CN2212276Y - Multifunction circuit detecting protector - Google Patents

Abstract

The utility model relates to a multifunctional circuit detecting protector, which is mainly used for the automatic protection and alarm in case of overheating, low pressure and open phase of a power distribution device or a motor. The utility model is composed of a detection part, a brake display part and an alarm part, and the utility model can be assembled into an integral type and a split central control type; the signal sampling of the utility model adopts triodes, diodes, resistor, etc., and the complete machine of the utility model adopts ordinary dry cell to replace an AC power supply; the utility model adopts totally thirteen triodes, a relay J, a contactor, a loudspeaker as well as matching resistors, capacitors, etc. The utility model has the advantages of light structure, convenient carrying, low cost, low power consumption, long service life, sensitive response and reliable performance, and the utility model has the functions of automatic alarm and automatic protection.

Description

Multifunction circuit detecting protector

The utility model relates to power distribution equipment or a kind of automatic safety device of motor when overheated, low pressure, phase shortage.

Existing power distribution equipment and three-phase alternating-current motor often can not in time find to burn electric equipment because of overheated, low pressure, phase shortage.Though domesticly disclose several motor automatic protectors, but there is following deficiency in majority: (1) makes the sample of signal element because of adopting transformer, thermal relay, instrument transformer etc., the product cost height, volume is big, the life-span is short, accuracy is low, insufficiency, uses inconvenience by dress; (2) because of using AC power, often make protector malfunctioning because of the alternating current phase shortage; (3), can not in time find fault and influence on-call maintenance because of the alarm free function.

The purpose of this utility model provides a kind of multifunctional circuit to detect protector, and this protector can solve following common problem at least: that (1) prevents is overheated because of circuit, low pressure or phase shortage are burnt accidents such as electric equipment; (2) overcome that small product size is big, cost is high, the life-span is short, accuracy is low, insufficiency, use defective such as inconvenience by dress; (3) taking place that circuit is overheated, when low pressure, phase shortage, can in time send alarm signal, in order to early stage maintenance; (4) product assembling can divide two kinds of integral type and split centralized-control types, to adapt to the needs of various circuit-under-tests.

Major technique solution of the present utility model is: design one by detect, braking shows and three parts of reporting to the police are formed, and is provided with the automatic detection protector of monostable circuit.Its main feature is: the sampling element of signal adopts triode, diode and resistance etc. to replace transformer, instrument transformer commonly used in the like product; Complete machine is used general dry battery instead and is replaced AC power, and is provided with the diode voltage stabilizing circuit.Do not influence accuracy of detection when guaranteeing power supply voltage variation 1.5V.

The a of accompanying drawing 1 and b are respectively embodiment schematic diagrames of the front and back assembling of this detection protector.Among the figure 1 is panel, the 2nd, loud speaker, the 3rd, voltage, temperature control adjustment, the 4th, switch, the 5th, housing, the 6th, wiring board, the 7th, battery case, the 8th, electric source connecting box, the 9th, relay J, the 10th, thermistor R2 binding post.

Accompanying drawing 2 is connecting relation schematic diagrames of each circuit part of this detection protector.Square frame I among the figure, II, III, IV are represented detection and display part, brake portion, warning part and A.C. contactor respectively.H among the figure ₁, H ₂, H ₃Be the interface of test section and brake portion, G ₁, G ₂Be the brake portion and the interface partly of reporting to the police.

Accompanying drawing 3 is detection display part schematic circuits of this detection protector.

Accompanying drawing 4 is brake portion schematic circuits of this detection protector.

Accompanying drawing 5 is warning part schematic circuits of this detection protector.

Accompanying drawing 6 is that the integral type of this detection protector is used schematic diagram by dress.

Accompanying drawing 7 is that the split centralized-control type of this detection protector uses schematic diagram by dress.

Followingly be elaborated with reference to the concrete structure and the operation principle of accompanying drawing with this detection protector.

1, test section is as shown in Figure 3 mainly by four triode BG ₁, BG ₂, BG ₃, BG ₄And elements such as the resistance that is complementary with it, electric capacity form, and its input connects with three-phase alternating-current supply A, B, C, output with brake the display part and connect.Its concrete operation principle is as follows:

(1) cross thermal control: when circuit-under-test just often, BG ₁Base voltage by R ₁, W ₁And R ₂Dividing potential drop is supplied with, and makes BG ₁Be in cut-off state.R ₂Be a semistor that is placed in the connection box for motor, in order to adjust W ₁Be appropriate value.When the temperature of motor or power distribution equipment rises to certain value, R ₂Resistance increases, BG ₁Base voltage rise, make its saturation conduction.

(2) phase shortage control: with A phase power supply is example, works as BG ₂When not inserting power supply A, by W ₂, R ₆Supply with base voltage and saturated, under normal circumstances, the voltage of electric current A and earth point E is 220V, through D ₁Voltage is 110V after the detection, passes through R again ₃, R ₄With R ₅After the dividing potential drop, between F to E, produce negative positive voltage down, through capacitor C ₁Be added to BG after the filtering ₂Base stage, make BG ₂Emitter junction end because of adding reverse voltage.During as A point no-voltage, BG ₂The emitter inverse loss of voltage, make BG ₂Saturation conduction.

(3) low voltage control: adjust W ₂Be certain value, when the voltage of power supply A drops to the rated value that can make machine operation, voltage V _FEBe BG ₂Vbe is upgraded to certain value (V thereupon _FE=(9.5v)/(W ₂+ R ₆+ R ₅)-(VA (± 110V))/(R ₃+ R ₄+ R ₅) * R ₅Like this, because of BG ₂Emitter inverse voltage reduce and saturation conduction so BG ₂Collector voltage is reduced to 0.3V.

Equally, when B phase or C phase voltage phase shortage or low pressure, BG ₃Or BG ₄Also can saturation conduction, make its collector voltage reduce to 0.3V.

2, braking display part, as shown in Figure 3 and Figure 4, mainly by BG ₅, BG ₆, BG ₇, BG ₈Form with elements such as relay J and the resistance that is complementary with it, electric capacity.Its input connect with one group of test section at least (Fig. 4 and shown in Figure 7 be by ten ganged switch K ₁-K ₁₀Connect with ten groups of test sections respectively); Output then divides two-way through relay J: the one tunnel through the general dry battery of 12V and the part connection of reporting to the police, and another road connects with three phase mains through contactor.D wherein ₈Be used to protect BG ₈The inverse electromotive force that produces when not disconnected by relay J punctures.D ₅Be used at BG ₁, BG ₂, BG ₃, BG ₄When ending, prevent that supply voltage is through advancing R ₁₃Be added to BG ₆Base stage, BG ₆Base bias is by R ₂₄, D ₇The supply conducting that reaches capacity.BG ₆The collecting voltage of collector electrode is 0.3V, through R ₂₂Be added to BG ₇Base stage, so BG ₇End, the voltage of its collector electrode is supply voltage.BG ₈Emitter junction voltage be zero, so BG ₈End.When A, B, C three-phase voltage lack a phase, or when having a phase voltage to drop to desired prohibition value, or motor temperature is when being higher than rated value, BG ₁, BG ₂, BG ₃BG ₄Always have one or several saturation conduction, make the current potential Vec of its collector electrode reduce to 0.3V, this voltage is through D ₅Be added to BG ₆Base stage.BG like this ₆Base voltage be 0.3V+0.25V=0.55V, so BG ₆End.The current potential of its collector electrode raises, through R ₂₂Be added to BG ₇Base stage, BG ₇Conducting, the current potential of its collector electrode descends, then through R ₂₆Be added to BG ₈Base stage, make BG ₈Conducting.As shown in Figure 6, normal b adhesive battle of relay J, the power supply of connection alarm, simultaneously, normally closed some a of relay J disconnects, and cuts off the motor A.C. contactor, and the adhesive power supply is closed motor.While BG ₁, BG ₂, BG ₃, BG ₄BG when barrier has at least one conducting for some reason ₅Conducting D ₄Luminous demonstration.

3, warning part is as shown in Figure 5 mainly by BG ₉, BG ₁₀, BG ₁₁, BG ₁₂And BG ₁₃, and elements such as the resistance that is complementary with it, electric capacity are formed.Its input connects through the relay J of DC power supply (general dry battery of 12V) with the braking display part, and output connects with loud speaker or other alarm elements.BG wherein ₁₂, BG ₁₁The oscillating circuit of forming about 1000Hz, BG ₁₀, BG ₉The oscillating circuit of forming about 1Hz.With the audio frequency of 1Hz frequency tuning 14Hz, produce alarm signal, through BG ₁₃After the amplification, report to the police through loud speaker.

The use of detection protector of the present utility model can be selected arbitrarily by following situation: when (1) detected circuit has only a motor or a power distribution equipment, can select the integral type model for use, directly press device shown in Figure 6 in circuit-under-test.The a of relay J shown in the figure is normally closed point, the just often attract current of conducting A.C. contactor; B is normal the battle, just often cuts off the power supply of audible alarm, and Ka is control motor and the ganged switch that detects the protector source.In disable motor, also will detect protector and close; When (2) circuit-under-test is multiple electric motors or a plurality of power distribution equipment; can select the model of split centralized-control type for use; by test section of on every motor or each power distribution equipment, installing a detection protector shown in Figure 7; and, form an integrated wire road with the concentrated input that is parallel to a braking display part in each test section.And as shown in Figure 7, the input in each braking display part is equipped with one two utmost point illuminating circuit.Ka among the figure is the ganged switch of motor contactor adhesive power supply, simultaneously, and the power supply of control motor contactor adhesive power supply and test section.As disable motor, can close the test section simultaneously.Break down as any one test section, its lumination of light emitting diode then, even at this moment turn off plug switch K or Ka in parallel, other motors still can move as usual.

Detection protector structure of the present utility model light and handy, easy to carry, cheap (30%-50% that is about like product); the power consumptive province; life-span grows, is quick on the draw, dependable performance, and has automatic sound warning, lamplight pointing and the automatic function of protection.

Claims (6)

1, a kind of multifunctional circuit detects protector, and it is characterized in that forming, and be provided with the monostable circuit by detection, braking demonstration and three parts of reporting to the police, wherein:

(1) sampling element of signal adopts compositions such as triode, diode and resistance;

(2) complete machine adopts general dry battery to replace AC power, and is provided with the diode voltage stabilizing circuit.

2,, it is characterized in that the sample of signal element comprises four triode BG according to the said detection protector of claim 1 ₁, BG ₂, BG ₃, BG ₄And element such as the resistance that is complementary with it, electric capacity; This input that detects the test section of protector connects with three-phase alternating-current supply A, B, C, and output then connects with the braking display part.

3, according to the described detection protector of claim 1, it is characterized in that braking the display part by BG ₅, BG ₆, BG ₇, BG ₈Form with elements such as relay J and the resistance that is complementary with it, electric capacity, its input connects with one group of test section at least, and at each input of braking the display part one two utmost point illuminating circuit is housed; Output then is divided into two-way by relay J: the one tunnel through the general dry battery and the part connection of reporting to the police, and another Lu Zejing contactor connects with three phase mains.

4, according to the said detection protector of claim 1, the part that it is characterized in that reporting to the police is by BG ₉, BG ₁₀, BG ₁₁, BG ₁₂, BG ₁₃And elements such as the resistance that is complementary with it, electric capacity form, and its input connects with the relay J of braking the display part through general dry battery, and output connects with alarm.

5, according to claim 1,2,3 or 4 said detection protectors, it is characterized in that detecting, braking the demonstration and three parts of reporting to the police is the structures that are assembled into an integral body.

6, according to claim 1,2,3 or 4 said detection protectors; it is characterized in that the test section is assembled into one; the braking demonstration and the part of reporting to the police are assembled into the split-type structural of another body, and wherein plural test section can while and the one group of braking demonstration and the part use in parallel of reporting to the police.

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