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What are the types of refrigeration compressors Introduction of refrigeration compression types【Detailed explanation】 Refrigerator compressor is hot and not cooling. Refrigerator compressor has been buzzing. After reading this, you will understand. Refrigerator compressorRefrigerator What is the working principle of the cooling plate Introduction to the working principle of the cooling plate【Detailed explanation】 An explosion in a building in Haikou caused 1 death and 10 injuries. The initial judgment was that the central air conditioner was leaking The air conditioner power is 4500w, and the 4A power cord 32A is open, why is it always tripped

Central Air Conditioning Maintenance: Basic Procedure for Chiller Failure Treatment

Central Air Conditioning Maintenance: Basic Procedure for Chiller Failure Treatment In order to ensure the safe, efficient and economical long-term normal operation of the chiller, it is very important to discover the hidden dangers of failures as early as possible during its use. Today, the editor of Service will give you an analysis of the basic procedures for troubleshooting the chillers of the central air-conditioning repairs in the United States. 1. Investigate and understand the process of failure 　　 1. Conduct a careful on-site inspection to understand the working conditions of each part of the chiller when the fault occurs, the location of the fault, and the severity of the hazard. 　　 2. Earnestly listen to the on-site operators to introduce the experience of the failure and the emergency measures taken. If necessary, respond to the failure, but it can be operated in a short period of time without causing the failure. The chiller or auxiliary device that deteriorates in one step starts the operation in person, and grasps the accurate perceptual basis for correct analysis of the cause of the failure. 3. Check the operation record table of the chiller, and pay special attention to the different normal operation data and problems that have occurred in the record table, as well as the operation time and reliability of the replaced and repaired parts; understand the safety protection shutdown caused by any reason, etc. Happening. The situation directly related to the occurrence of the fault cannot be ignored in particular. 　　 4. Ask the relevant personnel to seek their knowledge and views on the fault. When necessary, the operator is required to tell and demonstrate his operation method. 　　 Second, collect data and find the cause of failure 　　 1. Read the operation manual of the chiller in detail is an important source for understanding the various data of the chiller. "Operation Manual" can provide various parameters of the chiller (such as unit cooling capacity, compressor type, motor power, speed, voltage and current size, refrigerant type and charge, lubricating oil amount and oil level, manufacturing Date and machine number, etc.), list the possible causes of various failures. The comprehensive comparison of the parameters provided in the "Operation Manual" with the data of the chiller operation record table can provide an important basis for the correct diagnosis of faults: 2. The fault inspection of the unit should be in accordance with the electrical system (including power and control system), water system (including cooling water and chilled water system), oil system, refrigeration system (including compressor, condenser, throttle valve, evaporator) And pipes). The four major parts are carried out one by one. It is necessary to pay attention to find the compound factors that cause the failure, and to ensure stable, accurate and fast troubleshooting. 3. Analyze the data and diagnose the cause of the failure 　　 1. Combine the basic theory of the refrigeration cycle, analyze the collected data and data, and use the various parameters of the normal state of the refrigeration cycle as an important basis for comparative analysis of the collected data. For example, according to the analysis of the refrigeration principle, the compressor suction pressure of the chiller is too high, which causes the refrigerant circulation to increase, resulting in overload of the main motor. The reason for the high suction pressure of the compressor is related to the excessive refrigerant charge, the excessive opening of the thermal expansion valve and the float valve, the excessively high condensing pressure, and the excessive load of the evaporator. If the collected data finds that the suction pressure in the refrigeration system is higher than the suction pressure value specified in the theoretical cycle or the motor is overloaded, the refrigerant charge, evaporator load, condenser heat transfer effect, cooling water temperature, etc. can be used. Check the cause of the above failure. 　　 2. Use actual work experience to analyze data and information. After grasping all aspects of the normal operation of the chiller, once the actual situation differs from the accumulated experience, the cause of the failure can be found immediately from this difference. For example, when the piston chiller is started normally, there will be no "liquid hit" phenomenon. When the "liquid hit" occurs during the actual start process, and the oil level of the sight glass does not show the phenomenon of lubricating oil, then It can be judged that the liquid refrigerant sucked by the piston compressor does not originate from the lubricating oil in the dark axle box, but from the evaporator. In a piston chiller, the liquid refrigerant in the evaporator can only come from the high-pressure part during parking, that is, the high-pressure liquid refrigerant enters the evaporator through the solenoid valve and the thermal expansion valve. The expansion valve is controlled by a temperature-sensing package. It is normal for the expansion valve core to automatically open when the temperature of the IZl end of the evaporator rises after the chiller stops. Therefore, when the chiller is shut down, only the solenoid valve is not tightly closed to allow the high-pressure liquid refrigerant to enter the evaporator. From this analysis, it can be seen that the solenoid valve has malfunctioned, and the above-mentioned "liquid strike" phenomenon will be automatically eliminated after eliminating this malfunction. It can be seen that combining actual experience with theoretical analysis to analyze the collected data and data is conducive to grasping the essential cause of the fault through all phenomena and can be eliminated accurately and quickly. 　　 3. Perform data and data analysis based on the logical relationship of the chiller's technical fault. The logical relationship and inspection method of the technical fault of the chiller are effective measures for analyzing and checking the causes of various fault phenomena. Linking various actually collected data with this logical relationship can greatly improve the accuracy of determining the cause of failure and the speed of maintenance work. The faults that occur during the operation of the chiller are usually divided into three categories: ①The unit does not start; ②The unit operates but the cooling effect is not good, ③The unit frequently starts and stops. 4. Determine the maintenance plan 　　 1. Consider the maintenance plan from the perspective of feasibility 　　 The most important thing is how to complete the maintenance tasks with the most cost-saving funds (including materials, spare parts, labor, shutdown, etc.), and the funds should be controlled within the planned maintenance funds. When the total repair cost is close to or exceeds the cost of the newly purchased machine, the old machine should be scrapped if time permits. 　　 2. Consider the maintenance plan from the perspective of reliability 　　Usually, the treatment and maintenance plan for chiller failure is not single. From the perspective of the role played by the chiller after maintenance, it can be divided into three situations: temporary, transitional and long-term. Various maintenance programs are invested in funds, personnel, maintenance process requirements, and maintenance time. There are obvious differences between the length, the number of spare parts used and the quality of the quality. The appropriate plan should be determined according to the specific situation 　　3. Choose the maintenance plan with the least interference and impact on the surrounding environment 　　The maintenance process will cause safety and noise damage and environmental pollution to the structure and residents of the building, and should be avoided as much as possible. 　　 4. After careful analysis of the conditions in all aspects, I found a maintenance plan suitable for the actual situation on site. 　　Generally, these maintenance programs are applicable to one or several comprehensive actions of adjustment, modification, repair or replacement of failed components. 　　 Fifth, implement maintenance operations 　　 1. According to the requirements of the maintenance plan, prepare necessary accessories, tools, materials, etc., to achieve good quality, sufficient quantity, and timely supply. 2. When performing troubleshooting, the reverse steps of the inspection procedure should be followed, that is, the order of the four systems of fluorine, oil, water, and electricity, and troubleshooting, to avoid repair rework due to crossover of the fault and save maintenance time. Ensure repair quality. 　　 3. Properly use the knowledge of refrigeration and mechanical maintenance to operate. For example, the disassembly and assembly of compressors, the cleaning and maintenance of refrigeration systems, the commissioning and maintenance of control system equipment and components, brazing, electric welding, unit pressure test, leak detection, vacuuming, dehumidification, refrigerant and lubricant charging Note and discharge operations. 　　 4. The disassembled parts must be neatly arranged and marked so as to identify and prevent loss. 　　 5. When reassembling or replacing parts, the performance of the parts should be checked one by one to prevent unqualified parts from being installed in the unit and causing rework losses. 　　 VI. Inspection and maintenance results 　　 1. The purpose of checking the maintenance results is to investigate whether the chiller after maintenance has recovered to the technical performance before the failure occurred. Adopt the method of operating the unit under different working conditions to comprehensively assess whether the repair has brought new problems to the unit. Any problems found should be corrected immediately. 　　 2. The necessary acceptance test of the chiller shall be carried out in accordance with the principles of air tightness test, vacuum test, itemized test and complete machine test. It is not allowed to replace the vacuum pump with the compressor of the chiller unit for vacuum test, so as not to damage the compressor. 　　 3. In addition to checking the technical performance of the chiller, we must pay attention to protecting the clean appearance of the unit and the cleanliness of the work site. The work site must be cleaned, wiped off the oil stains, replaced parts and garbage, and finally clean the tools and accessories. The tools or accessories must not be forgotten in the chiller or work site. 　　 4. For the chiller caused by the operator's error, the maintenance personnel should work with the operator to troubleshoot or repair. Afterwards, carry out the unit's trial operation inspection, discuss the operation method suitable for the unit's characteristics, change the bad operation habits, and avoid the recurrence of similar failures.

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