CN102758783A

CN102758783A - Finger touch protection fan

Info

Publication number: CN102758783A
Application number: CN2011101156189A
Authority: CN
Inventors: 郭炜斌
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-04-26
Filing date: 2011-04-26
Publication date: 2012-10-31

Abstract

Electric fans on the current market are generally provided with guards to prevent fan wings rotating at high speed from scratching a human body. But gaps of the guards of most of fans are wider, and if a child curiously puts fingers (or some fine hard objects) into the gaps of the guards, the consequence is unimaginable. According to the finger touch protection fan, a finger touch protection circuit is additionally arranged on the basis of a normal fan; when the human body touches the guard of the fan, the fan stops running; and when the human body gets away from the guard, the fan automatically restores to operate, so that the safety protection performance of the fan is enhanced.

Description

Refer to touch the protection fan

Technical field

The present invention relates to a kind of electric fan, specifically is a kind of fan that can prevent that child from being scratched by the wind wing because finger is put in fan screen to curiosity.

Background technique

Present electric fan on the market generally all has guard, prevents that the wind wing of high-speed rotation from scratching human body.But the guard spaced slot of most of fans puts in the spaced slot of guard if child will point (or some tiny hard things) because of curiosity than broad, and consequence is with hardly imaginable.

Summary of the invention

In order to solve the deficiency of above electric fan, the invention provides and a kind ofly can prevent that child from pointing the fingertip protection fan that is scratched by the wind wing.

The present invention is achieved in that

In circuit, the VDC of control circuit is changed Ac by rectifier to be provided, the input resistance that triode VT1 improves circuit as inductor, and it is the core of circuit that 555IC and peripheral Resistor-Capacitor Unit are formed trigger; Triode VT2 is a power amplifier, for relay provides driving current.

When human body did not contact guard, relay was reactionless, and its normally-closed contact is connected ac power supply, and fan runs well.When human body touched guard, relay engaged, and normally-closed contact breaks off, and normally opened contact is closed, and Ac becomes direct current suddenly and carries out dynamic braking, and fan runs out of steam.Through delay circuit, fan continues to connect Ac again and resumes work after human body leaves.

Benefit of the present invention has been to increase the Safety performance of fan, and easy to use.

Description of drawings

Below in conjunction with accompanying drawing the present invention is described further:

Electric fan is on the basis of conventional fan, to install a fingertip protective circuit additional among the figure, and when human body touched fan screen, fan shut down; When human body left guard, fan recovered running automatically.

Embodiment

In circuit, the VDC of control circuit is changed Ac by rectifier to be provided, and 1. triode VT1 improves the input resistance of circuit as inductor, 555IC 2. and peripheral Resistor-Capacitor Unit to form trigger be the core of circuit; 3. triode VT2 is power amplifier, for 6. relay J provides driving current.

When human body did not contact guard, VT1 base stage 1. was that low level is in cut-off state, integrated the 3rd pin output low level 2. of IC, and 3. VT2 ends, and relay J is 6. reactionless, and its normally-closed contact is connected ac power supply, and fan runs well.When human body touched guard, 4. the static that human body itself leaks injected 1. base stage of VT1 through protective resistance R4, after amplifying; Trigger intergrated circuit, 3 pin output high level makes 3. conducting of VT2; 6. relay J engages, and normally-closed contact breaks off, and normally opened contact is closed; Receive

resistance R

5 and 5. hold, Ac becomes direct current suddenly and carries out dynamic braking, and fan runs out of steam.Through delay circuit, fan continues to connect Ac again and resumes work after human body leaves.

Claims

1. a finger touches the protection fan, and it is on the basis of conventional fan, to increase a finger to touch protective circuit.When human body touched fan screen, fan shut down; When human body left guard, fan recovered running automatically, can prevent child because scratched by the wind wing in the curious grid that finger is put in fan guard.

2. touch the protection fan according to claims 1 described finger; It is characterized in that; In circuit; The VDC of control circuit is changed Ac by rectifier to be provided, the input resistance that triode VT1 improves circuit as inductor, and it is the core of circuit that 555IC and peripheral Resistor-Capacitor Unit are formed trigger; Triode VT2 is a power amplifier, for relay provides driving current.

When human body did not contact guard, the base stage of VT1 was that low level is in cut-off state, the 3rd pin output low level that IC is integrated, and VT2 ends, and relay is reactionless, and its normally-closed contact is connected ac power supply, and fan runs well.When human body touched guard, the static that human body itself leaks injected the VT1 base stage through protective resistance R4, after amplifying; Trigger intergrated circuit, 3 pin output high level makes the VT2 conducting; Relay engages, and normally-closed contact breaks off, and normally opened contact is closed; Receive resistance R 5 ends, Ac becomes direct current suddenly and carries out dynamic braking, and fan runs out of steam.Through delay circuit, fan continues to connect Ac again and resumes work after human body leaves.