CN2359563Y

CN2359563Y - Automatic water supply closed-loop control device for steam boiler

Info

Publication number: CN2359563Y
Application number: CN 98251754
Authority: CN
Inventors: 李明荣; 李林; 辜永前
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-12-31
Filing date: 1998-12-31
Publication date: 2000-01-19
Anticipated expiration: 2008-12-31

Abstract

The utility model relates to a full-automatic water supplying closed-loop control device for a steam boiler. A central control meter is coupled in between a liquid level transmitter and a water pump motor of the closed-loop control device, the control meter is composed of a signal circuit, a proportional amplifying circuit, a comparison circuit and a V/I conversion output circuit. The operating safety of the boiler is enhanced through automatically monitoring the water level of the boiler, disastrous accidents brought by the dry-out of the boiler and full water caused by artificial factors can be avoided, the service life of a boiler electric appliance can be extended, and a boiler system can save electricity by 50% to 60%.

Description

Steam boiler full automatic water supply closed-loop control device

The utility model relates to a kind of boiler water supply control appliance.At present, boiler mainly contains two kinds of water feeding modes, and a kind of is artificial across-the-line starting water pump, reaches termination of pumping when needing water level in water inlet, this kind water feeding mode major defect have following some:

When one, the fireman is absent minded, cause the situation of boiler water shortage or filling up water easily, this will cause catastrophic accident to boiler;

Two, pressure of steam supply instability;

Three, the feed pipe Louis produces water hammer, causes water pipe head place to leak, and the water pump life-span reduces;

Four, electric equipment is fragile, because of Fraquent start, and all corresponding reductions in service life such as air switch, contactor, motor, water pump;

Five, labor strength is bigger, wants switch once in two minutes, wants switch in the class about 240 times;

Another kind of way of supplying water is that water pump does not stop, and controls boiler feed water by the magnetic valve automatic switch, on this mode major defect of water have following some:

One, power consumption is big, and water pump is in the state of operating at full capacity always, and is totally unfavorable to water pump;

Two, be interrupted to supply water, cause the boiler shakiness of steaming;

Three, produce water hammer, unfavorable to the boiler water supply pipeline;

Four, worker and unreliable, mainly unreliable by magnetic valve work, the ineffective generation of switch.

The purpose of this utility model is that a kind of boiler that can guarantee of design is successively gone up water, and makes water level remain on safety level with interior automatic water-supply closed-loop control device.

The utility model has reached above-mentioned purpose of design, it comprises the boiler water filling pipeline, liquid level detector, fluid level transmitter, pump motor and economizer constitute the water supply closed loop, it is characterized in that between fluid level transmitter and pump motor, inserting a center controller and a variable-frequency governor, this center controller is made of signal circuit, ratio amplifying circuit, comparison circuit, V/I conversion output circuit, and each circuit output, input signal end are linked in sequence.

Operation principle of the present utility model is: when boiler liquid level descended, the fluid level transmitter output current reduced, and through controller electric current was raise, frequency converter frequency rises, and makes the pump motor faster rotational speed, and the water yield increases on the water pump, boiler liquid level is risen, and along with boiler liquid level rises, the fluid level transmitter output current rises, descend through the controller output current, frequency converter frequency reduces, and motor speed is slack-off, and the last water yield reduces, so circulation makes boiler liquid level remain at a substantially invariable liquid level.

The utility model has solved the control problem of boiler water filling for a long time, by automatic monitoring boiler water level, the boiler operatiopn security is improved greatly, that has avoided that human factor causes dryouies the catastrophic failure that pot and full water are brought, because of continuous water supply, be difficult for producing vapour, water slug, economizer and watering pipeline are not fragile, boiler temperature can not be undergone mutation and be made the steam supply pressure more stable, because of the variable frequency regulating speed control pump motor, and non-impact current during starting, system just no longer resets once starting, electrical equipment and motor all flow down work in small electric, air switch, contactor, motor, all prolong greatly the service life of water pump etc., simultaneously, of the present utility model coming into operation can make steam generator system economize on electricity 50～60%.

In a single day the utility model puts on market, will use domestic boiler for producing and produce far-reaching influence.

Further specify the utility model below in conjunction with accompanying drawing:

Fig. 1 the utility model theory diagram

Fig. 2 center controller circuit block diagram

Fig. 3 center controller circuit theory diagrams

As seen from Figure 1, this steam boiler automatic water-supply closed-loop control device constitutes a closed loop by boiler water filling pipeline, liquid level detector, fluid level transmitter, center controller, variable-frequency governor, pump motor and economizer, in closed loop, increase center controller and variable-frequency governor, pump motor subtracted when boiler water level was risen, pump motor speedup when water level descends, thereby make boiler water level reach dynamic balancing, remain in the liquid level zone of a safety, avoided dryouting the catastrophic failure of pot and full-water level.Input of the present utility model, it is stable that the boiler steam supply is pressed, and do not produce steam and water bursting, do not produce powerful electric motor starting electric current, makes the not fragile leakage of economizer and watering pipeline, also increases the service life greatly because of all electrical equipment all are operated in little current status.

By Fig. 2, Fig. 3 as seen, the center controller is by signal circuit, the ratio amplifying circuit, comparison circuit, V/I conversion output circuit is linked in sequence and forms, signal circuit is by R1～4, C1～2 constitute, proportional amplifier is by operational amplifier A 1 and resistance R 5, R6 constitutes, A1 adopts OP07, comparison circuit is by amplifier A2, resistance R 7～10, potentiometer W1 constitutes, A2 adopts 358, V/I conversion output circuit is by amplifier A3, transistor BG1, potentiometer W1, voltage-stabiliser tube D1, resistance R 11～14 and capacitor C 3 constitute, A3 adopts 358, BG1 adopts 8050, and the voltage stabilizing value of D1 is 5.8V.

In order to prevent that fortuitous event from taking place, present embodiment center controller connects a warning device.

Claims

1, steam boiler full automatic water supply closed-loop control device, constitute the water supply closed loop by boiler water filling pipeline, liquid level detector, fluid level transmitter, electric motor starting controller, pump motor and economizer, it is characterized in that between fluid level transmitter and pump motor, inserting the output center controller, this center controller is made of signal circuit, ratio amplifying circuit, comparison circuit, V/I change-over circuit, and the signal I/O of each circuit is linked in sequence.

2, steam boiler full automatic water supply closed-loop control device as claimed in claim 1 is characterized in that the center controller connects an alarm.