mainstream branch of piston refrigeration compressor. Compressor body and motor are sealed inside one shell, with both sealing performance and maintainability. It is the common model of freezer cold storage piston refrigeration compressor. xiteliduo Source factory of refrigeration has long produced semi-hermetic piston compressor for cold storage, providing standardized products and customized supporting schemes for cold storage engineering contractors worldwide, adapting to multiple projects of food freezing and low-temperature storage.
Product application characteristics: The motor cavity and cylinder of semi-hermetic refrigeration compressor are connected. Refrigerant can cool the motor, so heat dissipation performance is better than fully enclosed models under low-temperature working conditions. The equipment adopts removable end cap design. When valve plate and piston ring wear failure occurs, whole machine return to factory is unnecessary. Disassembly and maintenance can be finished on site, greatly shortening maintenance cycle. Models cover 2HP to 20HP, supporting R22 and R404A refrigerants. Low-temperature versions can bear high compression ratio steadily and adapt to -18℃ low-temperature freezing working conditions. The unit is equipped with multiple protection devices of high pressure, low pressure and overload. Electric control signals can be connected to cold storage PLC control system to remotely monitor operating pressure, exhaust temperature and oil temperature. Pressure holding leak detection and no-load test are completed before delivery to ensure no leakage risk on shell welds and flange positions. In parallel installation scenarios, oil balance pipelines can be matched to balance crankcase oil level of multiple compressors and prevent single-unit burning due to oil shortage. The base of equipment is equipped with mounting interfaces for shock absorption pads to restrain vibration transmission to refrigeration pipelines and reduce weld cracking risks.
Application fields & working scenarios: Semi-hermetic refrigeration compressors are mostly used in food freezer cold storage, seafood cold storage and quick-freezing cold storage, and also medium-sized preservation cold storage renovation projects. Meat freezer cold storage maintains long-term low-temperature environment of -18℃, which requires strong continuous output capacity of semi-hermetic piston compressor under low temperature. Besides low temperature, seafood cold storage has high air humidity around warehouse, so equipment in equipment room needs moisture-proof treatment. Small quick-freezing cold storage adopts 5HP~10HP semi-hermetic models. Large frozen storage projects can adopt multiple semi-hermetic piston units running in parallel. Many cold storage installation contractors prefer to purchase low-temperature semi-hermetic piston refrigeration compressor, balancing procurement cost and convenience of later maintenance. Cold storage refrigeration compressor manufacturers in Zhejiang undertake a large number of new-built and old cold storage renovation projects for local food factories. Local factories provide faster supply and on-site commissioning service response.
Engineering application case: A meat processing enterprise in Shengzhou, Zhejiang built an 800 ㎡ meat freezer cold storage. The target temperature is stably kept at -18℃ for long-term storage of frozen pork and mutton. Technical engineers of the project investigated which manufacturer provides good piston compressor for cold storage, comparing equipment parameters and cases of multiple suppliers. Finally, 15HP semi-hermetic piston refrigeration compressor provided by xiteliduo Source factory of refrigeration was selected with two-units parallel configuration and R404A refrigerant. During construction, technical staff of manufacturer provided guidance on pipeline oil return slope design to guarantee smooth lubricating oil backflow to crankcase and avoid liquid hammer risk. In system commissioning stage, suction superheat was stably maintained between 6K~10K, and exhaust temperature was controlled below 105℃. After formal operation of cold storage, even when the maximum ambient temperature of equipment room reaches nearly 38℃ in summer, the unit still runs stably, and temperature fluctuation inside cold storage is controlled within ±0.6℃. Operation and maintenance staff of the enterprise replace oil separation filter element every 4000 running hours and verify pressure safety valve regularly according to manufacturer’s operation manual. After 4 years of operation, only piston ring and valve plate were replaced once, without long-time shutdown causing cargo loss. In the early scheme comparison of the project, the screw machine with the same cooling capacity has higher procurement cost. This project has intermittent load, so semi-hermetic piston unit is more suitable.
Many B-side purchasers inquire about maintenance supporting for piston refrigeration compressor. The advantage of semi-hermetic models lies in strong universality of spare parts. Consumable parts including piston ring, valve plate and shaft seal are easy to stock. In old cold storage renovation projects, many old R22 units are replaced and upgraded. Semi-hermetic R404A piston compressors can be selected together with replacement of expansion valve and sealing components. xiteliduo Source factory of refrigeration supports OEM manufacturing demand of piston refrigeration compressor OEM manufacturer. Equipment anti-corrosion and interface specifications can be adjusted according to customers’ project working conditions for bulk supply to general contractors and foreign trade customers. Complete test reports and operation manuals are delivered together with equipment, with remote technical guidance to assist pressure test, vacuum operation and refrigerant filling of equipment room. In daily maintenance, crankcase oil level should be monitored. Crankcase heating belt needs to be activated in low-temperature winter environment to prevent refrigerant migration diluting refrigeration oil and avoid liquid hammer at startup.
Semi-hermetic Refrigeration Compressor Structural Features and Food Freezer Cold Storage Engineering Application Cases The semi-hermetic refrigeration compressor is a mainstream branch of piston refrigeration compressor. Compressor body and motor are sealed inside one shell, with both sealing performance and maintainability. It is the common model of freezer cold storage piston refrigeration compressor. xiteliduo Source factory of refrigeration has long produced semi-hermetic piston compressor for cold storage, providing standardized products and customized supporting schemes for cold storage engineering contractors worldwide, adapting to multiple projects of food freezing and low-temperature storage.
Product application characteristics: The motor cavity and cylinder of semi-hermetic refrigeration compressor are connected. Refrigerant can cool the motor, so heat dissipation performance is better than fully enclosed models under low-temperature working conditions. The equipment adopts removable end cap design. When valve plate and piston ring wear failure occurs, whole machine return to factory is unnecessary. Disassembly and maintenance can be finished on site, greatly shortening maintenance cycle. Models cover 2HP to 20HP, supporting R22 and R404A refrigerants. Low-temperature versions can bear high compression ratio steadily and adapt to -18℃ low-temperature freezing working conditions. The unit is equipped with multiple protection devices of high pressure, low pressure and overload. Electric control signals can be connected to cold storage PLC control system to remotely monitor operating pressure, exhaust temperature and oil temperature. Pressure holding leak detection and no-load test are completed before delivery to ensure no leakage risk on shell welds and flange positions. In parallel installation scenarios, oil balance pipelines can be matched to balance crankcase oil level of multiple compressors and prevent single-unit burning due to oil shortage. The base of equipment is equipped with mounting interfaces for shock absorption pads to restrain vibration transmission to refrigeration pipelines and reduce weld cracking risks.
Application fields & working scenarios: Semi-hermetic refrigeration compressors are mostly used in food freezer cold storage, seafood cold storage and quick-freezing cold storage, and also medium-sized preservation cold storage renovation projects. Meat freezer cold storage maintains long-term low-temperature environment of -18℃, which requires strong continuous output capacity of semi-hermetic piston compressor under low temperature. Besides low temperature, seafood cold storage has high air humidity around warehouse, so equipment in equipment room needs moisture-proof treatment. Small quick-freezing cold storage adopts 5HP~10HP semi-hermetic models. Large frozen storage projects can adopt multiple semi-hermetic piston units running in parallel. Many cold storage installation contractors prefer to purchase low-temperature semi-hermetic piston refrigeration compressor, balancing procurement cost and convenience of later maintenance. Cold storage refrigeration compressor manufacturers in Zhejiang undertake a large number of new-built and old cold storage renovation projects for local food factories. Local factories provide faster supply and on-site commissioning service response.
Engineering application case: A meat processing enterprise in Shengzhou, Zhejiang built an 800 ㎡ meat freezer cold storage. The target temperature is stably kept at -18℃ for long-term storage of frozen pork and mutton. Technical engineers of the project investigated which manufacturer provides good piston compressor for cold storage, comparing equipment parameters and cases of multiple suppliers. Finally, 15HP semi-hermetic piston refrigeration compressor provided by xiteliduo Source factory of refrigeration was selected with two-units parallel configuration and R404A refrigerant. During construction, technical staff of manufacturer provided guidance on pipeline oil return slope design to guarantee smooth lubricating oil backflow to crankcase and avoid liquid hammer risk. In system commissioning stage, suction superheat was stably maintained between 6K~10K, and exhaust temperature was controlled below 105℃. After formal operation of cold storage, even when the maximum ambient temperature of equipment room reaches nearly 38℃ in summer, the unit still runs stably, and temperature fluctuation inside cold storage is controlled within ±0.6℃. Operation and maintenance staff of the enterprise replace oil separation filter element every 4000 running hours and verify pressure safety valve regularly according to manufacturer’s operation manual. After 4 years of operation, only piston ring and valve plate were replaced once, without long-time shutdown causing cargo loss. In the early scheme comparison of the project, the screw machine with the same cooling capacity has higher procurement cost. This project has intermittent load, so semi-hermetic piston unit is more suitable.
Many B-side purchasers inquire about maintenance supporting for piston refrigeration compressor. The advantage of semi-hermetic models lies in strong universality of spare parts. Consumable parts including piston ring, valve plate and shaft seal are easy to stock. In old cold storage renovation projects, many old R22 units are replaced and upgraded. Semi-hermetic R404A piston compressors can be selected together with replacement of expansion valve and sealing components. xiteliduo Source factory of refrigeration supports OEM manufacturing demand of piston refrigeration compressor OEM manufacturer. Equipment anti-corrosion and interface specifications can be adjusted according to customers’ project working conditions for bulk supply to general contractors and foreign trade customers. Complete test reports and operation manuals are delivered together with equipment, with remote technical guidance to assist pressure test, vacuum operation and refrigerant filling of equipment room. In daily maintenance, crankcase oil level should be monitored. Crankcase heating belt needs to be activated in low-temperature winter environment to prevent refrigerant migration diluting refrigeration oil and avoid liquid hammer at startup.
