CN2290716Y

CN2290716Y - Start and control device of blower

Info

Publication number: CN2290716Y
Application number: CN 96232659
Authority: CN
Inventors: 张双臻; 刘三翠
Original assignee: Dachuan Electronic Tech Inst Sichuan Prov
Current assignee: Dachuan Electronic Tech Inst Sichuan Prov
Priority date: 1996-02-06
Filing date: 1996-02-06
Publication date: 1998-09-09
Anticipated expiration: 2006-02-06

Abstract

The utility model provides a start and control device of a blower, comprising a main circuit connected with a motor and a control circuit. The control circuit is provided with a phase interrupting, overload and short-circuit protecting circuit, a protecting circuit with no conversion after a long time, a variable voltage starting circuit and an operating circuit; the operating circuit is connected with the protecting circuit with no conversion after a long time in series after is connected with the variable voltage starting circuit in series, and then is connected with the phase interrupting, overload and short-circuit protecting circuit in series. The starting electric current is reduced, the starting performance is improved, and the quality of the network is enhanced; the utility model can reliably guarantee the safe operation of the motor, the blower and the starting device.

Description

Blower starting and control gear

The utility model relates to a kind of blower starting and control gear.

JJ1 type auto-transformer starter is compared the electrical apparatus element performance with the XJ01 starter and is made moderate progress, and quality increases, on the line design from start to moving overall process adopt closed circuit conversion regime, can avoid the secondary pulse electric current that in transfer process, produces effectively.But through facts have proved; exist the unreasonable and not exclusively reliable problem of open-phase protection of conversion of forcing; and the motor ultra-long time changed the shortage protective measure for some reason and not; the transistor type soft starter device, though function is many, starting performance is good; but cost an arm and a leg; than the starting device of motor price of a same capacity expensive 3～5 times, market capacity is little, is difficult for promoting.

In view of above reason, the purpose of this utility model is for a kind of starting that is exclusively used on the blower is provided, blower starting and control gear safe and reliable to operation, simple in structure, that cost is low.

The major loop, the control loop that are connected with motor are arranged in the utility model; the phase failure, overload, short-circuit protection circuit are arranged in the control loop; ultra-long time is the translation and protection loop not; the variable voltage start loop; behind the operating loop, operating loop and the parallel connection of variable voltage start loop with the ultra-long time back connect with the phase failure, overload, short-circuit protection circuit (referring to Fig. 1, Fig. 2) of not connecting, translation and protection loop.

The one-level coil of automatic air-break switch ZK in the above-mentioned major loop, A.C. contactor K3, mutual inductor LH and motor M series connection, A.C. contactor K2, variable voltage transformer KBB, A.C. contactor K1 series connection, A.C. contactor K0 is in parallel with K1 by the transformer portion coil, coil tap a, the b of transformer, c are connected with a, b, the c of A.C. contactor K3 lower end respectively, last transformer circuit (referring to Fig. 2) in parallel with K3.

Also have in the above-mentioned control loop with ultra-long time not translation and protection loop-coupled by A.C. contactor K4, reactor DK inhale reactive power compensation control loop that capacitor C is in series, digital show circuit, the Reactive Power Control compensation circuit (referring to Fig. 1, Fig. 2) in parallel with motor M of the fan parameter measured that is connected with major loop; can in time observe blower fan at starting and operating major parameter, as the momentary value of blast, oil temperature, bearing temperature.

Compare with existing motor starter, the utlity model has following advantage:

1, because variable voltage starting has reduced starting current, starting performance is improved greatly, and the mechanical wear of motor and blower fan is reduced, and the impact of electrical network is also reduced, and has improved the quality of electrical network;

2, protective value strengthens greatly, no matter is also to be in operation can both the phase failure, overcurrent, the short circuit of motor be shielded in starting, to the motor ultra-long time not conversion operation protective function is also arranged.Compare with the thyristor soft start, starting performance can reach the requirement of blower fan fully, and is reliably guaranteed to the security of operation of motor and blower fan, starting arrangement;

3, energy-saving effect is good, and energy-conservation reaching about 10% improved the quality of power supply network, reduced reactive loss;

4, the main Operational Limits of blower fan has instantaneous digital display, can in time grasp the fan operation state, improves fan operation Security and high benefit;

5, simple in structure, cost is low, if do not add electric capacity compensation and digital display loop, price is basic suitable with the JJ1 series product in the utility model, but performance improves greatly.Compare with the thyristor soft start, starting performance can reach the requirement of blower fan fully, 3～5 times of low prices, and cheap 2～3 times than A.C. contactor variable voltage Trigger Price, and power can reach 320KW.

Describe embodiment of the present utility model in detail below in conjunction with accompanying drawing:

Fig. 1 is the utility model circuit block diagram.

Fig. 2 is the utility model circuit theory diagrams.

Referring to Fig. 1, major loop 1, control loop 2 are arranged in the utility model.The phase failure, overload, short-circuit protection circuit 3, reactive power compensation control loop 4, ultra-long time not translation and protection loop 5, variable voltage start loop 6, operating loop 7, digital show circuit 8 are arranged in the control loop 2.

Referring to Fig. 2, the automatic air-break switch ZK in the major loop 1, the primary winding of A.C. contactor K3, mutual inductor LH and motor M series connection; A.C. contactor K2, variable voltage transformer KBB, A.C. contactor K1 series connection.The coil sections of K0 by transformer is in parallel with K1, and coil tap a, the b of transformation line, c are in parallel with K3 with a, b, the c of the K3 lower end last transformer circuit that links respectively; The thermoelement of thermorelay is connected with Secondary coil, ammeter A, the current relay coil of two mutual inductors respectively, and a pair of normally opened contact of auxiliary reclay KM is connected in parallel on the coil two ends of KA; A.C. contactor K4; it is in parallel with motor M that reactor DK and capacitor C are connected into the reactive power compensation control loop; two controllable silicon SCR in the phase failure in the control loop 2, overload, the short-circuit protection circuit 3, SCT2 parallel connected in reverse phase are in parallel with capacitor C 1 resistance R 1 series arm again; the a pair of normally-closed contact of thermorelay FR is serially connected in two silicon controlled trigger electrodes; A.C. contactor K3 normally-closed contact; K1 normally-closed contact and tutorial light H1, series connection be then and at the end of throw over switch SA, the other end and in the controllable silicon loop.Stop button SB4 in the reactive power compensation loop 4, starting button SB5 (self-sustaining of K4 normally opened contact) connects with A.C. contactor K4 coil, tutorial light H4 and K4 coils from parallel connection of coils, time relay KS1 coil in the variable voltage start loop 5 and H2 also are unified into a branch road, make contact is connected and the K1 coils from parallel connection of coils is connected into a branch road with a pair of normally-closed contact of auxiliary reclay KM then again between the time-delay of A.C. contactor K0 coil and time relay KS2, A.C. contactor K2 coil and KS2 coils from parallel connection of coils, each branch road last and starting button SB2 (K2 often opens self-sustaining) in parallel again, the normally-closed contact series connection of K3.A pair of normally opened contact and the capacitor C 2 of A.C. contactor K3 in the operating loop 7 are connected into a branch road; The a pair of normally opened contact of auxiliary reclay KM and a pair of normally-closed contact of K1, the coil series connection of K3.C3 connects with R2 and is connected on the quiet run loop with a pair of normally-closed contact of KM after diode D is in parallel, itself and H3, K3 coils from parallel connection of coils; The branch road of connecting with the KM coil after the normally-closed contact parallel connection of a pair of normally opened contact of KM and throw over switch SA, operation button SB3, current relay KA is again with the K3 path of winding and be unified into operating loop.Ultra-long time is not connected with the time-delay break contact of KS1 after the variable voltage start loop in the translation and protection loop 5 and the operating loop parallel connection.The contact of each control loop is: do not connect and connect with the phase failure, overload protection loop by stop button SB1 with the parallel connection of reactive power compensation control loop then again in the translation and protection loop with ultra-long time after operating loop and the parallel connection of variable voltage start loop.Control loop is the 380V power supply of getting from main circuit by two fus FU.Getting the oily temperature show circuit of 220V (380V) voltage (voltage rating on Displaying Meter is decided) in digital show circuit 8 from major loop is made up of thermometric instrument T1 and its acoustic-optic alarm.The H5 lamp is with in parallel with the corresponding site of instrument again with the normal open string connection of T1 after electric whistle DD1 is in parallel.The bearing temperature show circuit is made up of thermometric instrument T2 and its acoustic-optic alarm, and the H6 lamp is with in parallel with the corresponding site of instrument again with the normal open string connection of T2 after electric whistle DD2 is in parallel; The blast show circuit is made up of pressure gauge P and its acoustic-optic alarm.The H7 lamp is with in parallel with the corresponding site of instrument again with the normal open string connection of P after electric whistle DD3 is in parallel, each loop parallel connection.Sensor one end of each several part is at the corresponding site of blower fan, and the other end is on corresponding instrument.

Connect power supply, the air-break switch ZK that closes pulls throw over switch SA in automatic (manually) position, and the H1 lamp is promptly bright; Press starting button SB2, contactor K1, K2 adhesive and self-sustaining, motor begins to start under first grade of 50% voltage, the H1 lamp extinguishes, the H2 lamp is bright, KS1, the adhesive of the KS2 time relay simultaneously also picks up counting, the timing closing make contact of KS2 behind certain hour (setting time of KS2 is shorter than the setting time of KS1), the adhesive of K0 contactor, motor starts under second grade of 75% voltage; When starting current drops to the setting valve of KA, the normally-closed contact adhesive of current relay (manually time press SB3 operation button), auxiliary reclay KM adhesive, K1, K0 dead electricity, K3 adhesive, K2 dead electricity, motor is converted to running state, and the while, H2 extinguished, and the H3 lamp is bright; Press stop button SB1, the motor stall.

In running, can be by SB5, adhesive contactor K4 makes capacitor work; Reach the purpose that improves the power factor economize on electricity, press stop button SB4, capacitor quits work.

If the starting time surpasses the setting time of KS1, the time-delay break contact of KS1 disconnects, and forces motor to stop, and has protected motor to protect transformer again.

As overload, short circuit, during the accident of the phase failure, the normally opened contact of phase failure thermorelay disconnects, and allows controllable silicon end, and the motor stall is protected.

In running, the major parameter of blower fan obtains monitoring.

For the one push start electric current is reduced as far as possible, the first retaining starting voltage should reduce as far as possible, and according to the load characteristic of blower fan, first retaining voltage can be chosen in 40～50%.Can adopt the conversion that increases the transformer coil number of turn and contactor K0 to reach the purpose of variable voltage starting.In the adjustment process of variable voltage, connect power supply, press starting button SB2, press tentaculum K1, K2 adhesive successively, time relay KS1, KS2 adhesive simultaneously, motor starts under first retaining, 50% voltage; The K0 contactor is connected after time relay K S2 delay arrival time, and motor starts under 75% voltage; 75% forwards 100% operation to by the automatic conversion of current relay control or by running button manual switch.If 75% ultra-long time does not forward the KS1 protection that does not move the time relay then to, force to stop, reset after making the operator find fault.

Lower in the utility model device owing to initial start voltage, therefore starting current is much smaller, when the threephase load balance, the ratio of excess current and setting current generally is not more than 2 times, the operate time cheracteristic of thermorelay has determined to satisfy fully in starting thermorelay and has been failure to actuate under this state again, therefore there is no need short circuit.If motor and blower fan just have accident potential such as axis, stall, the phase failure at prestart; in case starting; then starting current is far longer than 2 times; generally to reach 5～6 times; this moment, thermorelay moved in several seconds; therefore fully can be to the phase failure of motor in starting process, faults such as stall are given protection.

Claims

1, blower starting and control gear; it is characterized in that the major loop, the control loop that are connected with motor in the described control gear; the phase failure, overload, short-circuit protection circuit are arranged in the control loop; ultra-long time is the translation and protection loop not; the variable voltage start loop; connect with the phase failure, overload, short-circuit protection circuit again after do not connect in the translation and protection loop with ultra-long time behind the operating loop, operating loop and the parallel connection of variable voltage start loop.

2, blower starting as claimed in claim 1 and control gear, it is characterized in that automatic air-break switch ZK, the A.C. contactor K3 in the described major loop, one-level coil and the motor M series connection of mutual inductor LH, A.C. contactor K2, variable voltage transformer KBB, A.C. contactor K1 series connection, A.C. contactor K0 is in parallel with K1 by the transformer portion coil, coil tap a, the b of transformer, c are connected with a, b, the c of A.C. contactor K3 lower end respectively, and last transformer circuit is in parallel with K3.

3, blower starting as claimed in claim 1 and control gear; it is characterized in that in the described control loop also having and the ultra-long time digital show circuit of the loop-coupled Reactive Power Control compensation control loop that is in series by A.C. contactor K4, reactor DK and capacitor C of translation and protection, the fan parameter measured that is connected with major loop not, the reactive power compensation control loop is connected with motor M.