1、Refrigeration compressor unit without vibration damping installation, or vibration damping effect is not good
According to the installation specification, should install the whole set of vibration damping device, if the vibration damping is not standardized or no vibration damping measures, will make the machine vibrate violently, easy to cause pipeline vibration cracks, equipment vibration, and even machine room vibration bad.
2、No or lack of refrigerant pipeline oil return curve
Refrigerant piping in the transverse turn upward bend, must be made into a small bend to the first sagging upward that is, U-bend, so that the pipeline and then upward to qualify, can not be made directly into a 90-degree turn upward, otherwise, the system inside the oil can not be very good to go back to the compressor, and a large number of deposition in the chiller, so that the fan and the entire system can not function properly, and even damage to the fan and the set of equipment.
3、Refrigerant piping connection is not balanced
Unit piping in the connection to a group of multiple compressors, to make the return oil balanced distribution to the compressor, must be set in the main pipeline interface is located in the middle of the head of a number of locations, and then set up some branch piping to both sides, so that the return oil balanced flow into a number of compressor branch pipe.
Moreover, each branch pipe should be equipped with a valve to regulate the oil return volume. If not, but from different parts of the main pipeline in turn lead to a number of downward branch pipe connected to a number of compressors, there will be an imbalance in the oil return, the first oil return is always the fullest, followed by one in turn for the return of oil gradually decreased. In this way, it is possible to make the first compressor operating faults, vibration is huge, oil pressure is too high, the unit overheating, so that the compressor cylinder \ hold dead and other accidents, so that the equipment is damaged.
4, the pipeline did not do insulation
If there is no insulation material, the cold pipeline will be in the ambient temperature frost, thus affecting the refrigeration effect, so that the unit load increases, which in turn makes the unit super-strength operation, reducing the service life of the unit.
5, to regularly check the technical indicators, timely adjustments
The operating temperature and pressure of the system, the amount of lubricating oil and refrigerant should be checked and adjusted in time. The system should have automatic control and compressor alarm device, once there is a problem, it will issue an alarm prompt, or automatic protective shutdown, compressor shutdown.
6, the maintenance of the unit
To regularly replace the lubricating oil, filter. According to the need to replenish refrigerant. Condenser should be cleaned at any time, keep clean, so as not to have dust, sand or flotsam debris, affecting the cooling effect.
Some people think that as long as there is no impurity, lubricants can continue to use, although it has been used for more than two years, also do not have to replace. This is obviously wrong. Lubricating oil in the system under high temperature operation for a long time, its performance may have changed, can not play the role of lubrication, etc., if not replaced, will make the machine operating temperature, or even make the machine damage.
Filters should also be replaced regularly. We know that the general machine have “three filters”, but also to be replaced regularly. Refrigeration compressor system may not have “three filters”, only an oil filter, should also be replaced regularly. If you think that the filter is metal, there is no need to replace the damage, this point of view is unfounded, is also untenable.
7. Installation environment and maintenance of chiller
The location and environment of the chiller inside the cold storage will affect its operation. Generally near the cold storage door near the chiller, easy to dew frost. As its environment is in the door position, when the door is opened, the hot airflow from outside the door enters, and when it meets the chiller, condensation and frosting, or even ice, occurs.
Although the chiller can be timed to automatically heat and defrost, but if the door is opened too often, open up too long, the hot airflow into the long time and the number of large, the fan defrost effect is not good. Because the defrosting time of the chiller can not be too long, otherwise the refrigeration time will be relatively shortened, the refrigeration effect is not good, the library temperature can not be guaranteed.
Some cold storage, because the door is too much, open the door too often, too long, no insulation measures at the door, no partition wall inside the door, so that inside and outside the cold, hot airflow direct exchange, near the door of the chiller is bound to encounter serious frost problems.
8、Drainage of water melted down when defrosting the chiller
This problem is related to the degree of frost. As the fan frost serious, will produce a large amount of condensate, fan water plate can not withstand, poor drainage, will leak down to the library floor, if there are stored goods below, will soak the goods. In this case, you can add a water catchment tray and install a thicker conduit to eliminate condensate.
Some chillers have the problem of water blowing from the fan and spraying onto the stored goods. This is also a fan frost problem in the hot and cold exchange environment, mainly fan fan page in the hot environment produced by condensation, rather than the fan itself defrost effect is good or bad. To solve the fan condensation problem, you must improve the environment.
Design in the library door within the partition wall, can not be canceled partition wall. If in order to facilitate the entry and exit of goods, and cancel the partition wall, the fan environment has changed, it can not achieve the cooling effect, defrost effect is not good, and even make the fan failure frequently, equipment problems.
9, condenser fan motor and chiller electric heating tube problem
This is a vulnerable component. Fan motors that run for a long time in a high-temperature environment will likely fail and be damaged. If it is very important to ensure the temperature of the cold storage, it is necessary to order some perishable parts for timely maintenance.
The electric heating tube of the chiller is also needed to have spare parts to be more insured.
10、Cold storage temperature and cold storage door problem
A cold storage room, the area of how much, how much stock, open how many doors, the door open and close the time and frequency of stock in and out of frequency, cargo throughput, are factors that affect the temperature of the library.
In general, the door of a cold storage room should be opened and closed no more than 8 times in a day. If the unlimited number of times of opening and closing, the mechanical parts of the automatic door of the cold storage room and the insulating material of the border will accelerate the wear and tear, and the electrical parts will be more prone to failure. If the cold storage area is large, the automatic door is less, each automatic door switch a lot of times, the mechanical burden is too heavy, there is bound to be a frequent door failure, the door accessories are also frequently damaged. In this way, the maintenance workload increases, and the timeliness of maintenance is also a problem. Because, the manufacturer can not specialize in arranging a person to wait for the few doors (perhaps only two doors in the cold storage). However, once the cold storage door failure, can not be opened in time, will affect the entry and exit of goods; or can not be closed, will make the cold storage temperature rises, the library temperature does not meet the requirements.
Cold storage design, construction and cold storage door settings and quantity, must be based on the amount of stock, switching door frequency, comprehensive arrangements. Cold storage using units should also be based on the design specifications, the rational use of cold storage, can not disregard the design conditions and the actual condition of the facilities, and increase the inventory and improve the turnover of goods, more than the normal load and capacity of the facilities and equipment. Otherwise, many problems will occur.
11、Fire safety of cold storage
Cold storage is generally about 20 degrees below zero, due to the low ambient temperature, not suitable for the installation of fire sprinkler systems. Therefore, fire prevention in cold storage should be more attention. Although the ambient temperature of the cold storage is low, however, if a fire occurs, there are combustible materials in the library, especially the inventory is often packaged in cardboard boxes and wooden boxes, it is very easy to burn. Therefore, the fire hazard of cold storage is also very large, cold storage must be strictly prohibited smoke and fire. At the same time, the chiller and its wire box, power lines, electric heating tubes, but also to frequently check to eliminate electrical fire hazards.
12、Condenser ambient temperature problem
Condenser is generally installed on the roof of the outdoor roof, in the summer temperatures in the environment, the condenser temperature itself is very high, so that the unit operation pressure. If there are many hot weather, you can add a pergola on the roof condensation, shading the sun, so that the condenser temperature is reduced to reduce the pressure on the machine, protect the unit equipment, so as to ensure the purpose of the cold storage temperature. Of course, if the capacity of the unit is enough to ensure the temperature of the warehouse, you can also not build a pergola.
Post time: Nov-22-2024
