CN202512450U

CN202512450U - Boiler water level measuring and controlling device

Info

Publication number: CN202512450U
Application number: CN2012200937792U
Authority: CN
Inventors: 张永林; 吴雄杰
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-03-14
Filing date: 2012-03-14
Publication date: 2012-10-31
Anticipated expiration: 2022-03-14

Abstract

The utility model relates to a boiler water level measuring and controlling device, comprising a water level detection circuit and a microprocessor control circuit. The output signal of the water level detection circuit is transmitted to the microprocessor control circuit via an oscillation circuit and a trigger circuit orderly, and the output signal of the microprocessor control circuit is controlled and transmitted to a 485 communication interface circuit and an alarm circuit; wherein the microprocessor control circuit is in bidirectional data communication with the trigger circuit and the 485 communication interface circuit. By employing a capacitor to detect a boiler internal water level signal, using an NE 555 time-base circuit and a relay to execute and control result, sending out a signal via the microprocessor, and transmitting the signal to a duty room via a 485 bus, the boiler water level measuring and controlling device of the utility model can be used for boiler water inlet or water tank water feeding, alarm and data remote transmission, and can remotely operate and control the water drawing of a water pump via a computer in the duty room.

Description

A kind of boiler water level measure and control device

Technical field

The utility model relates to a kind of water level measuring and controlling device, particularly be a kind of boiler water level measure and control device.

Background technology

Water-level control apparatus function singleness in the market only acts on the monitoring of self-alignment height, can not data remote, and the operated from a distance control of being unrealized starts water pump and draws water.

The utility model content

The purpose of the utility model is to overcome above-mentioned deficiency, and a kind of boiler water level measure and control device is provided.

The utility model solves the technical scheme that its technical matters adopted: a kind of boiler water level measure and control device; Comprise water level detection circuit and microprocessor control circuit; The output signal of said water level detection circuit transfers to microprocessor control circuit through oscillatory circuit, trigger circuit successively; The output signal controlling of said microprocessor control circuit is sent to 485 communication interface circuits and warning circuit, wherein microprocessor control circuit and trigger circuit, 485 communication interface circuit bidirectional data communications.

The capacitive transducer that said water level detection circuit adopts the capacitor C 1 of the two metal sheets a, b and the output terminal connection thereof that are installed in the water tank inner top side to constitute.

Two groups of coil L1 of the transformer B that the base stage of said oscillatory circuit employing transistor T 1 is connected with the emitter output terminal, the inductance connecting three point type circuit that L2 forms.

Said trigger circuit are made up of the relay that NE555 time base circuit IC1 and output terminal thereof connect.

The COM port that the output terminal of said 485 communication interface circuits through SN75176 communication interface chip IC3 is connected to the RS485 communication interface sends data message to PC.

Through adopting above-mentioned technical scheme; The beneficial effect of the utility model is: the utility model adopts capacitor to detect the boiler internal water level signal; Carry out the control result with NE555 time base circuit and relay; And send signal through microprocessor, and be sent to duty room through 485 buses, can be used for boiler feed water or water tower (water tank) and send water and warning and data remote; And can control drawing water of water pump, thereby solve the danger that prevents to cause the boiler water shortage blast because of boiler water shortage through the duty room computer remote.

Description of drawings

Fig. 1 is the frame assumption diagram of the utility model;

Fig. 2 is the circuit theory diagrams of the utility model.

Embodiment

Like Fig. 1, shown in Figure 2; A kind of boiler water level measure and control device of the utility model; Comprise water level detection circuit 1 and microprocessor control circuit 2; The output signal of said water level detection circuit 1 transfers to microprocessor control circuit 2 through oscillatory circuit 11, trigger circuit 12 successively; The output signal controlling of said microprocessor control circuit 2 is sent to 485 communication interface circuits 21 and warning circuit 22, wherein microprocessor control circuit 2 and trigger circuit 12,485 communication interface circuits 21 bidirectional data communications.

The capacitive transducer that said water level detection circuit 1 adopts the capacitor C 1 of the two metal sheets a, b and the output terminal connection thereof that are installed in the water tank inner top side to constitute; Two groups of coil L1 of the transformer B that the base stage of said oscillatory circuit 11 employing transistor Ts 1 is connected with the emitter output terminal, the inductance connecting three point type circuit that L2 forms; Said trigger circuit 12 are made up of the relay that NE555 time base circuit IC1 and output terminal thereof connect, and the COM port that the output terminal of said 485 communication interface circuits 21 through SN75176 communication interface chip IC3 is connected to the RS485 communication interface sends data message to PC.

The collector load of transistor T 1 is the elementary resonant tank that constitutes by capacitor C 3, transformer B1, and when capacitor C 1 centre is anhydrous (lack of water in the boiler water tank etc.), this LC loop Q value is high; Transistor T 1 starting of oscillation and concussion frequency are the natural frequency of collector loop; Then go out bigger high voltage at transformer B1 secondary induction and on resistance R 5, form DC voltage through diode D1 rectification, the 2nd, the 6 pin current potentials of NE555 time base circuit IC1 rise to more than the 4V, then the 3rd pin output low level of NE555 time base circuit IC1; Triode T2 is ended; Relay J discharges, and its normally opened contact still is in and breaks off still closure of JK2, JK3, JK4 normally closed contact, and three-phase electricity is added on the pump motor; Water pump starts to boiler or water tank and adds water; This moment, this signal also was low level through the 33rd pin I/O end that resistance R 8 current limlitings are input to microprocessor IC2, after microprocessor IC2 internal processes is judged because NE555 time base circuit IC1 exports low-potential signal; Form 485 communication interface circuits 21 by the 10th, 11,21 pin of microprocessor IC2 and SN75176 communication interface chip IC3, resistance R 10 etc.; After the 6th, the 7 data-signals conversion by SN75176 communication interface chip IC3, be connected to PC, show when status data information by PC through two buses.

When the artificial Long-distance Control water pump of needs draws water; Through operation PC system software; Warp 485 2 bus datas are sent to the communication ends of microprocessor IC2, after microprocessor IC2 internal processes is judged, by microprocessor IC2 the 35th pin output low-potential signal; Make the relay J adhesive, promote water pump and draw water.

When in the middle of the two metal sheets a, b water being arranged the water yields such as (enough) boilers, because the capacity of capacitor C 1 increases then Q value decline; Oscillation frequency descends, and failure of oscillation then reduces up to being zero the secondary output voltage of transformer B1; NE555 time base circuit IC1 the 2nd, 6 pin current potentials descend, NE555 time base circuit IC1 starting oscillation, and relay J transfers closure to by often opening; The low-potential signal of the 4th pin of microprocessor IC2 output simultaneously; Through resistance R 9 current limlitings, promote news Chinese percussion instrument BY and send alarm sound, remind the operator on duty.Simultaneously, the JK2-JK4 normally closed contact breaks off, and stops automatically drawing water to boiler water tank etc.

An above-described preferred embodiment that is merely the utility model can not limit the scope that the utility model is implemented, and every equalization of being done according to the utility model claim changes and decorates, and all should still belong in the scope that the utility model contains.

Claims

1. boiler water level measure and control device; It is characterized in that: comprise water level detection circuit (1) and microprocessor control circuit (2); The output signal of said water level detection circuit (1) transfers to microprocessor control circuit (2) through oscillatory circuit (11), trigger circuit (12) successively; The output signal controlling of said microprocessor control circuit (2) is sent to 485 communication interface circuits (21) and warning circuit (22), wherein microprocessor control circuit (2) and trigger circuit (12), 485 communication interface circuits (21) bidirectional data communication.

2. boiler water level measure and control device according to claim 1 is characterized in that: the capacitive transducer that said water level detection circuit (1) adopts the capacitor C 1 of the two metal sheets a, b and the output terminal connection thereof that are installed in the water tank inner top side to constitute.

3. boiler water level measure and control device according to claim 1 is characterized in that: two groups of coil L1 of the transformer B that the base stage of said oscillatory circuit (11) employing transistor T 1 is connected with the emitter output terminal, the inductance connecting three point type circuit that L2 forms.

4. boiler water level measure and control device according to claim 1 and 2 is characterized in that: said trigger circuit (12) are made up of the relay that NE555 time base circuit IC1 and output terminal thereof connect.

5. boiler water level measure and control device according to claim 1 and 2 is characterized in that: the COM port that the output terminal of said 485 communication interface circuits (21) through SN75176 communication interface chip IC3 is connected to the RS485 communication interface sends data message to PC.