CN202940568U - Anti-electric shock device for advertising boards in rainy days - Google Patents

Abstract

The utility model discloses an anti-electric shock device for advertising boards in rainy days. The anti-electric shock device comprises a control unit, a power supply switching unit, a rain sensor and a rainfall metering unit. Signal output ends of the rain sensor and the rainfall metering unit are connected with a control input end of the control unit and a control output end of the control unit is in control connection with the power supply switching unit. The power supply switching unit comprises a storage battery and a relay main contact switch, wherein the relay main contact switch is serially connected in a power supply loop of an advertising board light fixture, and the storage battery is connected in parallel between the advertising board light fixture and the relay main contact switch. The anti-electric shock device for advertising boards in rainy days automatically turns on and off a light fixture power based on the rainfall, effectively ensures safety when people are close to the advertising boards, and prevents electric shock accidents; and the power supply switching unit can turn off the power of the advertising board light fixture, and the control unit of the anti-electric shock device for advertising boards in rainy days is powered by the storage battery after the rain.

Description

A kind of rainy day billboard anti-electric shock apparatus

Technical field

The utility model belongs to rainy day protection against electric shock technical field, is specifically related to a kind of rainy day billboard anti-electric shock apparatus.

Background technology

For billboard electric leakage event; really there is electric leakage through test pencil test advertisements board; because rained heavily the same day; ponding covers the interface of this billboard; insulate bad, the iron sheet conduction of billboard, simultaneously; earth leakage protective device can not be realized earth leakage protective effectively, can cause billboard that electric leakage causing death accident occurs.In about 9 o'clock evening on the 7th of April in 2012, Haikou meets with heavy showers and attacks, and a billboard near the bus station, the jewel square Hotspring Hotel of prosperous source, Haikou City Hai Xiu East Road leaks electricity, and causes a man who passes by get an electric shock and die.Therefore, a kind of rainy day billboard anti-electric shock apparatus is set at the billboard place and just seems particularly important, but also do not have in the market relevant product to occur.

The utility model content

The purpose of this utility model is to provide a kind of rainy day billboard anti-electric shock apparatus, the problem that causes the billboard electric leakage to be hurted sb.'s feelings to solve existing billboard unprotect measure.

In order to realize above purpose, the technical scheme of the rainy day billboard anti-electric shock apparatus that the utility model provides is as follows: a kind of rainy day billboard anti-electric shock apparatus, comprise control unit, the electrical source exchange unit, reach the rain sensor whether rainy for perception and the rainfall metering units that rainfall is measured, the signal output part of described rain sensor and rainfall metering units is connected with the control input end of control unit, the control output end of control unit is connected with the electrical source exchange unit controls, described electrical source exchange unit comprises storage battery and for being serially connected in a relay main contacts switch of billboard light fixture current supply circuit, described storage battery is for being attempted by between billboard light fixture and relay main contacts switch, and storage battery supplies to be electrically connected to control unit, the control output end control connection of described relay and control unit.

Described rainfall metering units comprises the straight tube that liquid level sensor, funnel and the funnel bottom for liquid height is measured is connected, described liquid level sensor is installed on the setting height place of straight tube inside, and the signal output part of liquid level sensor is connected with the signal input part of control unit.

This device also is provided with acousto-optic warning unit, described acousto-optic warning unit and control unit control connection.

Whether rainy day billboard anti-electric shock apparatus of the present utility model rains by the rain sensor perception, and automatically open and close the light fixture power supply in billboard according to the rainfall size, effectively guarantee people's safety near billboard the time, reached the generation of protection against electric shock accident; The electrical source exchange unit carries out power switching under the control of control unit, can close the power supply of billboard light fixture, and the control unit of rainy day billboard anti-electric shock apparatus after raining by storage battery power supply.This apparatus structure is simple and reliable, stable performance.

The arranging of acousto-optic warning unit can realize perceiving while raining when rain sensor, reminds passing citizen away from billboard, to avoid Danger Electric shock risk, has safety precaution function.

The accompanying drawing explanation

The theory diagram that Fig. 1 is the utility model rainy day billboard anti-electric shock apparatus;

The schematic diagram that Fig. 2 is the electrical source exchange unit;

The structure chart that Fig. 3 is the rainfall metering units.

Embodiment

As shown in Figure 1, the utility model rainy day billboard anti-electric shock apparatus comprises that control unit, electrical source exchange unit reach the rain sensor whether rainy for perception and the rainfall metering units that rainfall is measured, the signal output part of rain sensor and rainfall metering units is connected with the control input end of control unit, and the control output end of control unit is connected with the electrical source exchange unit controls; As shown in Figure 2, the electrical source exchange unit comprises storage battery and for being serially connected in a solid-state relay main contacts K switch M1 of billboard light fixture current supply circuit, storage battery is for being attempted by between billboard light fixture and relay main contacts switch, and storage battery supplies to be electrically connected to control unit, the control output end control connection of relay and control unit.

The civil power of the 220V of electrical source exchange unit charges a battery by transformer, after rainfall reaches the preset value of control unit software, automatically cut off solid-state relay KM1 main contacts, to prevent the generation of electric shock accidents, now the power supply of control unit is supplied with is provided by storage battery.

The rainfall metering units comprises the straight tube that liquid level sensor, funnel and the funnel bottom for the rainfall height is measured is connected, and liquid level sensor is installed on the setting height place of straight tube inside, and the top of funnel is provided with upper cover, and aperture is left in the straight tube bottom.In the present embodiment, liquid level sensor adopts ultrasonic water level sensor, be installed in the hole in Fig. 3 support 2, and make to be tightened by bolts, and the signal output part of liquid level sensor is connected with the signal input part of control unit.Liquid level sensor is measured the height h of rainfall metering units moderate rain quantity of fluid, height h by rainfall in straight tube and the value of time t, can extrapolate rainfall ω according to following formula, after the rainfall preset value that reaches software, control unit completes the function of billboard deenergization.

In the present embodiment in the rainfall metering units between rainfall ω and h, t relation calculate that process is as follows: t drops to the rainfall ω (cm/h) of funnel in the time, suppose L ₁=20cm, L ₂=4cm, L ₃=0.5cm.

$\mathrm{\π}\×{\left(\frac{20}{2}\right)}^2\×t\×\mathrm{\ω}$

Height h while dropping to cylindrical cup ₀

$h_0=\frac{\mathrm{\π}\×{\left(\frac{20}{2}\right)}^2\×t\×\mathrm{\ω}}{\mathrm{\π}\×\left(\frac{4}{2}\right)}=\frac{100\×t\×\mathrm{\ω}}{4}=25\mathrm{t\ω}$

Because there is aperture L in the cylindrical cup bottom ₃=0.5cm, g is acceleration of gravity, according to Bernoulli equation, the flow velocity of aperture while highly being h $v=\sqrt{2\mathrm{gh}}=\sqrt{2g\×25\mathrm{t\ω}}=\sqrt{50\mathrm{gt\ω}}$

The rain flow (volume) of aperture t time

$\mathrm{vts}=\sqrt{50\mathrm{gt\ω}}\×t\×\mathrm{\π}\×{\left(\frac{0.5}{2}\right)}^2=\sqrt{50\mathrm{gt\ω}}\×t\×\mathrm{\π}\×{0.25}^2$

The sectional area that wherein s is aperture.

Actual height $h=\frac{\mathrm{\π}\×{\left(\frac{20}{2}\right)}^2\×t\×\mathrm{\ω}-\sqrt{50\mathrm{gt\ω}}\×t\×\mathrm{\π}\×{\left(0.25\right)}^2}{\mathrm{\π}{\left(\frac{4}{2}\right)}^2}$

By above-mentioned relation, arrange ${\mathrm{\ω}}^2-(\frac{2h}{25t}+\frac{\mathrm{gt}}{{25}^2\×64\×32})\mathrm{\ω}+\frac{h^2}{{25}^2{t}^2}=0$

Rainfall ω=f (h, t), if in t measures straight tube in the time height h of rainfall, just can extrapolate the rainfall size.

In addition, in order further to guarantee the safety of personnel under billboard, it is reminded, this device also is provided with acousto-optic warning unit, acousto-optic warning unit and control unit control connection.

The control unit of the present embodiment adopts the AT89C52 single-chip microcomputer, for gathering the signal of rain sensor, liquid level sensor, and after treatment, the electrical source exchange unit is controlled.Whether rain sensor adopts the ir scattering rain sensor, for perception, rain.

The utility model rainy day course of work of billboard anti-electric shock apparatus is as follows: after rain sensor perceives and rains, time delay 10s open the upper cover 1(of rainfall metering units in Fig. 3 when flat upper cover 1 in closure state, enter the rainfall metering units to prevent controlling airborne impurity), liquid level sensor in the rainfall metering units starts to measure the height of rainfall, in addition, the timer of control unit is opened, single-chip microcomputer starts timing, the value of t when obtaining calculating rainfall, while guaranteeing to rain, metering units can be measured smoothly; After the rainfall preset value that reaches software, trigger the acousto-optic warning unit of single-chip microcomputer, remind citizen away from billboard, with protection against electric shock, automatically cut off solid-state relay KM1 main contacts, to prevent the generation of electric shock accidents, now the power supply of control unit is supplied with is provided by storage battery simultaneously.

When rain sensor detects the rain stopping time, the upper cover 1 of rainfall metering units in the closed Fig. 3 of time delay 10s, and close the acousto-optic warning unit of single-chip microcomputer, remove sound and light alarm.In addition, closed solid-state relay KM1 main contacts, (but the advertisement screen power supply will be subject to the impact of municipal power-on time, and this device is realized the closed of power supply or opens during just to the rainy day) switches on power.

Claims (4)

1. a rainy day billboard anti-electric shock apparatus, it is characterized in that: comprise control unit, the electrical source exchange unit, reach the rain sensor whether rainy for perception and the rainfall metering units that rainfall is measured, the signal output part of described rain sensor and rainfall metering units is connected with the control input end of control unit, the control output end of control unit is connected with the electrical source exchange unit controls, described electrical source exchange unit comprises storage battery and for being serially connected in a relay main contacts switch of billboard light fixture current supply circuit, described storage battery is for being attempted by between billboard light fixture and relay main contacts switch, and storage battery supplies to be electrically connected to control unit, the control output end control connection of described relay and control unit.

2. rainy day billboard anti-electric shock apparatus according to claim 1, it is characterized in that: described rainfall metering units comprises the straight tube that liquid level sensor, funnel and the funnel bottom for liquid height is measured is connected, described liquid level sensor is installed on the setting height place of straight tube inside, and the signal output part of liquid level sensor is connected with the signal input part of control unit.

3. rainy day billboard anti-electric shock apparatus according to claim 1 and 2, it is characterized in that: this device also is provided with acousto-optic warning unit, described acousto-optic warning unit and control unit control connection.

4. rainy day billboard anti-electric shock apparatus according to claim 3, it is characterized in that: the top of described funnel is provided with upper cover, and aperture is left in the straight tube bottom.

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