CN211456665U - Explosion-proof isolation protection device for electricity consumption - Google Patents

Abstract

An explosion-proof isolation protector for electric consumption is composed of overcurrent protecting switch, isolating transformer, current transformer, the power relay, the intelligent protection module, output overcurrent protection switch, input overcurrent protection switch's input is used for connecting the commercial power, two output pins of input overcurrent protection switch connect two pins on isolation transformer primary side respectively, the first terminal of the normally closed contact of power relay is connected to the first pin of isolation transformer secondary side, current transformer wears to overlap behind the first pin of isolation transformer secondary side and the first terminal of power relay normally closed contact outside the electric connection line, the second terminal of the normally closed contact of power relay connects the first terminal of the first phase line normally closed contact of output overcurrent protection switch, the first terminal of the second phase line normally closed contact of output overcurrent protection switch connects the second pin of isolation transformer secondary side.

Description

Explosion-proof isolation protection device for electricity consumption

Technical Field

The utility model relates to an with electric protection device technical field, especially, relate to an explosion-proof isolation protection device of power consumption.

Background

At present, an electric appliance is a necessary high-efficiency tool, but the electric appliance is a very dangerous thing when being used in flammable and explosive occasions, such as gas stations, flammable oil and gas processing occasions, even kitchens with dense fuel gas release and the like, but the electric appliance is a necessary tool, so that the current situation has a great danger, and great inconvenience is caused by using the electric appliance in the flammable and explosive occasions in a limited time.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides an explosion-proof isolation protection device for electricity consumption.

An explosion-proof isolation protection device for electricity consumption, wherein: the intelligent protection device comprises an input overcurrent protection switch, an isolation transformer, a current transformer, a power relay, an intelligent protection module, an alarm module and an overtemperature protection device; the input end of the input overcurrent protection switch is used for being connected with a mains supply, the output overcurrent protection switch is a mechanical mains supply/protection switching switch, the first path of the input side of the output overcurrent protection switch is a two-phase pin of the mains supply, and the second path of the input side of the output overcurrent protection switch is a two-phase pin of a protection circuit;

the output side of the input overcurrent protection switch is divided into two paths: the first path is as follows: two pins at the output side of the input overcurrent protection switch are connected with a first path of commercial power two-phase line pin at the input side of the output overcurrent protection switch in a one-to-one correspondence manner;

and a second path: the two pins of the output side of the input overcurrent protection switch are correspondingly connected with the two pins of the primary side of the isolation transformer one by one, the first pin of the secondary side of the isolation transformer is connected with the input side terminal of the normally closed contact of the power relay, the current transformer is sleeved outside an electric connection line between the first pin of the secondary side of the isolation transformer and the input side terminal of the normally closed contact of the power relay in a penetrating way, the output side terminal of the normally closed contact of the power relay is connected with the first phase line terminal of the two pins of the second path of protection circuit of the input side of the output overcurrent protection switch, and the second phase line terminal of the two pins of the second path of protection circuit of the input;

two ends of the current transformer are connected with two input terminals of the intelligent protection module in a one-to-one correspondence manner; the control signal output end of the intelligent protection module is connected with the first end of the coil of the power relay, and the second end of the coil of the power relay is grounded;

the intelligent protection module comprises an intelligent ammeter, a first intermediate relay KA1, a second intermediate relay KA2, a first time relay KT1 and a second time relay KT2, wherein two signal input terminals of the intelligent ammeter are connected with two ends of the current transformer in a one-to-one correspondence manner;

the short-circuit signal output end of the intelligent ammeter is connected with the first end of a coil of the second intermediate relay KA2, the second end of the coil of the second intermediate relay KA2 is grounded, the second end 4 pins of a normally open contact of the second intermediate relay KA2 are connected with a 12V power supply, the first end 6 pins of the normally open contact of the second intermediate relay KA2 are connected with the first end of the coil of the power relay, and the second end of the coil of the power relay is grounded;

the overload signal output end of the intelligent ammeter is connected with the first end of a coil of the first time relay, and the second end of the coil of the first time relay is grounded; the first end of the normally open contact of the first time relay is connected with a 12V power supply, and the second end of the normally open contact of the first time relay is divided into three paths: the first path is connected with the first end of a coil of the second time relay, and the second end of the coil of the second time relay is grounded; the second path is connected with the first end of the normally closed delay jump joint of the second time relay, the second end of the normally closed delay jump joint of the second time relay is connected with the first end of the coil of the first intermediate relay, and the second end of the coil of the first intermediate relay is grounded; the third path is connected with the first end of the first normally open contact of the first intermediate relay, the second end of the first normally open contact of the first intermediate relay is simultaneously connected with the 12V power supply and the second end of the normally open contact of the second intermediate relay, and the first end of the normally open contact of the second intermediate relay is connected with the first end of the coil of the power relay;

the first end of a second normally open contact of the first intermediate relay is connected with a 12V power supply, and the second end of the second normally open contact of the first intermediate relay is connected with the first end of a coil of the power relay;

the alarm module comprises an insulation resistance measuring instrument H2 and an alarm horn;

the signal acquisition input end of the insulation resistance measuring instrument H2 comprises two pins, and the two pins of the signal acquisition input end of the insulation resistance measuring instrument H2 are connected with the two pins of the second path of protection circuit on the input side of the output overcurrent protection switch in a one-to-one correspondence manner;

two pins of an alarm signal output end of the insulation resistance measuring instrument H2 are correspondingly connected with two power supply input ends of the alarm horn;

the overtemperature protection device comprises a comparator, a reference voltage circuit, a thermistor, a temperature signal circuit and an overtemperature alarm circuit;

the reference voltage circuit comprises a second resistor, a third resistor, an eighth resistor and a ninth resistor, the second resistor and the third resistor are connected in parallel to form a first parallel circuit, the eighth resistor and the ninth resistor are connected in parallel to form a second parallel circuit, the first end of the first parallel circuit is connected with a 12V power supply, the second end of the first parallel circuit is connected with the first end of the second parallel circuit in series, and the second end of the second parallel circuit is grounded; the middle joint of the first parallel circuit and the second parallel circuit is connected with the reference voltage input end of the comparator;

the temperature signal circuit comprises a fourth resistor, a sixth resistor and a seventh resistor, and the sixth resistor and the seventh resistor are connected in parallel to form a third parallel circuit; the first end of the thermistor is connected with a 12V power supply, the second end of the thermistor is connected with the first end of a fourth resistor R4, the second end of the fourth resistor R4 is connected with the first end of a third parallel circuit, and the second end of the third parallel circuit is grounded; the intermediate joint of the fourth resistor R4 and the first end of the third parallel circuit is connected with the temperature signal input end of the comparator;

the overtemperature alarm circuit comprises a fifth resistor, a first triode, an overtemperature alarm buzzer and a first diode, wherein the first triode is a PNP type triode, the first resistor is connected between an emitting electrode and a base electrode of the first triode, the emitting electrode of the first triode is connected with a 12V power supply, the base electrode of the first triode is connected with the alarm signal output end of the comparator after being connected with the fifth resistor in series, a collector electrode of the first triode is connected with the first end of the overtemperature alarm buzzer, and the second end of the overtemperature alarm buzzer is grounded; the anode of the first diode is connected with the second end of the over-temperature alarm buzzer, and the cathode of the first diode is connected with the first end of the over-temperature alarm buzzer; the collector of the first triode is also connected with the overtemperature signal input end of the intelligent protection module, and the overtemperature signal input end is the first end of the coil of the first-time relay.

Further, the explosion-proof isolation protection device of electricity consumption, wherein: the comparator model uses LM 358.

Further, the explosion-proof isolation protection device of electricity consumption, wherein: the heat dissipation circuit comprises a heat dissipation fan and a first switch, wherein the first end of the first switch is connected with a 12V power supply, the second end of the first switch is connected with a first wiring terminal of the heat dissipation fan, and a second wiring terminal of the heat dissipation fan is grounded; the wind direction of the heat radiation fan is arranged towards the isolation transformer.

The utility model provides a pair of explosion-proof isolation protection device for electricity consumption, output signal after through isolation transformer vary voltage, convey intelligent protection module after current transformer detects, control the power relay by intelligent protection module, the break-make of the normally closed contact of power relay controls the break-make of main circuit, thus realize the effective outage; if any line on the output side of the isolation transformer is touched by mistake, no harm is caused to human bodies due to the effect of the isolation transformer; when the current is too large to generate spark due to abnormality, the circuit is disconnected before the arc spark is expanded, the arc spark is limited to the minimum range to prevent ignition, and the device can be connected in series in the circuit to realize the function.

Drawings

Fig. 1 is a schematic circuit diagram of the explosion-proof isolation protection device for electricity.

Detailed Description

The utility model provides an explosion-proof isolation protection device for electricity consumption, as shown in figure 1, including input overcurrent protection switch S2, isolation transformer T1, current transformer TA, power relay K1, intelligent protection module, output overcurrent protection switch S3, input overcurrent protection switch S2' S input passes through wiring row H1 and connects double-phase commercial power (L looks, N looks), input overcurrent protection switch S2 is double-phase gang switch;

the output overcurrent protection switch is a mechanical mains supply/protection switching switch, a first path of an input side of the output overcurrent protection switch is a two-phase pin of a mains supply, and a second path of the input side of the output overcurrent protection switch is a two-phase pin of a protection circuit;

the output side of the input overcurrent protection switch is divided into two paths:

the first path is as follows: two pins at the output side of the input overcurrent protection switch S2 are connected to the first two-phase line pin of the mains supply at the input side of the output overcurrent protection switch S3 in a one-to-one correspondence manner: 2 feet and 4 feet;

and a second path: two pins at the output side of an input overcurrent protection switch S2 are correspondingly connected with two pins at the primary side of an isolation transformer T1 one by one, a first pin at the secondary side of the isolation transformer T1 is connected with a pin of a terminal 1 at the input side of a normally closed contact of a power relay K1, a current transformer TA is sleeved outside an electric connecting line between the first pin at the secondary side of the isolation transformer T1 and the pin of the terminal 1 at the input side of the normally closed contact of the power relay K1, a pin 3 at the output side of the normally closed contact of the power relay K1 is connected with a pin 6 at a first phase terminal of two pins of a second circuit protection circuit at the input side of an output overcurrent protection switch S3, and a pin 3 at a second phase terminal of two pins of a second circuit protection circuit at the input side of the output overcurrent;

two ends of the current transformer TA are connected with two input terminals of the intelligent protection module in a one-to-one correspondence manner; the control signal output end of the intelligent protection module is connected with a first end pin 5 of a coil of the power relay K1, and a second end pin 4 of the coil of the power relay K1 is grounded.

The intelligent protection module comprises an intelligent ammeter SM, a first intermediate relay KA1, a second intermediate relay KA2, a first time relay KT1 and a second time relay KT2, wherein two signal input terminals of the intelligent ammeter SM are connected with two ends of the current transformer TA in a one-to-one correspondence manner;

a short-circuit signal output end pin 5 of the intelligent ammeter SM is connected with a first end pin 8 of a coil of the second intermediate relay KA2, a second end pin 7 of the coil of the second intermediate relay KA2 is grounded, a second end pin 4 of a normally open contact of the second intermediate relay KA2 is connected with a 12V power supply, a first end pin 6 of the normally open contact of the second intermediate relay KA2 is connected with a first end pin 5 of the coil of the power relay K1, and a second end pin 4 of the coil of the power relay K1 is grounded;

an overload signal output end 14 pin of the intelligent ammeter SM is connected with a first end 14 pin of a coil of the first time relay KT1, and a second end 13 pin of the coil of the first time relay KT1 is grounded; the first end 5 feet of the normally open contact of the first time relay KT1 are connected with a 12V power supply, and the second end 9 feet of the normally open contact of the first time relay KT1 are divided into three paths: the first path is connected with a first end 14 pin of a coil of a second time relay KT2, and a second end 13 pin of the coil of the second time relay KT2 is grounded; the second path is connected with a first end 4 pin of a normally closed delay jump contact of a second time relay KT2, a second end 12 pin of the normally closed delay jump contact of the second time relay KT2 is connected with a first end 8 pin of a coil of a first intermediate relay KA1, and a second end 7 pin of the coil of the first intermediate relay KA1 is grounded; the third path is connected with a first end pin 6 of a first normally open contact of the first intermediate relay KA1, a second end pin 4 of the first normally open contact of the first intermediate relay KA1 is simultaneously connected with a 12V power supply and a second end pin 4 of the normally open contact of the second intermediate relay KA2, and a first end pin 6 of the normally open contact of the second intermediate relay KA2 is connected with a first end pin 5 of a coil of the power relay K1;

the first end 3 feet of the second normally open contact of the first intermediate relay KA1 is connected with a 12V power supply, and the second end 5 feet of the second normally open contact of the first intermediate relay KA1 is connected with the first end 5 feet of the coil of the power relay K1.

The explosion-proof isolation protection device for electricity consumption shown in fig. 1 further comprises an alarm module, wherein the alarm module comprises an insulation resistance measuring instrument H2 and an alarm horn;

the signal acquisition input end of the insulation resistance measuring instrument H2 comprises two pins 3 and 4, and the two pins 3 and 4 of the signal acquisition input end of the insulation resistance measuring instrument H2 are correspondingly connected with the two pins 6 and 3 of the second path of protection circuit at the input side of the output overcurrent protection switch S3;

two pins 6 and 8 of the alarm signal output end of the insulation resistance measuring instrument H2 are correspondingly connected with two power supply input ends of an alarm horn BZ 1.

The explosion-proof isolation protection device for electricity consumption shown in fig. 1 further comprises an overtemperature protection device, wherein the overtemperature protection device comprises a comparator U1, a reference voltage circuit, a thermistor, a temperature signal circuit and an overtemperature alarm circuit; the thermistor is connected to the socket P3;

the reference voltage circuit comprises a second resistor R2, a third resistor R3, an eighth resistor R8 and a ninth resistor R9, the second resistor R2 and the third resistor R3 are connected in parallel to form a first parallel circuit, the eighth resistor R8 and the ninth resistor R9 are connected in parallel to form a second parallel circuit, the first end of the first parallel circuit is connected with a 12V power supply, the second end of the first parallel circuit is connected with the first end of the second parallel circuit in series, and the second end of the second parallel circuit is grounded; the middle joint of the first parallel circuit and the second parallel circuit is connected with a pin 3 of a reference voltage input end of a comparator U1;

the temperature signal circuit comprises a fourth resistor R4, a sixth resistor R6 and a seventh resistor R7, wherein the sixth resistor R6, the seventh resistor R6 and the resistor R7 are connected in parallel to form a third parallel circuit; the first end of the thermistor is connected with a 12V power supply, the second end of the thermistor is connected with the first end of a fourth resistor R4, the second end of the fourth resistor R4 is connected with the first end of a third parallel circuit, and the second end of the third parallel circuit is grounded; the fourth resistor R4 and the middle joint of the first end of the third parallel circuit are connected with the pin 2 of the temperature signal input end of the comparator U1;

the overtemperature alarm circuit comprises a fifth resistor R5, a first resistor R1, a first triode Q1, an overtemperature alarm buzzer BZ2 and a first diode D1, wherein the first triode Q1 is a PNP type triode, the first resistor R1 is connected between an emitter and a base of the first triode Q1, the emitter of the first triode Q1 is connected with a 12V power supply, the base of the first triode Q1 is connected with the fifth resistor R5 in series and then connected with a pin 1 of an alarm signal output end of a comparator U1, a collector of the first triode Q1 is connected with a first end of the overtemperature alarm buzzer BZ2, and a second end of the overtemperature alarm buzzer BZ2 is grounded; the positive electrode of the first diode D1 is connected with the second end of the overtemperature alarm buzzer BZ2, and the negative electrode of the first diode D1 is connected with the first end of the overtemperature alarm buzzer BZ 2; the collecting electrode of the first triode Q1 is also connected with the overtemperature signal input end of the intelligent protection module, namely the first end 14 pin (connected through NET1 point) of the coil of the first time relay KT 1.

The explosion-proof isolation protection device for electricity consumption shown in fig. 1 further includes a heat dissipation circuit, the heat dissipation circuit includes a heat dissipation fan F and a first switch S1, a first end of the first switch S1 is connected to the 12V power supply, a second end of the first switch S1 is connected to a first connection terminal of the heat dissipation fan F, and a second connection terminal of the heat dissipation fan is grounded; the wind direction of the cooling fan F is arranged towards the isolation transformer and used for cooling the isolation transformer.

The explosion-proof isolation protection device for power consumption shown in fig. 1 further comprises an arc extinguishing circuit, wherein the arc extinguishing circuit comprises an arc extinguisher, and the arc extinguisher is connected in series with the first phase line of the output side of the output overcurrent protection switch S3.

In this embodiment, the comparator U1 is LM 358.

The technical scheme is that a standby power supply PW is further arranged, two output pins of the standby power supply PW are connected with two output side pins of an input overcurrent protection switch S2 in a one-to-one correspondence mode, the two output pins of the standby power supply PW are further connected with two phase pins of a second circuit protection circuit on the input side of an output overcurrent protection switch S3 in a one-to-one correspondence mode, and phase line connection relations between the two output pins of the standby power supply PW, the two output side pins of the input overcurrent protection switch S2 and the two phase pins of the second circuit protection circuit on the input side of an output overcurrent protection switch S3 are kept consistent with phase line connection relations in connection of the two phase pins of the second circuit on the output side of an input overcurrent protection switch S2 and the two phase pins of the second circuit on the input side.

The technical scheme specifically works as follows:

the input side of the output overcurrent protection switch S3 is switched to a second path of protection circuit, the main circuit is electrified, electric energy is sent into an isolation transformer T1 from an input overcurrent protection switch S2, commercial power is isolated, the commercial power passes through a current transformer TA, a power relay K1 and then passes through an output overcurrent protection switch S3, an arc extinguishing module is output through a binding post H1, and due to the effect of the isolation transformer T1, a human body touches any phase line at the output end, and the human body is not damaged.

The intelligent ammeter SW judges the current transmitted by the current transformer TA and determines whether to output a control signal according to a threshold value preset by the intelligent ammeter SW. The control signals are divided into two categories:

and 1, outputting an emergency stop signal output in the short circuit through a pin 5 of the intelligent ammeter SW.

And 2, outputting the slow stop signal output by the overload through a pin 14 of the intelligent ammeter SW.

Scram signal control second intermediate relay KA2, during the 5 foot output scram signals of intelligence ampere meter SW, the coil of second intermediate relay KA2 gets electric, the actuation of the 6 feet of normally open contact and the 4 feet of second intermediate relay KA2, the 6 feet of second intermediate relay KA2 get electric, carry the first end of current to power relay K1's coil, power relay K1's normally closed contact's 1, 2 feet disconnection, the main circuit outage, this process time delay is very short, enlarge with the fault-protected area.

The slow stop signal controls the first time relay KT1, the second time relay KT2 and the first intermediate relay KA1, and the link combination of constitution is in case receive the slow stop signal and just begins work, and the course of operation is: the slow stop signal carries the 14 feet of first time relay KT1 from the 14 feet of intelligent ampere meter, and the coil of relay KT1 gets electric, begins the timing, sets for the time delay back according to the time delay, and first time relay KT1 normally open contact 9 feet and 5 feet actuation, 12V power is connected to 5 feet, therefore 12V voltage is exported to 9 feet of first time relay KT1, 4 feet and 14 feet of 12V voltage loading second time relay KT 2: 4 feet of a second time relay KT2 are powered on, 4 feet and 12 feet of KT2 are in a normally closed state, timing is started after 14 feet of a KT2 coil are powered on, only 4 feet and 12 feet of KT2 are disconnected after time delay time is up, 12V voltage reaches 8 feet of one end of a first intermediate relay KA1 coil through 4 feet and 12 feet of KT2 in time delay, a first intermediate relay KA1 is powered on to act, 5 feet and 3 feet at two ends of a second normally-open contact of the first intermediate relay KA1 are attracted, 3 feet of the first intermediate relay KA1 are connected with a 12V power supply, 5 feet of a first intermediate relay KA1 are powered on and are conveyed to a first end of a power relay K1 coil through a lead, the power relay K1 coil is powered on to act, 1 foot and 3 feet of the normally-closed contact are disconnected, and a main circuit is cut off; when 12V voltage is carried to second time relay KT 2's 14 feet to first time relay KT1 normally open contact 9 feet, second time relay KT 2's coil is electrified, second time relay KT2 begins the time delay timing, the time delay arrives, second time relay KT2 normally closed contact's 4 feet and 12 feet disconnection, so 8 feet of coil one end 8 of first auxiliary relay KA1 outage, 3 feet at first auxiliary relay KA1 normally closed contact both ends, 5 feet disconnection, thereby make power relay K1 coil power-off reset, the main circuit resumes the switch-on.

The above process is time-delay turn-off, and the turn-off is followed by time-delay turn-on.

The process of protecting the power supply after the power supply is turned off and then delaying the power supply is as follows: after a first end pin 14 of a coil of a first time relay KT1 obtains a slow stop signal, when power-off protection is started after the time delay of the first time relay KT1 is finished, a pin 9 of the first time relay KT1 is connected with a pin 5, the signal is sent to a pin 14 of a second time relay KT2, the time delay of the second time relay KT2 is started, the time delay period of the second time relay KT2 is the time for a power relay K1 to turn off a main circuit to output protection and power off, the time delay of the second time relay KT2 is up, the second time relay KT2 acts to disconnect a pin 12 and a pin 4 of a normally closed contact of the second time relay KT2, the first intermediate relay KA1 is reset in a power loss state, a pin 5 of the first intermediate relay KA1 outputs a low level to reset the power relay K1, a pin 1 and a pin 3 of a normally closed contact of the power relay K1 are connected, and finally.

The overtemperature alarm module works: the comparator U1 adopts LM358, the resistance R2, R3, R8, R9 constitute bleeder circuit and provide reference voltage for comparator U1, the P3 socket inserts the thermistor, thermistor and resistance R4, R6, R7 constitute the temperature sampling circuit, 2 feet that input comparator after the temperature value of sampling converts to the voltage, with 3 feet reference voltage comparisons, if the temperature is transfinited, comparator U1 exports the alarm signal of low level from 1 foot, triode Q1 switches on, buzzer BZ2 reports to the police, the high level signal that the node NET1 obtained simultaneously is exported 14 feet of the coil of the first time relay KT1 of intelligent control module, intelligent control module begins the time delay protection.

The utility model discloses after overtemperature alarm module's overtemperature alarm signal carried to intelligent protection module, intelligent protection module's working process was the same with it receives aforementioned slow stop signal, no longer gives unnecessary details here.

In order to prevent fire caused by electric spark, an arc extinguishing module is also provided, which can reduce the electric spark to the extent that it cannot cause fire.

The insulation resistance tester H2 monitors the insulation degree between the output of the main circuit and the casing (or the input ground), and if the insulation is lower than a standard value, an alarm can be given to prompt attention to safety.

In conclusion, it can be seen that: in the technical scheme, the main circuit is electrified, the isolation transformer T1 isolates and outputs the commercial power, and any line at the output end is struck under the action of the isolation transformer T1, so that the main circuit has no harm to a human body. The main switch is served by a high-power relay K1, a current transformer TA detects the current of the circuit, generates a current sampling signal and sends the current sampling signal to an intelligent ammeter for processing, if the current of the circuit exceeds the safety requirement, the intelligent ammeter generates an output signal and sends the output signal to an intelligent control module, and the intelligent control module controls the action of the power relay K1 to cut off the power consumption. The safe power utilization of the user is guaranteed. Furthermore, the device may be equipped with an explosion proof housing. The safety power utilization of users is ensured, combustion or explosion cannot be caused in the flammable and explosive environment, the generated electric spark is sealed in the explosion-proof body box, and external combustible substances cannot invade the box body to damage electrical equipment.

The device adopts a power isolation 1:1 transformer T1 and an arc extinguishing circuit, and is characterized by double protection, can effectively play a role in protection in different aspects under the conditions of micro current and overload large current, and has an adjustable current-limiting protection threshold value. Under the condition of low current even leakage current, can not cut off the power supply and can not take place electric shock danger, can ensure load normal operating, when environment or organism temperature rise to the early warning temperature, can report to the police and automatic cutout circuit, protection power consumption safety. When the circuit or the load is overloaded, the protector cuts off the power supply, protects the circuit and the load from being damaged and prevents fire from happening. The magnitude of each stage of the overcurrent can be adjusted according to the practical application environment. The power supply is cut off before the danger is ensured. The process has electric arc generation and long time, and is easy to cause fire. Therefore, the explosion-proof shell is additionally arranged outside the device, and the explosion-proof effect is achieved.

The utility model discloses a user provides nimble safe consumer, all plays good effect in the aspect of protection against electric shock, explosion-proof etc.

The product is composed of an explosion-proof shell protection body, an isolation transformer serves as a core component of power supply equipment inside the explosion-proof shell protection body, and an intermediate relay, a time relay, a power relay, a current sensor, an intelligent ammeter, a temperature sensor, an alarm buzzer and a circuit breaker are arranged in the explosion-proof shell protection body.

2, in setting for the temperature range, in setting for the power within range, this equipment can normal operating, and when surpassing the settlement parameter, this equipment can the early warning, and operating condition can cut off the power supply line immediately when surpassing the limit, guarantees safety.

The utility model discloses output and earth insulation, if the human body touches arbitrary one end of output, can not cause the electric shock accident, than traditional power supply equipment safety, again because this device adopts explosion-proof shell, can be used in inflammable and explosive environment and can not arouse the accident, reduce electric arc furthest, the prevention conflagration. This function can be achieved by connecting the device in series in the circuit.

The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and all should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (3)

1. The utility model provides an explosion-proof isolation protection device of power consumption which characterized in that: the intelligent protection device comprises an input overcurrent protection switch, an isolation transformer, a current transformer, a power relay, an intelligent protection module, an alarm module and an overtemperature protection device; the input end of the input overcurrent protection switch is used for being connected with a mains supply, the output overcurrent protection switch is a mechanical mains supply/protection switching switch, the first path of the input side of the output overcurrent protection switch is a two-phase pin of the mains supply, and the second path of the input side of the output overcurrent protection switch is a two-phase pin of a protection circuit;

the output side of the input overcurrent protection switch is divided into two paths: the first path is as follows: two pins at the output side of the input overcurrent protection switch are connected with a first path of commercial power two-phase line pin at the input side of the output overcurrent protection switch in a one-to-one correspondence manner;

and a second path: the two pins of the output side of the input overcurrent protection switch are correspondingly connected with the two pins of the primary side of the isolation transformer one by one, the first pin of the secondary side of the isolation transformer is connected with the input side terminal of the normally closed contact of the power relay, the current transformer is sleeved outside an electric connection line between the first pin of the secondary side of the isolation transformer and the input side terminal of the normally closed contact of the power relay in a penetrating way, the output side terminal of the normally closed contact of the power relay is connected with the first phase line terminal of the two pins of the second path of protection circuit of the input side of the output overcurrent protection switch, and the second phase line terminal of the two pins of the second path of protection circuit of the input;

two ends of the current transformer are connected with two input terminals of the intelligent protection module in a one-to-one correspondence manner; the control signal output end of the intelligent protection module is connected with the first end of the coil of the power relay, and the second end of the coil of the power relay is grounded;

the intelligent protection module comprises an intelligent ammeter, a first intermediate relay KA1, a second intermediate relay KA2, a first time relay KT1 and a second time relay KT2, wherein two signal input terminals of the intelligent ammeter are connected with two ends of the current transformer in a one-to-one correspondence manner;

the short-circuit signal output end of the intelligent ammeter is connected with the first end of a coil of the second intermediate relay KA2, the second end of the coil of the second intermediate relay KA2 is grounded, the second end 4 pins of a normally open contact of the second intermediate relay KA2 are connected with a 12V power supply, the first end 6 pins of the normally open contact of the second intermediate relay KA2 are connected with the first end of the coil of the power relay, and the second end of the coil of the power relay is grounded;

the overload signal output end of the intelligent ammeter is connected with the first end of a coil of the first time relay, and the second end of the coil of the first time relay is grounded; the first end of the normally open contact of the first time relay is connected with a 12V power supply, and the second end of the normally open contact of the first time relay is divided into three paths: the first path is connected with the first end of a coil of the second time relay, and the second end of the coil of the second time relay is grounded; the second path is connected with the first end of the normally closed delay jump joint of the second time relay, the second end of the normally closed delay jump joint of the second time relay is connected with the first end of the coil of the first intermediate relay, and the second end of the coil of the first intermediate relay is grounded; the third path is connected with the first end of the first normally open contact of the first intermediate relay, the second end of the first normally open contact of the first intermediate relay is simultaneously connected with the 12V power supply and the second end of the normally open contact of the second intermediate relay, and the first end of the normally open contact of the second intermediate relay is connected with the first end of the coil of the power relay;

the first end of a second normally open contact of the first intermediate relay is connected with a 12V power supply, and the second end of the second normally open contact of the first intermediate relay is connected with the first end of a coil of the power relay;

the alarm module comprises an insulation resistance measuring instrument H2 and an alarm horn;

the signal acquisition input end of the insulation resistance measuring instrument H2 comprises two pins, and the two pins of the signal acquisition input end of the insulation resistance measuring instrument H2 are connected with the two pins of the second path of protection circuit on the input side of the output overcurrent protection switch in a one-to-one correspondence manner;

two pins of an alarm signal output end of the insulation resistance measuring instrument H2 are correspondingly connected with two power supply input ends of the alarm horn;

the overtemperature protection device comprises a comparator, a reference voltage circuit, a thermistor, a temperature signal circuit and an overtemperature alarm circuit;

the reference voltage circuit comprises a second resistor, a third resistor, an eighth resistor and a ninth resistor, the second resistor and the third resistor are connected in parallel to form a first parallel circuit, the eighth resistor and the ninth resistor are connected in parallel to form a second parallel circuit, the first end of the first parallel circuit is connected with a 12V power supply, the second end of the first parallel circuit is connected with the first end of the second parallel circuit in series, and the second end of the second parallel circuit is grounded; the middle joint of the first parallel circuit and the second parallel circuit is connected with the reference voltage input end of the comparator;

the temperature signal circuit comprises a fourth resistor, a sixth resistor and a seventh resistor, and the sixth resistor and the seventh resistor are connected in parallel to form a third parallel circuit; the first end of the thermistor is connected with a 12V power supply, the second end of the thermistor is connected with the first end of a fourth resistor R4, the second end of the fourth resistor R4 is connected with the first end of a third parallel circuit, and the second end of the third parallel circuit is grounded; the intermediate joint of the fourth resistor R4 and the first end of the third parallel circuit is connected with the temperature signal input end of the comparator;

the overtemperature alarm circuit comprises a fifth resistor, a first triode, an overtemperature alarm buzzer and a first diode, wherein the first triode is a PNP type triode, the first resistor is connected between an emitting electrode and a base electrode of the first triode, the emitting electrode of the first triode is connected with a 12V power supply, the base electrode of the first triode is connected with the alarm signal output end of the comparator after being connected with the fifth resistor in series, a collector electrode of the first triode is connected with the first end of the overtemperature alarm buzzer, and the second end of the overtemperature alarm buzzer is grounded; the anode of the first diode is connected with the second end of the over-temperature alarm buzzer, and the cathode of the first diode is connected with the first end of the over-temperature alarm buzzer; the collector of the first triode is also connected with the overtemperature signal input end of the intelligent protection module, and the overtemperature signal input end is the first end of the coil of the first-time relay.

2. The electrical explosion-proof isolation protection device of claim 1, wherein: the comparator model uses LM 358.

3. The electrical explosion-proof isolation protection device of claim 1, wherein: the heat dissipation circuit comprises a heat dissipation fan and a first switch, wherein the first end of the first switch is connected with a 12V power supply, the second end of the first switch is connected with a first wiring terminal of the heat dissipation fan, and a second wiring terminal of the heat dissipation fan is grounded; the wind direction of the heat radiation fan is arranged towards the isolation transformer.

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