Intelligent constant temperature adjusting device based on DCS control

Abstract

The utility model relates to an intelligent constant temperature adjusting device based on DCS (Distributed Control System) control, which relates to the field of a self-contained control system and comprises a temperature detection module, a temperature reference module, a temperature comparison module, a low temperature control module and a heat tracing module, the temperature reference module is used for providing a temperature reference signal, and the temperature comparison module is connected with the temperature detection module and the temperature reference module to receive the temperature detection signal and the temperature reference signal and output a low-temperature comparison signal. The low-temperature control module is connected with the temperature comparison module to receive the low-temperature comparison signal and output a low-temperature control signal, and the heat tracing module is connected with the low-temperature control module to receive the low-temperature control signal and respond to the low-temperature control signal to control starting and stopping of the heat tracing device. The utility model has the effects of improving the convenience of the use of the electric heat tracing and automatically switching the heat tracing equipment.

Description

Technical Field

[0001] The utility model relates to the field of self - contained control systems, and particularly to an intelligent constant - temperature regulating device based on DCS control. Background Technique

[0002] The DCS control system, also known as the distributed control system or distributed computer control system, is a new - generation instrument control system based on microprocessors, adopting the design principle of decentralized control functions, centralized display and operation, and taking into account decentralized autonomy and comprehensive coordination.

[0003] In the prior art, the DCS control system is generally applied to unit combination instruments. Relying on the flexible configuration of various control and operation modules, the DCS control system can implement diversified control strategies to meet the instrument requirements in different situations. The readings of the instruments are easily affected by the ambient temperature. When the ambient temperature is too low, it is easy to cause measurement results to deviate or the instruments to malfunction due to the ambient temperature at the instrument measuring points, resulting in abnormal operation of the control system. Generally, electric tracing is used to supplement the heat of the instrument measuring points to reduce the deviation of measurement results or instrument malfunctions. When electric tracing needs to be started, an alarm is generally issued by the instrument to notify the on - site staff to switch it on or off in time.

[0004] The opening and closing of the electric tracing require the intervention of staff. When the staff do not timely discover the alarm issued by the instrument, it is easy to cause the situation of delayed start of the electric tracing, resulting in deviation of measurement results or instrument malfunctions. Content of the Utility Model

[0005] In order to improve the convenience of using electric tracing and be able to automatically switch on and off the tracing equipment, the utility model provides an intelligent constant - temperature regulating device based on DCS control.

[0006] The intelligent constant - temperature regulating device based on DCS control provided by the utility model adopts the following technical solutions:

[0007] An intelligent constant - temperature regulating device based on DCS control includes a temperature detection module, a temperature reference module, a temperature comparison module, a low - temperature control module, and a tracing module. The temperature detection module is used to detect the temperature physical quantity of the instrument measuring point and convert it into a temperature detection signal. The temperature reference module is used to provide a temperature reference signal. The temperature comparison module is connected to the temperature detection module and the temperature reference module to receive the temperature detection signal and the temperature reference signal and output a low - temperature comparison signal. The low - temperature control module is connected to the temperature comparison module to receive the low - temperature comparison signal and output a low - temperature control signal. The tracing module is connected to the low - temperature control module to receive the low - temperature control signal and respond to the low - temperature control signal to control the opening and closing of the tracing device;

[0008] When the temperature detection signal is less than the temperature reference signal, the temperature comparison module outputs a low-temperature comparison signal with a high level. The low-temperature control module receives the low-temperature comparison signal with a high level and outputs a low-temperature control signal with a high level. The tracing module receives the low-temperature control signal with a high level and controls the tracing device to start.

[0009] When the temperature detection signal is not less than the temperature reference signal, the temperature comparison module outputs a low-temperature comparison signal with a low level. The low-temperature control module receives the low-temperature comparison signal with a low level and outputs a low-temperature control signal with a low level. The tracing module receives the low-temperature control signal with a low level and controls the tracing device to turn off.

[0010] By adopting the above technical solution, the temperature of the instrument measuring point is detected by the temperature detection module, so that the tracing device is started to supplement heat when the temperature of the instrument measuring point is low, and when the temperature returns to normal, the tracing device is controlled to turn off, thereby automatically switching the tracing device and improving the convenience of using the electric tracing.

[0011] Optionally, it further includes a delay module and a high-temperature control module. The delay module is connected to the temperature comparison module to receive the low-temperature comparison signal and delay the output of the delay signal to the low-temperature control module. The temperature comparison module is connected to the temperature detection module and the temperature reference module to receive the temperature detection signal and the temperature reference signal and output a high-temperature comparison signal. The high-temperature control module is connected to the temperature comparison module to receive the high-temperature comparison signal and output a high-temperature control signal. The tracing module is connected to the low-temperature control module and the high-temperature control module to receive the low-temperature control signal and the high-temperature control signal and respond to the low-temperature control signal and the high-temperature control signal to control the opening and closing of the tracing device.

[0012] When the temperature detection signal is less than the temperature reference signal, the temperature comparison module outputs a low-temperature comparison signal with a high level and a high-temperature comparison signal with a low level. The delay module receives the low-temperature comparison signal with a high level and delays the output of a high-level delay signal to the low-temperature control device. The high-temperature control module receives the high-temperature comparison signal with a low level and outputs a high-temperature control signal with a low level.

[0013] When the temperature detection signal is not less than the temperature reference signal, the temperature comparison module outputs a low-temperature comparison signal with a low level and a high-temperature comparison signal with a high level. The delay module receives the low-temperature comparison signal with a low level and delays the output of a low-level delay signal to the low-temperature control device. The high-temperature control module receives the high-temperature comparison signal with a high level and outputs a high-temperature control signal with a high level.

[0014] When the high-temperature control module outputs a high-temperature control signal with a low level and the low-temperature control module outputs a low-temperature control signal with a high level, the tracing module receives the high-temperature control signal with a low level and the low-temperature control signal with a high level and controls the tracing device to start.

[0015] By adopting the above technical solution, when the temperature is too low, the electric tracing is started with a delay, thereby reducing the situation that the electric tracing continuously starts due to the slow increase in the temperature of the instrument measurement point after the electric tracing is started, and the tracing device is controlled to be turned off when the temperature is relatively high through the high-temperature control module, thereby reducing the situation that the temperature of the instrument measurement point is too high due to the long-term start of the electric tracing.

[0016] Optionally, it further includes a high-temperature prompt module, and the high-temperature prompt module is connected to the high-temperature control module to receive the high-temperature control signal and respond to the high-temperature control signal to control the opening and closing of the high-temperature prompt lamp;

[0017] When the high-temperature control module outputs a high-level high-temperature control signal, the high-temperature prompt module receives the high-level high-temperature control signal and controls the high-temperature prompt lamp to start;

[0018] When the high-temperature control module outputs a low-level high-temperature control signal, the high-temperature prompt module receives the low-level high-temperature control signal and controls the high-temperature prompt lamp to turn off.

[0019] By adopting the above technical solution, when the temperature is relatively high, the high-temperature prompt module prompts the staff about the temperature condition of the instrument measurement point and the working condition of the tracing device, thereby facilitating the staff to judge the operation status of the DCS control system.

[0020] Optionally, the temperature detection module includes a first detection unit, a second detection unit and an averaging unit. The first detection unit is used to detect the temperature physical quantity of the first detection point of the instrument and convert it into a first detection signal. The second detection unit is used to detect the temperature physical quantity of the second detection point of the instrument and convert it into a second detection signal. The averaging unit is connected to the first detection unit and the second detection unit to receive the first detection signal and the second detection signal and output a temperature detection signal.

[0021] By adopting the above technical solution, the averaging unit calculates the average value of the temperatures of the first measurement point and the second measurement point of the instrument, and thereby uses the average value as the actual temperature to control the tracing device, thereby improving the accuracy of temperature detection and further improving the stability of the use of the tracing equipment.

[0022] Optionally, it further includes a difference module, a difference reference module, a difference comparison module, a warning control module, and a warning module. The difference module is connected to the first detection unit and the second detection unit to receive the first detection signal and the second detection signal and output a temperature difference signal. The difference reference module is used to provide a difference reference signal. The difference comparison module is connected to the difference module and the difference reference module to receive the temperature difference signal and the difference reference signal and output a difference comparison signal. The warning control module is connected to the difference comparison module to receive the difference comparison signal and output a warning control signal. The warning module is connected to the warning control module to receive the warning control signal and respond to the warning control signal to control the opening and closing of the annunciator;

[0023] When the temperature difference signal is greater than the difference reference signal, the difference comparison module outputs a high-level difference comparison signal. The warning control module receives the high-level difference comparison signal and outputs a high-level warning control signal. The warning module receives the high-level warning control signal and controls the annunciator to start;

[0024] When the temperature difference signal is not greater than the difference reference signal, the difference comparison module outputs a low-level difference comparison signal. The warning control module receives the low-level difference comparison signal and outputs a low-level warning control signal. The warning module receives the low-level warning control signal and controls the annunciator to close.

[0025] By adopting the above technical solution, the difference between the temperatures of the first measurement point and the second measurement point of the instrument is calculated by the difference module, so as to issue a warning through the annunciator when the difference is too large, thereby reducing the situation where the distance between the first measurement point and the second measurement point is too far.

[0026] Optionally, it further includes an operating temperature module, an operating reference module, an operating comparison module, an operating logic module, and a warning logic module. The operating temperature module is used to detect the temperature physical quantity of the tracing equipment and convert it into an operating temperature signal. The operating reference module is used to provide an operating reference signal. The operating comparison module is connected to the operating temperature module and the operating reference module to receive the operating temperature signal and the operating reference signal and output an operating comparison signal. The operating logic module is connected to the delay module to receive the operating comparison signal and the delay signal and output an operating logic signal. The warning logic module is connected to the operating logic module and the difference comparison module to receive the operating logic signal and the difference comparison signal and output a warning logic signal to the warning control module;

[0027] When the operating temperature signal is lower than the operating reference signal, the operating comparison module outputs a high-level operating comparison signal. When the operating temperature signal is not lower than the operating reference signal, the operating comparison module outputs a low-level operating comparison signal;

[0028] When the working comparison module outputs a high-level working comparison signal and the delay module outputs a high-level delay signal, the working logic module outputs a high-level working logic signal; otherwise, the working logic module outputs a low-level working logic signal.

[0029] When the working logic module outputs a high-level working logic signal and / or the difference comparison module outputs a high-level difference comparison signal, the warning logic module outputs a high-level warning logic signal to the warning control module; otherwise, the warning logic module outputs a low-level warning logic signal to the warning control module.

[0030] By adopting the above technical solution, when the tracing device is started, the working temperature module detects the temperature of the tracing equipment, thereby judging the working state of the tracing equipment according to the temperature of the tracing equipment, and further, when the tracing equipment fails and cannot work properly, the staff is prompted by the optical annunciator to repair and debug the tracing equipment.

[0031] Optionally, the difference module includes a first positive resistance unit, a second positive resistance unit, a negative resistance unit, a feedback resistance unit and a comparison unit. The comparison unit is used to output a temperature difference signal, and the first positive resistance unit, the second positive resistance unit, the negative resistance unit and the feedback resistance unit are used to adjust the magnitude of the temperature difference signal.

[0032] By adopting the above technical solution, the amplification factor of the output temperature difference signal is adjusted by adjusting the resistance values of the first positive resistance unit, the second positive resistance unit, the negative resistance unit and the feedback resistance unit, thereby improving the convenience of use of the difference module.

[0033] Optionally, it further includes a low-temperature prompt module. The low-temperature prompt module is connected to the low-temperature control module to receive a low-temperature control signal and respond to the low-temperature control signal to control the opening and closing of the low-temperature prompt lamp.

[0034] When the low-temperature control module outputs a high-level low-temperature control signal, the low-temperature prompt module receives the high-level low-temperature control signal and controls the low-temperature prompt lamp to start.

[0035] When the low-temperature control module outputs a low-level low-temperature control signal, the low-temperature prompt module receives the low-level low-temperature control signal and controls the low-temperature prompt lamp to turn off.

[0036] By adopting the above technical solution, when the temperature is relatively low, the low-temperature prompt module prompts the staff about the temperature condition of the instrument measuring point and the working condition of the tracing device, thereby facilitating the staff to judge the operation status of the DCS control system.

[0037] Optionally, it further includes a manual switching module and a tracing logic module. The manual module is used to output a manual switching signal. The tracing logic module is connected to the manual switching module and the temperature comparison module to receive the manual switching signal and the low-temperature comparison signal and output a tracing logic signal.

[0038] When the manual switching module outputs a high-level manual switching signal and / or the temperature comparison module outputs a high-level low-temperature comparison signal, the tracing logic module outputs a high-level tracing logic signal to the delay module. Otherwise, the tracing logic module outputs a low-level tracing logic signal to the delay module.

[0039] By adopting the above technical solution, when the staff determines that the tracing device needs to be started on site, the tracing device is manually started through the manual switching module, thereby reducing the situation where the tracing equipment cannot be started when the DCS control system fails.

[0040] In summary, the utility model includes at least one of the following beneficial technical effects:

[0041] 1. The temperature of the instrument measuring point is detected by the temperature detection module, so that the tracing device is started to supplement heat when the temperature of the instrument measuring point is low, and when the temperature returns to normal, the tracing device is controlled to turn off, thereby automatically switching the tracing device and improving the convenience of using the electric tracing.

[0042] 2. When the temperature is too low, the electric tracing is started with a delay, thereby reducing the situation where the electric tracing continues to start due to the slow increase in the temperature of the instrument measuring point after the electric tracing is started, and the tracing device is controlled to turn off when the temperature is high through the high-temperature control module, thereby reducing the situation where the temperature of the instrument measuring point is too high due to the long-term start of the electric tracing.

[0043] 3. The average value of the temperatures of the first measuring point and the second measuring point of the instrument is calculated by the averaging unit, so that the average value is used as the actual temperature to control the tracing device, thereby improving the accuracy of temperature detection and further improving the stability of using the tracing equipment. Description of the Drawings

[0044] Figure 1 It is a circuit schematic diagram of an intelligent constant temperature regulation device based on DCS control.

[0045] The names of the parts referred to by each numerical label in the above drawings are as follows: 1. Temperature detection module; 2. Temperature reference module; 3. Temperature comparison module; 4. Low-temperature control module; 5. Heat tracing module; 6. Delay module; 7. High-temperature control module; 8. High-temperature prompt module; 9. First detection unit; 10. Second detection unit; 11. Mean value unit; 12. Difference module; 13. Difference reference module; 14. Difference comparison module; 15. Warning control module; 16. Warning module; 17. Operating temperature module; 18. Operating reference module; 19. Operating comparison module; 20. Operating logic module; 21. Warning logic module; 22. First positive resistance unit; 23. Second positive resistance unit; 24. Negative resistance unit; 25. Feedback resistance unit; 26. Comparison unit; 27. Low-temperature prompt module; 28. Manual switching module; 29. Heat tracing logic module. Specific embodiments

[0046] The present invention will be further described in detail below with reference to the drawings and embodiments.

[0047] An embodiment of the present invention discloses an intelligent constant temperature regulation device based on DCS control. Referring to Figure 1 , an intelligent constant temperature regulation device based on DCS control includes a temperature detection module 1, a temperature reference module 2, a temperature comparison module 3, a manual switching module 28, a heat tracing logic module 29, a delay module 6, a low-temperature control module 4, a low-temperature prompt module 27, a high-temperature control module 7, a high-temperature prompt module 8, and a heat tracing module 5. The temperature detection module 1 is used to detect the external temperature physical quantity and convert it into a temperature detection signal. The temperature reference module 2 is used to provide a temperature reference signal. The temperature comparison module 3 is used to compare the temperature detection signal and the temperature reference signal and output a low-temperature comparison signal and a high-temperature comparison signal. The delay module 6 is used to receive the low-temperature comparison signal and delay the output of a delay signal. The manual switching module 28 is used to output a manual switching signal. The heat tracing logic module 29 is used to receive the delay signal and the manual switching signal and output a heat tracing logic signal. The low-temperature control module 4 is used to receive the heat tracing logic signal and output a low-temperature control signal. The low-temperature prompt module 27 is used to receive the low-temperature control signal and respond to the low-temperature control signal to control the opening and closing of a low-temperature prompt lamp. The high-temperature control module 7 is used to receive the high-temperature comparison signal and output a high-temperature control signal. The high-temperature prompt module 8 is used to receive the high-temperature control signal and respond to the high-temperature control signal to control the opening and closing of a high-temperature prompt lamp. The heat tracing module 5 is used to receive the low-temperature control signal and the high-temperature control signal and respond to the low-temperature control signal and the high-temperature control signal to control the opening and closing of a heat tracing device.

[0048] The temperature detection module 1 includes a first detection unit 9, a second detection unit 10, and an averaging unit 11. The first detection unit 9 is used to detect the temperature physical quantity at the first measurement point of the instrument and convert it into a first detection signal. The second detection unit 10 is used to detect the temperature physical quantity at the second measurement point of the instrument and convert it into a second detection signal. The averaging unit 11 is used to receive the first detection signal and the second detection signal and output the average value of the first detection signal and the second detection signal as the temperature detection signal.

[0049] The first detection unit 9 includes a thermistor RT1 and a resistor R1. The thermistor RT1 is a negative temperature coefficient thermistor. The second detection unit 10 includes a thermistor RT2 and a resistor R2. The thermistor RT2 is a negative temperature coefficient thermistor. The averaging unit 11 includes a chip U1, and the chip U1 uses an STM32 chip. In the STM32 microcontroller, the sample values can be automatically accumulated after each conversion by configuring the ADC interrupt, and the average value can be calculated after reaching the predetermined number of sampling times.

[0050] The temperature reference module 2 includes a resistor R3, a resistor R4, and a resistor R5. The temperature comparison module 3 includes a chip U2, and the chip U2 uses a comparator chip. The first input terminal of the chip U2 is used to input the signal to be compared. The second input terminal of the chip U2 is used to input the lower limit value of the interval. When there is no input at the second input terminal of the chip U2, the default lower limit value of the interval is 0. The third input terminal of the chip U2 is used to input the upper limit value of the interval. When there is no input at the third input terminal of the chip U2, the default upper limit value of the interval is 0. The chip U2 can determine whether the signal to be compared input at the first input terminal falls within the range between the lower limit value and the upper limit value of the interval. When the signal to be compared falls within the range between the lower limit value and the upper limit value of the interval, the first output terminal of the chip U2 outputs a low level, and the second output terminal of the chip U2 outputs a high level. When the signal to be compared does not fall within the range between the lower limit value and the upper limit value of the interval, the first output terminal of the chip U2 outputs a high level, and the second output terminal of the chip U2 outputs a low level. The chip U2 can be obtained by programming with an STM32 chip.

[0051] The manual switching module 28 includes a chip U3, and the chip U3 can use a switch IC chip of model FH153C8. The tracing logic module 29 includes a chip U4, and the chip U4 uses an OR gate integrated circuit chip. The delay module 6 includes a chip U5, and the chip U5 uses a delay chip of model ECH211030 - 1422 - BED7. Generally, the delay time is set to 30 seconds.

[0052] The low-temperature control module 4 includes a triode Q1 and a relay KM1. The triode Q1 is an NPN-type triode with the model number 9013. The low-temperature prompt module 27 includes a light-emitting diode LED1. The high-temperature control module 7 includes a triode Q2 and a relay KM2. The triode Q2 is an NPN-type triode with the model number 9013. The high-temperature prompt module 8 includes a light-emitting diode LED2. The tracing heating module 5 includes a normally open contact KM1-1 of the relay, a normally closed contact KM2-1 of the relay, and a tracing heating device.

[0053] One end of the thermistor RT1 is connected to the power supply VCC. The other end of the thermistor RT1 is connected to one end of the resistor R1 and then connected to an input terminal of the chip U1. The other end of the resistor R1 is connected to the ground GND. One end of the thermistor RT2 is connected to the power supply VCC. The other end of the thermistor RT2 is connected to one end of the resistor R2 and then connected to an input terminal of the chip U1. The other end of the resistor R2 is connected to the ground GND. The output terminal of the chip U1 is connected to the first input terminal of the chip U2. One end of the resistor R3 is connected to the power supply VCC. The other end of the resistor R3 is connected to the resistor R4 and then connected to the resistor R5. The other end of the resistor R4 is connected to the ground GND. The other end of the resistor R5 is connected to the third input terminal of the chip U2. The second input terminal of the chip U2 is left vacant. The second output terminal of the chip U2 is connected to an input terminal of the chip U4. The output terminal of the chip U3 is connected to the other input terminal of the chip U4. The output terminal of the chip U4 is connected to the input terminal of the chip U5. The output terminal of the chip U5 is connected to the base of the triode Q1. The emitter of the triode Q1 is connected to the ground GND. The collector of the triode Q1 is connected to the output terminal of the relay KM1. The input terminal of the relay KM1 is connected to the cathode of the light-emitting diode LED1. The anode of the light-emitting diode LED1 is connected to the power supply VCC. The first output terminal of the chip U2 is connected to the base of the triode Q2. The emitter of the triode Q2 is connected to the ground GND. The collector of the triode Q2 is connected to the output terminal of the relay KM2. The input terminal of the relay KM2 is connected to the cathode of the light-emitting diode LED2. The anode of the light-emitting diode LED2 is connected to the power supply VCC. One end of the normally closed contact KM2-1 of the relay is connected to the power supply VCC. The other end of the normally closed contact KM2-1 of the relay is connected to one end of the normally open contact KM1-1 of the relay. The other end of the normally open contact KM1-1 of the relay is connected to the input terminal of the tracing heating device. The output terminal of the tracing heating device is connected to the ground GND.

[0054] It further includes a difference module 12, a difference reference module 13, a difference comparison module 14, an operating temperature module 17, an operating reference module 18, an operating comparison module 19, an operating logic module 20, a warning logic module 21, a warning control module 15, and a warning module 16. The difference module 12 is used to subtract the second detection signal from the first detection signal to obtain a temperature difference signal. The difference reference module 13 is used to provide a difference reference signal. The difference comparison module 14 is used to compare the temperature difference signal and the difference reference signal and output a difference comparison signal. The operating temperature module 17 is used to detect the physical quantity of the temperature of the tracing device and convert it into an operating temperature signal. The operating reference module 18 is used to provide an operating reference signal. The operating comparison module 19 is used to compare the operating temperature signal and the operating reference signal and output an operating comparison signal. The operating logic module 20 is used to receive the operating comparison signal and the delay signal and output an operating logic signal. The warning logic module 21 is used to receive the difference comparison signal and the operating logic signal and output a warning logic signal. The warning control module 15 is used to receive the warning logic signal and output a warning control signal. The warning module 16 is used to receive the warning control signal and respond to the warning control signal to control the opening and closing of the annunciator light.

[0055] The difference module 12 includes a first positive resistance unit 22, a second positive resistance unit 23, a negative resistance unit 24, a feedback resistance unit 25, and a comparison unit 26. The comparison unit 26 is used to output a temperature difference signal. The first positive resistance unit 22, the second positive resistance unit 23, the negative resistance unit 24, and the feedback resistance unit 25 are used to adjust the magnitude of the temperature difference signal. The feedback resistance unit 25 and the comparison unit 26 form a negative feedback loop. The first positive resistance unit 22 includes a resistor R6. The second positive resistance unit 23 includes a resistor R7. The negative resistance unit 24 includes a resistor R8. The feedback resistance unit 25 includes a resistor R9. The comparison unit 26 includes a comparator N1. The calculation formula of the temperature difference signal is V o That is the temperature difference signal to be obtained. R6 is the resistance value of the first positive resistance unit 22. R7 is the resistance value of the second positive resistance unit 23. R8 is the resistance value of the negative resistance unit 24. R9 is the resistance value of the feedback resistance unit 25. V i1 is the first detection signal. V i2 is the second detection signal. Generally, the resistance values of the first positive resistance unit 22, the second positive resistance unit 23, the negative resistance unit 24, and the feedback resistance unit 25 are adjusted so that R 7 / R6 = R 9 / R8, so that the formula is evolved into Furthermore, the amplification factor of the temperature difference signal is adjusted by adjusting the ratio of the resistance values of the first positive resistance unit 22 and the second positive resistance unit 23.

[0056] The difference reference module 13 includes a resistor R10, a resistor R11, and a resistor 12. The difference comparison module 14 includes a comparator N2. The operating temperature module 17 includes a thermistor RT3 and a resistor R13. The thermistor RT3 is a negative temperature coefficient thermistor. The operating reference module 18 includes a resistor R14, a resistor R15, and a resistor 16. The operating comparison module 19 includes a comparator N3. The operating logic module 20 includes a chip U6, and the chip U6 is an AND gate integrated circuit chip.

[0057] The warning logic module 21 includes a chip U7, and the chip U7 is an OR gate integrated circuit chip. The warning control module 15 includes a triode Q3 and a relay KM3. The triode Q3 is an NPN type triode with the model number 9013. The warning module 16 includes a normally open contact KM3-1 of the relay and a pilot light.

[0058] The other end of the thermistor RT1 is connected to one end of the resistor R1 and then to one end of the resistor R6. The other end of the resistor R6 is connected to one end of the resistor R7 and then to the positive input terminal of the comparator N1. The other end of the resistor R7 is connected to the ground GND. The other end of the thermistor RT2 is connected to one end of the resistor R2 and then to one end of the resistor R8. The other end of the resistor R8 is connected to one end of the resistor R9 and then to the negative input terminal of the comparator N1. The other end of the resistor R9 is connected to the output terminal of the comparator N1 and then to the positive input terminal of the comparator N2. One end of the resistor R10 is connected to the power supply VCC. The other end of the resistor R10 is connected to one end of the resistor R11 and then to one end of the resistor R12. The other end of the resistor R11 is connected to the ground GND. The other end of the resistor R12 is connected to the negative input terminal of the comparator N2. The output terminal of the comparator N2 is connected to an input terminal of the chip U7. One end of the thermistor RT3 is connected to the power supply VCC. The other end of the thermistor RT3 is connected to one end of the resistor R13 and then to the negative input terminal of the comparator N3. The other end of the resistor R13 is connected to the ground GND. One end of the resistor R14 is connected to the power supply VCC. The other end of the resistor R14 is connected to one end of the resistor R15 and then to one end of the resistor R16. The other end of the resistor R15 is connected to the ground GND. The other end of the resistor R16 is connected to the positive input terminal of the comparator N3. The output terminal of the comparator N3 is connected to an input terminal of the chip U6. The output terminal of the chip U5 is connected to the base of the triode Q1 and then to another input terminal of the chip U6. The output terminal of the chip U6 is connected to the other input terminal of the chip U7. The output terminal of the chip U7 is connected to the base of the triode Q3. The emitter of the triode Q3 is connected to the ground GND. The collector of the triode Q3 is connected to the output terminal of the relay KM3. The input terminal of the relay KM3 is connected to the power supply VCC. One end of the normally open contact KM3-1 of the relay is connected to the power supply VCC. The other end of the normally open contact KM3-1 of the relay is connected to the input terminal of the optical sign. The output terminal of the optical sign is connected to the ground GND.

[0059] The implementation principle of an intelligent constant temperature regulation device based on DCS control in an embodiment of the present invention is as follows:

[0060] When the temperature detection signal is less than the temperature reference signal, the temperature comparison module 3 outputs a high-level low-temperature comparison signal and a low-level high-temperature comparison signal. The delay module 6 receives the high-level low-temperature comparison signal and delays the output of a high-level delay signal. The low-temperature control module 4 receives the high-level delay signal and outputs a high-level low-temperature control signal. The high-temperature control module 7 receives the low-level high-temperature comparison signal and outputs a low-level high-temperature control signal;

[0061] When the temperature detection signal is not less than the temperature reference signal, the temperature comparison module 3 outputs a low-level low-temperature comparison signal and a high-level high-temperature comparison signal. The delay module 6 receives the low-level low-temperature comparison signal and delays it to output a low-level delay signal. The low-temperature control module 4 receives the low-level delay signal and outputs a low-level low-temperature control signal. The high-temperature control module 7 receives the high-level high-temperature comparison signal and outputs a high-level high-temperature control signal;

[0062] When the high-temperature control module 7 outputs a low-level high-temperature control signal and the low-temperature control module 4 outputs a high-level low-temperature control signal, the tracing module 5 receives the low-level high-temperature control signal and the high-level low-temperature control signal and controls the tracing device to start, otherwise the tracing device is turned off.

[0063] The above are only the preferred embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. An intelligent constant temperature regulating device based on DCS control, characterized in that: The invention comprises a temperature detection module (1), a temperature reference module (2), a temperature comparison module (3), a low temperature control module (4) and a heating module (5), wherein the temperature detection module (1) is used to detect the temperature physical quantity of the instrument measurement point and convert it into a temperature detection signal, the temperature reference module (2) is used to provide a temperature reference signal, the temperature comparison module (3) is connected to the temperature detection module (1) and the temperature reference module (2) to receive the temperature detection signal and the temperature reference signal and output a low temperature comparison signal, the low temperature control module (4) is connected to the temperature comparison module (3) to receive the low temperature comparison signal and output a low temperature control signal, and the heating module (5) is connected to the low temperature control module (4) to receive the low temperature control signal and respond to the low temperature control signal to control the opening and closing of the heating device; When the temperature detection signal is less than the temperature reference signal, the temperature comparison module (3) outputs a high-level low-temperature comparison signal, the low-temperature control module (4) receives the high-level low-temperature comparison signal and outputs a high-level low-temperature control signal, and the heating module (5) receives the high-level low-temperature control signal and controls the heating device to start; When the temperature detection signal is not less than the temperature reference signal, the temperature comparison module (3) outputs a low-level low-temperature comparison signal, the low-temperature control module (4) receives the low-level low-temperature comparison signal and outputs a low-level low-temperature control signal, and the heating module (5) receives the low-level low-temperature control signal and controls the heating device to be turned off.

2. According to claim 1, an intelligent constant temperature regulating device based on DCS control is characterized in that: It also includes a delay module (6) and a high temperature control module (7), wherein the delay module (6) is connected to the temperature comparison module (3) to receive a low temperature comparison signal and delay output of the delay signal to the low temperature control module (4), the temperature comparison module (3) is connected to the temperature detection module (1) and the temperature reference module (2) to receive a temperature detection signal and a temperature reference signal and output a high temperature comparison signal, the high temperature control module (7) is connected to the temperature comparison module (3) to receive a high temperature comparison signal and output a high temperature control signal, and the heating module (5) is connected to the low temperature control module (4) and the high temperature control module (7) to receive a low temperature control signal and a high temperature control signal and respond to the low temperature control signal and the high temperature control signal to control the opening and closing of the heating device; When the temperature detection signal is less than the temperature reference signal, the temperature comparison module (3) outputs a high-level low-temperature comparison signal and a low-level high-temperature comparison signal, the delay module (6) receives the high-level low-temperature comparison signal and delays the output of the high-level delay signal to the low-temperature control device, and the high-temperature control module (7) receives the low-level high-temperature comparison signal and outputs a low-level high-temperature control signal; When the temperature detection signal is not less than the temperature reference signal, the temperature comparison module (3) outputs a low-level low-temperature comparison signal and a high-level high-temperature comparison signal, the delay module (6) receives the low-level low-temperature comparison signal and delays the output of the low-level delay signal to the low-temperature control device, and the high-temperature control module (7) receives the high-level high-temperature comparison signal and outputs a high-level high-temperature control signal; When the high temperature control module (7) outputs a low level high temperature control signal and the low temperature control module (4) outputs a high level low temperature control signal, the heating module (5) receives the low level high temperature control signal and the high level low temperature control signal and controls the heating device to start.

3. According to claim 2, the intelligent constant temperature regulating device based on DCS control is characterized in that: It also includes a high temperature prompt module (8), which is connected to the high temperature control module (7) to receive a high temperature control signal and respond to the high temperature control signal to control the on and off of the high temperature prompt light; When the high temperature control module (7) outputs a high-level high temperature control signal, the high temperature prompt module (8) receives the high-level high temperature control signal and controls the high temperature prompt light to start; When the high temperature control module (7) outputs a low-level high temperature control signal, the high temperature prompt module (8) receives the low-level high temperature control signal and controls the high temperature prompt light to turn off.

4. The intelligent constant temperature regulating device based on DCS control according to claim 2 is characterized in that: The temperature detection module (1) comprises a first detection unit (9), a second detection unit (10) and an averaging unit (11); the first detection unit (9) is used to detect the temperature physical quantity of a first detection point of the instrument and convert it into a first detection signal; the second detection unit (10) is used to detect the temperature physical quantity of a second detection point of the instrument and convert it into a second detection signal; the averaging unit (11) is connected to the first detection unit (9) and the second detection unit (10) to receive the first detection signal and the second detection signal and output the temperature detection signal.

5. The intelligent constant temperature regulating device based on DCS control according to claim 4 is characterized in that: The system further comprises a difference module (12), a difference reference module (13), a difference comparison module (14), a warning control module (15) and a warning module (16); the difference module (12) is connected to the first detection unit (9) and the second detection unit (10) to receive the first detection signal and the second detection signal and output a temperature difference signal; the difference reference module (13) is used to provide a difference reference signal; the difference comparison module (14) is connected to the difference module (12) and the difference reference module (13) to receive the temperature difference signal and the difference reference signal and output a difference comparison signal; the warning control module (15) is connected to the difference comparison module (14) to receive the difference comparison signal and output a warning control signal; and the warning module (16) is connected to the warning control module (15) to receive the warning control signal and respond to the warning control signal to control the opening and closing of the light-emitting sign; When the temperature difference signal is greater than the difference reference signal, the difference comparison module (14) outputs a high-level difference comparison signal, the warning control module (15) receives the high-level difference comparison signal and outputs a high-level warning control signal, and the warning module (16) receives the high-level warning control signal and controls the light-emitting sign to start; When the temperature difference signal is not greater than the difference reference signal, the difference comparison module (14) outputs a low-level difference comparison signal, the warning control module (15) receives the low-level difference comparison signal and outputs a low-level warning control signal, and the warning module (16) receives the low-level warning control signal and controls the light-emitting sign to be turned off.

6. The intelligent constant temperature regulating device based on DCS control according to claim 5 is characterized in that: The system further comprises a working temperature module (17), a working reference module (18), a working comparison module (19), a working logic module (20) and a warning logic module (21), wherein the working temperature module (17) is used to detect the temperature physical quantity of the heating device and convert it into a working temperature signal, the working reference module (18) is used to provide a working reference signal, the working comparison module (19) is connected to the working temperature module (17) and the working reference module (18) to receive the working temperature signal and the working reference signal and output a working comparison signal, the working logic module (20) is connected to the delay module (6) to receive the working comparison signal and the delay signal and output a working logic signal, and the warning logic module (21) is connected to the working logic module (20) and the difference comparison module (14) to receive the working logic signal and the difference comparison signal and output a warning logic signal to the warning control module (15); When the working temperature signal is lower than the working reference signal, the working comparison module (19) outputs a high-level working comparison signal; when the working temperature signal is not lower than the working reference signal, the working comparison module (19) outputs a low-level working comparison signal; When the working comparison module (19) outputs a high-level working comparison signal and the delay module (6) outputs a high-level delay signal, the working logic module (20) outputs a high-level working logic signal; otherwise, the working logic module (20) outputs a low-level working logic signal; When the working logic module (20) outputs a high-level working logic signal and / or the difference comparison module (14) outputs a high-level difference comparison signal, the warning logic module (21) outputs a high-level warning logic signal to the warning control module (15); otherwise, the warning logic module (21) outputs a low-level warning logic signal to the warning control module (15).

7. The intelligent constant temperature regulating device based on DCS control according to claim 5 is characterized in that: The difference module (12) comprises a first positive electrode resistance unit (22), a second positive electrode resistance unit (23), a negative electrode resistance unit (24), a feedback resistance unit (25) and a comparison unit (26); the comparison unit (26) is used to output a temperature difference signal; and the first positive electrode resistance unit (22), the second positive electrode resistance unit (23), the negative electrode resistance unit (24) and the feedback resistance unit (25) are used to adjust the magnitude of the temperature difference signal.

8. The intelligent constant temperature regulating device based on DCS control according to claim 1 is characterized in that: It also includes a low temperature prompt module (27), which is connected to the low temperature control module (4) to receive a low temperature control signal and to control the on and off of a low temperature prompt light in response to the low temperature control signal; When the low temperature control module (4) outputs a high-level low temperature control signal, the low temperature prompt module (27) receives the high-level low temperature control signal and controls the low temperature prompt light to start; When the low-temperature control module (4) outputs a low-level low-temperature control signal, the low-temperature prompt module (27) receives the low-level low-temperature control signal and controls the low-temperature prompt light to turn off.

9. The intelligent constant temperature regulating device based on DCS control according to claim 1, characterized in that: It also includes a manual switching module (28) and a heating logic module (29), wherein the manual switching module is used to output a manual switching signal, and the heating logic module (29) is connected to the manual switching module (28) and the temperature comparison module (3) to receive the manual switching signal and the low temperature comparison signal and output the heating logic signal; When the manual switching module (28) outputs a high-level manual switching signal and / or the temperature comparison module (3) outputs a high-level low-temperature comparison signal, the heating logic module (29) outputs a high-level heating logic signal to the delay module (6); otherwise, the heating logic module (29) outputs a low-level heating logic signal to the delay module (6).

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