Explosion-proof control system

Abstract

The utility model discloses an explosion-proof control system which comprises a plurality of temperature sensors, an automatic switch and a controller, each temperature sensor corresponds to an electric heat tracing loop, and the temperature sensors are used for detecting the temperature of the electric heat tracing loops; one automatic switch is arranged in one electric heat tracing loop, and the temperature sensors and the automatic switches are arranged in a one-to-one correspondence manner; the controller is provided with a first terminal and a second terminal, the first terminal is provided with a plurality of temperature interfaces, one temperature interface is connected with one temperature sensor, the second terminal is provided with a plurality of control interfaces, one control interface is connected with one automatic switch, and the temperature interfaces and the control interfaces are connected in a one-to-one correspondence mode. When the temperature of the electric heat tracing loop exceeds the preset temperature, the controller disconnects the electric heat tracing loop based on the automatic switch. According to the technical scheme, response can be effectively made in time after the temperature of each electric heat tracing loop abnormally rises, the situation of continuous heating of the loops is reduced, and safety accidents are reduced.

Description

Explosion-proof control system Technical Field

[0001] This utility model relates to the field of explosion-proof technology, specifically to an explosion-proof control system. Background Technology

[0002] In industrial production and many fields involving pipeline transportation and equipment operation, heat tracing systems play a vital role. Especially in dangerous environments with flammable and explosive gases, dust, etc., the safety and stability of explosion-proof heat tracing systems are crucial to production safety and the normal operation of equipment.

[0003] Traditional electric heat tracing circuit temperature control methods are relatively simple and crude. Previous technical solutions typically lacked precise temperature monitoring methods, making it impossible to perform targeted temperature detection for each electric heat tracing circuit and accurately control the real-time temperature of each circuit. When the temperature of a particular electric heat tracing circuit rises abnormally, the system cannot react promptly and effectively, leading to continuous heating of the circuit. This can easily cause serious safety accidents such as equipment failure, fire, or even explosion, posing a significant threat to life and property safety. Summary of the Invention

[0004] In view of the deficiencies in the existing technology, the explosion-proof control system provided by this utility model can effectively respond in a timely manner when the temperature of each electric heat tracing circuit rises abnormally, thereby reducing the continuous heating of the circuit and reducing safety accidents.

[0005] This utility model provides an explosion-proof control system, which includes:

[0006] A temperature sensor is provided, and multiple temperature sensors are provided. Each temperature sensor corresponds to an electric heat tracing circuit. The temperature sensor is used to detect the temperature of the electric heat tracing circuit.

[0007] Automatic switches are provided, and multiple automatic switches are provided. One of the automatic switches is provided in one of the electric heat tracing circuits. The temperature sensor and the automatic switch are provided in a one-to-one correspondence.

[0008] The controller has a first terminal and a second terminal. The first terminal has multiple temperature interfaces, one of which is connected to a temperature sensor. The second terminal has multiple control interfaces, one of which is connected to an automatic switch. The temperature interfaces and the control interfaces are connected in a one-to-one correspondence. When the temperature of the electric heat tracing circuit exceeds a preset temperature, the controller disconnects the electric heat tracing circuit based on the automatic switch.

[0009] In one aspect, the explosion-proof control system further includes a display screen connected to the controller, the display screen being used to display the parameters of the electric heat tracing circuit when the temperature exceeds the preset temperature.

[0010] In one aspect, the explosion-proof control system also includes a number of manual switches, which are disposed in the electric heat tracing circuit, with one manual switch connected in parallel with one automatic switch.

[0011] In one aspect, the explosion-proof control system further includes a communication terminal connected to the controller, the communication terminal being used for network communication.

[0012] In one aspect, the explosion-proof control system further includes a fault circuit, which is connected in parallel with the electric heat tracing circuit. The fault circuit includes an alarm switch and an explosion-proof buzzer, which are connected in series.

[0013] The controller is equipped with a comprehensive fault terminal, which is connected to the alarm switch to control the on / off state of the alarm switch.

[0014] In one aspect, the explosion-proof control system further includes a plurality of leakage circuit breakers, with one leakage circuit breaker corresponding to each of the electric heat tracing circuits.

[0015] In one aspect, the explosion-proof control system further includes a number of indicator lights, with one indicator light provided in each of the electric heat tracing circuits.

[0016] In one aspect, the explosion-proof control system further includes a main circuit breaker located between the electric heat tracing circuit and the power source.

[0017] In one aspect, the explosion-proof control system also includes a main indicator light connected in series with the main circuit breaker.

[0018] In one aspect, the explosion-proof control system further includes a plurality of AC contactors, one of which is provided in each of the electric heat tracing circuits, and the AC contactors are connected in series with the leakage current circuit breaker.

[0019] The beneficial effects of this invention are as follows: by setting multiple temperature sensors, each corresponding to one electric heat tracing circuit, the temperature of each electric heat tracing circuit can be accurately detected. The controller is connected to the temperature sensors through a temperature interface to acquire temperature data in real time. When the temperature of the electric heat tracing circuit exceeds a preset value, the controller can quickly disconnect the circuit based on the corresponding automatic switch, promptly preventing the circuit from continuing to heat up. This reduces the probability of safety accidents.

[0020] Furthermore, by connecting the controller to temperature sensors and automatic switches one-to-one, precise control of each electric heat tracing circuit is achieved. Preset temperatures can be flexibly set according to the needs of different circuits, meeting diverse heat tracing requirements. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0022] Figure 1 is a schematic diagram showing the connection between the controller and the display screen of the explosion-proof control system of this utility model;

[0023] Figure 2 is a schematic diagram of the circuit connection of the explosion-proof control system of this utility model;

[0024] Figure 3 is a schematic diagram of the circuit switching principle of the explosion-proof control system of this utility model.

[0025] Figure Descriptions: 10. Temperature sensor; 20. Controller; 210. First terminal; 220. Second terminal; 230. Comprehensive fault terminal; 30. Electric heat tracing circuit; 40. Display screen; 50. Fault circuit; QF. Main circuit breaker; QF1. First residual current circuit breaker; QF2. Second residual current circuit breaker; QF3. Third residual current circuit breaker; QF4. Fourth residual current circuit breaker; QF5. Fifth residual current circuit breaker; QF6. Sixth residual current circuit breaker; QF7. Seventh residual current circuit breaker; QF8. Eighth residual current circuit breaker; QF9. Ninth residual current circuit breaker; QF10. Tenth residual current circuit breaker; K. Alarm switch; K1. First automatic switch; K2. Second automatic switch; K3. Third automatic switch; K4. Fourth automatic switch; K5. Fifth automatic switch; K6. Sixth automatic switch; K7. 7. Automatic switch; K8, 8th automatic switch; K9, 9th automatic switch; K10, 10th automatic switch; KM1, 1st AC contactor; KM2, 2nd AC contactor; KM3, 3rd AC contactor; KM4, 4th AC contactor; KM5, 5th AC contactor; KM6, 6th AC contactor; KM7, 7th AC contactor; KM8, 8th AC contactor; KM9, 9th AC contactor; KM10, 10th AC contactor; HG, main indicator light; HG1, 1st indicator light; HG2, 2nd indicator light; HG3, 3rd indicator light; HG4, 4th indicator light; HG5, 5th indicator light; HG6, 6th indicator light; HG7, 7th indicator light; HG8, 8th indicator light; HG9, 9th indicator light; HG10, 10th indicator light; FM, explosion-proof buzzer. Detailed Implementation

[0026] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0027] It should be noted that, unless otherwise stated, the technical or scientific terms used in this utility model shall have the ordinary meaning as understood by those skilled in the art to which this utility model pertains.

[0028] Please refer to Figures 1 to 3. This embodiment of the invention provides an explosion-proof control system that can be applied in low-temperature environments, such as sub-zero conditions. For example, in oil pipelines, to prevent oil from condensing in the pipeline, an electric heat tracing circuit 30 is used to heat the pipeline. The explosion-proof control system includes: a temperature sensor 10, an automatic switch, and a controller 20.

[0029] Multiple temperature sensors 10 are provided, and each temperature sensor 10 corresponds to an electric heat tracing circuit 30. The temperature sensor 10 is used to detect the temperature of the electric heat tracing circuit 30. Through multiple temperature sensors 10, the working status of each electric heat tracing circuit 30 can be accurately grasped, and each temperature sensor 10 can establish a corresponding relationship with an electric heat tracing circuit 30 to detect the real-time temperature of the corresponding electric heat tracing circuit 30.

[0030] In industrial production, different electric heat tracing circuits 30 may have different operating requirements and load conditions, and their temperature changes will also vary. For example, in chemical production, the characteristics of the media in different pipelines are different, and the required heat tracing temperature is also different. By equipping each electric heat tracing circuit 30 with a separate temperature sensor 10, the temperature information of each circuit can be obtained in real time and accurately, so as to make precise control according to the actual situation.

[0031] Multiple automatic switches are configured, one for each electric heat tracing circuit 30. Temperature sensors 10 and automatic switches are configured in a one-to-one correspondence. The automatic switches control the on / off state of the electric heat tracing circuits 30. When a temperature sensor 10 detects an abnormal temperature in a particular electric heat tracing circuit 30, the corresponding automatic switch will act accordingly based on the control command, thus controlling the on / off state of that circuit. This one-to-one correspondence ensures that the system can perform independent and precise control over each circuit, preventing an abnormality in one circuit from affecting the normal operation of other circuits. For example, in a large pipeline system containing multiple electric heat tracing circuits 30, when the temperature of one circuit becomes too high, the corresponding automatic switch can quickly shut off that circuit without affecting the continued normal operation of other circuits.

[0032] The controller 20 has a first terminal 210 and a second terminal 230. The first terminal 210 has multiple temperature interfaces, each connected to a temperature sensor 10. The second terminal 230 has multiple control interfaces, each connected to an automatic switch. The temperature interfaces and control interfaces are connected in a one-to-one correspondence. When the temperature of the electric heat tracing circuit 30 exceeds a preset temperature, the controller 20 automatically disconnects the electric heat tracing circuit 30 based on the automatic switch. The controller 20 can receive temperature data from each temperature sensor 10 and send control signals to the automatic switch through the control interfaces. There is a one-to-one correspondence between the temperature interfaces and the control interfaces. When the controller 20 determines that the temperature of a certain electric heat tracing circuit 30 exceeds a preset temperature value, it will send a command to the automatic switch through the corresponding control interface, causing the automatic switch to disconnect the electric heat tracing circuit 30.

[0033] The controller 20 integrates the temperature information from the temperature sensor 10, makes judgments and decisions based on preset rules, and controls the automatic switching action to achieve intelligent control of the electric heat tracing circuit 30. This enables the system to automatically adjust the working state of the electric heat tracing circuit 30 according to the actual temperature conditions, ensuring the safety and stability of the system operation.

[0034] In this embodiment, by setting multiple temperature sensors 10, each corresponding to an electric heat tracing circuit 30, the temperature of each circuit can be accurately detected. The controller 20 is connected to the temperature sensors 10 through a temperature interface to acquire temperature data in real time. When the temperature of the electric heat tracing circuit 30 exceeds a preset value, the controller 20 can quickly disconnect the circuit based on the corresponding automatic switch, promptly preventing the circuit from continuing to heat. For example, in the scenario of heat tracing for petrochemical pipelines, it can effectively avoid dangers such as material deterioration, pipeline damage, or even explosions caused by excessively high local temperatures, ensuring production safety and normal equipment operation.

[0035] Explosion-proof control systems also significantly reduce the probability of safety accidents through precise temperature monitoring and timely loop disconnection control. Compared with traditional technologies, they reduce the risk of equipment failure, fire, or explosion caused by abnormal temperatures, protecting the lives and property of personnel, and are especially suitable for industries with extremely high safety requirements, such as oil, natural gas, and chemicals.

[0036] Traditional heat tracing systems employ simple and rudimentary control methods. In contrast, the explosion-proof control system's controller 20 is connected one-to-one with temperature sensors 10 and automatic switches, enabling precise control of each electric heat tracing loop 30. Preset temperatures can be flexibly set according to the needs of different loops, meeting diverse heat tracing requirements. In pipelines transporting different materials, appropriate temperature control ranges can be set based on material characteristics, improving heat tracing effectiveness while avoiding energy waste.

[0037] In one embodiment of this application, the explosion-proof control system further includes a display screen 40, which is connected to the controller 20. The display screen 40 is used to display the parameters of the electric heat tracing circuit 30 when the temperature exceeds a preset temperature. When the temperature exceeds the preset temperature, the display screen 40 will immediately display the parameters of the electric heat tracing circuit 30. Operators can directly obtain this information, such as the circuit number, real-time temperature, and current, to promptly detect system abnormalities and take measures to prevent the fault from escalating, such as timely inspection of the heat tracing equipment and investigation of the cause of the excessively high temperature.

[0038] Furthermore, by analyzing temperature change trends and comparing normal operating parameters, maintenance personnel can quickly locate the fault point, determining whether it is a faulty temperature sensor 10, a damaged heating cable, or other reasons causing the abnormal temperature, thus improving maintenance efficiency and reducing equipment downtime. Moreover, with the data provided by the display screen 40, staff can gain a deeper understanding of the operating status of each electric heating circuit 30, and subsequently optimize the system. For example, they can adjust the preset temperature value based on the actual temperature conditions, or rationally allocate energy based on parameters such as current, achieving energy saving and efficiency improvement.

[0039] In one embodiment of this application, the explosion-proof control system further includes a manual switch. Multiple manual switches are provided and are distributed in the electric heat tracing circuit 30. One manual switch is connected in parallel with an automatic switch.

[0040] In the event of a malfunction in the automatic control system, such as a failure of controller 20 or abnormal signal transmission from temperature sensor 10, manual switching can be a crucial means of ensuring the safe operation of the system. Operators can directly and manually disconnect or close the electric heat tracing circuit 30 to avoid dangers caused by automatic control failure, such as the risk of explosion that may be caused by a continuous rise in temperature; timely manual circuit closure can effectively prevent such risks.

[0041] In one embodiment of this application, the explosion-proof control system further includes a communication terminal connected to the controller 20 and used for network communication. With the help of network communication, the operating status of the electric heat tracing circuit 30 can be remotely monitored via terminals such as computers and mobile phones. Parameters such as temperature and current can be acquired in real time to promptly detect abnormalities. When an abnormal temperature is detected, the circuit can be remotely controlled to automatically disconnect the circuit, preventing the danger from escalating and improving work efficiency and safety.

[0042] The communication terminal transmits a large amount of collected operational data to the cloud or management platform for convenient storage and analysis. Analysis of historical data provides insights into system operating patterns and allows for the timely identification of potential problems. For example, analyzing temperature trends can predict equipment failures, enabling proactive maintenance and reducing the failure rate.

[0043] The communication terminal also supports integration of the explosion-proof control system with other related systems, enabling data sharing and collaborative operation. When linked with a fire alarm system, it automatically triggers an alarm and initiates corresponding fire-fighting measures upon detecting abnormally high temperatures that may cause a fire, enhancing the overall safety and reliability of the system.

[0044] In one embodiment of this application, the explosion-proof control system further includes a fault circuit 50, which is connected in parallel with the electric heat tracing circuit 30. The fault circuit 50 includes an alarm switch K and an explosion-proof buzzer FM, which are connected in series. The controller 20 is provided with a comprehensive fault terminal, which is connected to the alarm switch K to control the on / off state of the alarm switch K. When a fault occurs in the electric heat tracing circuit 30, such as when the temperature exceeds a preset value or there is a leakage, the controller 20 will respond. The controller 20 controls the alarm switch K to close through the comprehensive fault terminal. At this time, the explosion-proof buzzer FM in the fault circuit 50 will emit an audible alarm. Since the fault circuit 50 is connected in parallel with the electric heat tracing circuit 30, this design can ensure that when an abnormality occurs in the electric heat tracing circuit 30, an alarm signal is quickly issued to attract the attention of on-site personnel, allowing staff to be aware of the system fault in a timely manner and buy time for subsequent measures. For example, in a petrochemical production environment, where there are many on-site devices and high noise levels, the alarm sound emitted by the explosion-proof buzzer FM can effectively remind staff that a fault has occurred, preventing the fault from continuing to develop and causing more serious consequences.

[0045] In one embodiment of this application, the explosion-proof control system further includes several residual current circuit breakers (RCCBs), with one RCCB corresponding to each electric heat tracing circuit 30. During the operation of the electric heat tracing circuit 30, if a leakage occurs, the corresponding RCCB will quickly trip, cutting off the circuit current. In flammable and explosive environments such as chemical plants and oil and gas plants, leakage may ignite electrical sparks, potentially leading to explosions and other serious accidents. The RCCB can promptly interrupt leakage current, preventing electric shock injuries and equipment damage, effectively reducing safety risks, and providing reliable safety assurance for the production environment.

[0046] Each electric heat tracing circuit 30 is independently equipped with a residual current circuit breaker (RCCB), allowing for precise identification of the faulty circuit in the event of a leakage fault. Compared to multiple circuits sharing a single RCCB, this setup significantly reduces troubleshooting time. Maintenance personnel can quickly locate the faulty circuit 50 for targeted repairs, minimizing equipment downtime and improving production efficiency.

[0047] In one embodiment of this application, the explosion-proof control system further includes several indicator lights, with one indicator light installed in each electric heat tracing circuit 30. The indicator lights can reflect the working status of the electric heat tracing circuit 30 in real time and intuitively. When an indicator light is lit, it indicates that the circuit is working; when the indicator light is off, it indicates that the circuit is stopped. Personnel can quickly view multiple indicator lights from a distance to understand the operating status of each circuit without having to approach the equipment to check them one by one, thus improving work efficiency. Personnel can quickly grasp the operating status of the entire electric heat tracing system and promptly detect abnormalities by observing the indicator lights.

[0048] In conjunction with other fault detection equipment, indicator lights help workers more accurately diagnose faults. For example, if the temperature sensor 10 of an electric heat tracing circuit 30 sends a fault signal and the indicator light for that circuit goes out, workers can initially determine that the circuit may have stopped working and requires further inspection. This provides important clues for troubleshooting, helping maintenance personnel quickly locate and resolve problems.

[0049] When operating equipment, indicator lights can remind workers of the circuit's energized status. Before performing inspections, maintenance, or other operations, workers can observe the indicator lights to confirm whether the circuit is de-energized, preventing accidents such as electric shock due to misoperation. This provides operators with additional safety assurance and reduces operational risks.

[0050] In one embodiment of this application, the explosion-proof control system further includes a main circuit breaker QF, which is disposed between the electric heat tracing circuit 30 and the power supply. The main circuit breaker QF, disposed between the electric heat tracing circuit 30 and the power supply in the explosion-proof control system, is crucial for the safe operation of the entire system.

[0051] In the event of a serious malfunction in the electric heat tracing circuit 30, such as a short circuit or overload, which could potentially cause a fire or explosion, the main circuit breaker QF can quickly cut off the power supply, preventing current from continuing to flow into the circuit. During production, electrical sparks generated by a short circuit in the electric heat tracing system may ignite surrounding flammable and explosive gases. The timely disconnection of the power supply by the main circuit breaker QF can prevent such dangers, protect equipment and personnel safety, and prevent further escalation of the accident.

[0052] In addition, when maintaining or repairing the electric heat tracing system, closing the main circuit breaker QF will cut off the power supply to the entire system, making the electric heat tracing circuit 30 de-energized. This creates safe working conditions for maintenance personnel, preventing electric shock accidents caused by accidental contact with live parts during operation, and ensuring the personal safety of maintenance personnel.

[0053] The main circuit breaker QF has overload and short-circuit protection functions and can monitor the current of the electric heat tracing circuit 30. When an overload or short circuit occurs in the circuit and the current exceeds the rated current of the main circuit breaker QF, it will automatically trip and disconnect the circuit to protect the power supply and electric heat tracing equipment from damage caused by overload and short-circuit current surges, extend the service life of the equipment, and reduce the equipment failure rate and maintenance costs.

[0054] In one embodiment of this application, the explosion-proof control system further includes a main indicator light HG, which is connected in series with the main circuit breaker QF. The state of the main indicator light HG can intuitively reflect the on / off status of the main circuit breaker QF, thereby displaying the power supply status of the entire explosion-proof control system. When the main indicator light HG is lit, it indicates that the main circuit breaker QF is closed and the system is receiving power; when the main indicator light HG is off, it means that the main circuit breaker QF is open and the system is not receiving power. In complex industrial environments, operators can quickly determine the system's power supply status remotely without needing to approach the main circuit breaker QF, improving work efficiency.

[0055] In one embodiment of this application, the explosion-proof control system further includes a plurality of AC contactors, with one AC contactor installed in each electric heat tracing circuit 30, and the AC contactor connected in series with a residual current circuit breaker. In the explosion-proof control system, each electric heat tracing circuit 30 is equipped with an AC contactor and connected in series with a residual current circuit breaker, enabling precise control of the circuit and enhancing system safety and stability.

[0056] The AC contactor can be controlled by the controller 20 to achieve remote operation and automatic control of the electric heat tracing circuit 30. In some hazardous environments or large industrial sites, workers do not need to be on-site; they can operate the AC contactor to close and open, controlling the operation of the electric heat tracing circuit 30, improving work efficiency and ensuring personnel safety. For example, in the remote monitoring center of a petrochemical enterprise, operators can remotely control the AC contactors of each circuit according to production needs.

[0057] During the operation of an electric heat tracing system, the circuit may need to be frequently started and stopped based on parameters such as temperature. AC contactors can frequently connect and disconnect circuits, meeting this requirement, and have a long service life. Compared to manual switches, AC contactors are more suitable for this type of frequent operation, ensuring stable system operation and reducing equipment failures.

[0058] An AC contactor and a residual current circuit breaker (RCCB) are connected in series. The RCCB detects leakage faults and disconnects the circuit, while the AC contactor assists in disconnecting the circuit under normal control and fault conditions. When a leakage occurs, the RCCB quickly disconnects the circuit, and the AC contactor also disconnects, further ensuring the circuit is de-energized, enhancing system safety, and preventing safety accidents caused by leakage.

[0059] The following example illustrates that the electric heat tracing circuit 30 is equipped with ten circuits, and the explosion-proof control system includes the first residual current circuit breaker QF1, the second residual current circuit breaker QF2, the third residual current circuit breaker QF3, the fourth residual current circuit breaker QF4, the fifth residual current circuit breaker QF5, the sixth residual current circuit breaker QF6, the seventh residual current circuit breaker QF7, the eighth residual current circuit breaker QF8, the ninth residual current circuit breaker QF9, and the tenth residual current circuit breaker QF10. The automatic switches are designated as follows: first automatic switch K1, second automatic switch K2, third automatic switch K3, fourth automatic switch K4, fifth automatic switch K5, sixth automatic switch K6, seventh automatic switch K7, eighth automatic switch K8, ninth automatic switch K9, and tenth automatic switch K10; the AC contactors are designated as follows: first AC contactor KM1, second AC contactor KM2, third AC contactor KM3, fourth AC contactor KM4, fifth AC contactor KM5, sixth AC contactor KM6, seventh AC contactor KM7, eighth AC contactor KM8, ninth AC contactor KM9, and tenth AC contactor KM10; the signal lights are designated as follows: first signal light HG1, second signal light HG2, third signal light HG3, fourth signal light HG4, fifth signal light HG5, sixth signal light HG6, seventh signal light HG7, eighth signal light HG8, ninth signal light HG9, and tenth signal light HG10.

[0060] Each of the 30 electric heat tracing circuits has a corresponding residual current circuit breaker (RCCB), designated as RCCBs 1 through 10. If a leakage occurs in any circuit, the corresponding RCCB will quickly trip, cutting off the power to that circuit. This confines the fault to a single circuit, preventing disruption to other normal circuits. Each of the ten electric heat tracing circuits is also equipped with an automatic switch (designated as RCCB 1 through 10). When the temperature sensor detects that the circuit temperature exceeds a preset value, the controller will activate the corresponding automatic switch to open and stop heating; once the temperature returns to normal, the automatic switch will close again. This precise temperature control ensures that the temperature of the electric heat tracing circuit remains within a safe and reasonable range, preventing equipment damage or production accidents caused by abnormal temperatures.

[0061] The first through tenth AC contactors provide remote control and frequent operation capabilities for each electric heat tracing circuit. In large industrial projects, operators can remotely control the opening and closing of the AC contactors from the control room via a controller to achieve start-stop control of the electric heat tracing circuit. The AC contactors can frequently connect and disconnect circuits, adapting to the frequent start-stop operation mode of the electric heat tracing system according to production needs, ensuring the stability and reliability of system operation.

[0062] The first to tenth indicator lights correspond to ten electric heat tracing circuits. By observing the on / off status of these lights, operators can intuitively understand the operating status of each circuit. A lit indicator light means the circuit is working; an off indicator light means the circuit is stopped. This helps operators quickly determine the system's operating status, promptly detect abnormalities, and improve system monitorability and maintenance convenience. In complex industrial environments, operators can quickly determine which circuits are operating and which are malfunctioning by observing the indicator lights, allowing for timely and appropriate corrective action.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. An explosion-proof control system, characterized in that, The explosion-proof control system includes: multiple temperature sensors, each corresponding to an electric heat tracing circuit, used to detect the temperature of the electric heat tracing circuit; multiple automatic switches, each located within an electric heat tracing circuit, with each temperature sensor and automatic switch corresponding to one another; and a controller with a first terminal and a second terminal. The first terminal has multiple temperature interfaces, each connected to a temperature sensor. The second terminal has multiple control interfaces, each connected to an automatic switch. The controller disconnects the electric heat tracing circuit based on the automatic switches when the temperature of the electric heat tracing circuit exceeds a preset temperature.

2. The explosion-proof control system according to claim 1, characterized in that, The explosion-proof control system also includes a display screen connected to the controller. The display screen is used to display the parameters of the electric heat tracing circuit when the temperature exceeds the preset temperature.

3. The explosion-proof control system according to claim 1, characterized in that, The explosion-proof control system also includes a manual switch, and multiple manual switches are provided. The manual switches are respectively located in the electric heat tracing circuit, and one manual switch is connected in parallel with one automatic switch.

4. The explosion-proof control system according to claim 1, characterized in that, The explosion-proof control system also includes a communication terminal, which is connected to the controller and is used for network communication.

5. The explosion-proof control system according to claim 1, characterized in that, The explosion-proof control system also includes a fault circuit, which is connected in parallel with the electric heat tracing circuit. The fault circuit includes an alarm switch and an explosion-proof buzzer, which are connected in series. The controller is provided with a comprehensive fault terminal, which is connected to the alarm switch to control the on / off state of the alarm switch.

6. The explosion-proof control system according to any one of claims 1 to 5, characterized in that, The explosion-proof control system also includes several leakage circuit breakers, with one leakage circuit breaker corresponding to each of the electric heat tracing circuits.

7. The explosion-proof control system according to claim 6, characterized in that, The explosion-proof control system also includes several indicator lights, with one indicator light installed in each of the electric heat tracing circuits.

8. The explosion-proof control system according to claim 6, characterized in that, The explosion-proof control system also includes a main circuit breaker, which is located between the electric heat tracing circuit and the power supply.

9. The explosion-proof control system according to claim 8, characterized in that, The explosion-proof control system also includes a main indicator light, which is connected in series with the main circuit breaker.

10. The explosion-proof control system according to claim 6, characterized in that, The explosion-proof control system also includes several AC contactors, with one AC contactor installed in each of the electric heat tracing circuits, and the AC contactor and the leakage circuit breaker connected in series.

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