CN87206858U - Water level controller with high impedance and AC electrode - Google Patents

Abstract

The utility model relates to a water level controller with the high impedance and AC electrode. The signal current flowing across the electrode water junction is AC from a few microamperes to a few milliamperes, the signal current are converted into the DC signal current through a rectifier or an operational amplifier, and then the signal current passes through a DC amplifying circuit to propel an actuating device to realize the purpose of automatic control.

Description

Water level controller with high impedance and AC electrode

Technical field under the utility model.

The utility model is a kind of electric autocontrol device that is used for automatic loading water or automatic drain system control water level.

The prior art background

Five, the sixties, early stage what use was a kind of water level controller of float-ball type mechanical action, because volume is big, was easy to malfunctioningly, damage and be eliminated gradually.

2. the initial stage in the sixties is along with transistor circuit is applied in China, begin to occur a kind of DC electrode formula water level controller, though this quasi-controller has volume little, simple in structure, advantages such as low price, but because DC electrode has electrolytic action to conductive ion in the water, use with the passing of time, electrode surface just can cover one deck incrustation scale and resistance is increased, thereby reduces reliable in action, thereby also unsalable day by day on market.

3. the capacitance type liquid level controller utilizes the liquid level lifting and changes the principle that is affixed on the conduit outer wall interelectrode capacity, makes to be connected between electric bridge the actuating of relay and to be controlled liquid level.This fluid level controller, structure are complicated, and price is more expensive, and the used measuring resistance of electric bridge, electric capacity, use day long afterwards parameter change slightly, just can influence reliable in action, so also do not applied.

4. reed switch formula fluid level controller: utilize the magnet steel that is contained on the float to move, make the folding of reed relay contact and reach the purpose of controlling liquid level with the liquid level lifting.This type of controller architecture principle is simple, and price is also inexpensive.But magnet steel is a permanent magnetic material, and with the passing of time magnetic can go down, and influences its reliable in action.

5. Low ESR ac electrode formula water level controller: its principle is to pass through electrode, water, rectifier and DC relay are in series, directly be connected to AC power, its advantage is can avoid influencing its conductance because of DC electrode generates incrustation scale to the electrolytic action of conductive ion in the water, its shortcoming is that the relay both end voltage is changed by resistivity of water and changes, the water resistance rate is crossed and low relay burnt too highly then can make the relay tripping, product with Liaoyang White Tower instrucment and meter plant is 1.83 to 4.9 times that its electrode water resistance permission variation range of example is about the relay impedance, therefore, sort controller is relatively poor for the adaptability of change of water quality in actual use.

The purpose of this utility model

For obtain a kind of can prevent DC electrode formula water level controller electrode easily scale and make control malfunctioning, can avoid the shortcoming of Low ESR ac electrode formula water level controller again to the change of water quality bad adaptability, have the inexpensive of both advantages concurrently, practicality, reliable novel water level controller.Content of the present utility model

The principle wiring of this device comprises four elements---power transformer (B), electrode water contact (DJ), silicon rectification bridge (GQ, GQ) and direct current amplify, executive circuit.This device to principal feature is: electrode water contact DJ is connected on power transformer and pays between limit and the silicon rectifier body (exclusive disjunction amplifier) and to amplify executive circuit in the alternating circuit and still be direct current, the water power resistance allows up to 1.5 megaohms between electrode like this, the electric current of electrode of flowing through is minimum to be just can guarantee the relay action message by microampere order.

Specifically, two kinds of embodiment are arranged:

First kind of embodiment is shown in accompanying drawing 1.Direct current amplifies, and the loop adopts the transistor triode to amplify the rear drive executive circuit---DC relay J action.

Second kind of embodiment, as shown in Figure 2, its direct current amplifying return circuit amplifies the rear drive executive circuit through one-level operational amplifier and three grades of transistors---the DC relay action.

The operating condition table of accompanying drawing 1,2:

1. the duty of each point output and J in the accompanying drawing 1,2 when going up water.

Operating mode electrode electrode touches water state A B C D J

The water surface 0110 adhesives are left in last water starting 1 and 2

Last water termination of pumping 1 contacts the water surface 1001 and discharges with 3

Annotate: 1. the transfer contact of J is positioned at normally closed position when going up the water startup

2. the transfer contact of J is positioned at the normally open position when going up the water termination of pumping

3.0 be zero potential output, 1 for there being positive potential output

2. the duty of each point output and J in the accompanying drawing 1,2 during draining:

Operating mode electrode electrode touches water state A B C D J

Draining termination of pumping 1 and 2 is left the water surface 0111 and is discharged

Draining starting 1 contacts the water surface 1010 adhesives with 3

Annotate: 1. K switch moves on to drainage position, electrode 2,3 transpositions during draining

2. the transfer contact of J is positioned at the normally open position during draining termination of pumping

3. when draining started, the transfer contact of J was positioned at normally closed position

4. " 0 " is zero potential output, and " 1 " is for there being positive potential output.

Advantage of the present utility model:

Compare with existing various types of water level controllers, the utlity model has advantage simple in structure, cheap, reliable. Owing to be alternating current by electrode current, do not make the electrode fouling so can not resemble the effect of producing electrolysis the DC electrode formula water level controller, electric conductivity degenerates and controls malfunctioning. In addition, the current signal that flows through electrode promotes executive component after over commutation amplifies, as long as but several microamperes the just sensitive action of assurance device of current signal is arranged, thus allow water power resistance between electrode zero Europe to 1.5 megaohm on a large scale in variation. Require sternlyer and do not resemble the Low ESR ac electrode formula water level controller variation to water power resistance between electrode, cause easily tripping or burn the accidents such as relay.

Claims (1)

1. A kind of water level controller is characterized in that:

   1, electrode water contact DJ is connected on power transformer, pays between limit and the silicon rectification bridge (operational amplifier) in the alternating circuit, and amplify, executive circuit still is direct current,

   2, the direct current amplifying return circuit of first kind of embodiment adopts the driving topworks that transistor three utmost points amplify---DC relay J action,

   3, second kind of embodiment is that AC signal is amplified rear drive topworks through one-level operational amplifier and three grades of transistors---the DC relay action.

Images