Mosquito and fly trapping device

By designing a mosquito and fly trapping device that includes trapping, cleaning, collecting and interference mechanisms, the problems of low automation functions and inconvenient cleaning in the prior art are solved, and automated trapping and cleaning are realized, which improves the convenience of the device and the long-term automatic operation capability.

CN120021597AInactive Publication Date: 2025-05-23李达奇
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Patent Information

Application Number
CN202510456815.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-04-12
Publication Date
2025-05-23
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

The existing mosquito and fly trapping devices have low automation functions and require manual cleaning during use. After a long period of use, they will lose the trapping and insect killing function, resulting in inconvenience.

Method used

A mosquito and fly trapping device including a main frame, a trapping mechanism, a cleaning mechanism, a collection mechanism and a disturbance mechanism is designed. The trapping mechanism lures mosquitoes and flies through insect trapping bait tanks and insect trapping lamps, and the power grid conducts trapping; the cleaning mechanism automatically cleans mosquitoes and flies on the power grid through sliding motors and brush plates; the collection mechanism flexibly collects trapped mosquitoes and flies through the carrier rack and collection box; the interference mechanism prevents mosquitoes and flies from accumulating through fans and protective nets.

Benefits of technology

The automatic trapping and cleaning of the mosquito and fly trapping device is realized, which improves the convenience of the device and the long-term automatic operation capability, ensuring the continuous effectiveness of the trapping function.

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Abstract

The invention belongs to the technical field of vector organism control, and provides a mosquito and fly trapping device which comprises a main body frame and a connecting frame. The trapping mechanism is fixedly arranged at the bottom of the main body frame; the cleaning mechanism is slidably arranged at the bottom of the main body frame; the collecting mechanism is fixedly arranged at the bottom of the trapping mechanism; the interference mechanism is fixedly arranged in the main body frame; the main body frame is provided with the insect trapping bait tank and the insect trapping lamp, so that the main body frame can conveniently trap mosquitoes and flies through the insect trapping bait tank and the insect trapping lamp, and the trapped mosquitoes and flies are trapped through the plurality of power grids on the outer sides of the insect trapping bait tank and the insect trapping lamp; according to the mosquito and fly trapping device, the fan is arranged, so that when the sliding motor drives the sliding frame and the brush plate to clean trapped mosquitoes and flies adhered to the power grid, the fan can prevent the mosquitoes and flies from being accumulated at the top of the sliding frame, the purposes of automatically trapping the mosquitoes and flies for a long time and automatically cleaning and using the mosquito and fly trapping device are achieved, and the use convenience of the mosquito and fly trapping device is improved.
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Description

Technical Field

[0001] The invention belongs to the technical field of vector control, in particular to a mosquito and fly trapping device. Background Art

[0002] Vector control technology involves a series of measures to control or eliminate organisms that can transmit human diseases. These organisms are usually called vectors. The main goal of these measures is to reduce the number of vectors to reduce the risk of them transmitting diseases to humans. The prevention and control of vectors is essential to protecting human health.

[0003] In today's social life, vectors mainly refer to mosquitoes, flies, rats, cockroaches and other organisms. In the process of killing and preventing mosquitoes and flies, trapping mosquitoes and flies is an important means. However, the mosquito and fly trapping devices currently used have low automation functions. After trapping mosquitoes and flies, the trapping devices need to be cleaned, otherwise the trapping devices will lose their trapping and insecticidal functions when used for a long time, which leads to certain inconveniences in the use of mosquito and fly trapping devices.

[0004] Therefore, those skilled in the art have proposed a mosquito and fly trapping device to solve the problems raised by the background technology. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a mosquito and fly trapping device to solve the problem of inconvenience in using the mosquito and fly trapping device in the prior art.

[0006] A mosquito and fly trapping device comprises: a main frame and a connecting frame, which are used to connect and support the mosquito and fly trapping device; a trapping mechanism, which is fixedly arranged at the bottom of the main frame and is used for trapping mosquitoes and flies; a cleaning mechanism, which is slidably arranged at the bottom of the main frame and is used for cleaning mosquitoes and flies after trapping; a collecting mechanism, which is fixedly arranged at the bottom of the trapping mechanism and is used for storing trapped mosquitoes and flies; and an interference mechanism, which is fixedly arranged in the main frame and is used for interference in mosquito and fly trapping.

[0007] Preferably, the trapping mechanism comprises an insect bait pot fixedly arranged at the middle position of the bottom of the main frame, and an insect attracting lamp is fixedly arranged at the bottom of the insect bait pot; the bottom of the main frame is located at the side of the insect bait pot, and a plurality of nozzles are fixedly arranged, and the nozzles are connected to the insect bait pot.

[0008] Preferably, the trapping mechanism further comprises a plurality of electric grids fixedly arranged at the bottom of the main frame and located outside the insect bait tank, and the plurality of electric grids are distributed in a ring shape with equal distances; a plurality of guardrails are fixedly arranged at the bottom of the main frame and located outside the plurality of electric grids.

[0009] Preferably, the cleaning mechanism includes two sliding shafts symmetrically fixedly arranged at the bottom of the main frame between several electric grids and the guardrail, and the main frame is slidably provided with a sliding motor and a connecting sleeve through the two sliding shafts; a sliding frame is slidably provided on the several electric grids, and two connecting rods are symmetrically fixedly arranged on the side wall of the sliding frame, and the sliding frame is fixedly provided with the sliding motor and the connecting sleeve through the two connecting rods.

[0010] Preferably, the cleaning mechanism also includes a brush plate screwed onto the bottom of the sliding frame, a plurality of connecting holes are provided on the sliding frame and the brush plate, and the electric grid passes through the sliding frame and the brush plate through the connecting holes; a mounting groove is provided at the bottom of the sliding frame, a mounting ring is fixedly provided on the top of the brush plate, and the mounting groove and the mounting ring are screwed onto each other.

[0011] Preferably, the collecting mechanism comprises a receiving frame fixedly arranged at the bottom of a plurality of guardrails, and a collecting box is screwed on the bottom of the receiving frame.

[0012] Preferably, the interference mechanism comprises a fan fixedly arranged inside the main frame, a plurality of air exhaust ports are provided at the top of the main frame, and a plurality of air inlets are provided at the bottom of the main frame.

[0013] Preferably, the interference mechanism further comprises a protective net fixedly arranged on the air outlet and the air inlet at the top and bottom of the main frame.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The present invention has an insect bait pot and an insect bait lamp fixedly connected inside a main frame, so that the main frame can easily attract mosquitoes and flies through the insect bait pot and the insect bait lamp, and then the attracted mosquitoes and flies are trapped through a plurality of electric nets outside the insect bait pot and the insect bait lamp. At the same time, a collection box is screwed and connected to the bottom of a plurality of guardrails through a receiving frame, so that the collection box can be flexibly adjusted for use, which is convenient for collecting the trapped mosquitoes and flies. Secondly, a fan is fixedly connected inside the main frame, so that when a sliding motor drives the sliding frame and the brush plate to clean the trapped mosquitoes and flies adhered to the electric net, the fan can prevent the mosquitoes and flies from accumulating on the top of the sliding frame, thereby achieving the purpose of the mosquito and fly catching device being convenient for long-term automatic catching of mosquitoes and flies and automatic cleaning use, thereby improving the convenience of use of the mosquito and fly catching device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is an overall structural diagram of the mosquito and fly trapping device of the present invention;

[0017] Figure 2 This is a diagram showing the structure of the mosquito and fly trapping device of the present invention;

[0018] Figure 3This is a diagram showing the power grid cleaning structure of the present invention;

[0019] Figure 4 For the present invention Figure 3 The structural diagram at A;

[0020] Figure 5 It is a structural diagram of the insect attracting component of the present invention;

[0021] Figure 6 This is a structural diagram of the fan air inlet of the present invention;

[0022] Figure 7 It is the installation structure diagram of the brush plate of the present invention.

[0023] In the figure:

[0024] 1. Main frame; 2. Connecting frame; 3. Guardrail; 4. Power grid; 5. Receiver frame; 6. Collecting box; 7. Sliding motor; 8. Nozzle; 9. Exhaust vent; 10. Sliding shaft; 11. Connecting sleeve; 12. Sliding frame; 13. Fan; 14. Insect attractant lamp; 15. Connecting rod; 16. Insect attractant bait tank; 17. Protective net; 18. Brush plate; 19. Mounting slot; 20. Mounting ring; 21. Connecting hole; 22. Air inlet. DETAILED DESCRIPTION

[0025] The following is a further detailed description of the embodiments of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0026] Embodiment 1:

[0027] As attached Figure 1 To Attachment Figure 7 As shown:

[0028] The present invention provides a mosquito and fly trapping device, comprising: a main frame 1 and a connecting frame 2, which are used to connect and support the mosquito and fly trapping device; a trapping mechanism, which is fixedly arranged at the bottom of the main frame 1 and is used for trapping mosquitoes and flies; a cleaning mechanism, which is slidably arranged at the bottom of the main frame 1 and is used for cleaning mosquitoes and flies after trapping; a collecting mechanism, which is fixedly arranged at the bottom of the trapping mechanism and is used for storing trapped mosquitoes and flies; an interference mechanism, which is fixedly arranged in the main frame 1 and is used for mosquito and fly trapping interference;

[0029] By fixing an insect bait pot 16 and an insect bait lamp 14 inside the main frame 1, the main frame 1 can easily lure mosquitoes and flies through the insect bait pot 16 and the insect bait lamp 14, and then the lured mosquitoes and flies are trapped through the several electric nets 4 outside the insect bait pot 16 and the insect bait lamp 14. At the same time, a collection box 6 is screwed and connected to the bottom of several guardrails 3 through a receiving frame 5, so that the collection box 6 can be flexibly adjusted and used, which is convenient for collecting the trapped mosquitoes and flies. Secondly, a fan 13 is fixedly connected inside the main frame 1, so that when the sliding motor 7 drives the sliding frame 12 and the brush plate 18 to clean the trapped mosquitoes and flies adhered to the electric net 4, the fan 13 can prevent the mosquitoes and flies from accumulating on the top of the sliding frame 12, thereby achieving the purpose of the mosquito and fly catching device being convenient for automatic catching of mosquitoes and flies for a long time and automatic cleaning, thereby improving the convenience of use of the mosquito and fly catching device.

[0030] refer to Figure 1 , Figure 2 , Figure 3 and Figure 5 The trapping mechanism includes a main frame 1, a guardrail 3, an electric grid 4, an insect bait tank 16 and an insect trap light 14;

[0031] By fixing the connecting frame 2 on the top of the main frame 1, the main frame 1 can be conveniently hung by the connecting frame 2 during use, so that it is convenient to hang it at a high place, which makes it easier to trap mosquitoes and flies. An insect bait can 16 is fixedly connected to the middle position of the bottom of the main frame 1, and a plurality of nozzles 8 are fixedly connected to the bottom of the main frame 1 at the outside of the insect bait can 16, so that carbon dioxide can be stored in the insect bait can 16, and then the carbon dioxide stored in the insect bait can 16 is released through the plurality of nozzles 8, so as to achieve the purpose of facilitating the main frame 1 to trap mosquitoes and flies by gas.

[0032] At the same time, an insect trap lamp 14 is fixedly connected to the bottom plate of the insect trap pot 16, so that the insect trap lamp 14 can emit light to trap mosquitoes and flies, so as to achieve the purpose of luring mosquitoes and flies into the main frame 1 with the insect trap pot 16, and a plurality of power grids 4 are fixedly connected to the bottom of the main frame 1 between the insect trap pot 16 and the nozzle 8, and the plurality of power grids 4 are electrically connected to an external power supply, so that when the insect trap pot 16 and the insect trap lamp 14 trap mosquitoes and flies into the main frame 1, the mosquitoes and flies will pounce on the insect trap lamp 14 due to their phototaxis, and the plurality of power grids 4 are electrically connected to the external power supply. The net 4 is located outside the insect-attracting lamp 14, and will electrocute and kill mosquitoes and flies that fly toward the insect-attracting lamp 14, thereby achieving the purpose of trapping mosquitoes and flies by a plurality of electric nets 4 in cooperation with the insect bait can 16 and the electric nets 4. Secondly, a plurality of protective fences 3 are fixedly connected to the outside of a plurality of nozzles 8 at the bottom of the main frame 1, so that the plurality of protective fences 3 can protect the plurality of electric nets 4, thereby preventing animals and plants from touching the electric nets 4, and the spacing between the plurality of protective fences 3 can allow mosquitoes and flies to enter the main frame 1, thereby not affecting the trapping of mosquitoes and flies by the electric net 4.

[0033] Embodiment 2:

[0034] refer to Figure 3 , Figure 4 and Figure 7 , the cleaning mechanism includes a sliding shaft 10, a sliding motor 7, a connecting sliding sleeve 11 and a sliding frame 12;

[0035] By symmetrically and fixedly connecting two sliding shafts 10 at the bottom of the main frame 1 outside the electric grid 4, the main frame 1 can be slidably connected to the sliding motor 7 and the connecting sleeve 11 through the two sliding shafts 10, the sliding motor 7 is electrically connected to the external power supply during use, and the sliding frame 12 is slidably connected to the plurality of electric grids 4, and two connecting rods 15 are symmetrically and fixedly connected to the side wall of the sliding frame 12, so that the sliding frame 12 is fixedly connected to the sliding motor 7 and the connecting sleeve 11 through the two connecting rods 15, respectively, so that after the electric grid 4 traps mosquitoes and flies, when mosquitoes and flies are attached to the electric grid 4, the sliding frame 12 can be driven by the sliding motor 7 to slide and lift on the plurality of electric grids 4, so that the mosquitoes and flies attached to the plurality of electric grids 4 can be scraped off by the sliding sliding frame 12, and the connecting sleeve 11 can assist the sliding motor 7 to be stably lifted and slid, so as to achieve the purpose of facilitating the sliding frame 12 to clean the mosquitoes and flies attached to the electric grid 4, thereby preventing the mosquitoes and flies attached to the electric grid 4 from affecting the trapping function of the electric grid 4;

[0036] At the same time, a brush plate 18 is screwed together at the bottom of the sliding frame 12, so that when the sliding frame 12 scrapes the mosquitoes and flies on the power grid 4, it is convenient to contact and scrape them through the brush plate 18, and a mounting groove 19 is opened at the bottom of the sliding frame 12, and a mounting ring 20 is fixedly connected to the top of the brush plate 18, so that the brush plate 18 can be easily screwed together and connected to the bottom of the sliding frame 12 through the mounting ring 20 and the mounting groove 19. In this way, after the brush plate 18 has been used for a long time, a new brush plate 18 can be easily replaced, thereby avoiding the problem of the brush plate 18 not scraping the mosquitoes and flies on the power grid 4 cleanly, and a plurality of connecting holes 21 are opened on the sliding frame 12 and the brush plate 18, so that the power grid 4 can easily pass through the sliding frame 12 and the brush plate 18 through the plurality of connecting holes 21. Secondly, the bottom of the power grid 4 is an open structure, so that the brush plate 18 can be easily disassembled, replaced and used.

[0037] Embodiment three:

[0038] refer to Figure 1 and Figure 2 , the collecting mechanism includes a receiving frame 5 and a collecting box 6;

[0039] By fixing a receiving frame 5 at the bottom of several guardrails 3 and screwing a collecting box 6 at the bottom of the receiving frame 5, when the main frame 1 is in use and it is necessary to collect and process the trapped mosquitoes and flies, the collecting box 6 can be screwed and connected at the bottom of the receiving frame 5, so that the trapped mosquitoes and flies can be collected and processed through the collecting box 6. When it is not necessary to collect and process the trapped mosquitoes and flies, the collecting box 6 can be disassembled from the bottom of the receiving frame 5, so as to directly discharge the trapped mosquitoes and flies in the main frame 1.

[0040] refer to Figure 1 , the interference mechanism includes a fan 13 and a protective net 17;

[0041] A fan 13 is fixedly connected inside the main frame 1, and a plurality of air inlets 22 are opened at the top of the main frame 1, and a plurality of air outlets 9 are opened at the bottom of the main frame 1, so that the main frame 1 can inhale air from the plurality of air inlets 22 during use, and then discharge air from the plurality of air outlets 9, and a protective net 17 is fixedly connected to the outside of the air inlet 22 and the air outlet 9, so that the fan 13 can prevent mosquitoes, flies and insects from entering the fan 13 through the protective net 17 during use;

[0042] After trapped flies are attached to several electric nets 4, when it is necessary to clean the electric nets 4, first turn off the insect bait can 16 and the insect trap lamp 14, start the fan 13, and discharge strong wind through several exhaust ports 9 to blow away the carbon dioxide emitted by the nozzle 8 in the main frame 1 and the untrapped flies, and then drive the sliding frame 12 and the brush plate 18 to lift and scrape the trapped flies on the electric net 4 through the sliding motor 7, so as to avoid the trapped flies accumulating on the top of the sliding frame 12 when the sliding frame 12 is scraped, which will affect the cleaning of the sliding frame 12 and the brush plate 18.

[0043] Working principle: By fixing a connecting frame 2 on the top of the main frame 1, the main frame 1 can be conveniently hung through the connecting frame 2 during use, so that it is convenient to hang it at a high place, making it easier to trap mosquitoes and flies, and an insect bait tank 16 is fixedly connected to the middle position of the bottom of the main frame 1, and a plurality of nozzles 8 are fixedly connected to the outside of the insect bait tank 16 at the bottom of the main frame 1, so that carbon dioxide can be stored in the insect bait tank 16, and then the carbon dioxide stored in the insect bait tank 16 is released through the plurality of nozzles 8, so as to facilitate the main frame 1 to be hung at a high place, so as to attract mosquitoes and flies. The frame 1 is used to trap mosquitoes and flies by gas. At the same time, at the bottom of the main frame 1, located outside the electric grid 4, two sliding shafts 10 are symmetrically fixedly connected, so that the main frame 1 can be slidably connected to the sliding motor 7 and the connecting sleeve 11 through the two sliding shafts 10. The sliding motor 7 is electrically connected to the external power supply during use, and is slidably connected to a plurality of electric grids 4. Two connecting rods 15 are symmetrically fixedly connected to the side wall of the sliding frame 12, so that the sliding frame 12 is fixedly connected to the sliding motor 7 and the connecting sleeve 11 through the two connecting rods 15. The electric net 4 is connected so that after trapping mosquitoes and flies, when mosquitoes and flies are stuck on the electric net 4, the sliding motor 7 can be slid to drive the sliding frame 12 to lift and slide on the several electric nets 4, so that the mosquitoes and flies stuck on the several electric nets 4 can be scraped off by the sliding sliding frame 12, and the connecting sleeve 11 can assist the sliding motor 7 to stably lift and slide, so as to facilitate the sliding frame 12 to clean the mosquitoes and flies stuck on the electric net 4, thereby preventing the mosquitoes and flies stuck on the electric net 4 from affecting the trapping function of the electric net 4, and secondly, the mosquitoes and flies stuck on the several electric nets 4 After the mosquitoes and flies are trapped, when the power grid 4 needs to be cleaned, the insect bait tank 16 and the insect trap lamp 14 are first turned off, and the fan 13 is started to discharge strong wind through a plurality of exhaust ports 9 to blow away the carbon dioxide emitted by the nozzle 8 in the main frame 1 and the mosquitoes and flies that have not been trapped. Then, the sliding motor 7 drives the sliding frame 12 and the brush plate 18 to lift and scrape the trapped mosquitoes and flies on the power grid 4, so as to avoid the accumulation of trapped mosquitoes and flies on the top of the sliding frame 12 when the sliding frame 12 is scraped, which affects the cleaning of the sliding frame 12 and the brush plate 18.

[0044] The embodiments of the present invention are provided for the purpose of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations of the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

[0045] A few final points should be made:

[0046] First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two elements, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change.

[0047] Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0048] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0049] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A mosquito and fly trapping device, characterized in that: include: The main frame (1) and the connecting frame (2) are used to connect and support the mosquito and fly trapping device; A trapping mechanism, fixedly arranged at the bottom of the main frame (1), for trapping mosquitoes and flies; A cleaning mechanism is slidably arranged at the bottom of the main frame (1) and is used for cleaning mosquitoes and flies after being trapped; The collecting mechanism is fixedly arranged at the bottom of the trapping mechanism and is used to store the trapped mosquitoes and flies; The interference mechanism is fixedly arranged in the main frame (1) and is used for mosquito and fly trapping interference.

2. A mosquito and fly trapping device as claimed in claim 1, characterized in that: The trapping mechanism comprises an insect bait pot (16) fixedly arranged at the middle position of the bottom of the main frame (1), and an insect attracting lamp (14) is fixedly arranged at the bottom of the insect bait pot (16); The bottom of the main frame (1) is located at the side of the insect bait tank (16), and is fixedly provided with a plurality of spray heads (8), and the spray heads (8) are connected to the insect bait tank (16).

3. A mosquito and fly trapping device as claimed in claim 2, characterized in that: The trapping mechanism further comprises a plurality of electric nets (4) fixedly arranged at the bottom of the main frame (1) and located outside the insect bait tank (16), and the plurality of electric nets (4) are distributed in a ring shape at equal distances; A plurality of guardrails (3) are fixedly arranged at the bottom of the main frame (1) and outside the plurality of electric grids (4).

4. A mosquito and fly trapping device as claimed in claim 1, characterized in that: The cleaning mechanism comprises two sliding shafts (10) symmetrically fixedly arranged at the bottom of the main frame (1) between a plurality of electric grids (4) and a guardrail (3); the main frame (1) is slidably provided with a sliding motor (7) and a connecting sliding sleeve (11) respectively via the two sliding shafts (10); A sliding frame (12) is slidably arranged on a plurality of power grids (4), two connecting rods (15) are symmetrically fixedly arranged on the side wall of the sliding frame (12), and the sliding frame (12) is respectively fixedly arranged with the sliding motor (7) and the connecting sleeve (11) through the two connecting rods (15).

5. A mosquito and fly trapping device as claimed in claim 4, characterized in that: The cleaning mechanism further comprises a brush plate (18) screwed to the bottom of the sliding frame (12); the sliding frame (12) and the brush plate (18) are both provided with a plurality of communication holes (21); and the electric grid (4) passes through the sliding frame (12) and the brush plate (18) through the communication holes (21); A mounting groove (19) is provided at the bottom of the sliding frame (12), a mounting ring (20) is fixedly provided at the top of the brush plate (18), and the mounting groove (19) and the mounting ring (20) are screwed together.

6. A mosquito and fly trapping device as claimed in claim 1, characterized in that: The collecting mechanism comprises a receiving frame (5) fixedly arranged at the bottom of a plurality of guardrails (3), and a collecting box (6) is screwed on the bottom of the receiving frame (5).

7. A mosquito and fly trapping device as claimed in claim 1, characterized in that: The interference mechanism comprises a fan (13) fixedly arranged inside the main frame (1); a plurality of air exhaust ports (9) are provided at the top of the main frame (1); and a plurality of air inlets (22) are provided at the bottom of the main frame (1).

8. A mosquito and fly trapping device as claimed in claim 7, characterized in that: The interference mechanism also includes a protective net (17) fixedly arranged on the air outlet (9) and the air inlet (22) at the top and bottom of the main frame (1).