CN201230203Y

CN201230203Y - Motor power protection switch

Info

Publication number: CN201230203Y
Application number: CNU2008201307197U
Authority: CN
Inventors: 占鹏飞
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-07-15
Filing date: 2008-07-15
Publication date: 2009-04-29
Anticipated expiration: 2018-07-15

Abstract

The utility model relates to a motor power protection switch, which is characterized in that a power controller (4) is provided with an output power dial (5) adjusting and limiting power output, a turn-knob (6) and a mark (7). On the basis of familiar motor power, the output power can be limited by adjusting the scale number of the dial (5). When the consumed power of a motor (9) is larger than the number specified on the dial, the power controller works, which realizes the protection action of automatic power off when the motor runs in open-phase or overloading condition. When the utility model is used, proper specifications and models are chosen according to the motor power. As long as a terminal board (8) is connected with a power line (11) and a motor line (12), the motor can be started or stopped by pressing a button. With the advantages of simple structure and convenient use, the utility model improves the normativity and the security of motor power utilization, which is applicable to the motor between 1.5 kw and 40 kw, the protection and the line electricity restriction of other electrical installations.

Description

The motor power (output) protection switch

Technical field:

The utility model relates to a kind of electrical adjustment of utilizing and limits the motor power (output) protection switch that the power controller power output realizes that motor can cut off the power supply automatically at the central phase shortage of operation, overburden.

Background technology:

At present; though prior art is various for its kind of protection of motor; diverse in function; and high-tech product constantly comes out; but; the motor protecting device that these are various in style; generally all be that configuration is just arranged in medium and high-grade equipment; and cost an arm and a leg, and among the people, the electronic facility that the general power that antithetical phrase is civilian or small business uses is little; it effectively protects facility except that old-fashioned use self coupling reduced voltage starter; very few really, just be to use the contactor or the circuit breaker of short circuit or overload protection function, the short circuit of other configuration also should be arranged; the attachment device of overload; also there is not this finished product product in the market; and assembling when needing the professional in addition among the people, wants to look for the professional of a this equipment of assembling easier said than done.No matter yet be to use contactor or the circuit breaker or the self coupling reduced voltage starter of being made by manufacturers or users; their control mode all is to utilize the mode of regulating the electric current on the thermal relay; though adopt the mode of this qualification thermal relay output current to reach to realize motor phase shortage or overburden can cut off the power supply automatically in the middle of operation; but in real life; people are not that everybody is very expert for " "; notion for electric current is just fuzzyyer; raise electric current at thermal relay; have only the professional just to know use; and people for the saying of motor size traditionally always with power---kilowatt number is a unit; determine the size of motor; and seldom mention electric current; therefore in the middle of reality is used; most of users can not use for the Current Regulation on the thermal relay; simultaneously; the motor that the self coupling reduced voltage starter generally can only adapt to more than more than 10 thousand uses; and cost an arm and a leg; and for the motor below more than 10 thousand; because of there not being the existing product adapted of complete standard on the market; the overwhelming majority is to use the knife switch that has no safeguard measure directly to start use; have even the motor more than more than 10 kilowatts also uses plug-in strip directly to start use; again and again burnt with regard to having caused motor in use to can not get well protection like this; that have even initiation fire leads to security incident.Therefore, for motor protection switch civilian or that the supporting electronic facility of medium-sized and small enterprises uses, its standardization has become a blank with fail safe among the people.

Summary of the invention:

For overcoming the defective of above-mentioned prior art to motor protection; the utility model provides a kind of motor protection switch that is formed by elements combination such as A.C. contactor, power controllers; particularly a kind of method that adopts electrical adjustment to limit the power controller power output realizes the motor power (output) protection switch that motor phase failure in the middle of operation, overburden can cut off the power supply automatically; be enough to make motor to be protected fully in the middle of operation, it is not only simple in structure, easy to use, cost is low but also improved the standardization and the fail safe of motor electricity consumption.Its technical scheme is: a kind of motor power (output) protection switch, comprise switch-box and be disposed at case interior earth leakage protective device, A.C. contactor, power controller, switch knob, terminal block, major loop line and control loop line, it is characterized in that: have one on the power control panel for the power output dial of regulating limited output and adjusting turn-knob and mark thereof; The power output dial is a square or rectangular or circular label, and the circular arc relative position beyond the turn-knob cylindrical is printed on adjacent power of electric motor numeral and mark thereof more than 3 or 3, is fixed on the controller top; Regulating parts is the axle rotating potentiometer, and rotating shaft is passed and is fixed on power output dial central point or the centre point and is inlaid in the interior circle of turn-knob.

The power controller power supply is that a power supply is formed after filter capacitor filtering by 2 current transformer secondary coil outputs and 2 diode rectification parallel connections.

Control circuit is made up of triode, relay, delay capacitor, shunt capacitance, potentiometer and auxiliary resistance thereof.

Delay capacitor is connected with potentiometer and auxiliary resistance and is constituted charge circuit and in parallel with filtering capacitor, is connected on the power positive cathode.

Delay capacitor is an electrochemical capacitor, and an end is connected with transistor emitter, and the other end is connected with transistor base.

The utility model is simple in structure, and is easy to install, and security performance is good, and electric leakage, phase shortage, the automatic power-off protection of overload are arranged, and people can utilize it easily, is engaged in startup, operation and the shutdown operation of motor.Do not need the installation insurance silk during use; equate as long as kilowatt number on the dial is transferred to a kilowatt number that uses motor; energized line and motor line can be used; very simple and convenient; thereby solve civilian or standardization and this blank of fail safe of the supporting electronic facility use motor switch of medium-sized and small enterprises among the people; the motor that is specially adapted in civilian and supporting 1.5 kilowatts to the 40 kilowatts scopes of medium-sized and small enterprises uses; also can be used for controlling the use of rationing the power supply of other various electricity consumption facilities protections and circuit; and raw material are easily purchased; make to install and be easy to realize possessing certain popularizing value.

Description of drawings:

1 is switch-box among the figure, and 2 is earth leakage protective device, and 3 is A.C. contactor; 4 is power controller, and 5 is the power output dial, and 6 is turn-knob; 7 is the turn-knob mark, and 8 is terminal block, and 9 is motor; 10 is the major loop line, and 11 is power line, and 12 is motor line; 13 for stopping knob, and 14 for starting knob, and 15 is the control loop line; 16 is self-holding contact; 17 is current transformer, and 18 is rectifier diode, and 19 is filter capacitor; 20 is triode; 21 is delay capacitor, 22 auxiliary resistances, and 23 is potentiometer; 24 is relay, and 25 is shunt capacitance.

Embodiment:

At first; behind the power of confirming motor (9); the motor power (output) protection switch of the specifications and models that adapt by its power selection again; the mark (7) of the adjusting turn-knob (6) on the power controller (4) on power output dial (5), is transferred to the scale position identical or close with kilowatt number of motor (9).As motor (9) power is 7.5 kilowatts; should select the motor power (output) protection switch of 4-10 kilowatts of specifications and models for use; on power output dial (5), find 7.5 numerals and the mark (7) of turn-knob (6) transferred to and aim at this numeral; again power line (11) and motor lines (12) are received the relevant position of terminal block (8) respectively; do not need the installation insurance silk just can come into operation; very simple and convenient; click starting switch knob (14) during use; control loop (15) energising; A.C. contactor (3) solenoid gets electric and adhesive; major loop (10) conducting; and self-holding contact (16) self-locking; at this moment because in power controller (4) circuit, dispose delay capacitor (21); so motor can not cause the misoperation of controller (4) because of excessive starting current in the moment that starts; thereby motor (9) normally obtains electric operation; click and stop knob (13); control loop (15) outage; A.C. contactor (3) solenoid dead electricity and tripping; major loop (10) outage, motor (9) shuts down.Under normal circumstances the consumed power of motor (9) is less than or equal to 7.5 kilowatts that the power output dial is limited; motor runs well; and under phase shortage or extra-heavy situation; 7.5 kw of power that the consumed power of motor (9) all will limit greater than dial; at this moment the electric current of 2 on the major loop (10) or 1 instrument transformer (17) increases; electric current after diode (18) rectification merges also increases thereupon; so that exceed relay (24) attract current that former power adjustments potentiometer (23) is limited by triode (20) output; impel relay (24) adhesive and make control loop (15) outage; A.C. contactor (3) trips because of the solenoid dead electricity; major loop (10) outage; motor (9) can not burnt thereby motor (9) is protected because of dead electricity shuts down.

The utility model has 1.5-4 kilowatts, 4-10 kilowatts, 10-22 kilowatts, 22-32 kilowatts, 32-40 kilowatts specifications and models according to the required a series of products of adapted motor power (output) size.The utility model is provided with star-triangle automatic or manual translation function device to above-mentioned specification product under the situation that does not allow directly to start at supply transformer for the motor more than more than 10 kilowatts; simultaneously according to user's needs; above-mentioned specifications and models are set up and can be supplied more than 2 or 2 simultaneously and a series of products of motor power (output) protection switch that the forward and backward function is arranged, for the supporting use of motor in 1.5-40 kilowatts of scopes.Also can be made into a series of single-phase power protection switches according to same principle the utility model in addition, for the use of rationing the power supply of single-phase motor or other electricity consumption facilities or circuit.

Because what the utility model adopted is that the power of electric motor of being familiar with traditionally with people is a foundation; to regulate that power output that power output on the power dial limits power controller realizes protecting motor or other electricity consumption facilities or as the circuit use of rationing the power supply; like this when motor or other electricity consumption facility actual power consumptions during greater than power output that power controller limited; just be equivalent to motor phase shortage or overburden or the electricity consumption facility is out of order; circuit is cut off the power supply automatically; to reach protection motor and other electricity consumption facilities; therefore so long as other elements combination of utilizing this principle to reach this purpose form or specifications and models have the other types product of change, all belong to the utility model protection range.

Claims

1, a kind of motor power (output) protection switch, comprise switch-box (1) and be disposed at case interior earth leakage protective device (2), A.C. contactor (3), power controller (4), switch knob (13,14), terminal block (8), major loop line (10) and control loop line (15), it is characterized in that: have one on power controller (4) panel for the power output dial (5) of regulating limited output and adjusting turn-knob (6) and mark (7) thereof; Power output dial (5) is a square or rectangular or circular label, and the circular arc relative position beyond turn-knob (6) cylindrical is printed on adjacent power of electric motor numeral and mark thereof more than 3 or 3, is fixed on the controller top; Regulating parts is axle rotating potentiometer (23), and rotating shaft is passed and is fixed on power output dial (5) central point or the centre point and is inlaid in the interior circle of turn-knob (6).

2, by the described motor power (output) protection switch of claim 1, it is characterized in that: power controller (4) power supply is that a power supply is formed after filter capacitor (19) filtering by the output of 2 current transformers (17) secondary coil and 2 diodes (18) rectification parallel connection.

3, by the described motor power (output) protection switch of claim 1, it is characterized in that: control circuit is made up of triode (20), relay (24), delay capacitor (21), shunt capacitance (25), potentiometer (23) and auxiliary resistance (22) thereof.

4, by the described motor power (output) protection switch of claim 1, it is characterized in that: delay capacitor (21) is connected with potentiometer (23) and auxiliary resistance (22) and is constituted charge circuit and in parallel with filtering capacitor (19), is connected on the power positive cathode.

5, by the described motor power (output) protection switch of claim 1, it is characterized in that: delay capacitor (21) is an electrochemical capacitor, and an end is connected with triode (20) emitter, and the other end is connected with triode (20) base stage.