The method of preventing the refrigeration compressor of the cold storage room from reversing　    Reverse rotation is strictly prohibited after the refrigeration compressor of the cold storage room is stopped. When the compressor rotor is stationary, there is still a large volume of process gas remaining in the pipeline and has a certain pressure, and the compressor rotor stops rotating at this time, and the pressure in the compressor is lower than the pipeline pressure. At this time, if there is no check valve installed on the compressor outlet pipe or if the check valve is far away from the compressor outlet, the gas in the pipe will flow backward, causing the compressor to reverse, and it will also drive the steam turbine or electric motor and gear transmission. Wait for the rotor to reverse. The reverse rotation of the compressor unit rotor will destroy the normal lubrication of the bearing, change the force of the thrust bearing, and even cause the loss of the thrust bearing. The dry gas seal will also be damaged due to the reverse rotation of the compressor.　    In order to prevent the compressor of cold storage room from reversing, several issues should be paid attention to:       1. A check valve must be installed on the compressor outlet pipeline and installed as close to the outlet flange as possible, so that the distance between the check valve and the compressor outlet is minimized, so that the gas capacity in this section of the pipeline is reduced to Minimal, will not cause reversal.　　2. According to the conditions of each unit, install vent valves, exhaust valves or recirculation pipelines. When shutting down, open these valves in time to remove high-pressure gas from the compressor outlet to reduce the gas capacity stored in the pipeline.　　3. The gas in the system may backflow when the compressor is stopped. High-pressure and high-temperature gas backflow into the compressor can not only cause the compressor to reverse, but also burn out the bearings and seals.　　 Due to the fact that there are many accidents caused by gas backflow in China, it is very noteworthy! In order to effectively prevent the occurrence of the above accidents, the following two tasks must be done before speed reduction and shutdown:　　1. Open the vent valve or return valve to vent or return the gas.　　2. Close the check valve of the system pipeline firmly. After completing the above work, gradually reduce the speed and shut down.　　3. Increase research work. Due to the reform of the current wall materials, the design of a huge number of mixed structures has many new problems to study in wide construction. The increasingly complex functions of high-rise buildings need to be adjusted and supplemented continuously. In addition, some new issues need to be studied.

At this year’s National People’s Congress and The Chinese People’s Political Consultative Conference, food safety has once again come to the fore. General Secretary XI Jinping once again stressed the importance of food safety to people’s live livelihood and society. The cold chain logistics of food carries all the checkpoint processes before the food is consumed. How to ensure the food is always processed and stored safety in the prescribed low temperature aseptic environment has become a problem worth thinking about.As the source of the whole cold chain logistics, food processing has a direct impact on the quality of food. If there is no sterilizing link at the source, the products carrying bacteria and viruses will be directly delivered to consumers, which will easily pose a threat to consumers’ health and safety, and the reputation and image of the products will also be affected.In addition, food disorderly processing phenomenon cluster. In many processing workshops, the environment does not meet national or international standards. Food is not only exposed to dirty and disordered environment, but also exposed to substandard disinfection and the hands of workshop workers who do not wear hats, masks and protective clothing. So, the cleanliness and freshness of food cannot be guaranteed.There are many factors affecting the quality of food processing, among which the most important one is the food processing workshop. In some industries, food processing workshop have a significant impact on the quality of food, especially the primary processing of fruits and vegetables, slaughtering of livestock and poultry, processing of aquatic products, etc., all of which put forward higher requirements for processing workshops.In view of the statues food processing industry, Guangzhou Icesource Co., Ltd took the lead in creatively putting forward the concept of LCCP. LCCP is an advanced concept dedicated to improving food quality, ensuring food safety, and caring for employees from the source of food cold chain logistics, namely, food processing.What exactly is an LCCP?LCCP is a Low temperature clean and comfortable plant for cold storage room.L-Low temperature- balance safety and efficientThe low temperature environment takes into account both food preservation and worker efficiency. The food industry requires the ambient temperature below 12℃. If the temperature is below 5℃, workers need thicker clothes to keep warm and the temperature is low, so the working efficiency will be reduced. If the temperature is higher than 15℃, food freshness is difficult to ensure.C-Clean-ensure food hygiene and safetyGoods, people and workshops are separated, and multiple measures are taken to ensure cleanliness and hygiene. Air curtain machine reduces the impact of incoming and outgoing cargo on workshop cleanliness. Changing room, washing room, air shower room from the source to eliminate bacteria and so on. Ozone disinfection, ultraviolet lamp disinfection, stainless steel drain tank, fresh air filtration system can filter dust in the outside air, ensure clean indoor air, cleaning and disinfection after the operation to reduce the breeding of bacteria.C-Comfortable-people-oriented, improve efficiencyWith advanced fresh air system, the outside air can be cooled, dehumidified, filtered and purified to control the CO2 content, ensuring fresh air, comfortable breathing and efficient working of workers. Double outlet air cooler, quiet (noise 40 dB below), moderate wind speed, soft air disturbance, like high-grade air conditioning, to workers feel comfortable.P- Comply with CMP construction requirementThe plant shall strictly comply with the requirements related to food production, especially the GMP certification for workshop design and layout, so as to minimize the risk of errors and facilitate cleaning and maintenance. Strict functional zoning, reasonable process layout, reduce the risk of food contamination, at the same time equipped with temperature, humidity, oxygen, carbon dioxide and other automatic monitoring equipment.Guangzhou Icesource Co., Ltd is not only the first to put forward the concept of LCCP, and its ice source refrigeration subsidiary has successfully applied this concept to the cold storage project. Icesource helped Qian Dama agricultural products Co., Ltd, Guangdong He’s aquatic products Co., Ltd and NO.1 food Co., Ltd. Establish LCCP concept cold storage successively.                          Guangzhou Icesource is not satisfied with the existing cold storage project construction. In the future, Icesource will make more efforts to extend the concept of LCCP to more logistics links of food cold chain, so as to create a complete and safe environment for food cold chain logistics. On the basis of ensuring the integrity of the cold chain, food safety should be improved to make the greatest contribution to the improvement of people’s living standards. 

Some customers ask how the cold storage room can be maintained to make the service life of the cold storage longer? In fact, simple maintenance and maintenance can be carried out by yourself, but some regular and technical maintenance and maintenance require professional refrigeration technicians to do. So how often do some routine maintenance and maintenance work? What aspects should be maintained and maintained?1. Routine inspection and maintenance scope every 700 hours　　Compressor oil level check and add    　　 Compressor current check　　 Refrigerant pressure check and addition　　 Cold storage lighting condition inspection　　 Cold storage insulation status inspection　　 Cold storage door inspection　　 Cold storage control loop working condition inspection2. Routine inspection and maintenance scope every 5000 hours　　Condenser cleaning　　 Fan noise detection　　 Refrigerant supplement　　 Dry filter replacement filter element　　The slab support is firm　　 electric heating tube correction　　Outer machine bracket paint　　 cold storage daily maintenance　　Insulation part: the library board avoids damage, scratches, dents, and corrosion　　 Sealing protection: timely remedy the part of the seal failure to prevent cold escape　　Refrigeration system: check the status of fans and compressors, and deal with and repair them in time　　Electrical part: check whether the temperature control system data is accurate at any time, etc.　　 cold storage room is a kind of low-temperature freezing equipment, mainly used for constant temperature storage of food, dairy products, meat, aquatic products, poultry, fruits and vegetables, cold drinks, flowers, green plants, chemical raw materials, etc. Because it is used very frequently in daily life, it is necessary to pay attention to its maintenance and maintenance to extend its service life.　　The cold storage room is installed or used again after being out of service for a long time, and the cooling rate should be reasonable: it is advisable to control it at 8-10℃ every day, and keep it at 0℃ for a period of time.　　 Cold storage storage board maintenance, pay attention to the collision and scratches of hard objects on the storage body during use. Because it can cause depression and corrosion of the library board, it will seriously reduce the local insulation performance of the library body.　　 Cold storage sealing part maintenance, because the fabricated cold storage is made up of several insulation boards, there are certain gaps between the boards. These gaps will be sealed with sealant during construction to prevent air and moisture from entering. Therefore, in use, repair some parts where the seal fails in time.　　 Cold storage floor maintenance. Generally, the floor of a small assembled cold storage uses insulation boards. When using the cold storage, you should prevent a large amount of ice and water on the ground. If there is ice, you must not use hard objects to beat during cleaning to prevent damage to the ground.         

There are three types of mildew removal methods for cold storage room: mechanical removal, physical removal and chemical removal.　　 (1) Mechanical mold removal method　　 is the part that performs cleaning and eradication of mold. It is also combined with other mold removal methods. There is an air washing method in the mechanical mold removal method, which is to install a water sprayer at the air inlet, and the air is circulated through the water to wash the mold spores. This method is like the current wet air cooler. , Can play a role in reducing mold.　　 (2) physical mold removal method of cold storage room　　 is the use of temperature, humidity, ultraviolet light, high frequency electricity and copper wire mesh filter to remove mildew. The temperature for mold growth is generally between -6°C and 40°C. For this reason, mold growth is rarely seen in low-temperature storage. Hot alkaline water can also be used to kill mold on tools and equipment. The growth of mold is closely related to temperature, so temperature control can only be used appropriately.　　Using ultraviolet light to remove mildew is a better method. It can sterilize, remove mildew, and also has some deodorizing effects. But this can only work on the directly irradiated part. Generally, 0.33 to 3 watts of ultraviolet radiation per cubic meter can be used to kill microorganisms when irradiated on an area of 2 meters away for 6 hours. But the effect of ultraviolet light is affected by temperature and humidity. The closer to the normal temperature of microbial growth, the higher the humidity, the stronger the ability to sterilize and remove mildew. Ultraviolet light can promote the oxidation of fat, so be careful when using it. The copper wire mesh filter is equipped with a copper wire mesh at the upwind, which can kill some molds.