How many of these problems have you encountered with cold storage equipment
The installation of refrigeration system equipment and refrigerant pipelines, even the overall design of the cold storage and the daily use of the cold storage, must be done in strict accordance with the specifications. Any irregular design, installation, or use or maintenance will cause the refrigeration system to operate. Defects, and even cause malfunctions and damages to the operation of the machine. Common problems in the installation, maintenance and use of large-scale cold storage refrigeration equipment systems are as follows, let's take a look!
1. The refrigeration compressor unit has no vibration reduction installation, or the vibration reduction effect is not good
According to the installation specifications, the overall vibration damping device of the unit should be installed.If the vibration damping is not standardized or there is no damping measure, the machine will vibrate violently, which is easy to cause pipeline vibration, equipment vibration, or even machine room vibration.
2. No or lack of oil return bend in refrigerant pipeline
When the pipeline conveying refrigerant is turned from a lateral direction to an upward curve, it must be made into a small bend that first hangs down and then upwards, that is, a U-shaped bend, so that the pipeline is qualified if it goes upward, and it cannot be directly turned into a 90-degree turn upward. Otherwise, the oil in the system will not be able to return to the compressor well, and a large amount of oil will be deposited in the cooler, which will make the fan and the entire system not function properly, and even damage the fan and unit equipment.
3, the refrigerant pipeline connection is not balanced
When the unit pipeline is connected to a group of multiple compressors, in order to distribute the oil return to each compressor in a balanced manner, the main pipeline interface must be set in the middle of the multiple heads, and then some branch pipes are set to both sides. It allows the return oil to flow into multiple compressor branch pipes evenly.
Moreover, each branch pipe should be equipped with valves to adjust the amount of oil return. If this is not the case, but multiple downward branch pipes are drawn from different parts of the main pipeline to connect to multiple compressors, there will be uneven oil return. The oil return of the first unit is always full, and the oil return of the latter one is gradually reduced. In this way, it may cause the first compressor to malfunction, huge vibration, excessive oil pressure, and overheating of the unit. As a result, accidents such as compressor flushing/locking occurred, which damaged the equipment.
4. The pipeline is not insulated
If there is no insulation material, the cold pipe will be frosted at ambient temperature, which will affect the cooling effect, increase the load of the unit, and then make the unit super-intensive operation and reduce the service life of the unit.
5. Various technical indicators should be checked regularly and adjusted in time
The operating temperature and pressure of the system, the amount of lubricating oil and refrigerant, must be checked and adjusted in time. The system should have automatic control and compressor alarm devices. Once there is a problem, an alarm will be issued, or an automatic protective shutdown , The compressor stops.
6. Maintenance of the unit
The lubricating oil and filter should be replaced regularly. Refrigerant should be added as needed. The condenser should be cleaned and kept clean at any time to prevent dust, sand or flying debris from affecting the refrigeration effect. Some people think that lubricating oil can continue to be used as long as it has no impurities, although it has been used for more than two years and does not need to be replaced. This is obviously wrong. The lubricating oil has been running for a long time under high temperature in the system, its performance may have changed, and it cannot play the role of lubrication. If it is not replaced, it will increase the operating temperature of the machine, or even cause The machine is damaged.
The filter should also be replaced regularly. We know that general machines have "three filters" and they must be replaced regularly. The refrigeration compressor system may not have "three filters", only one oil filter, and it should be replaced regularly. If the filter is considered to be metal and not damaged There is no need to change, this view is baseless and untenable.
7. The installation environment and maintenance of the air cooler
The location and environment of the air cooler inside the cold storage will affect its operation. Generally, the air cooler near the door of the cold storage is prone to condensation and frost. Because its environment is at the door position, the hot airflow outside the door enters when the door is opened. When the air cooler, condensation and frost, or even icing occurs. Although the air cooler can automatically heat and defrost at regular intervals, if the door is opened too frequently, the opening time is too long, the hot air flow enters for a long time and the amount is large, the fan defrosting effect Not good. Because the defrosting time of the air cooler cannot be too long, otherwise the cooling time will be relatively shortened, the cooling effect will not be good, and the storage temperature cannot be guaranteed.
In some cold storages, due to too many doors, the frequency of opening the door is too high, the time is too long, there is no insulation measure at the door, and there is no partition wall inside the door, so that the cold and hot air flows inside and outside are directly exchanged, and the air cooler near the door will inevitably encounter serious problems. Frost problem.
8. Drainage of the melted water during the defrosting of the air cooler
This problem is related to the severity of frosting. Due to the severe frosting of the fan, a large amount of condensate will inevitably be produced. The fan's drain pan cannot bear it, and the drainage is not smooth. It will leak and flow to the ground in the warehouse. The cargo will be soaked. In this case, you can install a drain pan and install a thicker draft tube to remove the condensate.
Some air coolers have the problem of blowing water from the fan and spraying it on the storage of the library. This is also the problem of fan frosting in a cold and hot exchange environment, mainly due to the condensed water generated by the fan page in a hot environment, not The defrosting effect of the fan itself is good or bad. To solve the problem of fan condensate, the environment must be improved. In the design, there is a partition wall in the warehouse door, and the partition wall cannot be canceled. If the partition wall is cancelled in order to facilitate the entry and exit of the goods, the fan If the environment changes, the cooling effect will not be achieved, the defrosting effect will not be good, and even frequent fan failures and equipment problems.
9, condenser fan motor and air cooler electric heating pipe
This is a vulnerable part. The fan motor that runs for a long time in a high temperature environment may malfunction and be damaged. If the temperature of the cold storage is very important, it is necessary to order some vulnerable parts for timely maintenance. The electric heating tube of the air cooler also needs spare parts to be more safe.
10, cold storage temperature and cold storage door
A cold storage room, the area, the amount of inventory, how many doors are opened, the time and frequency of opening and closing of the doors, the frequency of inventory in and out, and the throughput of goods are all factors that affect the temperature in the warehouse.
Generally, the door of a cold storage room should be opened and closed no more than 8 times in a day. If you open and close an unlimited number of times, the mechanical parts and frame insulation materials of the automatic door of the cold storage will accelerate wear, and the electrical components are more prone to failure. If the cold storage is Large area, few automatic doors, many times of opening and closing of each automatic door, excessive mechanical burden, inevitably frequent door failures, and frequent damage to door accessories. As a result, the maintenance workload has increased, and the timeliness of maintenance has also become problematic. Because it is impossible for the manufacturer to arrange a person to wait for these few doors (maybe there are only two doors in the cold storage). However, once the cold storage door fails and cannot be opened in time, it will affect the incoming and outgoing goods; or if it cannot be closed, the temperature of the cold storage will rise, and the temperature of the cold storage will not meet the requirements. The design and construction of the cold storage and the setting and number of cold storage doors must be According to the inventory volume and the frequency of opening and closing doors, comprehensive arrangements. The cold storage user should also use the cold storage rationally according to the design specifications, and cannot ignore the design conditions and the actual status of the facility, blindly increase the inventory and increase the turnover of goods, and exceed the facilities and equipment. Normal load and bearing capacity. Otherwise, many problems will arise.
11. Fire safety of cold storage
The cold storage is generally around minus 20 degrees. Due to the low ambient temperature, it is not suitable for installing fire sprinkler systems. Therefore, more attention should be paid to the fire prevention in the cold storage. Although the ambient temperature of the cold storage is low, if a fire occurs, there are combustibles in the storage. In particular, inventory is often packed in cartons and wooden boxes, which are easy to burn. Therefore, the risk of fire in cold storage is also great, and the cold storage must be strictly prohibited from smoking. At the same time, the air cooler and its wire box, power cord, electric heating tube, etc. Check frequently to eliminate the hidden danger of electrical fire.
12, the ambient temperature of the condenser
The condenser is generally installed on the roof of the outdoor building. In the environment with high temperature in summer, the temperature of the condenser itself is very high, which increases the operating pressure of the unit. If there are many high temperature weather, you can add a pergola on the roof condensation. Block the sunlight and reduce the temperature of the condenser to reduce the pressure of the machine and protect the equipment of the unit, thereby ensuring the temperature of the cold storage. Of course, if the capacity of the unit is sufficient to ensure the temperature of the storage, it is not necessary to build a pergola.