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Screw freezer

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Screw chiller and low temperature chiller are special chiller designed for special low temperature environment. Its super cooling capacity is for food preservation in hotels, restaurants, supermarkets and other commercial places, large cold storage meat, seafood freezing, refrigeration, In the field of ice making, food processing freezing / refrigeration, pharmaceutical, chemical and other low temperature environments provide reliable protection.

  

1. Complete product range, including three series: high temperature (water temperature -5 ℃), medium temperature (water temperature -10 ℃), low temperature (water temperature -15 ℃).

  

2. The structure is highly optimized. The heat exchanger plate is used to support the body. The structure is simple, compact and practical.

  

3. The perfect combination of screw compressor + energy heat exchanger, the energy efficiency ratio is as high as 4.5.

  

4. Four-stage or stepless capacity control to match load changes.

  

The water-cooled chiller is small in size and large in cooling capacity. It adopts imported compressors from the world, low-temperature performance, reliable and durable. The product is designed according to industrial application characteristics. It has a built-in low-temperature circulating water pump and stainless steel freezing water tank. Anti-corrosive material is used to effectively prevent rust and corrosion. The microcomputer LED quantity controller has temperature display, set temperature, automatic adjustment of frozen water temperature and compressor delay protection. It uses electrical components such as contactors and relays, and is fully equipped. The indicators, switches, and operations are clear at a glance. The built-in electronic water level indicator and alarm device automatically alarms when the water level is low. The operator can grasp the water level of the freezing water tank through the control panel and replenish water in time. The unique modular design of each compressor The system is safe and independent, and even if there is a problem in one system, it will not affect the normal work of other systems.


1 working system principle

Single-stage refrigeration cycle system

Single-stage refrigerator is a relatively widely used type of refrigerator, which can be used in ice making, air conditioning, food refrigeration, and industrial production processes. Single-stage refrigeration cycle means that the refrigerant in the refrigeration system successively undergoes four processes of compression, condensation, throttling, and evaporation to complete the cycle of the single-stage refrigerator, that is, the purpose of refrigeration is achieved. The refrigeration system consists of an evaporator, a single-stage compressor, an oil separator, a condenser, an ammonia reservoir, an ammonia liquid separator, a throttle valve and other ancillary equipment. They are connected to each other through pipes to form a closed system. Among them, the evaporator is a device that transports cold energy. After the liquid refrigerant evaporates, it absorbs the heat of the object to be cooled. The compressor is the heart of the system, which plays the role of sucking, compressing, and transmitting the refrigerant vapor. The oil separator is used for sedimentation. Separate the oil in the compressed refrigerant vapor; the condenser condenses the high-temperature refrigerant vapor discharged from the compressor into a saturated liquid; the ammonia reservoir is used to store the ammonia liquid of the refrigerant condensed in the condenser, and adjusts between the condenser and the evaporator Supply and demand relationship of refrigerant ammonia liquid; ammonia liquid separator is an important auxiliary equipment in ammonia gravity liquid supply system; throttle valve plays a role of throttling and reducing the pressure of the refrigerant while controlling and adjusting the flow of refrigerant liquid flowing into the evaporator. The system is divided into two parts: high-pressure side and low-pressure side.

Two-stage refrigeration cycle system

The two-stage refrigeration cycle is developed on the basis of a single-stage refrigeration cycle. Its compression process is carried out in two stages. The refrigerant vapor from the evaporator first enters the low-pressure cylinder to be compressed to intermediate pressure, and then enters high pressure after intermediate cooling. Stage cylinder, compressed to condensing pressure and entering the condenser. Generally, when the evaporation temperature is -25 ℃ ~ -50 ℃, a two-stage compressor should be used for refrigeration. The refrigeration system consists of an evaporator, a two-stage compressor, an oil separator, a condenser, an intercooler, an ammonia reservoir, an ammonia liquid separator, a throttle valve and other ancillary equipment. They are connected by pipes to form a closed system. . Among them, the intercooler uses a small amount of liquid refrigerant to vaporize and absorb heat at intermediate pressure, so that the superheated steam discharged from the low-pressure stage is cooled, the intake temperature of the high-pressure stage is reduced, and the high-pressure liquid refrigerant is also cooled.

Evaporative condenser operation principle

The high-temperature gaseous refrigerant entering the condensing coil is sprayed with water and air through the wall of the coil to exchange heat with the outside of the coil. The temperature of the refrigerant gas decreases with the length of time in the tube, and gradually changes from gaseous to liquid. The fan uses super strong wind to make the spray water fully cover the outer surface of the coil, thereby improving the heat exchange efficiency. After spraying water and air absorbing the heat from the coil wall, the temperature rises, and some of the water changes from liquid to gas, taking away a lot of heat from the pipe wall. The moisture in the hot and humid air is intercepted by the baffle and introduced into the PVC heat exchange layer. , Hot air is discharged. The water in the PVC heat exchange layer is cooled by the fresh air flowing through it, the temperature is reduced, flows into the water collecting tank, and then is pumped into the spray system by the water pump to continue the circulation. The water lost to the air is automatically adjusted and replenished by the water level control device.

Evaporator cold suspect operating principle

2 screw freezer

Low-temperature chiller is a special chiller designed for special low-temperature environments. Its super cooling capacity is used for food preservation in hotels, restaurants, supermarkets and other commercial places, large-scale cold storage meat, seafood rapid freezing, refrigeration, ice-making fields, Food processing freezing / refrigeration, pharmaceutical, chemical and other low temperature environments provide reliable protection.

1. Complete product range, including three series: high temperature (water temperature -5 ℃), medium temperature (water temperature -10 ℃), low temperature (water temperature -15 ℃).

2. The structure is highly optimized. The heat exchanger plate is used to support the body. The structure is simple, compact and practical.

3. The perfect combination of screw compressor + energy heat exchanger, the energy efficiency ratio is as high as 4.5.

4. Four-stage or stepless capacity control to match load changes.

The water-cooled chiller is small in size and large in cooling capacity. It adopts imported compressors from the world, low-temperature performance, reliable and durable. The product is designed according to industrial application characteristics. It has a built-in low-temperature circulating water pump and stainless steel freezing water tank. It is extremely easy to use. Anti-corrosive material is used to effectively prevent rust and corrosion. The microcomputer LED quantity controller has temperature display, set temperature, automatic adjustment of frozen water temperature and compressor delay protection. It uses electrical components such as contactors and relays, and is fully equipped. The indicators, switches, and operations are clear at a glance. The built-in electronic water level indicator and alarm device automatically alarms when the water level is low. The operator can grasp the water level of the freezing water tank through the control panel and replenish the water in time. The unique modular design of each compressor The system is safe and independent, and even if there is a problem in one system, it will not affect the normal work of other systems.

3 air-cooled screw chiller

1. The air-cooled condenser is fin type, adopts double oil ripple hydrophilic aluminum platinum, and is manufactured by professional heat exchanger processing equipment. It has the advantages of compact structure, small size, light weight, and high heat exchange efficiency. Low speed large leaf axial fan can effectively reduce the operating noise and reduce the impact on the surrounding environment.

2. The unit control system adopts imported PLC program controller, and the human-machine world is equipped with a large screen touch screen. The interface is simple and elegant, and the operation is intuitive and simple.

3. The unit has reliable safety protection devices, including: high and low voltage protector, exhaust overheat protector, compressor motor overheat protector, overload current protector, antifreeze temperature protector, water flow protector, emergency stop switch, temperature sensing Fusible plugs, safety valves, etc.

Air-cooled heat pump unit

1. Energy saving, the comprehensive energy efficiency ratio is as high as 8.0, which can provide cooling, heating, and domestic hot water operating conditions according to the ambient temperature and hot water demand, fully automatic switching, making full use of energy.

2. Invest in profits and recover the cold quantity when making hot water, which can achieve zero refrigeration cost.

3. Safety and environmental protection, using refrigerant as the medium, non-toxic, non-explosive, can be connected to the original hot water system, can also replace the high-risk, high-cost boiler system, can also be used in conjunction with solar energy systems, replacing the electric heating part.

4. Fully automatic computer control, no special person monitoring required, can be operated through remote or centralized management system.

5. Unit type or modular type, assembled structure, slim size, can be flexibly installed on the roof, terrace or machine room.

6. The cold air discharged during hot water production can be used to reduce the ambient temperature and improve the environmental quality.

Water-cooled screw unit

1.Water-cooled screw machine adopts horizontal shell-and-tube condenser and shell-and-tube evaporator. It has the characteristics of simple structure, stable heat exchange, long-lasting efficiency, and convenient maintenance. composition.

2. The unit control system adopts imported PLC program controller, and the man-machine interface is equipped with a large screen touch screen. The interface is simple and elegant, and the operation is intuitive and simple.

3. The unit has reliable safety protection devices, including: high and low voltage protector, exhaust overheat protector, compressor motor overheat protector, overload current protector, antifreeze temperature protector, water flow protector, emergency stop switch, temperature sensing Fusible plugs, safety valves, etc.

References

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