JP2014136687A - Pest control aerosol and its nozzle structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pest control aerosol that is so structured that a plenty of pest action inhibitory agent can be adhered to pests in a liquid state to enhance the effectiveness as well as to prevent backfire phenomenon from occurring, when controlling pest by cooling using the heat of vaporization of the pest action inhibitory agent.SOLUTION: A pest control aerosol 1 including an aerosol can 10 containing pest action inhibitory agent that adheres to pests and cool by heat of vaporization to inhibit the action, and a nozzle 30 to eject a pest action inhibitory agent 100 in aerosol can 10, characterized in that, in the nozzle 30, a channel 32 for pest action inhibitory agent 100 flowed out of aerosol can 10 is so formed to communicate to ejection port 31, and the channel 32 is so structured that the cross section on downstream side of a flow direction of the pest action inhibitory agent 100 is larger compared to that of on upstream side.

Description

  The present invention relates to a pest control aerosol for controlling pests such as cockroaches and an aerosol nozzle structure.

  2. Description of the Related Art Conventionally, a pest control air sole is used in which a pest control agent containing an insecticide is contained in an aerosol can together with a propellant such as liquefied petroleum gas. Since this type of pest control air sole contains an insecticidal solution, there is a situation where it is refrained from being used near kitchens and infants with food and tableware, or not used at all.

  On the other hand, as disclosed in, for example, Patent Document 1, a pest control aerosol containing a pest behavior inhibitor having a spraying action and a cooling action using substitute chlorofluorocarbon as an active ingredient is known. In this aerosol, the sprayed pest behavior inhibitor can be attached to the pest to cool the pest and paralyze or kill it. In the aerosol of Patent Document 1, since substitute chlorofluorocarbon is an active ingredient, it is safe to prevent adverse effects on food, tableware, and infants.

JP 2009-227662 A

  By the way, since the pest control aerosol of Patent Document 1 is made effective by attaching a pest behavior inhibitor to the pest and cooling the pest using the heat of vaporization of the pest behavior inhibitor, the pest behavior is obtained. It is necessary to attach the inhibitor to the pest as much as possible in the liquid state. If this is not possible, the superiority over general aerosol containing insecticide will be lost.

  However, in general, pests often move around quickly. Therefore, even if the user targets the aerosol with the aerosol, operates the aerosol button, and injects the pest behavior inhibitor, a time delay occurs before the button is operated, causing the pest to move away from the injection center. End up. In addition, the user is often intimidated when a pest is found, and it is often difficult to accurately aim with the aerosol. In such a case, since the amount of the pest behavior inhibitor adhering to the pest is reduced, sufficient efficacy cannot be obtained.

  For example, in the case of cockroaches, a pest behavior inhibitor may be sprayed from a certain distance without being accessible by some users. In this case, since the distance between the aerosol injection port and the pest is increased, the amount of evaporation in the atmosphere increases until the sprayed pest behavior inhibitor reaches the pest, and it adheres to the pest in a liquid state. The amount decreases.

  In addition, when the pest behavior inhibitor is flammable, it is necessary to ensure sufficient safety during use. For example, when a pest behavior inhibitor is injected and ignited for some reason, it is necessary to prevent the phenomenon that the fire reaches the aerosol side (user side), that is, the so-called flashback phenomenon.

  The present invention has been made in view of such points, and the object of the present invention is to provide a pest behavior inhibitor in a liquid state when the pest is cooled and exterminated by the heat of vaporization of the pest behavior inhibitor. It is intended to prevent the flashback phenomenon from occurring while increasing the effectiveness by allowing it to adhere to the surface.

  In order to achieve the above object, in the present invention, the jetting speed is increased while increasing the jetted particle size.

The first invention is an aerosol container containing a pest behavior inhibitor that adheres to a pest and cools the pest by vaporization heat to inhibit the behavior;
In the pest control aerosol provided with a nozzle for injecting the pest behavior inhibitor of the aerosol container,
The nozzle is formed such that a flow path of the pest behavior inhibitor that has flowed out of the aerosol container communicates with an injection port.
The flow path has a cross-sectional area on the downstream side in the flow direction of the pest action inhibitor that is set larger than that on the upstream side, and the inner diameter on the upstream side of the flow path is D1, and the inner diameter on the downstream side of the flow path. When D2 is D2, D2 / D1 is set larger than 1.07 and 1.63 or less.

  According to this configuration, the pest behavior inhibitor flowing out from the aerosol container flows through the flow path of the nozzle and is injected from the injection port. The flow path of the nozzle has a narrower cross-sectional area on the upstream side than the downstream side and is in a narrowed state, so that the flow rate of the pest behavior inhibitor flowing through the upstream side of the flow path is increased. When the pest action inhibitor reaches the downstream side of the flow path, the cross-sectional area increases and the flow velocity decreases, and at this time, the particles that have circulated upstream of the flow path are integrated to form large particles. Since the large particles are ejected from the ejection port, the amount of the pest behavior inhibitor adhering to the pest in the liquid state increases. This makes it possible to greatly increase the amount of heat taken away from the pests until the pest behavior inhibitor particles completely evaporate.

  Since the flow velocity of the particles ejected from the ejection port is increased on the upstream side of the flow path of the nozzle as described above, it is sufficiently fast. Therefore, for example, even if the pest behavior inhibitor is ignited during injection, particles are injected faster than the speed at which the flame reaches the injection port, and the flashback phenomenon can be suppressed.

According to a second invention, in the first invention,
The inner diameter of the upstream side of the flow path is set to 1.6 mm or more and 2.6 mm or less,
The inner diameter of the downstream side of the flow path is set to 2.2 mm or more and 3.4 mm or less.

3rd invention is provided in the aerosol container which accommodated the pest, the pest action inhibitor which cools a pest by vaporization heat and stops action, and is provided in the nozzle structure which injects the said pest action inhibitor of this aerosol container ,
The pest behavior inhibitor channel that has flowed out of the aerosol container is formed to communicate with the injection port,
The flow path has a cross-sectional area on the downstream side in the flow direction of the pest action inhibitor that is set larger than that on the upstream side, and the inner diameter on the upstream side of the flow path is D1, and the inner diameter on the downstream side of the flow path. When D2 is D2, D2 / D1 is set larger than 1.07 and 1.63 or less.

  According to this configuration, it is possible to sufficiently increase the flow velocity of particles on the upstream side of the flow path by setting the ratio of the inner diameter on the upstream side of the flow path to the inner diameter on the downstream side as described above. It is possible to promote the generation of large particles on the downstream side of the flow path.

According to a fourth invention, in the third invention,
The inner diameter of the upstream side of the flow path is set to 1.6 mm or more and 2.6 mm or less,
The inner diameter of the downstream side of the flow path is set to 2.2 mm or more and 3.4 mm or less.

  According to this configuration, by setting the inner diameter on the upstream side and the inner diameter on the downstream side of the flow path as described above, the flow velocity of the particles can be sufficiently increased on the upstream side of the flow path. It is possible to promote the generation of large particles downstream of the path.

  According to the present invention, since the flow path of the pest behavior inhibitor is formed in the nozzle and the cross-sectional area on the downstream side of the flow path is set larger than that on the upstream side, large particles can be injected at a sufficient flow rate. . Thereby, it is possible to prevent the flashback phenomenon from occurring while increasing the efficacy by adhering a large amount of the pest behavior inhibitor to the pest in a liquid state.

  Moreover, while being able to fully raise the effect of the action stop of a pest, a backfire phenomenon can be suppressed.

It is a side view of the pest control aerosol according to the embodiment. It is a fragmentary sectional view of the pest control aerosol. It is an expanded sectional view near the nozzle of a head cap. It is a figure which shows the measuring method of cooling performance. It is a top view which shows the arrangement position of the temperature measurement terminal used when measuring cooling performance. It is a figure explaining an efficacy test method. It is a figure explaining the test method which confirms flame length. It is a figure explaining a flashback test method.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

  FIG. 1 is a side view of a pest control aerosol 1 according to an embodiment of the present invention. The pest control aerosol 1 includes an aerosol can (aerosol container) 10 formed of a sealed pressure-resistant can and a head cap 20. The aerosol can 10 can be made of, for example, steel, but may be made of other materials.

  As shown in FIG. 2, a valve 11 is provided on the upper portion of the aerosol can 10. The valve 11 has a well-known structure and includes a stem 12 and a spring 13 that biases the stem 12 upward. When the stem 12 is in the raised position, the discharge port 12a of the stem 12 is closed. On the other hand, when the stem 12 is pushed down against the urging force of the spring 13, the discharge port 12a is opened.

  As shown in FIG. 2, the pest behavior inhibitor 100 is accommodated in the aerosol can 10. The pest behavior inhibitor 100 has a spraying action that is sprayed from the aerosol can 10 and a cooling action that cools the pest when attached to the pest. As the pest behavior inhibitor 100, for example, any one of HFO-1234ze (1,3,3,3-tetrafluoropropene), dimethyl ether (DME) and liquefied petroleum gas (LPG), or of these, It is a mixture of at least two.

  The vapor pressure of HFO-1234ze is 0.50 MPa (25 ° C.), the vapor pressure of dimethyl ether is 0.59 MPa (25 ° C.), and the vapor pressure of liquefied petroleum gas is from 0.29 MPa (25 ° C.) to 0.98 MPa (25 ° C.). The boiling point of HFO-1234ze is -19.0 ° C, the boiling point of dimethyl ether is -24.8 ° C, and the boiling point of liquefied petroleum gas is -42.1 ° C to -0.5 ° C. . That is, the vapor pressure of the pest action inhibitor 100 is in the range of 0.29 MPa (25 ° C.) to 0.98 MPa (25 ° C.), and the boiling point is in the range of −50 ° C. to 0 ° C.

  In this embodiment, the side on which the pest behavior inhibitor 100 is injected is referred to as a front side, and the opposite side is referred to as a rear side.

  The head cap 20 includes a cap body 21 and an operation unit 22 operated by a user. The cap body 21 is formed so as to cover the upper portion of the aerosol can 10 and is fixed to the upper portion. The operation unit 22 is integrally formed with the cap body 21. A thin portion 23 is formed at the front end portion of the operation portion 22, and the thin portion 23 is connected to the cap body 21. Therefore, the operation unit 22 swings up and down on the rear side with the vicinity of the front end portion as a fulcrum.

  On the rear side of the operation unit 22, a pressing unit 24 on which a user puts a finger is formed. Between the pressing portion 24 and the thin portion 23 of the operation portion 22, a hollow protruding portion 26 that protrudes upward is formed. A communication passage 27 that communicates with the discharge port 12 a of the stem 12 is formed inside the protruding portion 26. The communication path 27 extends in the vertical direction so that the pest behavior inhibitor 100 circulates. A cylindrical portion 28 that protrudes downward is formed at the peripheral edge of the lower end portion of the communication passage 27. The upper portion of the stem 12 is fitted inside the cylindrical portion 28. The upper part of the communication path 27 extends upward from the pressing part 24.

  A nozzle 30 is formed integrally with the middle portion of the protruding portion 26 in the vertical direction. The nozzle 30 extends linearly toward the front and is substantially perpendicular to the communication path 27. A substantially circular injection port 31 is formed at the tip of the nozzle 30. Inside the nozzle 30, a flow path 32 through which the pest behavior inhibitor 100 flows is formed in a straight line. The flow path 32 includes an upstream portion 32a on the upstream side in the flow direction of the pest behavior inhibitor 100 and a downstream portion 32b on the downstream side. The cross-sectional shapes of the upstream portion 32a and the downstream portion 32b are both circular. The upstream portion 32a has the same cross-sectional shape from the upstream end to the downstream end, and the downstream portion 23b also has the same cross-sectional shape from the upstream end to the downstream end. The downstream end of the downstream portion 32 b communicates with the injection port 31. The shape and size of the injection port 31 are the same as the cross-sectional shape of the downstream end of the downstream portion 32b.

  The cross-sectional area of the downstream portion 32b is set larger than that of the upstream portion 32a. Correspondingly, a stepped portion 34 is formed on the inner surface of the flow path 32 at the boundary between the upstream portion 32a and the downstream portion 32b. Further, the center line of the upstream portion 32a coincides with the center line of the downstream portion 32b.

  In this embodiment, the relative relationship between the inner diameter D1 (shown in FIG. 3) of the upstream portion 32a of the flow path 32 and the inner diameter D2 of the downstream portion 32b of the flow path 32 is such that D2 / D1 is larger than 1.07. .63 or less. Further, the inner diameter D1 of the upstream portion 32a of the flow path 32 is set to 1.6 mm or more and 2.6 mm or less. Further, the inner diameter D2 of the downstream portion 32b of the flow path 32 is set to 2.2 mm or more and 3.4 mm or less.

  By setting the inner diameter D1 of the upstream portion 32a and the inner diameter D2 of the downstream portion 32b as described above, the upstream side of the flow channel 32 is narrowed, while the downstream side is opened compared to the upstream side. Will be. Therefore, the flow path 32 has a two-stage structure in which the cross-sectional area changes stepwise in the middle.

  Further, the length L1 of the upstream portion 32a of the flow path 32 is set to 5 mm or more. The length L2 of the downstream portion 32b of the flow path 32 is set to 10 mm or more. Note that the value of L1 / L2 only needs to satisfy the above-described conditions, and can be set to an arbitrary value. Further, the length (L1 + L2) of the flow path 32 is preferably 20 mm or more. Considering practicality, the length of the flow path 32 is preferably, for example, 200 mm or less.

  When the pest control aerosol 1 configured as described above is used, the pressing portion 24 is pressed in a state where the injection port 31 of the head cap 20 is directed to the target pest. Then, the operation unit 22 swings downward and pushes down the stem 12 of the aerosol can 10 against the urging force of the spring 13. As a result, the valve 11 is opened, and the pest action inhibitor 100 flows into the communication path 27 of the head cap 20 in a particulate state, flows upward, flows into the flow path 32 of the nozzle 30, and enters the upstream portion 32a, downstream. It circulates through the part 32b in order and is injected from the injection port 31.

  The pest behavior inhibitor particles ejected from the ejection port 31 are large, the large particles are dispersed in a wide range, and the flow velocity of the particles is increased. That is, the flow rate of particles flowing into the flow path 32 of the nozzle 30 is sufficiently increased while flowing through the upstream portion 32a because the upstream portion 32a is narrowed. Thereafter, when the downstream portion 32b is reached through the formation portion of the step portion 34 in the flow channel 32, the cross-sectional area rapidly increases, so that the flow velocity of the particles decreases and the particles from the rear are integrated while colliding with large particles. Form. Furthermore, the flow velocity of some of the particles decreases, and a plurality of particles adhere to the inner surface of the downstream portion 32b to form large particles.

  Next, the cooling performance and backfire prevention performance of the pest control aerosol 1 according to this embodiment will be described with reference to Table 1.

  Table 2 shows a comparative example. In Table 2, the “straight structure” is a structure in which the flow path 32 of the nozzle 30 has the same inner diameter from upstream to downstream. In Tables 1 and 2, the “two-stage structure” is a structure in which the downstream portion 32b of the flow path 32 of the nozzle 30 has a larger diameter than the upstream portion 32a.

  A method for measuring the cooling performance is shown in FIGS. That is, the automatic spraying device 50 is provided away from the shoji paper 51 placed on the horizontal surface, and the insect spray controlling aerosol 1 is held in the automatic spraying device 50. The spray port 31 of the insect pest-control aerosol 1 is disposed so as to face the shoji paper 51 immediately above the shoji paper 51. The automatic spraying device 50 includes an actuator 50a such as a fluid pressure cylinder, for example, and is configured to be able to push the pressing portion 24 of the insect pest controlling aerosol 1 for a predetermined time by the actuator 50a.

  The shoji paper 51 is provided with a temperature measuring terminal 52 made of, for example, a thermocouple. The temperature measuring terminal 52 is arranged at a position 2 cm away from the spray center (indicated by symbol Y in FIG. 5).

  The ambient temperature at the time of measurement is 25 ° C. Moreover, the spraying time of the pest control aerosol 1 by the automatic spraying device 50 is 1 second. The spray amount of the pest behavior inhibitor for 1 second is 2.5 g or more and 5.0 g or less. The cooling performance in Tables 1 and 2 is the temperature at the time when 10 seconds have elapsed after the spraying of the pest control aerosol 1 is completed. The lower this temperature is, the more heat is taken away from the pests, and the more effective against the pests.

  Examples 1 to 31 in Table 1 and Comparative Examples 1, 2, 7, and 8 in Table 2 all have a temperature of 10 seconds or less and 0 ° C. or less, and have high cooling performance. I understand. On the other hand, in Comparative Examples 3 to 6, the temperature at the time when 10 seconds passed is 0 ° C. or more, and the amount of heat taken away from the pests is reduced, so the effectiveness against the pests is low.

  A method for measuring the cockroach behavior inhibition rate will be described with reference to FIGS. That is, the automatic spraying device 50 used at the time of measuring the cooling performance is arranged away from the shoji paper 51 placed on the horizontal plane. A glass cylindrical member 60 having an inner diameter of 7 cm as shown in FIG. 6 is placed on the horizontal plane immediately below the injection port 31 of the pest control aerosol 1 so as to open upward. Reference numeral Y denotes a spray center, which is coincident with the center of the cylindrical member 60. In the inside of the cylindrical member 60, a black cockroach adult female was placed as a test insect.

Then, after fixing the test insect in the range indicated by the oblique lines in FIG. 6, that is, in the range 2 cm or more away from the spray center Y, the insect pest action inhibitor 100 was sprayed from the insect control aerosol 1 by the automatic spray device 50. That is, the measurement conditions are set assuming a case where the user's aim is deviated or a case where the test insect moves from the spray center Y after the aim is set and before the pressing part 24 of the pest control aerosol 1 is pressed. The spraying time is 1 second. The ambient temperature is 25 ° C. Ten test insects were prepared and the effect was observed one by one. Observe the state of the test insect after spraying,
(Total number of individuals-Number of individuals walking normally) / Total number of individuals = Cockroach behavior inhibition rate (%)
Calculated as

  In Examples 1 to 31 in Table 1 and Comparative Examples 1, 7, and 8 in Table 2, the cockroach behavior inhibition rate was 50% or more, whereas in Comparative Examples 2 to 6, the cockroach behavior inhibition rate was less than 50%. Met.

  From the measurement results of Table 1, in the examples, since the pest behavior inhibitor particles having a large particle size are dispersed in a wide range, the pest behavior having a large particle size with respect to the test insects away from the spray center Y. It can be seen that the inhibitor particles are attached and take a lot of heat from the test insects when the particles evaporate.

  On the other hand, the measuring method of flashback is shown in FIGS. 7 and 8, it is assumed that the flame is generated in a range surrounded by a solid line. First, as shown in FIG. 7, the gas burner G is disposed at a position 15 cm away from the spray port 31 of the insect pest controlling aerosol 1 in the horizontal direction. The gas burner G is ignited and used as a fire source. The flame height of the gas burner G is adjusted to be 4.5 to 5.5 cm. Then, the pest action inhibitor 100 is sprayed from the pest control aerosol 1 so as to pass through the upper third of the flame of the gas burner G for 5 seconds, and a photograph is taken after 3 seconds from the start of injection. Judged backfire. “Cm” in Tables 1 and 2 indicates the length of the flame generated in the direction approaching the injection port 31 from the gas burner G as shown in FIG.

  In the case of Examples 1 to 31 in Table 1 and Comparative Examples 2 to 6 in Table 2, there was almost no backfire, or even if backfire occurred, there was no problem. On the other hand, in the case of Comparative Examples 1, 7, and 8, since the backfire reaches the injection port 31 of the pest control aerosol 1, there is a possibility that the situation becomes undesirable during actual use.

  From the results of the above three tests, regarding the relationship between the inner diameter D1 of the upstream portion 32a of the flow channel 32 and the inner diameter D2 of the downstream portion 32b of the flow channel 32, D2 / D1 is greater than 1.07 and 1.63 or less. If it is set, even higher cooling performance can be obtained.

  Further, the inner diameter D1 of the upstream portion 32a of the flow path 32 is set to 1.6 mm or more and 2.6 mm or less, and the inner diameter D2 of the downstream section 32b of the flow path 32 is set to 2.2 mm or more and 3.4 mm or less. If it is, the risk of flashback can be prevented without impairing the cooling performance.

  Also, the target insect pest of the pest control aerosol 1 is preferably used indoors because it has the property that the pest behavior inhibitor 100 does not remain at the sprayed location. These are cockroaches such as cockroaches and cockroaches, spiders, centipedes, ants and stink bugs. In addition, flying insects such as flies such as house flies, flies flies, centriform flies, mosquito flies, Drosophila melanogaster, butterflies and fleas, mosquitoes such as Culex pipiens and Aedes albopictus, and bees are also target pests. Further, it can exert an extermination effect against pyrethroid resistant pests.

  As described above, according to this embodiment, the pest behavior inhibitor flowing out from the aerosol can 10 flows through the flow path 32 of the nozzle 30 and is injected from the injection port 31, and at this time, the flow path of the nozzle 30 32, the upstream portion 32a has a narrower cross-sectional area than the downstream portion 32b, so that the flow rate of the pest behavior inhibitor 100 flowing through the upstream portion 32a of the flow path 32 is increased. When the pest action inhibitor 100 reaches the downstream portion 32b of the flow path 32, the cross-sectional area increases and the flow velocity decreases, and at this time, the particles that have circulated through the upstream portion 32a of the flow path 32 are integrated into large particles. Form. Since the large particles are ejected from the ejection port 31, the amount of the pest behavior inhibitor 100 adhering to the pest in a liquid state increases. As a result, the amount of heat taken from the pests before the pest behavior inhibitor particles completely evaporate can be greatly increased.

  Since the flow velocity of the particles ejected from the ejection port 31 is increased at the upstream portion 32a of the flow path 32 of the nozzle 30 as described above, the velocity is sufficient. Therefore, for example, even if the pest behavior inhibitor 100 is ignited during injection, particles are injected faster than the speed at which the flame reaches the injection port 31, and the backfire phenomenon can be suppressed.

  The above-described embodiment is merely an example in all respects and should not be interpreted in a limited manner. Further, all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present invention.

  The pest control aerosol according to the present invention can be used to control pests such as cockroaches.

1 Pest control aerosol 10 Aerosol can (aerosol container)
20 Head Cap 30 Nozzle 31 Injection Port 32 Channel 32a Upstream Portion 32b Downstream Portion 100 Pest Behavior Inhibitor

Claims (4)

An aerosol container containing a pest behavior inhibitor that adheres to the pest and cools the pest by vaporization heat to inhibit the behavior;
In the pest control aerosol provided with a nozzle for injecting the pest behavior inhibitor of the aerosol container,
The nozzle is formed such that a flow path of the pest behavior inhibitor that has flowed out of the aerosol container communicates with an injection port.
The flow path has a cross-sectional area on the downstream side in the flow direction of the pest action inhibitor that is set larger than that on the upstream side, and the inner diameter on the upstream side of the flow path is D1, and the inner diameter on the downstream side of the flow path. D2 / D1 is set to be larger than 1.07 and 1.63 or less, where D2 is D2. In the pest control aerosol according to claim 1,
The inner diameter of the upstream side of the flow path is set to 1.6 mm or more and 2.6 mm or less,
An aerosol for pest control, wherein an inner diameter of the downstream side of the flow path is set to 2.2 mm or more and 3.4 mm or less. In a nozzle structure that is provided in an aerosol container containing a pest action inhibitor that adheres to a pest and cools the pest by vaporization heat to stop the action, and injects the pest action inhibitor in the aerosol container,
The pest behavior inhibitor channel that has flowed out of the aerosol container is formed to communicate with the injection port,
The flow path has a cross-sectional area on the downstream side in the flow direction of the pest action inhibitor that is set larger than that on the upstream side, and the inner diameter on the upstream side of the flow path is D1, and the inner diameter on the downstream side of the flow path. D2 / D1 is set to be larger than 1.07 and 1.63 or less where D2 is D2. In the nozzle structure according to claim 3,
The inner diameter of the upstream side of the flow path is set to 1.6 mm or more and 2.6 mm or less,
An inner diameter of the downstream side of the flow path is set to 2.2 mm or more and 3.4 mm or less.

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