LNEYA closed cycle refrigerator maintenance instructions

LNEYA closed cycle refrigerators should start to pay attention to their maintenance work after a long time of use, then how to carry out maintenance work? How to do maintenance work for it?

According to the specific use environment and the frequency of using the closed cycle refrigerator, if the use time is short and the running power is relatively low, the maintenance period of the equipment can be extended appropriately during maintenance. For many special enterprises, in order to maintain the safety and stability of the equipment in the long-term uninterrupted use, it is recommended to adjust the maintenance period to half a year. The maintenance cycle can be shortened, and it is possible to find out whether there is a fault and perform effective maintenance in a timely manner, and keep the closed cycle refrigerator in a normal operating state, so that the space temperature can be reduced with less cost.

As a core component of a closed cycle refrigerator, if there is a fault, the normal use of the compressor is directly jeopardized, so the compressor is taken as the main maintenance item during maintenance. It can timely analyze the operating status of the equipment compressor and determine whether the equipment compressor is in overload operation, which can guarantee the long-term safety of the enterprise.

Many companies ignore the detection of pressure gauges when maintaining closed cycle refrigerators. If there is a problem with the pressure gauge, when using a closed cycle refrigerator, it is easy to cause problems such as abnormal pressure changes in the equipment. If it is used for a long time under abnormal pressure, the safety of use will continue to decrease, and even some unexplained failures will threaten the normal use of closed-cycle refrigerators. The lower the cost of closed-loop refrigerators, the closed-loop refrigeration. The higher the efficiency of the machine to reduce the space temperature.

In order to improve the use efficiency of the closed cycle refrigerator, it is necessary to carry out comprehensive inspection on a regular basis, which is advantageous for eliminating various failures and prolonging the service life.

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Analysis on the maintenance work of the screenless freezer

The screen-removing freezer is a kind of equipment used in industrial cold processing. The manufacturer of LNEYA screen-opening freezer reminds everyone that if the screen-removing refrigerator is used for a long time, maintenance work needs to be carried out, then how to carry out maintenance work What?

Compressor is a very important component in the screen refrigerating machine. The quality of the refrigeration compressor is directly related to the stability of the unit. If the refrigeration compressor fails. Due to the high installation accuracy requirements of the screw refrigeration compressor, it is generally necessary to ask the factory for maintenance.

The screen chiller drying filter is an important part to ensure the normal circulation of the refrigerant. Since water and refrigerant are incompatible with each other, if the system contains moisture, it will greatly affect the operating efficiency of the screen-removing refrigerator. Therefore, it is very important to keep the internal drying of the system. The filter element inside the drying filter must be replaced regularly.

The condenser and evaporator on the screen refrigerating machine are all pressure vessels. According to the regulations, a safety valve should be installed on the high pressure end of the screen refrigerating machine, that is, the condenser body. Once the screen refrigerating machine is in an abnormal working environment, The safety valve can automatically relieve pressure to prevent high pressure damage to the human body. Therefore, the regular calibration of the safety valve is very important for the safety of the entire screen-removing refrigerator.

The cooling water of the water-cooled condenser in the screen refrigerating machine is an open circuit. When the content of calcium salt and magnesium salt in the water is large, it is easily decomposed and deposited on the cooling water pipe to form scale, which affects heat transfer. Excessive fouling also reduces the flow cross section of the cooling water, reduces the amount of water, and increases the condensing pressure. Therefore, when the water quality of the cooling water used is poor, the cooling water pipe is cleaned at least once a year to remove scale and other contaminants in the pipe. There are usually two ways to clean the condenser water pipe: one is to clean the pipeline with a special pig cleaning gun; the other is to use a special cleaning agent to circulate, or to fill the cooling water, and then replace the solution after 24 hours. Until washed.

After the long-term use of the screen-removing refrigerator, the oil quality of the lubricating oil (refrigerated oil) deteriorates, and the impurities and moisture inside the oil increase, so it is necessary to observe and check the oil quality regularly. Once the problem is found, it should be replaced in time. The replacement lubricant (refrigerated oil) label must conform to the technical data.

If there is no other special reason, the general screen chiller will not produce a lot of leaks. If a certain amount of refrigerant leaks due to improper use or after repair. It is necessary to re-add the refrigerant. Filling the refrigerant must pay attention to the label of the refrigerant used in the screen chiller.

The maintenance work of the screen refrigerating machine can avoid some faults to a certain extent, which is beneficial to effective operation and reduce the operating cost of the enterprise.

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Closed hot and cold cycle machine compressor fault repair process

LNEYA's closed-type hot and cold cycle machine adopts single-machine self-cascading refrigeration technology, and its compressor also uses the brand compressor, which is more stable in performance. Therefore, it is easy to choose a series of compressors with general performance. malfunction.

If the screw compressor is used in the closed type hot and cold cycle machine, the operation and maintenance process is very simple. Before the screw compressor of the closed type hot and cold cycle machine must be overhauled, if possible, the slide valve is unloaded to the “0” position. , normal shutdown, cut off the power. The compressor can be disassembled by cutting off the piping connected to the compressor and discharging the refrigerant and lubricating oil in the compressor. Be careful to develop good habits when disassembling. Parts of different parts should be placed separately and the necessary assembly marks should be made.

After removing the pipes, couplings and anchor bolts connected to the compressor of the closed type hot and cold cycle machine, the compressor is lifted to the workplace. Remove the suction filter, suction check valve, and remove the energy indicator. Remove the locating pin, remove the suction end cap in parallel, and take out the oil piston and balance piston. Note that when the positioning pin is taken, it can only be pulled out and cannot be pulled out. Be sure to take out the positioning pin first, then remove all the bolts to prevent the weight of the suction end cover from acting on the positioning pin and bend the positioning pin. Remove the shaft cover and remove the shaft seal. Be careful not to touch the moving and stationary rings, remove the positioning pin, remove the exhaust end cap, and remove the bearing gland, lock nut, washer, thrust bearing, adjusting pad, etc. To remove the locknut, use a special special tool and first open the lock tab of the lock washer. Mark them at any time and place them separately. After removing the compressor positioning pin, remove the exhaust end seat and use the special eye bolt to slowly and smoothly remove the active rotor, and do not collide with the body. At this time, the driven rotor rotates accordingly, and the driven rotor is taken out and the spool is taken out.

Wuxi Guanya (LNEYA) closed type hot and cold cycle compressor adopts Hanzhong, Bitzer, Copeland, Danfoss and other brands, and its performance is reliable. It is suitable for refrigeration, chemical and other industries, and has been highly praised by users.

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Mail：sales@cnzlj.com
TEL：+86-0510-88585980

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Manufacturer analysis - 90 ° C single-stage refrigeration system compressor common form

There are many types of compressors in the -90 °C single-stage refrigeration system. The most used ones are the piston refrigeration compressors. So, do you know which types?

In the refrigeration system industry, the more commonly used refrigeration compressors are screw, piston and centrifugal. Piston compressors are mostly used in the -90 ° C single-stage refrigeration system of the box-sealed structure (called water-cooled box - 90 ° C single-stage refrigeration system), which is divided into fully enclosed, semi-closed and sealed according to the sealed type. Open three.

The -90 °C single-stage refrigeration system semi-hermetic compressor is characterized in that the body and the motor housing are bolted and sealed with a gasket to form a closed fuselage. The motor is mounted directly on the crankshaft of the compressor. The sealability of this compressor is better than that of the open type, which reduces or even avoids leakage.

The -90 °C single-stage refrigeration system open-type compressor is characterized in that the power input end of the shaft extends out of the body and is coupled to the motor by a transmission such as a coupling or a pulley. The crankshaft extends out of the body and is sealed by a shaft sealing device. Since it is impossible to achieve sealing by the shaft sealing device, leakage of refrigerant and lubricating oil in the refrigeration system and infiltration of outside air are inevitable. Therefore, such a compressor is not suitable for a small automatic refrigeration system without a small amount of filling and without an air separator.

-90 °C single-stage refrigeration system Fully enclosed compressor is characterized in that the body and the motor are installed together in a closed casing, and the joints of the casing are welded. From the appearance, only the suction, exhaust pipe and the terminal of the motor, the sealing performance of this compressor is good. Regardless of the type of piston refrigeration compressor used, this single-stage refrigeration system can be collectively referred to as a piston single-stage refrigeration system, and is one of the commonly used models in various industries.

Wuxi Guanya (LNEYA)-90°C single-stage refrigeration system manufacturers choose the compressor according to the corresponding model. In the compressor brand selection, the brand manufacturer compressors are selected, which is more stable in performance.

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How to solve the problem of insufficient cooling capacity of semiconductor cooling cycle system？

The semiconductor cooling cycle system is a device for cooling the semiconductor heating part. LushiA reminds that if the cooling capacity is insufficient during the operation, it is necessary to check in time to see if something has gone wrong.

When the cooling capacity of the semiconductor cooling cycle system is insufficient, it is first determined whether the filter is blocked. The blockage of the filter includes: suction filter blockage and dry filter blockage. At this time, it only needs to be cleaned and cleaned.

By observing whether it is the reason why the expansion valve of the semiconductor cooling circulation system is too small or too large, the amount of water is adjusted. The problem of leakage of the filling agent in the temperature sensor of the expansion valve can be solved by opening the cooling tower. A dirty or blocked ice valve can be solved by cleaning.

In the semiconductor cooling cycle system, the bearing clearance after the bearing wear is too large, and the problem of insufficient cooling capacity can be solved by inspection and replacement. Use components with precise structure, high reliability and long life. To ensure the stable operation of the unit. The condenser is a shell-and-tube condenser that optimizes temperature field distribution and refrigerant flow field distribution, and has high heat exchange efficiency. The outer fin design of the heat exchange tube enhances the heat exchange condensation and improves the heat exchange efficiency outside the tube.

Insufficient refrigerant charging in the semiconductor cooling cycle system, excessive refrigerant leakage, etc. may also cause insufficient cooling capacity of the semiconductor cooling cycle system. These problems can be achieved by adding or subtracting refrigerant recharge amount, leak detection, and adding refrigerant after maintenance. solve. The evaporator is used with too small evaporator to thicken the frost>There is a large amount of lubricating oil in the evaporator or the outlet valve of the liquid reservoir is too small, the cooling water is insufficient or the water temperature is too high, so the semiconductor cooling circulation system will be cooled. Not enough. If the evaporator is too small, it can reduce the heat load or replace the evaporator. If the evaporator frost is too thick, it needs to be frosted regularly. There is a lot of lubricating oil in the evaporator, and the refrigeration oil, condenser or reservoir is recovered. The outlet valve is opened too small, and the outlet valve is properly opened.

In addition, there is excess air in the refrigeration system of the semiconductor cooling cycle system, and the energy adjustment indication is incorrect and needs attention. Excess air in the refrigeration system can be solved by discharging air. If the energy adjustment indication is incorrect, the indicator light may be broken and can be solved by inspection and replacement.

The reason for the insufficient cooling capacity in the semiconductor cooling cycle system is as shown above. It is recommended that users find out that they can contact the manufacturer in time for after-sales solution.

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TEL：+86-0510-88585980

Semiconductor heating and cooling thermostat compressor fault detection instructions

In the semiconductor heating and cooling thermostat, the compressor is one of its core components. Once it fails, it will affect the operation of the whole system. How to solve the fault is better?

The faults of semiconductor heating and cooling thermostat compressors can be divided into motor faults and mechanical faults (including crankshafts, connecting rods, pistons, valve plates, cylinder head gaskets, etc.). Mechanical failure often causes the motor to overload or even stall, which is one of the main causes of motor damage.

The compressor motor load includes the load required to compress the gas and the load required to overcome the mechanical friction. If the pressure ratio is too large, or the pressure difference is too large, the compression process will be more difficult; the frictional resistance caused by the lubrication failure will increase, and the motor stall in extreme cases will greatly increase the motor load. Lubrication failure and increased frictional resistance are the primary causes of load anomalies.

The short circuit caused by the metal shavings of the compressor, the metal chips trapped in the windings are the main culprit for the short circuit and the low grounding insulation value. The normal vibration of the compressor during operation and the twisting of the winding by the electromagnetic force at each start-up will promote the relative motion and friction between the metal chips interposed between the windings and the winding enameled wire. Sharp edges and swarf can scratch the enameled wire insulation and cause a short circuit.

Compressor contactor problems, contactors can meet demanding conditions such as fast cycling, continuous overload and low voltage. They have a large enough area to dissipate the heat generated by the load current, and the choice of contact material prevents soldering at high currents such as startup or stall. In order to be safe and reliable, the compressor contactor must simultaneously disconnect the three-phase circuit. The method of disconnecting the two-phase circuit is not recommended.

The rated current of the compressor contactor must not be lower than the rated current on the compressor nameplate. Contactors with small specifications or poor quality cannot withstand compressor start-up, large current surges during stalling and low voltage, and are prone to single-phase or multi-phase contact jitter, soldering or even falling off, causing motor damage.

Semiconductor heating and cooling thermostat compressors may have more faults. It is not recommended for users to solve them themselves. It is recommended to contact the manufacturer for after-sales service.

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Maintenance instructions for compressors at minus 85 degrees ultra low temperature freezer

The compressor in the ultra-low temperature freezer of minus 85 degrees is one of the main components,and its performance is very important, so maintenance is also very important.

For manufacturers of sub-85 degree ultra-low temperature freezer compressor systems, the detection and replacement cycle of compressor refrigeration oil is related to the process control of its production. If the cleanliness control of the evaporator and condenser of the system and the system piping are better, then relatively less pollutants enter the compressor, and the detection and maintenance cycle can be relatively longer.

The acidification of the sub-85 degree ultra-low temperature freezer compressor lubricating oil will directly affect the life of the compressor motor, so it should be checked regularly whether the acidity of the lubricating oil is qualified. Generally, the acidity of the lubricating oil should be replaced if it is lower than PH6. If the acidity cannot be checked, the system's drying filter should be replaced periodically to keep the system dryness under normal conditions. If the contaminants in the refrigerating oil and the water content exceed a certain value, it is recommended to replace the refrigerating oil.

The lubricating oil in the ultra-low temperature freezer of minus 85 degrees can form a dynamic seal between the screw and the compression chamber and the male and female screws, reducing the leakage of the refrigerant from the high pressure side to the low pressure side during the compression process. The compressed refrigerant is cooled, and the oil is injected into the compressor to absorb the heat generated by the refrigerant gas during the compression process, thereby reducing the exhaust gas temperature. An oil film is formed between the bearing and the screw to support the rotor and to lubricate. The differential pressure force is transmitted, and the capacity adjustment system is driven to adjust the position of the volume adjustment slider through the action of the compressor's loading and unloading solenoid valve, thereby realizing the compressor capacity adjustment control and reducing the running noise.

The internal lubricating oil of the sub-85 degree ultra-low temperature freezer compressor is the key to maintain the normal operation of the compressor. The general lubricating oil problems include: foreign matter mixing, causing lubricating oil pollution, blocking the oil filter; high temperature effect causing lubricating oil degradation, losing lubrication function ;-85 degrees ultra-low temperature freezer system water pollution, acidification, erosion of the motor.

Wuxi Guanya (LNEYA) sub-85 degree ultra-low temperature freezer compressors are branded manufacturers of compressors, including Emerson, Du Ling, Bitzer, Hanbell and other brands, may be less in the failure rate, but still need Regular maintenance.

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-80 °C refrigerator manufacturer operating equipment points

When the user chooses the -80 °C refrigerator, it is definitely necessary to have a reliable quality. Wuxi Guanya (LNEYA)-80 °C refrigerator should pay attention to its operation details during operation to avoid equipment failure caused by improper operation.

The following items should be mastered during use. Please check if the -80 °C refrigerator is damaged during installation, and choose the right place for installation and future maintenance. The site where the unit is installed must be the floor, mounting mat or foundation with a level of 6.4 mm and can withstand the operating weight of the unit. - It should be placed in a machine room with a room temperature of 4.4-43.3 °C. There should be enough space around and above the unit for routine maintenance work. A pipe space for cleaning the condenser tube bundle should be left at one end of the device, or a door hole or other suitable hole can be used.

Select the water pipe of the appropriate pipe diameter, the cooling system and the cold water system of the -80 °C refrigerator unit during high power operation, and connect them correctly. For normal applications, the water flow rate through the evaporator and condenser is between 1.0 and 3.6 m/s.

Under any load, the water flow rate should be stable. All chilled water and cooling water pipes should be designed and installed according to the conventional method. The chilled water pump should be located on the inlet pipe of the unit to ensure the positive pressure and flow in the unit. The piping should be provided with a damping tube to ensure proper flexibility and to prevent the evaporator water from being drained when the pump is shut down. The piping should have a solid support independent of the -80 °C refrigeration unit to prevent stress from being applied to the refrigeration unit components. The hangers are set up to facilitate pipe alignment.

-80 °C refrigerator manufacturers will provide corresponding instructions when the equipment is shipped from the factory, users need to read and operate carefully when using.

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Summary - the cause of the failure of the 85 ° C ultra-low temperature refrigerator

-85 ° C ultra-low temperature refrigerator in industrial cold treatment, with the development of industry, the scope of use is also wider. However, in the process of use, it will inevitably lead to failure, so how much do you know about common faults?

-85 °C ultra-low temperature refrigerator pressure is low, when the actual gas consumption is greater than the output gas volume, it will cause deflation valve failure, intake valve failure, hydraulic cylinder failure, load solenoid valve failure, the above failure will lead to pressure switch failure. -85 °C ultra-low temperature refrigerator exhaust pressure is too high, intake valve failure; hydraulic cylinder failure; load solenoid valve failure; pressure setting is too high; pressure sensor failure; pressure gauge failure; pressure switch failure.

-85 ° C ultra-low temperature refrigerator exhaust temperature is higher, may be due to the coolant level in the refrigerator is too low; oil cooler is dirty; oil filter core is blocked; temperature control valve failure; oil cut solenoid valve is not powered or The coil is damaged; the diaphragm of the oil-disconnecting solenoid valve is broken or aged; the fan motor is faulty; the cooling fan is damaged; the exhaust duct is not smooth or the exhaust resistance is large; the ambient temperature is outside the specified range; the temperature sensor is faulty; the pressure gauge is faulty.

-85 °C ultra-low temperature refrigerator with high fuel consumption or compressed air with large oil content, too much cooling dose, the correct position should be observed during loading, the oil level should not be higher than half; the return pipe is blocked; the installation of the return pipe does not meet the requirements The exhaust pressure is too low during operation; the oil separation core is broken; the internal separator of the separation cylinder is damaged; there is oil leakage; the coolant is deteriorated or overdue.

-85 °C ultra-low temperature refrigerator with large current, low voltage; loose wiring; pressure exceeds rated pressure; oil separation core is blocked; contactor failure; host failure; main motor failure; failure to start, fuse is broken; temperature switch is broken; The main motor thermal relay operates; the fan motor thermal relay operates; the transformer is broken; there is no power input; the fault is not eliminated; the controller is faulty. Fan motor overload, fan deformation; fan motor failure; fan motor thermal relay failure; loose wiring; cooler blockage;

If the above fault occurs in the -85°C ultra-low temperature refrigerator, it needs to be solved in time to avoid these common faults affecting normal operation.

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5P hot and cold water machine installation instructions

The 5P hot and cold water machine is used in various industries and is used for cold treatment. So what problems do you need during installation and maintenance?

If the 5P hot and cold water unit refrigeration compressor unit does not have vibration reduction installation, or the vibration reduction effect is not good, according to the installation specifications, the overall vibration damping device should be installed. If the vibration reduction is not standardized or there is no vibration reduction measure, the machine will vibrate severely. It is easy to cause the pipe to crack, 5P hot and cold water machine equipment is damaged, and even other equipment is damaged.

There is no or lack of oil return bend in the refrigerant line of the 5 hot and cold water integrated machines. When the pipeline conveying the refrigerant turns upward from the lateral direction, it must be made into a small bend that is first down and then upwards, that is, a U-bend, so that the 5P hot and cold water integrated machine pipelines are qualified only upwards, and cannot be directly Make a 90 degree steering upward, otherwise the oil in the system can not be returned to the compressor very well, and a large amount of deposition in the equipment, so that 5P hot and cold water machine and the entire system can not function properly, or even damage the equipment .

5P hot and cold water machine integrated machine refrigerant pipeline connection is not balanced, when the unit pipeline is connected to a group of multiple compressors, to make the oil return equal distribution to each compressor, the main pipeline interface must be set at multiple stations. In the middle position of the machine head, then set some branch lines to the two sides to balance the return oil into multiple compressor branch pipes.

The models and designs of the 5P hot and cold water machines of different manufacturers are different. When the LNEYA equipment is issued, the corresponding instruction manual will be attached to give the customer a detailed explanation.

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What are the price factors affecting 60P freezers?

When users choose 60P freezers, they are very concerned about the price. Then the factors affecting the price, Wuxi Guanya (LNEYA) need to make everyone understand.

The freezer brand is an important intangible asset of a company or product, and is also an important reference factor for end consumers. Therefore, the impact of price on the brand has a large proportion. For big brands, guaranteed brands will naturally be reflected in the price of the freezer. Of course, this kind of manifestation must be based on a high degree of confidence in the free brand, so although the price of a good brand is high, but from a cost-effective point of view, it will be very high, which is why many companies would rather increase their budgets, not buying small brands. the reason.

Industrial refrigeration equipment on the market is popular and demand is strong, which will affect the price of 60P chiller units to a certain extent. The impact of this factor will be reduced due to the sufficient supply in the market. Similarly, in the peak season of sales, the price of such 60P freezers will be higher. For example, our refrigerators are in high demand during the peak season. This market-oriented price fluctuation will not have an essential impact on prices. However, companies can also choose a reasonable time when purchasing, avoiding these unnecessary passives.

In the process of selling 60P chiller products, many companies will float an interval in the reasonable range of quotations to cope with the normal cost increase and negotiation process. The company's profit has been maintained at a fixed interval. In this case, the purchasing company may have a reasonable judgment when it comes to the quotation, and reduce the procurement cost of the enterprise through certain negotiation means. The above factors affecting the price have a certain impact on the price of 60P freezers, but if the production is made in a reasonable profit range, it should be acceptable to the purchasing company. In order to prevent quality problems, companies should avoid buying products that are significantly lower than the market price, and learn more about the relevant parts and technical indicators at the time of purchase.

Wuxi Guanya (LNEYA) 60P freezer adopts single-machine self-cascading refrigeration technology, which has faster cooling speed and stable refrigeration effect. It is popular in the refrigeration equipment market and is one of the brand manufacturers selected by users.

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Tel：+86-0510-88585980