comprising an aerosol container for containing the aerosol composition, and a nozzle tip having an injection port, wherein the aerosol container An injection button for injecting the aerosol composition from the injection port to the outside, and the nozzle tip is introduced into the introduction port for introducing the aerosol composition injected from the injection port, An internal passage for guiding the aerosol composition to the injection port side, and an expansion space provided between the internal passage and the injection port, wherein the expansion space is in the flow direction of the aerosol composition An expanded inner wall portion formed by a curved surface such that the cross-sectional area gradually increases from the inner passage side toward the injection port side, and the jet in the flow direction. And having the contraction inner wall cross-sectional area is formed by gradually becomes smaller such curved surfaces toward the mouth.

  According to such an aerosol injection device, the aerosol composition can be injected farther while suppressing the generation of wind pressure due to vaporization of the propellant. Therefore, a sufficient insecticidal effect can be obtained even for small target pests such as fly flies and mosquitoes. Such excellent effects are considered to be produced for the following reasons.

  That is, in the conventional aerosol apparatus, the aerosol composition in the container reaches the injection port through the flow path in the valve and the button in a liquid state. Here, the aerosol composition that has reached the nozzle is in the state of a mixed liquid of the stock solution and the propellant. When the aerosol composition in such a state is ejected from the nozzle, the propellant is rapidly vaporized, and an airflow is generated in the direction in which the propellant flies.

  On the other hand, in the aerosol injection device according to the present invention, by having the expansion space inside the injection hole, the propellant is vaporized in the expansion space before being injected from the injection hole. Therefore, when the propellant is injected from the nozzle, only a part of the propellant that has not been vaporized in the expansion space is vaporized, so that the generation of airflow is suppressed.

  Moreover, since the gas generated by vaporizing the propellant in the expansion space has a reduced momentum in the injection direction, it is easy to diffuse around when it is injected from the injection port. Therefore, the generation of airflow in the injection direction by the gas generated in the expansion space can be suppressed.

  Moreover, when the stock solution of the aerosol composition is ejected from the nozzle, it is finely crushed into particles. The undiluted stock solution is gradually stalled due to air resistance and finally falls. Therefore, the stock solution flies farther as the velocity when ejected as particles from the nozzle is higher.

  Therefore, in the aerosol injection device according to the present invention, since the inner wall of the expansion space provided inside the nozzle hole has a shape that smoothly converges to the nozzle hole, for example, a conventional product in which a cornered space is provided inside the nozzle hole As compared with the above, the flow rate is less likely to decrease while the stock solution is sent from the internal passage to the nozzle. Therefore, in the aerosol injection device of the present invention, the speed of the stock solution ejected as particles from the nozzle is faster than that of the conventional product, and the stock solution can be blown farther.

The whole figure of aerosol injection device 10 concerning the embodiment of the present invention is shown. Sectional drawing which expanded the injection button 21 vicinity of the aerosol injection apparatus 10 is shown. Sectional drawing of the injection button 21 vicinity in the state by which the trigger part 34 was operated is shown. An enlarged cross-sectional view of the nozzle tip 100 is shown. The conceptual diagram for demonstrating the shape of the expansion inner wall part 151 and the shrinkage | contraction inner wall part 152 is shown. A sectional view of an A type nozzle tip is shown. A sectional view of a B type nozzle tip is shown. A sectional view of a P-type nozzle tip is shown. A sectional view of a Q type nozzle tip is shown. The coloring state of the filter paper colored in the test of Test Example 3 is shown. The coloring state of the filter paper colored in the test of Test Example 3 is shown. The coloring state of the filter paper colored in the test of Test Example 3 is shown. The coloring state of the filter paper colored in the test of Test Example 3 is shown. The coloring state of the filter paper colored in the test of Test Example 3 is shown. The coloring state of the filter paper colored in the test of Test Example 3 is shown.

  Hereinafter, the present invention will be described through embodiments of the present invention, but the following embodiments do not limit the present invention.

  FIG. 1 shows an overall view of an aerosol injection device 10 according to an embodiment of the present invention. As shown in FIG. 1, the aerosol injection device 10 includes an aerosol container 20 that stores an aerosol composition, and a trigger type injection button 21. The injection button 21 includes an operation unit 30 and a flat dome-shaped cover unit 40 that covers the upper and side portions of the operation unit 30.

  FIG. 2 shows an enlarged cross-sectional view of the vicinity of the injection button 21 of the aerosol injection device 10. As shown in FIGS. 1 and 2, the operation unit 30 includes a mounting plate 32, a support unit 33 formed at the rear end of the mounting plate 32, a trigger unit 34 used for operating the operation unit 30, and the nozzle tip 100. And a communication passage 36 communicating with an opening provided in the nozzle tip attachment portion 37.

  In addition, a stem fitting hole 35 that communicates with the nozzle tip mounting portion 37 through the communication path 36 is formed in the lower portion of the operation portion 30. A valve stem 50 that protrudes from the top of the aerosol container 20 is inserted into the stem fitting hole 35. Note that reference numeral 41 in FIG. 2 denotes a holding rib of the cover portion 40 that rotatably holds the support portion 33 in order to support the operation portion 30 in a swingable manner.

  The virgin tab portion 60 temporarily fixes the operation portion 30 to the cover portion 40, and plays a role of preventing the operation portion 30 from being inadvertently erroneously operated, for example, during storage or transportation. When using the aerosol injection device 10, the virgin tab portion 60 is removed from the injection button 21, and then the valve stem 50 is inserted into the stem fitting hole 35 of the operation portion 30, thereby enabling the use. Then, when the valve stem 50 is pressed by the operation unit 30, the aerosol composition in the aerosol container 20 is ejected from the valve stem 50.

  FIG. 3 is a cross-sectional view of the vicinity of the injection button 21 in a state where the trigger unit 34 is operated. When injecting the aerosol composition, as shown in FIG. 3, pull the trigger part 34 of the operation part 30 to the aerosol container 20 side (the direction indicated by the arrow with “X” in FIG. 3) with a finger. The operation unit 30 is swung toward the aerosol container 20 side. As a result, the valve stem 50 is pushed down and pushed into the aerosol container 20, and the aerosol composition in the aerosol container 20 is jetted from the nozzle tip 100 to the outside through the communication path 36.

  FIG. 4 shows an enlarged cross-sectional view of the nozzle tip 100. As shown in FIG. 4, the nozzle chip 100 has a fitting surface 111 that is fitted to the nozzle chip mounting portion 37, and an injection surface 112 in which a circular injection port 120 is formed at the center. In addition, an inlet 130 into which an aerosol composition injected from the injection port 120 is introduced is formed on the end surface of the nozzle chip 100 facing the injection surface 112.

  Further, inside the nozzle tip 100, a cylindrical internal passage 140 that guides the aerosol composition introduced into the introduction port 130 toward the injection port 120, and an extension provided between the internal passage 140 and the injection port 120. A space 150 is formed. In the nozzle tip 100 of this example, the expansion space 150 is formed in the vicinity of the injection port 120 inside the nozzle tip 100.

  In addition, as shown in FIG. 4, the expansion space 150 includes an expansion inner wall portion 151 on the internal passage 140 side and a contraction inner wall portion 152 that is formed continuously with the expansion inner wall portion 151 on the injection port 120 side. The expanded inner wall portion 151 has a cross-sectional area in the flow direction of the aerosol composition (direction indicated by an arrow with “L” in FIG. 4), that is, a surface (cross section) orthogonal to the flow direction in the expanded space 150. The area is configured by a curved surface that gradually increases from the inner passage 140 side toward the injection port 120 side. In addition, the contraction inner wall portion 152 is configured by a curved surface in which the cross-sectional area gradually decreases toward the injection port 120 in the flow path direction.

  FIG. 5 is a conceptual diagram for explaining the shapes of the expanded inner wall portion 151 and the contracted inner wall portion 152. As shown in FIG. 5, the extended inner wall portion 151 has an arc around an axis (ax) that passes through the center of the injection port 120 and is parallel to the flow path direction (the direction indicated by the arrow with “L” in FIG. 5). A curved surface (S1) obtained by rotating (ar1) and a curved surface (S2) obtained by rotating an arc (ar2). Further, as shown in FIG. 5, the contraction inner wall portion 152 is configured by a curved surface (S3) obtained by rotating an arc (ar3) around the axis (ax) through the center of the injection port 120. Further, the contracted inner wall portion 152 may be configured by a spherical surface, an elliptical surface, or a parabolic surface instead of this example. In this example, the maximum diameter of the expansion space 150 in the direction orthogonal to the flow path direction is preferably in the range of 2.0 to 3.5 times the diameter of the internal passage 140.

  About the dimension of each part of the nozzle tip 100, the range is illustrated below. That is, the diameter of the injection port 120 is 0.3-2 mm, for example, Preferably it is 0.4-0.6 mm. Moreover, the diameter of the cross section in the said flow path direction of the internal channel 140 is 0.5-3 mm, for example, Preferably it is 1-2 mm. Moreover, the maximum diameter of the cross section in the said flow path direction of the expansion space 150 is 3-8 mm, for example, Preferably it is 3.5-5 mm. Moreover, the space | interval from the injection port 120 to the terminal end (boundary part of the internal channel 140 and the expansion inner wall part 151) of the internal channel 140 is 5-15 mm, for example, Preferably it is 6-9 mm. In addition, the diameter of the arc (ar1) shown in FIG. 5 is 3 to 9 mm, and the diameter of the arcs (ar2, ar3) is 3.5 to 8 mm.

  According to the aerosol injection apparatus 10 provided with such a nozzle tip 100, the aerosol composition can be injected farther while suppressing generation of wind pressure due to vaporization of the propellant. Therefore, a sufficient insecticidal effect can be obtained without blowing off even a small target pest.

  In the present embodiment, the aerosol composition includes a propellant (liquefied gas, compressed gas, etc.) and a stock solution (solvent, insecticide, repellent, fungicide, plant essential oil, deodorant, fragrance, cosmetics, pharmaceuticals. And other solutes).

  In this embodiment, as a propellant for ejecting the aerosol stock solution, dimethyl ether (DME), liquefied petroleum gas (LPG), n-butane, isobutane, propane, isopentane, n-pentane, cyclopentane, propylene, n-butylene, isobutylene , Ethyl ether, carbon dioxide gas, nitrogen gas, and chlorofluorocarbon gas (HCFC22, 123, 124, 41b, 142b, 225, HFC125, 134a, 143a, 152a, 12, 227a) that do not cause a problem in use, etc. It can be used as a mixture.

  Examples of the solvent include water, alcohols such as methanol, ethanol, isopropanol, ethylene glycol, diethylene glycol monobutyl ether, and ethylene glycol monomethyl ether, ketones such as acetone, methyl ethyl ketone, and methyl isobutyl ketone, and esters such as acetic acid. Examples include methyl, ethyl acetate, butyl acetate, isopropyl myristate, and other ethyl ethers, and aliphatic hydrocarbons: n-hexane, kerosene, kerosene, n-pentane, isopentane, cyclopentane, and the like. These solvents may be used as a mixture.

Examples of the active ingredient include insecticides, fungicides, acaricides, repellents, fragrances and deodorants.
As an insecticide, it is preferable to use a pyrethroid type compound from the viewpoint of safety, and typical examples are as follows.
・ Allethrin ・ Pinaminforte ・ Bioaresulin ・ Exrin ・ Resmethrin ・ Framethrin ・ Plarethrin ・ Terareslin ・ Phthalathin ・ Neopinamine forte ・ Phenothrin ・ Permethrin ・ Cifenotrin ・ Cipermethrin ・ Transfluthrin ・ Metfluthrin ・ Imiprotolin ・ Tromethrin ・ Profluthrin

  Examples of other insecticides include carbamates such as propoxer, oxadiazoles such as methoxadiazone, and organic phosphoruss such as DDVP.

In addition, as a pest repellent,
N, N-diethyl-meta-toluamide (diet)
• 2,3,4,5-bis (Δ2-butylene) -tetrahydrofurfural • di-n-propyl isocincomellonate • di-n-butyl succinate • 2-hydroxyethyloctylsulfide • 2-t- Butyl-4-hydroxyanisole 3-tert-butyl-4-hydroxyanisole 1-ethynyl-2-methyl-pentenyl 2,2,3,3-tetramethylcyclopropanecarboxylate 1-ethynyl-2-methyl- 2-pentenyl 2,2-dimethyl-3- (2 ', 2'-dichlorovinyl) -cyclopropane-1-carboxylate 1-ethynyl-2-methyl-2-pentenyl 2,2-dimethyl-3- (2 '-1'-propiphenyl) -cyclopropane-1-carboxylate, N-hexyl-3,4-dichloromaleimide, etc. And the like.

In addition, as an acaricide,
Phenothrin, permethrin, restmelin, IBTA, IBTE, quaternary ammonium salt, benzyl benzoate, phenyl benzoate, benzyl salicylate, phenyl salicylate, 3-bromo-2,3-iodo-2-propenyl-ethyl carbonate, 4- Examples include chlorophenyl-3-iodopropargyl formal.

  Insect juvenile hormones include juvenile hormones, anti-larvae hormones, molting inhibitory hormones, etc., and typically metoprene, hydroprene, S-hydroprene, pyriproxyfen, phenoxy curve, imidazole (1-methyl) -5- (2,6-dimethyl-1,5-heptadienyl) imidazole, 1-ethyl-5- (2,6-dimethyl-1,5-heptadienyl) imidazole) and the like.

  Moreover, as a disinfectant, para-chloro-metaxylenol (PCMX), 2,4,4'-trichloro-2'-hydroxydiphenyl ether (Irgasan DP-300), 3-iodo-2-propynyl butyl carbamate (Troysan) Etc.

  The plant essential oils include orange oil, terpeneless orange oil, mint oil, eucalyptus oil, citronella oil, geranium oil, d-limonene, L-menthol, 1,8-cineole, cinnamic aldehyde, eugenol, hiba oil, Examples include cinnamon oil and clove oil.

  In addition, as a fragrance, natural fragrances such as scented incense, bergamot oil, cinnamon oil, citronella oil, lemon oil, lemongrass oil, pinene, limonene, linalool, menthol, borneol, eugenol, citral, citronellal, heliotopin, crocodile, etc. Artificial flavors.

Furthermore, examples of the deodorizer include lauryl methacrylate, geranyl crotonate, acetophenone myristate, paramethylacetophenone benzaldehyde, and the like.
In addition, the active ingredient mentioned above can be used individually or in mixture.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

  Hereinafter, the present invention will be specifically described with reference to examples and test examples using the examples. However, the present invention is not limited to the following examples.

  6 and 7 show cross-sectional views of two types of nozzle chips used in the following test examples among the nozzle chips according to the present invention. 8 and 9 are cross-sectional views of a conventional nozzle tip used as a comparative example. Hereinafter, the nozzle tip having the shape shown in FIG. 6 is referred to as “A type”, and the nozzle tip having the shape shown in FIG. 7 is referred to as “B type”. Further, the nozzle tip having the shape shown in FIG. 8 is referred to as “P type”, and the nozzle tip having the shape shown in FIG. 9 is referred to as “Q type”.

  As shown in FIGS. 6 to 9, the nozzle tips of A type, B type, P type, and Q type have the same diameter at the narrowest portion of the injection port. In addition, the A-type nozzle tip differs from the B-type nozzle tip in the shape of the expansion space formed inside. That is, the expansion space of the A-type nozzle tip is shorter in the flow path direction of the expansion space than the expansion space of the B-type nozzle tip, and the curved surfaces of the expansion inner wall portion and the contraction inner wall portion are tight.

  The P-type and Q-type nozzle tips have no expansion space inside the injection port, and an internal passage is formed up to the vicinity of the injection port. The Q-type nozzle tip has a larger internal passage diameter than the P-type nozzle tip, and the internal passage and the injection port are connected at the end of the internal passage.

The following test examples were performed using the nozzle tips described above in an aerosol injection apparatus substantially similar to the aerosol injection apparatus 10 according to the embodiment of the present invention.
(Test Example 1) Wind speed measurement test (1-1) Test method An aerosol injection device using an A-type nozzle tip and an aerosol injection device using a P-type nozzle tip can be used as a wind speed sensor for an anemometer. The test specimen was jetted for 10 seconds and the wind speed at the time of jetting was measured. In addition, since the injection state of the test specimen was not stable at the beginning of injection and the wind speed was unstable, measurement was started 5 seconds after the start of injection. Moreover, since the wind speed at the time of injection was not constant, the maximum value and the minimum value of the wind speed were measured. The above test was performed under different distances from the injection port to the wind speed sensor (25 cm, 50 cm, and 75 cm). Moreover, the capacity | capacitance of the aerosol injection apparatus used for the test is 576 ml, and the stem tap (ST), vapor tap (VT), and under tap (UT) of the valve are as follows.
ST: φ0.5mm
VT: None UT: φ2.0mm
(1-2) Test specimen Aerosol composition: 400 ml of liquefied petroleum gas (LPG3.0)

(1-3) Test results Table 1 shows the measurement results.

  When the distance from the injection port to the wind speed sensor is 25 to 75 cm, the aerosol injection device using the A-type nozzle tip of this embodiment is compared with the aerosol injection device using the P-type nozzle tip of the conventional shape. Maximum wind speed has decreased. Moreover, this tendency became more remarkable as the injection position was closer to the wind speed sensor. Therefore, it became clear from this test result that the wind pressure can be suppressed when the aerosol composition is sprayed by using the nozzle tip according to this example.

(Test Example 2) Injection distance measurement test (1)
(2-1) Test method The following prescriptions were applied to each of an aerosol injection device having a B-type nozzle tip, an aerosol injection device using a P-type nozzle tip, and an aerosol injection device using a Q-type nozzle tip. The test specimen consisting of was sprayed onto the filter paper, and the amount of the insecticidal drug substance adhering to the filter paper was measured. Specifically, first, a test specimen was sprayed for 2 seconds onto a filter paper having a diameter of 110 mm suspended vertically. And after drying with the filter paper suspended, phenothrin was extracted with acetone, and the amount of adhesion to the filter paper was quantified by gas chromatography. The above test was performed under different spray distances by changing the distance from the spray nozzle to the filter paper (spray distance) (50 cm, 75 cm, 100 cm). Moreover, the aerosol injection apparatus used for the test is the same as Test Example 1.
(2-2) Test specimen Stock solution: Phenothrin (active substance) 0.24 g
17.24 ml of ethanol
100 ml of isoparaffin

Aerosol composition: Stock solution 217.5ml
DME 82.5ml

(2-3) Test results Table 2 shows the measurement results. In Table 2, the active ingredient injection amount (mg) and the active ingredient adhesion rate (%) are obtained by the following equations, respectively.
Propellant injection amount (mg) = Aerosol composition injection amount (g) / 1000 × Protocol concentration in aerosol composition (W / W%) / 100
Active substance adhesion rate (%) = Active substance adhesion amount (mg) / Active substance injection amount (mg) x 100

  At the spray distances of 75 cm and 100 cm, the aerosol spray device using the B-type nozzle tip of this example has a higher adherence rate than the aerosol spray device using the conventional P-type nozzle tip. It was. In particular, when the spray distance is 100 cm, the adherence rate of the original material when the B-type nozzle tip is used is about 5 times that of the original material when the P-type nozzle tip is used.

  In addition, at the spray distances of 75 cm and 100 cm, the aerosol spray device using the B-type nozzle tip had a higher rate of adherence of the drug substance than the aerosol spray device using the Q-type nozzle tip. As described above, it was revealed from the test results that the insecticidal active substance can be sprayed farther than the conventional nozzle tip by using the nozzle tip according to the present example.

(Test Example 3) Injection distance measurement test (2)
(3-1) Test method A test specimen containing an oil-soluble dye is jetted toward the filter paper by each of an aerosol jet device provided with an A-type nozzle tip and an aerosol jet device using a P-type nozzle tip. The coloring state of the pigment of the filter paper was measured. Specifically, first, a test specimen was sprayed for 3 seconds onto a filter paper having a diameter of 40 cm suspended vertically. Then, after drying with the filter paper suspended, the horizontally colored region (only the portion where the test sample is concentrated) and the entire colored region (including the portion where the scattered test sample is attached) The length of was measured. The above test was performed under different spray distances by changing the distance from the spray nozzle to the filter paper (spray distance) (50 cm, 75 cm, 100 cm). Moreover, the capacity | capacitance of the aerosol injection apparatus used for the test is 385 ml, and the valve | bulb is the same as the test example 1. FIG.
(3-2) Test specimen Stock solution: Orange oil 1.25g
Oil-soluble pigment (oil red) 0.1g
100 ml of isoparaffin

Aerosol composition: Stock solution 217.5ml
DME 82.5ml

(3-3) Test result FIGS. 10-15 shows the coloring state of the filter paper colored in this test. Here, FIG. 10, FIG. 11, and FIG. 12 show the colored state of the filter paper when the spraying distance is set to 50 cm, 75 cm, and 100 cm using an aerosol spraying device provided with an A-type nozzle tip. . FIG. 13, FIG. 14, and FIG. 15 show the colored state of the filter paper when tested using an aerosol injection device provided with a P-type nozzle tip and setting the injection distance to 50 cm, 75 cm, and 100 cm. Moreover, about the filter paper colored in each test, the length of the horizontal direction of the darkly colored area | region (area | region enclosed with the continuous line of FIGS. 10-15) and all the colored area | regions (area | region enclosed with the broken line of FIGS. 10-15) The results of measuring are shown in Table 3.

  At an injection distance of 100 cm, the aerosol injection device using the A-type nozzle tip of this example has a higher proportion of darkly colored regions than the aerosol injection device using the P-type nozzle tip of the conventional shape. It was. Therefore, it became clear from this test result that by using the nozzle tip according to the present embodiment, it is possible to inject farther while suppressing the dispersion of the stock solution as compared with the conventional nozzle tip.

(Test Example 4) Insecticidal efficacy confirmation test (4-1) Test method Aerosol injection device with B-type nozzle tip, aerosol injection device with P-type nozzle tip, and aerosol with Q-type nozzle tip Each of the spraying devices sprayed the test specimen containing the insecticidal drug substance toward the test insect, and confirmed the effect on the test insect. Moreover, the aerosol injection apparatus used for the test is the same as Test Example 3.

  A cup with a bottom diameter of 130 mm and a height of 100 mm was installed at an angle of 45 °, and five female cockroaches were placed. Then, a test specimen was sprayed onto the cup for 2 seconds from a distance of 100 cm from the bottom surface of the cup. Then, the test insects were transferred to a clean cup, and the number of knockdowns of the test insects was counted every 2 seconds for 120 seconds after jetting. After that, absorbent cotton soaked with water was put in a cup, placed in a thermostatic chamber at 25 ° C., and the test insects that were dead after 24 hours were counted.

  Further, 10 female squids were placed in a cylindrical cage having a bottom diameter of 85 mm and a height of 100 mm, and a test specimen was sprayed onto the cage for 1.5 seconds from a distance of 100 cm from the center of the cage. Then, the number of test insects knocked down was counted every 2 seconds for 120 seconds after injection. Thereafter, the test insects were transferred to a clean cup, and absorbent cotton soaked with water was put into the cup and placed in a thermostatic chamber at 25 ° C. In this state, the test insects that died after 24 hours were counted.

(4-2) Test specimen Stock solution: Phenothrin (active substance) 0.24 g
17.24 ml of ethanol
100 ml of isoparaffin

Aerosol composition: Stock solution 217.5ml
DME 82.5ml

(4-3) Test results Table 4 shows the measurement results. In Table 4, KT50 and KT90 are obtained by the following equations, respectively.
KT50: Time when the knockdown ratio to the total number of test insects reached 50% (average of N = 3)
KT90: Time when the knockdown rate for the total number of test insects reached 90% (average of N = 3)

  The aerosol injection device using the B-type nozzle tip of this example had a higher knockdown effect than the aerosol injection device using the P-type and Q-type nozzle tips of the conventional shape. In addition, when the B-type nozzle tip was used, an excellent effect on the dead rate of the stingray was shown as compared with the case where the conventional nozzle tip was used. Therefore, it was clarified from the test results that by using the nozzle tip according to the present embodiment, it is possible to hit a large amount of the insecticidal active substance against the insecticidal target as compared with the conventional nozzle tip.

(Test Example 5) Blow-off test (5-1) Test method Aerosol injection apparatus using an A-type nozzle chip, aerosol injection apparatus using a B-type nozzle chip, and aerosol injection apparatus using a P-type nozzle chip In each of the above, a test specimen containing the insecticidal active ingredient was sprayed toward the test insect, and the effect on the test insect was confirmed. Moreover, the aerosol injection apparatus used for the test is the same as Test Example 3.

  Place a filter paper with a diameter of 5 cm on the center of a stainless steel floor, and place the test specimen at the angle of 30 ° to the floor from the position about 57 cm away from the ground for 1 second. Jetted. And the distance (blow off distance) from the center of the filter paper to the position where the red snapper blew off was measured. In addition, as for the ants placed on the filter paper, those which had been anesthetized with diethyl ether in advance and were unable to move were used.

(5-2) Test specimen Aerosol composition: liquefied petroleum gas (LPG3.0) 300 ml

(5-3) Test Results Table 5 shows the results of repeating the test by the above method 5 times.

  The aerosol injection device using the A-type and B-type nozzle tips of the present example is less likely to blow off the ants compared to the aerosol injection device using the P-type nozzle tip which is a conventional shape. In the aerosol spray device using the nozzle tip, the suppression effect was remarkable. The reason why the blow-off is suppressed by using the nozzle tip of this embodiment is considered to be as follows. That is, since the nozzle tip of this embodiment has an expansion space inside, a part of the propellant is vaporized in the expansion space before being injected from the injection port. This is thought to be because the generation of wind pressure due to vaporization is suppressed.

  Further, the internal passages of the A-type and B-type nozzle tips are narrower than the communication passage inside the injection button. For this reason, the flow rate of the aerosol composition once increases in the internal passage, and vaporization of the propellant is promoted when the aerosol composition having the increased flow rate flows into the expansion space of the nozzle tip. Therefore, it is considered that the generation of the wind pressure is further suppressed by the nozzle tip of the present embodiment having an internal passage narrower than the communication passage.

DESCRIPTION OF SYMBOLS 10 ... Aerosol injection apparatus 20 ... Aerosol container 21 ... Injection button 30 ... Operation part 32 ... Mounting plate 33 ... Support part 34 ... Trigger part 35 ... Stem fitting hole 36 ... Communication path 37 ... Nozzle tip attachment part 40 ... Cover part 41 ... holding rib 50 ... valve stem 60 ... virgin tab portion 100 ... nozzle tip 111 ... fitting surface 112 ... injection surface 120 ... injection port 130 ... introduction port 140 ... internal passage 150 ... expansion space 151 ... expansion inner wall portion 152 ... contraction inner wall Part

Claims (3)

A nozzle tip used in an aerosol injection device for injecting an aerosol composition,
An injection port,
An inlet through which the aerosol composition injected from the injection port is introduced;
An internal passage for guiding the aerosol composition introduced into the introduction port to the injection port side;
An expansion space provided between the internal passage and the injection port;
With
The expansion space is
An expanded inner wall portion formed by a curved surface such that a cross-sectional area of the aerosol composition in the flow channel direction gradually increases from the internal passage side toward the injection port side; and toward the injection port in the flow channel direction And a shrinkable inner wall portion formed by a curved surface so that the cross-sectional area gradually decreases.   2. The nozzle tip according to claim 1, wherein the curved surface forming the contracted inner wall portion includes a curved surface obtained by rotating an arc around an axis passing through the center of the injection port and parallel to the flow path direction. An aerosol injection device for injecting an aerosol composition,
An aerosol container containing the aerosol composition;
An injection button having a nozzle tip having an injection port, and for injecting the aerosol composition in the aerosol container to the outside from the injection port;
With
The nozzle tip is
An inlet through which the aerosol composition injected from the injection port is introduced;
An internal passage for guiding the aerosol composition introduced into the introduction port to the injection port side;
An expansion space provided between the internal passage and the injection port;
With
The expansion space is
An expanded inner wall portion formed by a curved surface such that a cross-sectional area of the aerosol composition in the flow channel direction gradually increases from the internal passage side toward the injection port side; and toward the injection port in the flow channel direction An aerosol injection device comprising a contracted inner wall portion formed by a curved surface so that the sectional area gradually decreases.

Images