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CN-122015934-A - Fault self-diagnosis system of high-low temperature damp-heat test box

CN122015934ACN 122015934 ACN122015934 ACN 122015934ACN-122015934-A

Abstract

The invention provides a fault self-diagnosis system of a high-low temperature damp-heat test box, and relates to the technical field of environment test equipment and fault diagnosis. The system comprises a sensor module, a self-diagnosis system circuit board, a PLC controller and an alarm module, wherein the core has dual functions of self-checking and inspection, the self-checking function can sequentially perform power-on detection on components such as a circulating fan, an electromagnetic valve and a heating circuit before a test, the potential faults are prejudged, and the inspection function monitors basic parameters and states of all core components in real time in the test operation and performs linkage inspection according to preset logic. The system is preset with an adjustable threshold value, fault judgment is accurate to a single component, manual disassembly equipment is not needed, data loss and time waste caused by test interruption can be effectively avoided, equipment operation reliability and maintenance efficiency are improved, and the system is suitable for fault diagnosis of high-low temperature damp-heat test boxes in the fields of electronics, automobiles, aerospace and the like.

Inventors

  • LI YONGJIE

Assignees

  • 河南司匠科技有限公司

Dates

Publication Date
20260512
Application Date
20260120

Claims (10)

  1. 1. The fault self-diagnosis system of the high-low temperature damp-heat test box is characterized by comprising a sensor module, a self-diagnosis system circuit board, a PLC controller and an alarm module; The sensor module collects working signals of all parts of the test box and transmits the working signals to the self-diagnosis system circuit board, the PLC controls the self-checking and inspection flow, and the alarm module outputs prompt information according to the fault judgment result; The fault self-diagnosis system is used for performing fault diagnosis on the high-low temperature damp-heat test box, and the high-low temperature damp-heat test box comprises an overlapping refrigerating system, a heating wire heating system, a boiler humidifying system and a circulating fan; The cascade refrigeration system comprises a compressor, a compressor fan, a condenser, a plate heat exchanger, an evaporator, an electromagnetic valve and an expansion valve, wherein the heating wire heating system comprises a heating disc, a heating wire and a solid relay, and the boiler humidifying system comprises a humidifying boiler water supply system, a humidifying rod and a solid relay.
  2. 2. The fault self-diagnosis system of a high-low temperature damp heat test chamber according to claim 1, wherein the sensor module comprises a pressure sensor, a temperature sensor, a rotation speed sensor, a conductivity sensor and a current transformer; The pressure sensor is used for detecting the suction pressure and the exhaust pressure of the compressor, the temperature sensor is used for detecting the ambient temperature, the water temperature, the condensation temperature, the dry heating prevention temperature and the expansion valve temperature, the rotation speed sensor is used for detecting the fan frequency, the conductivity sensor is used for detecting the water quality conductivity, and the current transformer is used for detecting the current signals of the compressor, the heating circuit and the humidifying circuit.
  3. 3. The fault self-diagnosis system of the high-low temperature damp-heat test chamber according to claim 1, wherein the self-diagnosis system circuit board is provided with a standardized input channel, and the channel numbering rule is that a first digit represents a monitoring category, a second digit represents a component type, a third four digit represents a serial number, and a letter represents a signal type; the monitoring category comprises basic monitoring items, compressors, electromagnetic valves, expansion valves, fans, solid state relays and alternating current contactors.
  4. 4. The fault self-diagnosis system of a high-low temperature damp heat test chamber according to claim 1, wherein the self-checking function of the fault self-diagnosis system comprises the steps of: S1, receiving a 12V self-checking power supply switch signal, and detecting a fault state of a self-checking circuit board; s2, if the self-checking circuit board has no fault, detecting an electric signal on the test box; S3, when the power-on signal is at a high level, sequentially carrying out power-on detection on the circulating fan, the electromagnetic valve, the heating circuit, the humidifying circuit and the secondary compressor, and judging the state of the component according to the acquired signal of the sensor and a preset standard; and S4, when the power-on signal is at a low level, waiting for the power-on of the test box.
  5. 5. The fault self-diagnosis system of the high-low temperature damp-heat test chamber according to claim 4, wherein the circulating fan self-checking step is as follows: s1, after the fan is electrified and operated for 10 seconds, detecting the frequency of the fan, and outputting a fault prompt when the frequency is not within the range of [ 1000 ] +/-100 ] Hz; S2, detecting an electric signal on the test box, and outputting a fan leakage prompt when the electric signal is in a low level.
  6. 6. The fault self-diagnosis system of a high-low temperature damp heat test chamber according to claim 4, wherein the solenoid valve self-checking step is: S1, sequentially powering on all solenoid valve coils by a PLC, wherein the power-on interval is 2 seconds; s2, detecting electromagnetic valve voltage and current signals, judging to be normal when the electromagnetic valve voltage and current signals are both in high level or in low level, and otherwise, outputting electromagnetic valve abnormality prompt; S3, synchronously detecting the power-on signal of the test box, and outputting an electromagnetic valve leakage prompt when the power-on signal is not in a high level.
  7. 7. The fault self-diagnosis system of a high-low temperature damp heat test chamber according to claim 4, wherein the heating circuit self-checking step is: S1, detecting the coil voltage of a heating solid-state relay, the coil voltage of a heating alternating-current contactor and three-phase heating current, and judging the normal state or the fault type according to signal combination; S2, the fault types comprise a heating solid state relay fault, a heating alternating current contactor fault, a heating solid state and alternating current contactor fault and a heating wire fault; S3, synchronously detecting the power-on signal of the test box, and outputting the leakage prompt of the heating circuit when the power-on signal is at a low level.
  8. 8. The fault self-diagnosis system of the high-low temperature damp-heat test chamber according to claim 1, wherein the inspection function of the fault self-diagnosis system comprises basic parameter inspection, circulating fan inspection, heating circuit inspection, humidifying circuit inspection, compressor current inspection, condensing fan inspection, electromagnetic valve inspection, expansion valve inspection and compressor pressure inspection, and each inspection module is sequentially linked according to preset logic, and the running state of the component is monitored in real time.
  9. 9. The fault self-diagnosis system of the high-low temperature damp-heat test chamber according to claim 1, wherein the self-diagnosis system circuit board preset threshold value comprises an ambient temperature of less than or equal to [ 30 ], a condensation temperature of less than or equal to [ 38 ], a dry burning prevention temperature of less than or equal to [ 110 ], a water quality conductivity of less than or equal to [ 20 ] μs/cm, a secondary compressor exhaust pressure of less than or equal to [ 20 ] bar, and an air suction pressure of less than or equal to [ 2 ] bar, and the threshold value can be adjusted by an installation engineer according to practical conditions.
  10. 10. The fault self-diagnosis system of the high-low temperature damp-heat test box according to claim 1, wherein the alarm module outputs fault information through audible and visual prompts and text display, and the fault information comprises 'beg to surrender low ambient temperature or water temperature', 'please clear condenser', 'humidification box lack of water', 'please improve water quality', 'no pressure of a secondary compressor', 'low pressure of the secondary compressor', and abnormal prompts of all parts, so that accurate tracing of faults is realized.

Description

Fault self-diagnosis system of high-low temperature damp-heat test box Technical Field The invention relates to the technical field of environmental test equipment and fault diagnosis, in particular to a fault self-diagnosis system of a high-low temperature damp-heat test box. Background The high-low temperature damp-heat test box is key equipment for simulating high-temperature, low-temperature and damp-heat environments experienced by products in the processes of storage, transportation and use, and is widely applied to product reliability tests in the fields of electronics, automobiles, aerospace and the like. The existing high-low temperature damp-heat test box mainly comprises refrigerating, heating, humidifying and other systems, but in the long-term operation process, parts such as a compressor, a fan, an electromagnetic valve, a heating wire, a humidifying rod and the like are prone to faults, and the traditional fault detection mode mainly relies on manual periodic investigation or backtracking after test interruption, so that the following problems exist: the fault detection is lagged, potential faults cannot be prejudged in advance before or during the test, the test is easily interrupted, and data loss and time waste are caused; the fault diagnosis is inaccurate, the fault part and the fault type are difficult to accurately locate by relying on manual experience judgment, and the maintenance efficiency is low; The operation is complicated, equipment is required to be disassembled or the machine is stopped for detection in manual investigation, and maintenance cost and equipment loss risk are increased. Therefore, it is highly desirable to design a high-low temperature damp-heat test box with integrated fault self-diagnosis function, so as to realize early warning, accurate positioning and convenient maintenance of faults, and solve the technical pain point. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a fault self-diagnosis system of a high-low temperature damp-heat test box, which realizes the real-time fault monitoring in the verification and test of the state of a part before the test, improves the running reliability and the maintenance efficiency of equipment, and solves the problems of lag fault detection, inaccurate diagnosis and complex operation of the traditional high-low temperature damp-heat test box. In order to achieve the above purpose, the invention is realized by the following technical scheme: a fault self-diagnosis system of a high-low temperature damp-heat test box comprises a sensor module, a self-diagnosis system circuit board, a PLC controller and an alarm module, wherein the core functions are a self-checking function and a patrol checking function; the sensor module comprises a pressure sensor, a temperature sensor, a rotation speed sensor, a conductivity sensor and a current transformer, and is used for collecting working signals of all parts of the test box, and the sensor module specifically comprises: the pressure sensor detects the suction pressure and the discharge pressure of the compressor; The temperature sensor detects the ambient temperature, the water temperature, the condensation temperature, the dry-heating prevention temperature and the expansion valve temperature; the rotating speed sensor detects the frequency of the fan; The conductivity sensor detects the conductivity of water quality; the current transformer detects current signals of the compressor, the heating circuit and the humidifying circuit. The self-diagnosis system circuit board is provided with a standardized input channel, the channel numbering rule is 'first digit (monitoring category) +second digit (component type) +third four digit (serial number) +letter (signal type)', and the monitoring category comprises basic monitoring items, compressors, electromagnetic valves, expansion valves, fans, solid-state relays and alternating-current contactors, and the monitoring category is used for receiving sensor signals and preprocessing; The PLC controls the self-checking and inspection flow, and realizes the functions of part sequential power-on, signal acquisition triggering, fault logic judgment and the like; The alarm module outputs fault information through sound and light prompt and text display, and realizes visual fault prompt. The fault self-diagnosis system is used for performing fault diagnosis on the high-low temperature damp-heat test box, and the high-low temperature damp-heat test box comprises an overlapping refrigerating system, a heating wire heating system, a boiler humidifying system and a circulating fan; The cascade refrigeration system adopts a cascade refrigeration technology and comprises a first-stage compressor, a second-stage compressor, a compressor fan, a condenser, a plate heat exchanger, an evaporator, electromagnetic valves (7 are arranged, and comprise a condensation expansion electromagnetic valve and a high-temperature-s