Maintenance method of minus 17 ° C ultra-low temperature refrigerator

After the long-term use of the ultra-low temperature refrigerator of minus 17 °C, it is necessary to carry out certain maintenance work. If the user does not know how to carry out the maintenance work, you can contact the manufacturer to obtain the relevant maintenance methods.

The sub-17°C ultra-low temperature refrigerator compressor unit must change the refrigerating oil once a year, or decide whether to change the oil in advance according to the actual situation or the analysis of the oil product. Replace the oil filter when the oil pressure drops by 30% or the unit is running for half a year. Also check the presence of metal shavings in the filter to confirm the internal wear of the unit. Check and tighten the pipe connection of the spool and check the solenoid valve coil of the spool. Also check the insulation of the motor, add grease or lubricant to the motor bearings, check the contacts of the motor starter, and check the contactors of the motor starter.


The zero-low temperature system of the ultra-low temperature refrigerator of 17 °C needs to replace the drying filter of the oil returning system in time, clean the nozzle of the oil ejector, clean the accumulation in the sedimentation elbow, check the solenoid valve of the ejector loop to operate normally, and check the entire oil return. The connection line of the system is unobstructed.

The evaporator and condenser of the ultra-low temperature refrigerator with a temperature of minus 17 °C should check the water flow of the chilled water and the cooling water, check the water flow switch of the chilled water and the cooling water, check the charge of the refrigerant, check the water chamber and the end cover of the evaporator and the condenser. Screws. Confirm that there is no water leakage.

The cryogenic refrigerator with a temperature of minus 17 °C needs to check the refrigerant charge. After the unit is stopped, the refrigerant charge should be checked and adjusted. After the compressor and pump are shut down for four hours or more, the condenser and evaporation are performed. The pressure and temperature of the device are balanced. At this point, the refrigerant level should be visible from the sight glass and the refrigerant level should be recorded. And according to the original record, judge the sealing condition of the unit.

The maintenance method is as shown above. It is recommended that the user do the maintenance work, which is more conducive to the operation of the ultra-low temperature refrigerator with a temperature of minus 17 °C.

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What are the influencing factors of the industrial refrigerator with minus 200 degrees?

In order to better use the industrial refrigerator with a temperature of minus 200 degrees, you need to understand some influencing factors and how to avoid it.

The oil temperature will have an important effect on the viscosity of the industrial refrigerator with a temperature of minus 200 degrees. If the oil temperature is too low, the viscosity of the oil will increase, the fluidity will decrease, and it will not easily form a uniform oil film, so the expected lubrication effect cannot be achieved. It will also cause the flow speed of the oil to decrease, the lubrication amount to decrease, and the power consumption of the oil pump to increase; if the oil temperature is too high, the viscosity of the oil will decrease, and the oil film will not reach a certain thickness, so that the running parts are difficult to withstand the necessary working pressure. The deterioration of the lubrication condition and the intensification of the wear of the moving parts caused the failure of the -200 degree industrial refrigerator.

It is the guarantee that the industrial refrigerator oil of minus 200 degrees is driven by the oil pump and needs to overcome the flow resistance in the oil system pipeline to each working part. Without sufficient oil pressure difference, there is no guarantee that the lubrication system has sufficient lubrication and cooling oil and the power required to drive the energy regulating device. Therefore, the oil pressure difference of the industrial temperature of the minus 200 degree industrial refrigerator must be within a reasonable range. In order to fully lubricate and cool the moving parts of the unit, the energy adjustment device can be flexibly operated.

The height of the refrigerator oil level refers to the liquid level of the lubricating oil in the oil storage container. The oil storage container is provided with an oil level display device. Generally, the oil level in the oil storage container should be located at the lower position of the horizontal line of the mirror. The purpose of specifying the height of the oil level is to ensure that the amount of oil required to form the oil circulation is sufficient when the pump is in operation. If the oil level is too low, it may cause the pump to be insufficient, causing malfunction or damage to the equipment.

Try to avoid some operational errors in use, resulting in unavailability, but also need to understand the influencing factors.

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The difference between air-cooled and water-cooled 15P refrigeration units

Because the demand conditions are different, when the selected 15P refrigeration unit is air-cooled and water-cooled, what is the difference?

The air-cooled 15P refrigeration unit contains a heat-insulating water tank and water pump in its body, which is very convenient for installation and movement. However, it requires a higher working environment because it is cooled by hot air circulation. Therefore, if the ventilation effect of the installation workshop is not good, it will directly affect the cooling effect of 15 refrigeration units. In addition, if you want to put the refrigeration unit in a dust-free workshop with humidity requirements, then I advise you to modify the water-cooled. Because of the air-cooled refrigeration unit, water vapor is sprayed on the top of the machine to dissipate heat.

The water-cooled 15P refrigeration unit can be divided into open type, sealed type (some called box type) and screw type. It is necessary to declare that the water-cooled refrigeration unit must be additionally equipped with a cooling tower and a water pump for extracting hot water to dissipate heat. In order to achieve a better cooling effect.

Air-cooled 15P refrigeration units can be used on small systems, most of which are water-cooled. When the water is cold, the main engine is less than the air-cooled. In other words, the cooling efficiency of the water-cooled unit will decrease relative to the long-term operation, and the air cooling will not.

The air-cooled 15P refrigeration unit has a slightly higher investment than the water-cooled 15P refrigeration unit, but the annual operating cost is lower than that of the water-cooled refrigeration unit. The construction cost of the equipment room is relatively small in various refrigeration unit cold and heat source systems. The cost is about half the cost of water-cooled or boilers. The noise and volume of air-cooled chillers are larger than those of water-cooled units. This requires attention.

There is a certain difference between the air-cooled and water-cooled units of the refrigeration unit. I hope that you can understand the proper 15P refrigeration unit model.

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Low-temperature refrigerator manufacturers' energy adjustment instructions

The energy regulation of low-temperature refrigerator manufacturers' equipment during operation is also very important. In order to adapt to the change of energy load, Wuxi Guanya (LNEYA) low-temperature refrigerator manufacturers should pay attention to the energy regulation process.

In order to adapt to the load change of the refrigeration system during the operation of the low-temperature refrigerator manufacturer, the water temperature of the unit still needs to maintain its constant requirements, and the manufacturer will effectively accomplish this task through its energy adjustment. The control system of the -150 low temperature refrigerator manufacturer needs to first detect the water temperature of the unit, compare it with the set value, and then issue an energy adjustment command, which will increase or decrease the cooling capacity of the unit to a certain extent.

The manufacturer and the piston refrigeration compressor are the same. The adjustment of the energy of the equipment during the operation is also effective to adjust the cooling capacity by adjusting the displacement, and the energy of the compressor is mainly used during the operation. Adjustment mechanism to achieve.

The energy adjustment of the manufacturer's multi-head unit can also be realized directly by increasing or decreasing the number of compressors running. The control program can set the loading sequence of each compressor. Therefore, multi-head low temperature refrigerator manufacturers are more widely used in engineering practice due to their excellent partial load performance. The manufacturer's compact structure, stable operation, stepless adjustment of cooling capacity, good energy saving and less wearing parts.

The equipment of Wuxi Guanya (LNEYA) low-temperature refrigerator manufacturers is compact in structure and efficient in operation, saving resources to a certain extent.

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How to clean LNEYA low temperature refrigerator?

LNEYA low temperature refrigerators need to be cleaned after a long time of use. So, how should the cleaning be carried out? How to clean it is not wrong?

The low-temperature refrigerator cleaning includes the cleaning of the cooling water system and the cleaning of the chilled water system. The cleaning of the cooling water system is mainly to remove scales such as scale, biological slime and corrosion products from the inner wall of the pipeline and the heat exchange surface of the condenser. The cleaning of the chilled water system is mainly to remove deposits such as biological slime and corrosion products inside the evaporator heat exchange surface, the inner wall of the chilled water pipe, the inner wall of the fan coil and the air conditioning system equipment.

The low-temperature refrigerator is physically cleaned with a wire brush, brushed with a special scraper, and cleaned with a high-pressure water jet. And these methods are mainly applicable to water-cooled condensers and shell-and-tube evaporators. High-pressure water jet cleaning, this method can also be used to clean equipment such as pipes. When cleaning the heat exchanger, the ends of the heat exchanger must be removed, and the heat exchange tubes are washed one by one with a high pressure water gun. For pipes, high pressure water jets with flexible tips can be used for cleaning.

Low-temperature refrigerator chemical cleaning is a method of dissolving, loosening, peeling off or peeling off deposits in a device to be cleaned by the action of a chemical agent. Chemical cleaning is also commonly used in conjunction with physical cleaning. The round robin method is a widely used method. The cleaning equipment is formed into a closed loop by means of a temporary cleaning tank, the cleaning liquid is continuously circulated, and the deposition layer is continuously dissolved and detached by the chemical action and the flushing action of the fresh cleaning liquid.

The cleaning method of LNEYA low-temperature refrigerator is as shown above. If the user has problems in each accessory during the cleaning process, it is recommended to solve it in time.

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10hp freezer pipe cleaning instructions

The 10hp freezer is an industrial cold processing equipment from LNEYA. In the process of cooling using a chiller, if the pipeline is not cleaned properly, the refrigerator will be used, so the pipeline cleaning needs to be in place.

Remove the heat transfer medium before cleaning the 10hp freezer. Connect a suitable drain to the drain and allow it to flow into a suitable container (make sure the tube and container match the heat transfer media). Open the drain valve, the heat transfer medium flows from the external application to the pump chamber and then flows from the drain port to the container at low temperature to remove the heat transfer medium. Be sure to take protective measures to prevent low temperature frostbite. Open the freezer filling port and carefully purge the heat transfer medium in the system by carefully blowing nitrogen into the heat transfer medium outlet (pressure below 3BAR).

Replace 10hp freezer heat transfer oil / internal cleaning, please be careful not to use acetone as a cleaning solvent. Failure to do so will destroy the tightness of the 10hp freezer. After discharging according to the previous section, depending on the heat transfer medium, a lot of residue of the heat transfer medium remains in the pump chamber and the inner container. Fill in a suitable solvent, such as a silicone oil cycle to clean the internal components, including the pump chamber, internal vessels, conduits, etc. Depending on the situation of the contamination, it may be necessary to repeat this method several times. Then let the instrument open all the drain valves and connections. Please note that before using the new heat-conducting medium to control the temperature in ultra-low temperature operation, please be sure to remove the moisture in the system. Otherwise, the viscosity of the heat-conducting medium will increase when the temperature is low, and the heat transfer capacity will be reduced.

When cleaning the 10hp freezer pipe, be careful that the heat transfer medium must be cleaned, otherwise the media will cause the freezer to malfunction.

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12hp freezer heat transfer oil selection instructions

When choosing a 12hp freezer, users need to pay attention to the choice of heat transfer oil. For LNEYA, suitable heat transfer oil is very important. What should you pay attention to when choosing heat transfer oil?

The 12hp freezer adopts a fully enclosed circulation line. Only the heat transfer medium participates in the cycle. The temperature of the expansion tank is always maintained at 60 °C at normal temperature, which avoids the problems caused by air entering the circulation system. The selection and detection of the heat transfer oil of the 12hp freezer is generally carried out from the following four aspects. The viscosity change generally indicates the degree of contamination, thermal cracking and oxidative degradation of the heat transfer oil in the system. When the change is greater than 15%, it should be taken seriously. The flash point change indicates that there is low boiling in the system, and when the change is greater than 20%, attention should be paid. The change in acid value indicates that the heat transfer oil in the system is contaminated or oxidized. When the acid value reaches 0.5, attention should be paid. The increase in residual carbon value generally indicates that it is caused by sputum, corrosives, severe oxidation or severe thermal cracking, and should be taken seriously when it reaches 1.0 (m%).

After the test results are out, if the indicators are out of the range, the heat transfer oil is running well; if one or more of them are out of range, you should consider taking measures to replace the heat transfer oil to restore the heat transfer oil to a good condition. 12hp freezer has more heat transfer oil models, 12hp freezer should choose the right manufacturer's heat transfer oil.

Wuxi Guanya (LNEYA) recommends using the heat transfer oil of the relevant equipment manufacturer as well, and the miscellaneous brand of heat transfer oil may cause the 12hp freezer to operate poorly.

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