Control system for preventing false triggering and interlocking of temperature detector
By combining components such as DCS safety barriers and ROC rate protection modules, abnormal temperature measurement points are automatically switched to maintenance bypass, solving the problem of false triggering and interlocking caused by loose wiring in temperature detection equipment and reducing production costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-10
- Publication Date
- 2026-03-13
AI Technical Summary
In existing technologies, temperature detection equipment may experience fluctuations in measurement readings due to loose wiring, which could erroneously trigger interlocks, causing equipment shutdowns and increasing production costs.
The system employs a combination of DCS safety barriers, DCS control system, ROC rate protection function module, RS trigger, maintenance bypass, reset button and electrical motor control cabinet. It detects temperature changes through DCS control system, automatically switches abnormal temperature measuring points to maintenance bypass, and manually activates it after normal operation is restored.
This effectively avoids equipment shutdowns caused by temperature measurement point display distortion, saving on equipment start-up and shutdown costs.
Smart Images
Figure CN223993054U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of temperature monitoring and control technology, and in particular to a control system for preventing the thermometer from erroneously triggering interlocks. Background Technology
[0002] In the industrial production field, temperature detection equipment installed on the equipment body in the factory can monitor the temperature and interlock the equipment to ensure the safe operation of the equipment system. Due to factors such as vibration during equipment operation in the factory, the wiring of temperature detection equipment may become loose, causing fluctuations in temperature measurement values. False readings may affect the judgment of process operators, and temperature measurement point distortion may trigger interlocks erroneously, causing the shutdown of a single piece of equipment or even the entire unit, causing delays and failures in production. At the same time, the start-up and shutdown process seriously increases unnecessary production and operation costs. Utility Model Content
[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a control system to prevent temperature sensors from erroneously triggering interlocks, which can effectively avoid equipment shutdowns caused by temperature measurement point display distortion, thus saving equipment start-up and shutdown costs.
[0004] This application provides a control system to prevent temperature sensors from erroneously triggering interlocks, including: a DCS safety barrier, a DCS control system, an ROC rate protection function module, an RS trigger, a maintenance bypass, a reset button, an electrical motor control cabinet, and a temperature detector installed on the field equipment body;
[0005] The input terminal of the DCS safety barrier is connected to the output terminal of the temperature detector, the output terminal of the DCS safety barrier is connected to the input terminal of the DCS control system, the output terminal of the DCS control system is connected to the input terminal of the electrical motor control cabinet and the input terminal of the RS trigger, respectively, the first output terminal of the RS trigger is connected to the maintenance bypass through the ROC rate protection function module, and the second output terminal of the RS trigger is connected to the reset button.
[0006] According to some embodiments of this application, the control system for preventing the temperature sensor from being falsely triggered by the interlock also includes a DCS relay, wherein the input terminal of the DCS relay is connected to the output terminal of the DCS control system, and the output terminal of the DCS relay is connected to the input terminal of the electrical motor control cabinet.
[0007] According to some embodiments of this application, the control system for preventing the thermometer from erroneously triggering the interlock further includes an alarm device, and the DCS control system is connected to the alarm device.
[0008] According to some embodiments of this application, the RS flip-flop is provided with an R input pin and an S input pin. The RS flip-flop is connected to the ROC rate protection function module through the S input pin, and the RS flip-flop is connected to the reset button through the R input pin.
[0009] According to some embodiments of this application, the control system for preventing the temperature sensor from erroneously triggering the interlock further includes a NAND gate logic circuit. The output terminal of the DCS control system is connected to the input terminal of the electrical motor control cabinet through the AND gate of the NAND gate logic circuit. The output terminal of the DCS control system is also connected to the input terminal of the RS flip-flop through the NOT gate of the NAND gate logic circuit.
[0010] In this application, a temperature detector is used to monitor the temperature of field equipment in real time and transmit the obtained temperature detection signal to the DCS control system through a DCS safety barrier. The DCS control system receives the temperature detection signal and determines whether the temperature change value of the corresponding temperature detector exceeds a preset temperature change threshold within a preset interval. When the DCS control system detects that the temperature change value of the temperature detector exceeds the preset temperature change threshold within a preset interval, the DCS control system outputs an ON switch signal to the S input pin of the RS trigger. The RS trigger controls the ROC rate protection function module to automatically switch the temperature measurement point interlock of the temperature detector to the maintenance bypass, preventing equipment interlocking caused by abnormal measurement point display. Maintenance personnel inspect and repair the temperature detector. After confirming that it has returned to normal, they manually press the reset button to reactivate the temperature detector. This application, through this setting, can automatically switch the abnormal temperature measurement point interlock to the maintenance bypass via the trigger output, preventing equipment interlocking caused by abnormal measurement point display. This effectively avoids equipment shutdowns caused by temperature measurement point display distortion, saving equipment start-up and shutdown costs.
[0011] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description
[0012] Additional aspects and advantages of this application will become apparent and readily understood in conjunction with the following description of the embodiments, in which:
[0013] Figure 1 A schematic diagram of the connection relationship of a control system for preventing accidental triggering of the interlock by the temperature sensor, provided for an embodiment of this application. Detailed Implementation
[0014] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.
[0015] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0016] In the description of this application, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.
[0017] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.
[0018] In the industrial production field, temperature detection equipment installed on the equipment body in the factory can monitor the temperature and interlock the equipment to ensure the safe operation of the equipment system. Due to factors such as vibration during equipment operation in the factory, the wiring of temperature detection equipment may become loose, causing fluctuations in temperature measurement values. False readings may affect the judgment of process operators, and temperature measurement point distortion may trigger interlocks erroneously, causing the shutdown of a single piece of equipment or even the entire unit, causing delays and failures in production. At the same time, the start-up and shutdown process seriously increases unnecessary production and operation costs.
[0019] To address the aforementioned problems, this application proposes a control system to prevent the temperature sensor from erroneously triggering the interlock. The embodiments of this application will be further described below with reference to the accompanying drawings.
[0020] Reference Figure 1This application provides a control system for preventing accidental triggering of interlocks by a temperature sensor, including a DCS safety barrier, a DCS control system, an ROC rate protection function module, an RS trigger, a maintenance bypass, a reset button, an electrical motor control cabinet, and a temperature detector installed on the field equipment body; the input terminal of the DCS safety barrier is connected to the output terminal of the temperature detector, the output terminal of the DCS safety barrier is connected to the input terminal of the DCS control system, the output terminal of the DCS control system is connected to the input terminal of the electrical motor control cabinet and the input terminal of the RS trigger, the first output terminal of the RS trigger is connected to the maintenance bypass through the ROC rate protection function module, and the second output terminal of the RS trigger is connected to the reset button.
[0021] It should be noted that DCS stands for "Distributed Control System"; and ROC stands for "Rate of Change".
[0022] In this embodiment, the temperature detector installed on the field device is a resistance temperature detector (RTD). The main function of the DCS safety barrier is to limit current and voltage, ensuring that the power supply and communication of the field instruments are within a safe range. In this embodiment, the resistance signal sent by the RTD is converted into a current signal of 4-20mA by the DCS safety barrier, and then the converted current signal is sent to the DCS control system.
[0023] It should be noted that by setting up a maintenance bypass, faults in the temperature monitoring system can be isolated in a timely manner, ensuring the normal operation of field equipment. The maintenance bypass can isolate the faulty part from the rest of the system, preventing accidents and thus protecting the safety of personnel and the integrity of equipment. At the same time, the maintenance bypass can facilitate equipment maintenance and repair, improve the safety and efficiency of maintenance personnel, and reduce the difficulty and cost of maintenance.
[0024] It should be noted that the RS flip-flop, short for Reset / Set Flip-Flop, is a basic flip-flop in digital circuits.
[0025] In this application, a temperature detector is used to monitor the temperature of field equipment in real time and transmit the obtained temperature detection signal to the DCS control system through a DCS safety barrier. The DCS control system receives the temperature detection signal and determines whether the temperature change value of the corresponding temperature detector exceeds a preset temperature change threshold within a preset interval. When the DCS control system detects that the temperature change value of the temperature detector exceeds the preset temperature change threshold within a preset interval, the DCS control system outputs an ON switch signal to the S input pin of the RS trigger. The RS trigger controls the ROC rate protection function module to automatically switch the temperature measurement point interlock of the temperature detector to the maintenance bypass, preventing equipment interlocking caused by abnormal measurement point display. Maintenance personnel inspect and repair the temperature detector. After confirming that it has returned to normal, they manually press the reset button to reactivate the temperature detector. This application, through this setting, can automatically switch the abnormal temperature measurement point interlock to the maintenance bypass via the trigger output, preventing equipment interlocking caused by abnormal measurement point display. This effectively avoids equipment shutdowns caused by temperature measurement point display distortion, saving equipment start-up and shutdown costs.
[0026] In some embodiments, the preset interval time set in the ROC rate protection function module is one minute, and the preset temperature change threshold is ±300℃. When the DCS control system detects that the temperature of the temperature detector changes by more than 300℃ per minute, the DCS control system outputs an ON switch signal to the S input pin of the RS trigger. The RS trigger controls the ROC rate protection function module to automatically switch the temperature measurement point interlock of the temperature detector to the maintenance bypass, preventing the equipment interlock from being triggered due to abnormal measurement point display. Maintenance personnel inspect and repair the temperature detector. After the inspection is completed and it is confirmed that it has returned to normal, the temperature detector is manually reactivated. When the DCS control system detects that the temperature of the temperature detector does not change by more than 300℃ per minute, but the temperature monitoring value detected by the temperature detector exceeds the preset temperature threshold corresponding to the field equipment, the DCS control system triggers the equipment interlock through the electrical motor control cabinet, causing a single piece of equipment or the entire unit to stop, pending inspection and repair by maintenance personnel.
[0027] In some embodiments, the preset interval time set in the ROC rate protection function module is 5 seconds, and the preset temperature change threshold is ±5℃. When the DCS control system detects that the temperature of the temperature detector changes by more than 5℃ every 5 seconds, the DCS control system outputs an ON switch signal to the S input pin of the RS trigger. The RS trigger controls the ROC rate protection function module to automatically switch the temperature measurement point interlock of the temperature detector to the maintenance bypass, preventing the equipment interlock from being triggered due to abnormal measurement point display. Maintenance personnel inspect and repair the temperature detector. After the inspection is completed and it is confirmed that it has returned to normal, the temperature detector is manually reactivated. When the DCS control system detects that the temperature of the temperature detector does not change by more than 5℃ every 5 seconds, but the temperature monitoring value detected by the temperature detector exceeds the preset temperature threshold corresponding to the field equipment, the DCS control system triggers the equipment interlock through the electrical motor control cabinet, causing a single piece of equipment or the entire unit to stop, pending inspection and repair by maintenance personnel.
[0028] Reference Figure 1 It is understandable that the control system to prevent the temperature sensor from accidentally triggering the interlock also includes a DCS relay. The input terminal of the DCS relay is connected to the output terminal of the DCS control system, and the output terminal of the DCS relay is connected to the input terminal of the electrical motor control cabinet.
[0029] It should be noted that the control signals sent from the DCS control system to the electrical motor control cabinet need to be relayed through the DCS relay. The main functions of the DCS relay include automatic adjustment, safety protection, and circuit switching. The relay acts as an automatic switch in the circuit, and can control a large current with a small current, thereby realizing the automatic control and protection of the circuit.
[0030] Reference Figure 1 It is understandable that the control system to prevent the temperature sensor from accidentally triggering the interlock also includes an alarm device, and the DCS control system is connected to the alarm device.
[0031] It should be noted that when the DCS control system detects that the temperature change value of the temperature detector exceeds the preset temperature change threshold at preset intervals, the control alarm device will activate the alarm operation to remind the operator that the temperature detector has distorted the measurement and cannot be used as a basis for judging normal operating conditions.
[0032] In some embodiments, a display module is provided, and the DCS control system is also connected to the display module. When the DCS control system detects that the temperature change value of the temperature detector exceeds the preset temperature change threshold at a preset interval, an alarm prompt for abnormal temperature appears in the display module of the process operation flow, reminding the process personnel that the measurement point has been distorted and cannot be used as a basis for judging normal operating conditions. After seeing the prompt, the process personnel contact relevant professionals for further judgment and contact the on-site equipment maintenance personnel to check the temperature measurement point. After the inspection and maintenance are completed and it is confirmed that the temperature has returned to normal, the temperature interlock is manually reactivated.
[0033] It should be noted that when the DCS control system detects that the temperature change value of the temperature detector exceeds the preset temperature change threshold within a preset interval, it automatically triggers the DCS temperature rate protection mechanism, switching the temperature measuring point to maintenance bypass. At the same time, a prompt message appears on the display module to remind the process operator of the abnormal temperature, effectively avoiding equipment shutdowns caused by distorted temperature measuring point displays, and saving on equipment start-up and shutdown costs.
[0034] Reference Figure 1 It is understandable that the RS flip-flop has an R input pin and an S input pin. The RS flip-flop is connected to the ROC rate protection function module through the S input pin, and the RS flip-flop is connected to the reset button through the R input pin.
[0035] It should be noted that the RS flip-flop has two input pins: the R input pin and the S input pin. When both input pins are low, the RS flip-flop remains in the previous state. When the R input pin is high and the S input pin is low, the RS flip-flop is set to the "reset" state, that is, the output Q is low and the output Q is high. When the R input pin is low and the S input pin is high, the RS flip-flop is set to the "set" state.
[0036] In this embodiment, the output terminal of the R input pin is the second output terminal of the RS flip-flop, and the output terminal of the S input pin is the first output terminal of the RS flip-flop.
[0037] Specifically, when the DCS control system detects that the temperature rise rate is within the normal range, the DCS control system's rate protection output is OFF under normal circumstances; when the DCS control system detects that the temperature change of the temperature detector exceeds 5°C per second or 300°C per minute but is within the normal range, the DCS control system outputs ON. The DCS control system outputs an ON switch quantity to the S input pin of the RS trigger, so that the RS trigger controls the ROC rate protection function module to automatically switch the temperature measurement point interlock of the temperature detector to the maintenance bypass, preventing the equipment interlock from being triggered due to abnormal measurement point display. Maintenance personnel inspect and repair the temperature detector, and after the inspection is completed and it is confirmed that it has returned to normal, they manually re-enable the temperature detector.
[0038] Understandably, the control system to prevent the temperature sensor from erroneously triggering the interlock also includes a NAND gate logic circuit. The output of the DCS control system is connected to the input of the electrical motor control cabinet through the AND gate of the NAND gate logic circuit. The output of the DCS control system is also connected to the input of the RS flip-flop through the NOT gate of the NAND gate logic circuit.
[0039] It should be noted that, as Figure 1 As shown, the combination of "AND" and "NOT" forms a NAND gate logic circuit, where AND is an AND gate and NOT is a NOT gate.
[0040] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0041] The above description is the preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications are also considered to be within the scope of protection of this application.
[0042] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.
Claims
1. A control system to prevent false triggering of interlocks by a temperature measuring device, characterized by, The control system for preventing the temperature detector from triggering interlock by mistake comprises a DCS safety barrier, a DCS control system, a ROC rate protection function module, an RS flip-flop, a maintenance bypass, a reset button, an electrical motor control cabinet and a temperature detector installed on a field device body. An input end of the DCS safety barrier is connected with an output end of the temperature detector, an output end of the DCS safety barrier is connected with an input end of the DCS control system, an output end of the DCS control system is connected with an input end of the electrical motor control cabinet and an input end of the RS flip-flop respectively, a first output end of the RS flip-flop is connected with the maintenance bypass through the ROC rate protection function module, and a second output end of the RS flip-flop is connected with the reset button. The control system for preventing the temperature detector from triggering interlock by mistake further comprises a DCS relay, an input end of the DCS relay is connected with an output end of the DCS control system, and an output end of the DCS relay is connected with an input end of the electrical motor control cabinet.
2. The control system to prevent false trip interlocks of a temperature measuring device of claim 1, wherein, The control system for preventing the temperature detector from triggering interlock by mistake further comprises an alarm device, and the DCS control system is connected with the alarm device.
3. The control system to prevent false trip interlocks of a temperature measuring device of claim 1, wherein, An R input pin and an S input pin are arranged in the RS flip-flop, the RS flip-flop is connected with the ROC rate protection function module through the S input pin, and the RS flip-flop is connected with the reset button through the R input pin.
4. The control system to prevent false triggering interlock of a temperature measuring device of claim 1, wherein, The control system for preventing the temperature detector from triggering interlock by mistake further comprises an AND gate logic circuit, an output end of the DCS control system is connected with an input end of the electrical motor control cabinet through an AND gate of the AND gate logic circuit, and an output end of the DCS control system is also connected with an input end of the RS flip-flop through a NOT gate of the AND gate logic circuit.
5. The control system to prevent false trip interlocks of a temperature measuring device of claim 1, wherein,