CN2204488Y - Supersonic mosquito banishing device - Google Patents

Abstract

The utility model relates to a supersonic wave mosquito banishing device, particularly a harmless supersonic wave mosquito banishing device for a human body. The supersonic wave mosquito banishing device comprises an oscillating circuit and an electricity and sound converting element and is characterized in that the frequency range of the supersonic wave generated by the oscillating circuit is 2.8-5 K Hz. The supersonic wave mosquito banishing device can rapidity banish all the mosquitoes and ensure that the human body is not infested by the mosquito within surrounding 16 square meters.

Description

Supersonic mosquito banishing device

The utility model relates to a kind of ultrasonic mosquito expelling equipment, especially a kind of harmless ultrasonic mosquito expelling equipment.

Existing ultrasonic mosquito expelling equipment mainly is to produce the ultrasonic of killing mosquito by the signal that oscillating circuit produces through amplification rear drive electroacoustic conversion elements to reach the mosquito repellent purpose, harmless in order to accomplish, the frequency range of being got at present is 5KHz～9KHz or 20KHz～65KHz, but it is not very good to find to use the ultrasonic mosquito expelling equipment repelling effect of these two kinds of frequency ranges in actual applications, can not in time drive away the mosquito of all kinds, guarantee that human body is not subjected to the invasion of mosquito.

For this reason, the purpose of this utility model is to overcome the deficiency of above-mentioned prior art, and a kind of ultrasonic mosquito expelling equipment is provided, and the frequency range that it produced is 2.8～5KHz, it can drive away all mosquitoes at short notice, guarantee human body around 16 square metres not invaded and harassed by mosquito with interior.

The technical scheme that realizes the utility model purpose is a kind of ultrasonic mosquito expelling equipment, comprises oscillating circuit and electroacoustic conversion elements, and its special character is that the ultrasonic frequency scope that oscillating circuit produced is 2.8～5KHz.

And, oscillating circuit adopts the two poles of the earth cascode Resistance and Capacitance Coupled Amplification Circuit, triode BG1 base stage wherein links to each other with positive source by resistance R 1, simultaneously through being connected to the colelctor electrode of triode BG2 after the capacitor C 1, and through being connected with positive source after the resistance R 4, capacitor C 2 one ends are connected with triode BG1 colelctor electrode in the circuit, and be connected to positive source after the process resistance R 2, capacitor C 2 other ends link to each other with the base stage of triode BG2, and being connected to positive source after the process resistance R 3, the emitter stage of triode BG1, BG2 directly links to each other with power cathode respectively.

And the R1 span is 1～1.8K Ω in the circuit, and the R2 span is 5.6～10K Ω, R3 span 2.7～4.5K Ω, and the R4 span is 18～22K Ω, and the C1 span is 5600PF～0.1 μ F, and the C2 span is 0.022～0.047 μ F.

All has hyperacoustic characteristic of fearing CF according to different types of mosquito, and all kinds of mosquitoes all have the characteristics of fearing the ultrasonic frequency that bat sends, through a large amount of tests, the utility model has been chosen the frequency band of scope between 2.8～5KHz, this band frequency is not only harmless, and the different CFs that all kinds of mosquito feared have been consisted essentially of, frequency range is narrower again, so just, guaranteed repelling effect preferably, reach drive away all mosquitoes at short notice and make human body around 16 square metres with the interior purpose that not invaded and harassed by mosquito.

The utility model is described in further detail below with reference to accompanying drawing.

Accompanying drawing is the circuit diagram of the utility model embodiment.

As seen from the figure, oscillating circuit 1 is connected to form from beginning to end by two-stage cascode resistance capacity coupled amplifier among this embodiment, forms the closed hoop of positive feedback.

When connecting switch 4, the collector current of BG1 increases slightly, then the BG1 collector voltage reduces, the BG1 collector voltage of this variation is coupled to the BG2 base stage by C2, the BG2 base voltage is reduced, cause that the BG2 collector current descends, voltage rises, be coupled to the BG1 base stage by C2, the BG1 base voltage is risen, cause that again the collector current of BG1 increases, form strong positive feedback process, cause BG1 very fast saturated, BG2 ends, (the charge circuit: a C2 left side → BG1 ［ b, e ］ → ground → power supply → R4 → C2 right side) of C2 charging at this moment, the original polarity of voltage of C1 is that a left side is positive right negative, because of BG1 is saturated, C1 will discharge, (discharge loop: a C1 left side → BG1 ［ c, e ］ → ground → R3 → C1 right side), after the C1 discharge BG2 base voltage is risen gradually to power supply 5 forward voltage values, when the base voltage of BG2 reached 0.6V, BG2 is conducting once more, produce a positive feedback process, BG2 is saturated rapidly as a result, and BG1 ends rapidly, C1 charging in the meantime, the C2 discharge, the base voltage of BG1 is risen to power supply 5 forward voltage values gradually by negative potential, and when it rose to 0.6V, BG1 is saturation conduction once more, BG2 ends, and finishes a cycle of oscillation.Because capacitor C1, C2 alternately constantly charge and discharge make BG1, BG2 just alternately constantly by or saturated, so ceaselessly upset, generation self-oscillation.On BG1, BG2 colelctor electrode, just can obtain rectangular pulse output, by available high tone quality loudspeaker in the electroacoustic conversion elements 2(present embodiment) send the ultrasonic of repel mosquitoes, in order to make ultrasonic frequency in 2.8～5KHz scope, the span of R1 in the present embodiment, R2, R3, R4 is respectively: 1～1.8K Ω, 5.6～10K Ω, 2.7～4.5K Ω, 18～22K Ω, the span of capacitor C 1, C2 is respectively 5600PF～0.1 μ F, 0.022 μ F～0.047 μ F, also be provided with adjustable resistor 3 in the circuit, be used for finely tuning volume, frequency.

Claims (3)

1, a kind of ultrasonic mosquito expelling equipment, especially a kind of harmless ultrasonic mosquito expelling equipment comprises oscillating circuit [1] and electroacoustic conversion elements [2], it is characterized in that: the ultrasonic frequency scope that oscillating circuit [1] is produced is 2.8～5KHz.

2, ultrasonic mosquito expelling equipment according to claim 1, it is characterized in that: the oscillating circuit in the mosquito expeller circuit ［ 1 ］ adopts the two poles of the earth cascode Resistance and Capacitance Coupled Amplification Circuit, wherein triode BG1 base stage links to each other by resistance R 1 and power supply ［ 5 ］ are anodal, be connected to the colelctor electrode of triode BG2 simultaneously after the process capacitor C 1, and join with power supply ［ 5 ］ positive pole by resistance R 4 backs; Capacitor C 2 one is terminated at the colelctor electrode of triode BG1 in the circuit, and is connected to power supply ［ 5 ］ positive pole through behind the R2, and capacitor C 2 other ends link to each other with the base stage of triode BG2, and by being connected to power supply ［ 5 ］ positive pole after the resistance R 3; The emitter stage of triode BG1, BG2 directly links to each other with power supply ［ 5 ］ negative pole respectively.

3, ultrasonic mosquito expelling equipment according to claim 2, it is characterized in that: the R1 span is 1～1.8K Ω in the circuit, the R2 span is 5.6～10K Ω, the R3 span is 2.7～4.5K Ω, the R4 span is 18～22K Ω, the C1 span is 5600PF～0.1 μ F, and the C2 span is 0.022 μ F～0.047 μ F.

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