How to Debug the Expansion Valve of Low Temperature Freezer?

The effective operation of low temperature freezer is relevant to the needed refrigerating effect. It is crucial to correct expansion valve if better cooling effect is wanted. So, how to debug the expansion valve of low temperature freezer?

During the operation of low temperature freezer, the smaller the opening is, the less the volume of fluid transmission and pressure are,and vice versa. Based on the thermodynamic property of refrigerating fluid, the corresponding temperature varies as the pressure differs. The pressure raises, so does the temperature.

Therefore, if the pressure of the expansion valve of low temperature freezer is too small, the evaporating pressure and temperature will be too low. However, the speed of evaporation, volumetric refrigeration capacities and cooling efficiency will reduce because the flow of evaporator decreases and the pressure declines.

Conversely, the outlet of the expansion valve of low temperature freezer has excess process pressure, the evaporating pressure and temperature will also be too high. And the flow and pressure entering the evaporator of low temperature freezer rise. The compressor functions abnormally because damp gas (even the liquid) caused by excessive liquid evaporation is absorbed by compressor to produce wet stroke, bring about a series of severe conditions and even the damage o compressor. So with that being said, the opening level of the expansion valve of low temperature freezer should be regulated according to the temperature of the low temperature freezer of the day, which means as per related pressure.

The inlet pressure of low temperature freezer goes with higher evaporating pressure generally due to the pressure loss of air suction pipe and degree of superheat ( it depends on the length of pipeline and thermal barrier effect). At that time, the regulate pressure should be similar to the evaporation pressure ( the latter one will be a little higher). The regulation of the expansion valve of low temperature freezer should proceed carefully and patiently. The modulating pressure must pass the ebullition of heat exchange produced by the evaporator and the temperature of low temperature freezer before going into the intake cavity of compressor through pipelines to reflect on the pressure gauge, which takes time.

Guanya Refrigeration Technology Co., Ltd in Wuxi reminds that it takes 10 to 15 minutes every time for the regulation of the expansion valve of low temperature freezer to stabilize the pressure on the inlet pressure gauge. It should act with undue haste. The inlet pressure is a major parameter-basis for the compressor of low temperature freezer. The technical characteristics of the expansion valve of low temperature freezer influence the normal regulating operation straightway.

It is essential to tackle in time when faults like blocking and ice block happen in case that they affect the use of low temperature freezer. The low temperature freezer price from LNEYA is really reasonable. Come and contact us.

Daily Maintenance of Low Temperature Freezer

Low temperature freezer, which is also called industrial refrigerator, is mainly used for industrial cold treatment, the increase of wear-resisting property and friction of metals. Guanya Refrigeration Technology Co., Ltd in Wuxi is a leading role in the national Low Temperature Freezer Ranking List and its professionals make a conclusion about the related routine maintenance particularly. Also low temperature freezer price is the keypoint of its quality.

Every specialist is responsible for corresponding low temperature freezer in the industry, thus other personnel without the permission of operators will be not allowed to use the equipment. To ensure the time of duration for opening of low temperature freezer should not be over 5 minutes with more than 20-minute interval. It is suggest from Low Temperature Freezer Ranking List that a detailed record ought to be done about the opening and closing time as well as the exceptional situations. When abnormal conditions occur, equipment control sections should be reported with a record.

Low temperature freezer applies the artificial method for frost removal, and automatic cycle of freezing and thawing will degrade the biological samples. If the low temperature freezer of LNEYA in Wuxi of Low-Temperature Ranking Freezer List has worked for 24 months, it has to be killing frost once. Of course, the manager can decide whether the time should be earlier or not according to the physical truth, but every 24-month interval should be carried on at most. Before defrosting, enough dry ice ought to be prepared well. When the samples are taken out from freezer, they should be put into dry ice quickly and covered with a certain number of them. Then, a next step is to transfer them to the storage device in reserve.

Low Temperature Freezer Ranking List advises that the power supply of freezer should be turned off when all samples are settled down and open the door of freezer so as to melt the frosted ice gradually. It is banned to use metal tools to remove rime ice of in wall of freezer forcibly in case of the damage to the box. After the rime ice melt completely, to use a clean duster cloth to dry the residual moisture content inside, then to open the door for 1 to 2 hours, finally to close the door and power up.

After the completion of low temperature freezer and before the restocking of samples, the low temperature freezer should operate above 16 hours in order that the in-wall temperature of box can be down to target temperature and reach equilibrium states. After the defrosting finishes, the samples will be transferred back to the equipment based on the original storage location.

Numerous brands are in the Low Temperature Freezer Ranking List, which is important for buyers to be cautious. Generally, all of them can lengthen the service life of wear-out part directly, generally apply for thermal contraction of copper bush and bearing , and extensively use for sophisticated mechanized equipment .

The Introductions of the Ultra Low Temperature Recirculating Chillers

The performances of ultra low temperature recirculating chillers are different because of their different compressors. Compared with piston compressor, the structure of screw-type compressor tends to be more precise, so when users need to select ultra low temperature recirculating chillers, they should understand the cooling operation.

When working, the ultra low temperature recirculating chillers’ screw-type compressor will spray lubricant into the working chamber, functioning as lubrication, cooling, sealing, soundproofing, lubricating for main bearing , thrust bearing and shaft seal, a push for pressure oil of oil piston and balance piston. These oils will mix with high pressure gas to be expelled from compressor.  

Suction strainer: the ultra low temperature recirculating chillers’ suction strainer is comprised of shell and metal filter mesh. The shell is installed with suction thermometer, pressure gauge and priming valve, among which priming valve is the oil position for unit operation that needs paying attention to.

Oil cooler: the lubricating oil isolated from the engine oil of ultra low temperature recirculating chiller leads to the temperature rising ( close to exhaust heat temperature) for it absorbs friction heat and the heat of air. The oil temperature is so high that viscosity decreases, weakening the sealing function, increasing internal leakage and lowering the efficiency of compressor. Thus, it is necessary for lubricant to go through cooling for purpose of reuse. The oil cooler of ultra low temperature recirculating chiller is definitely for cooing the oil.

Coarse oil filter: in order to ensure the working of oil pump of ultra low temperature recirculating chillers, the lubricating oil should be purified through coarse oil filter before entering the oil pump.The later cleanliness of coarse oil filter should be checked for the first operation of the machines. And overhauling the filter mesh regularly should be on the basis of the system cleanliness. Gas or kerosene can be applied to clean the filter mesh, and get them clean with dry air for continuous use.

Oil- pressure adjusting valve: the ultra low temperature recirculating chillers’ oil-pressure adjusting valve is to regulate the injection pressure of compressor. If the ingoing oil pressure of compressor is excessive, the fuel-injection quantity will be overmuch, not only influencing the air removal of compressor but wasting work of it as well as increasing the possibility of shaft tunnel oil leakage of ultra low temperature recirculating chillers. Otherwise, the fuel-injection quantity will be too small, degrading the function of lubricant.

Oil separator: the oil separator of ultra low temperature recirculating chillers’ compressor unit is divided into vertical type and horizontal type. The interior of oil contains three chambers. The one next to the staving of compressor is for keeping the oil level, whose external shell is placed two sight glasses at top and bottom to observe the height of oil (automatic unit has oil level controller). That near the staving of electrical machinery is for installing the highly efficient filter element to separate the quadric oil, whose outboard also has a sight glass so as to decide whether to return oil or not based on the oil level.

The ultra low temperature recirculating chillers'screw-type compressor is quite complicated, thus it is good to have some relevant knowledge of its cooling and accessories when buying.

Leakage Detection Tips of Low Temperature Freezer

Pressure leaking detection

It is an effective way to check and find out the leakage point. The leakage detecting pressure of refrigerating system of freezer is relevant to the type of refrigerating fluid and cooling and the location of tube. The leakage detecting pressure of high-pressure system is 1.25 times greater than designing condensing pressure, while that of the low-pressure system is near 1.2 times higher than saturation pressure in condition of the temperature in summer. With it, refrigerating plant can stop from leakage no matter it is working or parking. Some cooling system should be detected according to the provisions of the pressure if there is a predefined acceptance or leakage detection standard. Obviously, the leakage detecting pressure can not be raised casually, otherwise it is likely to destroy the equipment, resulting in an accident.

Bubble test

It is a widely used detecting method at present , especially for those medium and large freezer systems that take advantage of it to search for the leak point. Generally, bubble test is comprised of soap or soap powder. The solution of soapy water should not be too ropy; if not, the viscosity will be too big to flow, worsening the sensitiveness of the test. But as an editor of Whose Low Temperature Freezer Is Best，i would like to tell you that the modulation not ought to be too dilute, or else the fluidity will be too large to be adhere to the surface of the equipment, being hard to form the bubbles. The soapy water can be applied the leaky point with hairbrush directly to observe whether this position is blistering. When it comes to the positions that are difficult to observe straightway, mirror reflection and flashlight can be used. After the test, the soapy water should be dried up in case of corrosion.

LNEYA have more freezers for sale and low temperature freezer price is really affordable.

Suitable Freezer Manufacturer

For enterprise users, choosing a suitable freezer manufacturer is very important and must be carefully treated. Wuxi Guanya Refrigeration technology co., Ltd, as a professional freezer manufacturer, is committed to producing all kinds of low temperature and ultra low-temperature refrigeration equipment, innovating, researching and developing continuously to meet the needs of the public. Cold plate freezer for sale now!

The professional freezer manufacturer has a team of high-quality professional designers with rich experience in the development of ultra-low temperature and high temperature. It takes the market and user needs as the guidance, takes science and technology as the center, applies international advanced technology, constantly brings forth something new from the old, follows the pace of the market, and meets the market demand.

Professional freezer manufacturers have great strength, LNEYA has one-step production chains, it strictly conforms to ISO9001-2008 international quality certification requirements standardized management from the product design, the component purchase, the screening, the production process to the packaging transportation, striving for product excellence, reasonable price, and satisfactory service.

Wuxi freezer manufacturer, LNEYA, according to the national conditions, researches and develops and produces cold plate freezer for sale of various specifications that adapts to the characteristics of domestic users and environment. The performance characteristics of LNEYA freezers are in an advanced position in China, their rigid indexes are basically synchronized with the international standard. Besides, the product also has a unique style and high-cost performance.

1. Electronic lock function. The door only opens when the password is authorized, the equipment can allocate 6 sets of authorization, each set has an independent password and username, the freezer manufacturer ensures that the open-door personnel and the open-door time can be recorded every time.

2. It adopts automatic control technology, high precision computer temperature control system, and PT-100 temperature sensor. The body temperature can be set freely within the range of -20 ℃ to -150℃. Equipped with mechanical lock holes, high and low voltage protection and high and low voltage displays, the running state is clear at a glance.

3. Equipped with a variety of fault alarm, over-temperature alarm, sensor alarm, high voltage alarm, compressor overheating alarm and open delay protection, all parts can be grounded safely, which makes the operation more safe and reliable.

4. The products have excellent performances, complete varieties, reasonable price and a one-year warranty, they can be customized according to customer needs. We have 24-hour service guarantee system, and welcome your negotiation.

Professional freezer manufacturers must have the strength to guarantee, and only the freezer manufacturers of great strength can provide a more comprehensive and complete service system.

Tips for Leakage Detection of Low Temperature Freezer

Soaking leakage detection

The sensibility of soaking leakage detection is higher than bubble test,which is usually applied for small Freon freezer unit. When using it, the equipment prohibited from contacting water in the system should be discharged, like all kinds of relays and electrical control device. Taking advantage of warm water during the bubble test, because its surface tension is smaller than cold water, forming bubbles more easily. As an editor of Low Temperature Freezer, I want to tell you that the leakage point will be discovered simply if accompanied by intense light source. After the completion of soaking leakage detection, the surface ought to be dried with compressed air, preventing the metal from corrosion.

Halide torch and its leakage detection

These are the specialized devices for detecting the Freon freezer unit system. When Freon refrigerating fluid encounters hot cooper parts, different colored flames will be casted for F2, C12 and Br contain the elements of halogen, helping find out the leaking point.

Vacuum leak test

When freezer unit system passes the pressure leakage detection, it should also go through the vacuum leak test since some pasts exist one-way leaker. Only pressure and vacuum leakage detection both conform to the standard can the leakproofness of cooling system can be ensured. Besides, the system is evacuated, so can water at the same time , esped dcially the Freon system. Therefore, evacuation and desiccation play essential roles in debugging the unit.

Should the uses for low temperature freezer be understood, the users will have a better try! Visit LNEYA to know more about low temperature freezer price.

Maintenance of Top 10 Industrial Freezers

When we choose and buy industrial freezers of top 10 brands, in addition to some necessary needs, we should also pay attention to the use and maintenance of the industrial freezer, we should select industrial freezers with long service life, high safety, and high efficiency.

In order to bring correct maintenance of the top 10 industrial freezers to the enterprises, LNEYA, an enterprise has many-year experience in industrial freezer refrigeration, summarizes a number of characteristics of cold plate freezer for sale and puts forward a series of maintenance standards.

Of course, the operating environment of top 10 industrial freezers is very important, to keep the exterior of the industrial freezer clean and ventilated, we should keep the industrial freezer being placed stably and horizontally, with no sundries around.

Industrial freezers are recommended to be maintained by a professional staff, setting a certain password in the operating interface to avoid unnecessary effects caused by the wrong operation of irrelevant personnel. In the daily maintenance, the anti-ash nets of the top 10 industrial freezers are recommended to be cleaned up every month so as to maintain good refrigeration effect and longtime low-temperature effect. Because the air-cooled condenser of the industrial freezer is more easily stained with a certain ash layer, regular cleaning is very important.

In the use of top 10 industrial freezers, as far as possible to reduce the frequency of door opening, take out the needed stuff as soon as possible. If the icy inside the industrial freezer is a lot, try not to use the sharp objects to eliminate the icy.

The top 10 industrial freezers cannot be used as a quick-freeze freezer, try not to place normal temperature items exceeding 1/4 the volume of the industrial freezer, if the things need to be placed are a lot, try to place them in accordance with the batch, thus achieving the cooling effect.

Wuxi Guanya Refrigeration technology co., Ltd is a reliable chiller manufacturer, offering cold plate freezer for sale with different types.