CN2068252U

CN2068252U - Automatic control unit for liquid level

Info

Publication number: CN2068252U
Application number: CN 90200789
Authority: CN
Inventors: 廖汉成
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-01-17
Filing date: 1990-01-17
Publication date: 1990-12-26

Abstract

The utility model relates to an automatic control unit for liquid level, comprising a bistable circuit, a control circuit, a power circuit, four inductive probes, a plastic rod, a casing, etc. Because of the use of matching of the bistable circuit provided with the upper steady and the lower steady and the four inductive probes fixed on the plastic rod, the utility model can not be limited by the time. The pump water can not be supplied until the water is discharged to the lowest limited position. The utility model has the advantages of reasonable structure, simple circuit, low cost and high sensitivity. The utility model is applicable to the liquid level automatic control of the instrument with high precision in the hygiene and the pharmacy industry and is also used in the liquid level automatic control in the common household water pump.

Description

Automatic control unit for liquid level

The utility model relates to a kind of controller, particularly a kind of automatic control of liquid device.

In the prior art, fluid level controller generally all adopts mechanical float-ball type.This kind controller precision is low, and structure falls behind, and action sensitivity is poor.A kind of " biliquid position self-actuated controller " disclosed in the Chinese patent (patent No. 88218624.8).It can realize automatic control of liquid to water system, and has electromotor overload, underloading and phase failure protection function.But its circuit, structure are all complicated, the cost height.

The purpose of this utility model is to avoid above-mentioned the deficiencies in the prior art part and a kind of control accuracy height, simple, the lower-cost automatic control of liquid device of circuit is provided.

The purpose of this utility model can reach by following measure:

The utility model is made up of bistable circuit, control circuit, power circuit, four inductive probe A, B, C, D, shells, it is characterized in that: in the bistable circuit 2 of IC1,6 pin link to each other and and potentiometer W2, inductive probe C, D join, 4,8 pin connect power supply and meet inductive probe A, B by potentiometer W1, the coil of 3 pin connection control circuit repeat circuit J, 1 pin ground connection.Inductive probe A, B, C, D are made by four copper sheets, and probe A, B and C, D are separately fixed on two plastics, connect with lead between A, the B and between C, the D.Be connected to capacitor C 2 between 2 of IC1,6 pin and the ground in the bistable circuit.

Fig. 1 is a functional-block diagram of the present utility model;

Fig. 2 is an electrical schematic diagram of the present utility model;

Fig. 3 is the structural representation of inductive probe.

The utility model is described in further detail below in conjunction with accompanying drawing (embodiment):

With reference to Fig. 1, Fig. 3, the utility model is made up of bistable circuit 1, control circuit 2, power circuit 3, four inductive probe A, B, C, D, sticking plaster 4, shells.Connect with lead between inductive probe A, the B and between C, the D.

With reference to Fig. 2, bistable circuit 1 is made up of IC1, potentiometer W1, W2, C2 pilot lamp L; Control circuit 2 is made up of diode D1, relay J, and power circuit 3 is made up of three terminal regulator IC2, transformer B, rectifier bridge Z, capacitor C 1.

Two sticking plasters that are fixed with probe A, B and C, D are mutually near (be that probe A, C are mutually close, B, D are mutually close), and A, C are upper limit, and B, D are lower limit.When water is raised to most significant digit, four probes all contact with water, the area maximum, resistance is minimum, and g, h point is near short circuit, and power supply Ec arrives ground by W1, probe A, C and B, D, W2,2 pin (g point) dividing potential drops very high (being higher than 2/3Ec) at IC1, trigger the last steady operation of bistable circuit, the IC1 upset makes relay J become release from adhesive.Because of J contact J1-1 be serially connected with power input, so can be just closing at the motor of pump water.When water is bled off, when the water surface was lower than B, D position, four probes surfaced, and resistance is very big, and g, h point is near open circuit, and the 2 pin current potentials of IC1 are lower than 1/3Ec, triggered the following steady operation of bistable circuit, the IC1 upset, and J transfers attracting state again to, starting of pump station pump water.Like this, by to the reasonable installation of probe A, B and C, D and cooperate and adjust potentiometer W1, W2, just can obtain satisfied control effect, other also can connect capacitor C 2 between 2 pin of IC1 and ground.Its effect is: as having a power failure in pump water process, then owing to the energy storage effect of C2, can keep the state of IC1, though motor cuts off the power supply, relay J is adhesive still.When sending a telegram here again, can make water pump continue pump water till the peak level.When C2 not, as in pump water process, having a power failure, circuit dead electricity then, IC1 enters another stable state, and J discharges, and water pump quits work.At this moment as again incoming call, because of IC1 overturns, J can adhesive, and water pump can make-up pump water.Have only when putting water to lowest water level again and just can rework, it is luminous when pump water that other is connected on 7 pin and the pilot lamp L between the power supply of IC1, indication pump water state.

Civil power provides direct supply Ec for circuit through transformer B step-down after current stabilization bridge Z rectification, capacitor C 1 filtering, the IC2 voltage stabilizing.

The utility model has following advantage compared to existing technology:

1. be not subjected to time restriction, as long as mix up spacing, just can realize high precision in control, And can put water to minimum spacing rear ability make-up pump water.

2. rational in infrastructure, circuit is simple, and cost is low, and is highly sensitive, is applicable to the liquid level control of high precision instrument in modern health, the pharmaceuticals industry, is applicable to that also the average family water pump makes liquid automatic control.

Claims

1, a kind of automatic control of liquid device, form by bistable circuit 1, control circuit 2, power circuit 3, four inductive probe A, B, C, D, shells, it is characterized in that: in the bistable circuit 12 of IC1,6 pin link to each other and and potentiometer W2, inductive probe C, D join, 4,8 pin connect power supply and meet inductive probe A, B by potentiometer W1, the coil of 3 pin connection control circuits, 2 repeat circuit J, 1 pin ground connection.

2, controller according to claim 1 is characterized in that: inductive probe A, B, C, D are made by four copper sheets, and probe A, B and C, D are separately fixed on two sticking plasters 4, connect with lead between A, the B and between C, the D.

3, controller according to claim 1 is characterized in that: be connected to capacitor C 2 between 2 of IC1,6 pin and the ground in the bistable circuit.