Insect trap and insect trapping method

Abstract

To provide an insect trap which can efficiently trap flying insect pests while suppressing the escape rate of the flying insect pests, and to provide an insect trapping method.SOLUTION: The suction port 3 is provided in the housing 2 and gas into the housing 2. The discharge port 4 is provided in the housing 2 and discharges the sucked gas to the outside of the housing 2. The blowing device 5 is provided in the housing 2 and generates a flow of gas from the inlet 3 toward the outlet 4. The blowing device 5 is provided so as to generate a gas flow that accelerates at an acceleration equal to or greater than 6m / s2 toward the suction port 3 in the vicinity of the suction port 3.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an insect trap and an insect trapping method. [Background technology]

[0002] BACKGROUND ART Conventionally, an insect trap has been proposed that sucks in and collects flying pests such as mosquitoes and small flies through an intake port using a suction fan device (air blower) disposed in a case (housing) (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7351832 Summary of the Invention [Problem to be solved by the invention]

[0004] However, insect traps using conventional blowers have a problem in that many flying pest insects, even if they fly near the intake port, are not sucked into the intake port and escape instead.

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and its object is to provide an insect trap and an insect catching method that can reduce the escape rate of flying pest insects and catch them efficiently. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, the insect trap and the insect trapping method according to the present invention are characterized by the following [1] to [3]. [1] The housing and an intake port provided in the housing for drawing gas into the housing; an exhaust port provided in the housing for exhausting the sucked gas to the outside of the housing; a blower provided in the housing and configured to generate a flow of the gas from the intake port to the exhaust port, An insect trap that captures flying pests by sucking them into the housing through the suction port, 6 m / s toward the intake port near the intake port 2 The blower is provided so as to generate the gas flow accelerating at the above acceleration. It is an insect trap. [2] In the insect trap described in [1], 6 m / s toward the intake port near the intake port 2 The blower is provided so as to generate a flow of the gas that accelerates at or above a speed of 0.7 m / s or more. It is an insect trap. [3] An insect trapping method for trapping flying pests by generating a gas flow from an intake port of a housing to an exhaust port, and sucking flying pests into the housing through the intake port of the housing, 6 m / s toward the intake port near the intake port 2 The gas flow accelerates at an acceleration of at least It is a method of catching insects.

[0007] According to the configuration of [1] above, the airflow speed is 6 m / s 2 A gas flow is generated that accelerates at an acceleration rate equal to or greater than this, reducing the escape rate of flying pests and enabling efficient insect capture. According to the configuration of [2] above, the airflow speed is 6 m / s 2 This accelerates the air and generates a gas flow with a wind speed of 0.7 m / s or more, which further reduces the escape rate of flying pests and allows for efficient insect capture. According to the configuration of [3] above, the airflow speed is 6 m / s 2 A gas flow is generated that accelerates at an acceleration rate equal to or greater than this, reducing the escape rate of flying pests and enabling efficient insect capture. [Effects of the Invention]

[0008] The insect trap and insect trapping method according to the present invention have the effect of reducing the escape rate of flying pest insects and enabling efficient insect trapping.

[0009] The present invention has been briefly described above. The details of the present invention will become clearer by reading the following detailed description of the invention (hereinafter referred to as "embodiments") with reference to the accompanying drawings. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a perspective view showing an embodiment of an insect trap that implements the insect trapping method of the present invention. [Figure 2] FIG. 2 is a cross-sectional view taken along line AA in FIG. [Figure 3] FIG. 3 is a perspective view of an experimental setup for analyzing the gas flow near the intake port of the insect trap shown in FIG. [Figure 4] FIG. 4 is a perspective view of an experimental setup for analyzing the flight trajectory of flying pest insects near the suction port of the insect trap shown in FIG. [Figure 5] FIG. 5 is an explanatory diagram showing, by vectors, the direction and velocity of the gas flow near the intake port of the insect trap shown in FIG. [Figure 6] FIG. 6 is an explanatory diagram showing the flight trajectory of a test insect sucked into the housing near the suction port of the insect trap shown in FIG. [Figure 7] FIG. 7 is an explanatory diagram showing the flight trajectory of a test insect that escaped near the intake port of the insect trap shown in FIG. 1 without being sucked into the housing. [Figure 8] FIG. 8 is a graph showing the results of sampling the flight trajectory of the flying pest (test insect, Aedes albopictus) shown in FIGS. 6 and 7 and plotting the velocity and acceleration at each sampling position. [Figure 9] FIG. 9 is a graph showing the results of sampling the flight trajectory of a flying pest insect (test insect, Culex pipiens mosquito) and plotting the velocity and acceleration at each sampling position. DETAILED DESCRIPTION OF THE INVENTION

[0011] Specific embodiments of the present invention will be described below with reference to the drawings. An insect trap 1 according to one embodiment of the present invention shown in Figures 1 and 2 is installed on the floor or the like in a living room.

[0012] For convenience of explanation, "front," "rear," "left," "right," "upper," and "lower" will be defined below as shown in Figures 1 to 4. The "front-rear direction," "left-right direction," and "up-down direction" are perpendicular to each other.

[0013] As shown in Figures 1 and 2, insect trap 1 comprises a housing 2, an intake port 3 provided in housing 2 for drawing gas into housing 2, an exhaust port 4 (see Figure 2) provided in housing 2 for discharging the drawn gas out of housing 2, and a blower 5 provided in housing 2 for generating a gas flow (indicated by the arrow in Figure 2) from intake port 3 to exhaust port 4.

[0014] In this embodiment, the housing 2 has a main body 21, an upper cover 22, four legs 23, and four legs 24. The main body 21 has a rectangular bottom wall 211, a side wall 212 standing upward from the periphery of the bottom wall 211, and a top wall 213 closing an upper opening of the side wall 212, and is provided in the shape of a cubic or rectangular parallelepiped box.

[0015] An exhaust port 4 is provided in the lower wall 211, and a through-hole 214 is provided in the upper wall 213. The through-hole 214 and the exhaust port 4 face each other in the vertical direction. The upper cover 22 is disposed above the upper wall 213 of the main body 21. Four legs 23 are provided between the upper cover 22 and the main body 21. The intake port 3 is provided between these four legs 23. The four legs 24 are provided so as to protrude downward from the four corners of the lower wall 211 of the main body 21.

[0016] The blower 5 is housed in the main body 21. When the blower 5 is driven, as shown in Fig. 2, gas is drawn into the housing 2 through the intake port 3, and a flow of gas is generated that passes through the through-hole 214 and is discharged to the outside of the housing 2 through the exhaust port 4.

[0017] The blower 5 blows air at a speed of 6 m / s toward the intake port 3 near the intake port 3 outside the housing 2. 2 The air is accelerated by the above and is provided so as to generate a gas flow with a wind speed of 0.7 m / s or more. Here, "near the intake port 3" means a distance of 162 mm or less from the intake port 3. More specifically, "near the intake port 3" includes a range of 162 mm or less from the opening face of the intake port 3 and a range of 162 mm or less in radius from the end of the intake port 3.

[0018] When the blower device 5 is driven, a gas flow toward the suction port 3 is generated near the suction port 3. The wind speed increases outside the housing 2 as it approaches the suction port 3. That is, the gas flow outside the housing 2 increases in wind speed from 0 m / s as it approaches the suction port 3, and reaches 0.7 m / s or more before being sucked into the housing 2 through the suction port 3. It is desirable that the wind speed of this gas flow near the suction port 3 outside the housing 2 be 0.7 m / s or more, more desirably 0.8 m / s or more, and even more desirably 0.9 m / s or more. Furthermore, the acceleration of this gas flow near the suction port 3 outside the housing 2 is 6 m / s or more. 2 It is desirable that the speed be more than 8m / s 2 It is desirable that the speed be more than 9m / s 2 It is desirable that the speed be more than 10m / s 2 It is desirable that the acceleration at the point where the gas flow is 0.7 m / s or more is 6 m / s 2 It is even more desirable that the above be true.

[0019] More preferably, the air velocity is 6 m / s toward the intake port 3 near the intake port 3 outside the housing 2. 2 Over 80m / s 2 It is desirable to provide the blower 5 so as to generate a gas flow that accelerates at a rate of 0.7 m / s or more and has a wind speed of 0.7 m / s or more and 3.5 m / s or less.

[0020] According to the above-described insect trap 1, the air flows toward the intake port 3 at a speed of 6 m / s 2This accelerates the air and generates a gas flow with a wind speed of 0.7 m / s or more, reducing the escape rate of flying pests and allowing for efficient insect capture. Flying pests include, but are not limited to, mosquitoes, flies, and small gnats. In particular, this method is suitable for capturing mosquitoes such as Aedes mosquitoes, Culex mosquitoes, and Anopheles mosquitoes.

[0021] Next, the background to the invention will be explained. The inventors conducted Experiments 1, 2, and 3 below in order to provide an insect trap 1 using a blower 5 that reduces the escape rate of flying pest insects and efficiently traps them.

[0022] [Experiment 1] The inventors conducted Experiment 1 to analyze the gas flow near the intake port 3 of the insect trap 1. First, as shown in Figure 3, the insect trap 1 shown in Figures 1 and 2 was placed on the floor inside the chamber 10. The chamber 10 was box-shaped, with height H1, width W1, and length L1 of 1 m x 1 m x 1 m. The chamber 10 was made of a transparent material such as an acrylic plate, so that the inside of the chamber 10 could be seen from outside.

[0023] The insect trap 1 has an upper cover 22 with a width W2 of 144.60 mm and a length L2 of 140.00 mm, a leg 23 with a height H2 of 112.00 mm, and a body 21 and leg 24 with a height H3 of 253.00 mm. In experiment 1, of the four intake ports 3 provided between the legs 23, three intake ports 3 on the front, rear, and right sides were covered with covers 11.

[0024] The chamber 10 described above was filled with particles (smoke), and the particles were visualized by irradiating them with laser light from a laser sheet light source 12 located on the left side outside the chamber 10. In addition, images of the particles inside the chamber 10 were taken with a high-speed camera 13 located on the rear side outside the chamber 10.

[0025] Next, the particle movement captured by the high-speed camera 13 was analyzed, and the direction and velocity of the gas flow near the inlet 3 were vectorized. In this specification, the particle flow velocity analyzed here is treated as wind velocity. The results are shown in Figure 5. As shown in the figure, it was found that the flow velocity slowed down with increasing distance from the inlet 3.

[0026] [Experiment 2] Next, the inventors conducted Experiment 2 to observe the behavior of flying pest insects near the intake port 3 of the insect trap 1. First, as shown in FIG. 4, the insect trap 1 shown in FIGS. 1 and 2 was placed in a chamber 10. The chamber 10 was the same as that used in Experiment 1. The insect trap 1 was the same as that used in Experiment 1, and three of the four intake ports 3 were also covered with covers 11.

[0027] The chamber 10 was covered with white construction paper. Thirty flying pest insects (test insects, Aedes albopictus (female adult)) were released into the chamber 10 with the temperature in the chamber 10 kept at approximately 25-30°C and the humidity at approximately 20-60%. Then, a high-speed camera 13 placed outside the rear of the chamber 10 captured images of the test insects released into the chamber 10. An LED light source plate 14 was placed outside the chamber 10 in a position facing the high-speed camera 13.

[0028] Next, the movements of the test insects captured by the high-speed camera 13 were analyzed, and the flight trajectories of the test insects that were sucked into the housing 2 were compared with those of the test insects that escaped without being sucked into the housing 2. The results are shown in Figures 6 and 7. Figure 6 is an explanatory diagram showing the flight trajectories of the test insects that were sucked into the housing near the suction port of the insect trap 1 shown in Figure 1. In Figure 6, the flight trajectories of six cases of inhalation are shown by dotted lines or dashed-dotted lines. Figure 7 is an explanatory diagram showing the flight trajectories of the test insects that were not sucked into the housing 2 near the suction port of the insect trap shown in Figure 1 and escaped. In Figure 7, the flight trajectories of four cases of escape are shown by dotted lines or dashed-dotted lines.

[0029] From Figures 6 and 7, it was found that test insects that approached from the bottom of the intake port 3 tended to be sucked in. It was also found that only test insects that approached from the top of the intake port 3 escaped. It was also found that escaped test insects always escaped upwards.

[0030] Furthermore, from the movement trajectories of the flying pests shown in Figures 6 and 7 and the change in gas flow rate shown in Figure 5, it was found that the gas flow from the top of the intake port 3 toward the inside of the housing 2 has a smaller acceleration than the gas flow from the bottom of the intake port 3 toward the inside of the housing 2.

[0031] As described above, the acceleration along the movement trajectory differs between the upper and lower parts of the suction port 3. Therefore, the inventors suspected that acceleration might be related to the escape of flying pests. Therefore, they sampled the flight trajectories of flying pests (test insects, Aedes albopictus) and plotted the speed and acceleration at each sampling position. The results are shown in FIG. 8. In FIG. 8, the speed and acceleration of the flight trajectories of six insects that were sucked into the housing 2 shown in FIG. 6 are mapped with open circles. Also, in FIG. 8, the speed and acceleration of the flight trajectories of four insects that escaped without being sucked into the housing 2 shown in FIG. 7 are mapped with filled circles. The standard deviation (σ) was calculated from the average value of the speed and acceleration of the flight trajectories of the four insects that escaped without being sucked, and the value obtained by adding twice the standard deviation to the average value (average value + 2σ) was calculated as the speed and acceleration threshold value. In other words, if the speed and acceleration are normally distributed, the probability that the speed and acceleration of the flight trajectory that escaped without being sucked in falls within the threshold value can be said to be at least approximately 95%. In FIG. 8, the threshold values ​​of velocity and acceleration are indicated by dashed lines.

[0032] As is clear from Figure 8, the acceleration is 6m / s 2 It was found that flying pests flying in a velocity field where the acceleration is less than 6 m / s and the velocity is less than 0.7 m / s have a high probability of escaping. 2 In other words, it is necessary to minimize the velocity field where the air velocity is less than 6 m / s toward the intake port 3 near the intake port 3 outside the housing 2. 2It was found that if the blower 5 is provided so as to accelerate the air and generate a gas flow with a wind speed of 0.7 m / s or more, the escape rate of flying pests can be reduced and they can be caught efficiently.

[0033] In addition, near the intake port 3 outside the housing 2, the air velocity is 8 m / s 2 It was found that if the blower 5 is provided so as to accelerate the air flow and generate a gas flow with a wind speed of 0.8 m / s or more, the escape rate of flying pests can be further reduced and insects can be caught more efficiently. 2 It was found that if the blower 5 is installed so as to accelerate the air flow and generate a gas flow with a wind speed of 0.9 m / s or more, the escape rate of flying pests can be further reduced and the insects can be captured more efficiently.

[0034] [Experiment 3] Next, the inventors conducted Experiment 3 to confirm whether similar effects could be obtained with mosquitoes other than Aedes albopictus. Experiment 3 differs from Experiment 2 described above in that the test insect was changed from Aedes albopictus to Culex pipiens. As in Experiment 2, the chamber 10 was surrounded by white construction paper. Thirty flying pest insects (test insects, Culex pipiens (female adults)) were released into the chamber 10 under conditions of a temperature of approximately 25-30°C and a humidity of approximately 20-60%. Images of the test insects released into the chamber 10 were then captured by a high-speed camera 13 located outside the rear of the chamber 10. An LED light source plate 14 was located outside the chamber 10, facing the high-speed camera 13.

[0035] Next, the movements of the test insects photographed by the high-speed camera 13 were analyzed, and the flight trajectories of the flying pests (test insects, Culex pipiens mosquitoes) that were sucked into the housing 2 and the flight trajectories of the test insects that escaped without being sucked into the housing 2 were sampled, and the speed and acceleration at each sampling position were plotted. The results are shown in Figure 9.

[0036] As is clear from FIG. 9, near the intake port 3 outside the housing 2, a 6 m / s2 It was found that if the blower 5 is installed so as to accelerate the air flow and generate a gas flow with a wind speed of 0.7 m / s or more, the escape rate of Culex pipiens mosquitoes can be reduced more efficiently than that of Aedes albopictus mosquitoes.

[0037] Next, the present inventors conducted the following Experiment 4 to confirm whether a similar effect could be obtained for Anopheles mosquitoes.

[0038] [Experiment 4] The same insect trap 1 as used in Experiments 1 to 3 was placed on the floor of the chamber. The same voltage as in Experiments 1 to 3 was applied to the air blower 5 of the insect trap 1. As a result, the flow velocity and acceleration near the intake port 3 of the insect trap 1 were as shown in Figure 5, similar to Experiments 1 to 3. In Experiment 4, the size of the chamber was 0.7 m x 0.7 m x 0.7 m.

[0039] Next, 10 Culex pipiens mosquitoes (adult females) were released into the chamber as test insects, and the number of insects captured after 10 minutes was observed. Similarly, 10 Aedes albopictus (adult females) and Anopheles mosquitoes (adult females) were released into the chamber as test insects, and the number of insects captured after 10 minutes was observed. These observations were performed twice for each of Culex pipiens, Aedes albopictus, and Anopheles mosquitoes. The results are shown in Table 1. As shown in Table 1, the temperature inside the chamber was kept in the range of approximately 25-30°C. The humidity inside the chamber was also kept in the range of approximately 20-40%.

[0040] [Table 1]

[0041] The capture rates after 10 minutes were calculated for Culex pipiens, Aedes albopictus, and Anopheles gambiae from the results in Table 1. The results are shown in Table 2.

[0042] [Table 2]

[0043] As shown in Table 2, it was found that Culex pipiens mosquitoes have a higher capture rate than Aedes albopictus mosquitoes. This is because the speed of the airflow toward the intake port was 6 m / s 2 This is consistent with the results of Experiments 2 and 3, which show that if a blower 5 is installed so that the gas accelerates and a gas flow with a wind speed of 0.7 m / s or more is generated, the escape rate of Culex taeniorhynchus mosquitoes can be reduced more efficiently than that of Aedes albopictus mosquitoes.

[0044] Furthermore, as shown in Table 2, it was found that the capture rate of Anopheles mosquitoes was higher than that of Aedes albopictus. Since the insect trap 1 was the same as that in Experiments 1-3, the velocity of the air flowing toward the intake port 3 was 6 m / s 2 If the blower 5 is provided so as to accelerate the air and generate a gas flow with a speed of 0.7 m / s or more, it can be said that the escape rate of Anopheles mosquitoes is lower than that of Aedes albopictus, and they can be captured more efficiently.

[0045] Therefore, Anopheles mosquitoes, like Aedes albopictus and Culex pipiens, move at a speed of 8 m / s near the intake port 3 outside the housing 2. 2 It was found that if the blower 5 is provided so that the gas flow accelerates and the wind speed is 0.8 m / s or more, the escape rate can be further reduced and the insects can be caught more efficiently. 2 It was found that if the blower 5 is provided so as to accelerate the air flow and generate a gas flow with a wind speed of 0.9 m / s or more, the escape rate can be further reduced and insects can be trapped more efficiently.

[0046] As described above, experiments were conducted on representative mosquito species, such as Anopheles, Aedes, and Culex, to confirm the effectiveness. However, mosquitoes have roughly the same size and flying ability regardless of species. Therefore, it is predicted that the insect trap 1 of this embodiment will be able to efficiently trap mosquitoes, reducing their escape rate, regardless of the species.

[0047] The present invention is not limited to the above-described embodiments, and can be appropriately modified, improved, etc. In addition, the material, shape, size, number, location, etc. of each component in the above-described embodiments are arbitrary and not limited as long as they can achieve the present invention.

[0048] The shape of the housing 2 described above is not limited to that shown in Fig. 1. The housing 2 may have any shape as long as it can accommodate the blower 5 therein and can be provided with the intake port 3 and exhaust port 4. Furthermore, the intake port 3 need only be located in a position where gas can be drawn in by driving the blower 5, and is not limited to the shape and position shown in Fig. 1. Furthermore, the exhaust port 4 need only be located in a position where gas can be discharged by driving the blower 5, and is not limited to the shape and position shown in Fig. 1.

[0049] The above-mentioned insect trap 1 has an acceleration of 6 m / s at the bottom near the intake port 3. 2 The velocity field is above 0.7m / s, but the upper part has an acceleration of 6m / s 2 The acceleration is less than 6 m / s and the velocity is less than 0.7 m / s. 2 It may be possible to ensure that there are no velocity fields where the velocity is less than 0.7 m / s. [Explanation of symbols]

[0050] 1 insect trap 2. Case 3 Intake port 4 Outlet 5. Blower

Claims

1. The housing and an intake port provided in the housing for drawing gas into the housing; an exhaust port provided in the housing for exhausting the sucked gas to the outside of the housing; a blower provided in the housing and configured to generate a flow of the gas from the intake port to the exhaust port, An insect trap that captures flying pests by sucking them into the housing through the suction port, At a speed of 6 m / s toward the intake port near the intake port ２ The blower is provided so as to generate the gas flow accelerating at the above acceleration. Insect trap.

2. 2. The insect trap according to claim 1, At a speed of 6 m / s toward the intake port near the intake port ２ The blower is provided so as to generate a flow of the gas that accelerates at or above the speed of 0.7 m / s or more. Insect trap.

3. An insect trapping method for trapping flying pests by generating a gas flow from an intake port of a housing to an exhaust port, and sucking flying pests into the housing through the intake port of the housing, At a speed of 6 m / s toward the intake port near the intake port ２ The gas flow accelerates at an acceleration of at least Insect catching method.

Images