6327results about "Compression machines with non-reversible cycle" patented technology

A screw compressor and a variable capacity bypass valve therefor are provided. The variable capacity bypass valve includes a bore formed in a rotor bore discharge face of the compressor housing upstream of a compression chamber outlet end of the compression chamber, a slide valve member inserted into the bore to fill a cavity, the valve member having a sealing surface configured to interact with a thread of a compressor screw during operation of the screw compressor, an actuator structure coupled to the valve member and oriented to move the valve member radially along the bore to open a fluid pathway communicatively coupling the compressor chamber to a bypass chamber configured to return compressed fluid to a fluid inlet of the compression chamber.

Disclosed is a screw compressor (100), comprising a screw compressor housing (101), a discharge cavity (113), at least one silencing channel, and at least one adjustment piston, wherein the discharge cavity (113) is defined by at least one part of the screw compressor housing (101); the at least one part of the screw compressor housing (101) defining the discharge cavity (113) forms a wall of the discharge cavity (113); at least one hole is provided in the wall of the discharge cavity (113); the at least one adjustment piston can be inserted into the at least one hole and move therein; the at least one silencing channel is formed by the at least one hole and the at least one adjustment piston, and the at least one silencing channel is in fluid communication with the discharge cavity (113); and the position of the at least one adjustment piston in the at least one hole determines the silencing length of the at least one silencing channel.

The invention provides a magnetic suspension centrifugal water chilling unit, and belongs to the field of refrigeration equipment. The magnetic suspension centrifugal water chilling unit comprises a magnetic suspension compressor, a condenser and an evaporator, the magnetic suspension compressor is connected with the condenser through an exhaust pipeline, and the condenser is connected with the magnetic suspension compressor and the evaporator through a liquid supply pipeline assembly; the system further comprises a natural process control module, the natural process control module is used for dynamically adjusting the starting sequence of a plurality of magnetic suspension compressors in the water chilling unit by determining the energy efficiency health index of the water chilling unit and calculating the energy efficiency health index, and the natural process control module is electrically connected with the central controller. And a natural process control module is arranged, a multi-dimensional energy efficiency health index model is constructed, and the starting sequence of the compressors is dynamically adjusted by integrating the actual energy efficiency ratio, the evaporation efficiency, the compressor aging coefficient, the pressure fluctuation and the environment humidity correction term.

The invention discloses an ocean temperature difference coupled offshore constant-pressure compressed carbon dioxide energy storage system and method, and relates to the technical field of compressed gas energy storage. The system comprises a working medium constant-pressure storage device, a carbon dioxide energy storage circulation loop, a carbon dioxide energy release circulation loop and a heat storage circulation loop. Gaseous carbon dioxide is condensed into a liquid state by utilizing deep sea low-temperature seawater in an energy storage stage, liquid carbon dioxide is evaporated into a gaseous state by utilizing shallow sea high-temperature seawater in an energy release stage, and gas-liquid conversion of carbon dioxide is realized by fully utilizing ocean new energy and ocean temperature difference; the flexible working medium constant-pressure storage device is used for storing low-pressure gaseous carbon dioxide and high-pressure liquid carbon dioxide, the constant pressure of the working medium constant-pressure storage device in the charging and discharging process can be guaranteed, and efficient and stable operation of the system is achieved. Efficient liquefaction and high-density storage of high-pressure carbon dioxide are achieved through the ocean temperature difference and seawater static pressure, the efficiency and energy density of the energy storage system are improved, and deep development of offshore resources is achieved.

A dishwasher (1) with at least one heat pump (14) comprising at least one compressor (16), one condenser (18), one expansion element (19) and one evaporator (20), which are interconnected via conduit sections for conveying a working medium (17) which changes state of matter during operation, is designed such that the heat pump (14) is mounted, filled with working medium (17) and can be tested for function or has been tested before installation in the dishwasher (1).

The invention relates to a heat-pump arrangement (14) for a dishwasher (1), to which heat-pump arrangement a heat-transfer device (WT) is assigned in which rinsing fluid (24) to be heated flows through at least one pipe portion (28) and is guided outwards to the inner wall (28a) of the pipe portion (28) by a guide means (29). The pipe portion is in heat-exchanging contact with the condenser (18) of the heat-pump arrangement. The working medium (17) of the heat-pump arrangement flows helically around the outside of the pipe portion (28) as an external medium.

The invention relates to the technical field of extremely-low-temperature refrigeration equipment, and provides an annular heat exchange unit which comprises a flow channel box, and the two ends of the flow channel box are covered with an upper cover body and a lower cover body correspondingly; a cavity partition plate is arranged in the runner box to form an upper heat exchange cavity and a lower heat exchange cavity; two upper runners which are not communicated with each other are arranged in the upper heat exchange chamber; two lower runners which are not communicated with each other are arranged in the lower heat exchange chamber; the adjacent flow channel partition plates in the two cavities are arranged in a staggered mode to form a transition flow channel. The annular heat exchange unit further comprises two circulating pipe sets. Therefore, the two heat exchange channels which are not communicated with each other and are arranged up and down are formed in the runner box; media in the two heat exchange channels do not make contact with each other, and heat exchange is achieved through the flow channel partition plate in the flowing process. On the premise that the overall size of the runner box is not increased, two heat exchange channels which are arranged in an up-down staggered mode are formed in the runner box. The heat exchange efficiency is improved, and the space is saved. The invention provides a multi-stage heat exchanger and a dilution refrigerator.

The invention relates to an adjustable multi-stage heat exchange injection type mixed working medium high-temperature heat pump system, and belongs to the technical field of high-temperature heat pump systems. The mixed working medium high-temperature heat pump system comprises a mixed working medium heat pump circulation loop and a gas-liquid jet type water supply loop. The mixed working medium heat pump circulation loop comprises a low-pressure compressor, a high-pressure compressor, working medium sides of four condensers, working medium sides of three evaporators and two two-phase ejectors, the working medium sides of the four condensers, the working medium sides of the three evaporators and the two two-phase ejectors are connected in series through two gas-liquid separators, and a working medium is a mixed working medium composed of cis-1, 3, 3, 3-tetrafluoropropene and isopentane. And the gas-liquid injection type water supply loop comprises a gas-liquid injector, a water pump and water sides of the three condensers. And the mixed working medium heat pump circulation loop and the gas-liquid jet type water supply loop are mutually coupled. The two gas-liquid separators are adopted to form four-stage condensation heat exchange, so that the energy utilization efficiency can be effectively improved, and the irreversible loss in the condensation process is reduced by at least 5%; evaporator evaporation of three different pressure levels is formed through boosting of the two two-phase ejectors, and irreversible loss in the evaporation process is reduced by at least 55%.

The invention discloses a liquid cooling dehumidification unit and relates to the field of humidity control, the liquid cooling dehumidification unit comprises a second loop and a bypass branch, a compressor provides power for the second loop, a high-temperature refrigerant of an evaporator is conveyed to a condenser to dissipate heat and cool the outside, and the cooled refrigerant flows back to the evaporator; the bypass branch and the evaporator are arranged in parallel, and the refrigerant cooled by the condenser is divided into two paths to flow through the bypass branch and the evaporator respectively, so that the bypass heat exchanger and the evaporator form low temperature; the bypass heat exchanger and the condenser are arranged side by side, the second loop and the bypass branch share the same fan for heat dissipation, the fan guides airflow to pass through the bypass heat exchanger and the condenser respectively, high-temperature air formed after passing through the condenser is cooled by the bypass heat exchanger, and water vapor carried when the high-temperature air reaches the bypass heat exchanger is condensed into water drops. Condensation and dehumidification are achieved. And the second loop and the bypass branch share the same fan, so that structures and pipelines are reduced, and the space utilization rate is increased.

The invention discloses a Carnot battery system based on phase change cold storage and energy storage and a multi-mode operation method thereof, the Carnot battery system comprises a vapor compression refrigeration unit, a phase change cold storage device and a power cycle unit, in a charging stage, the vapor compression refrigeration unit is adopted to generate cold energy by using off-peak power; in the energy storage stage, cold energy prepared by the steam compression refrigeration unit is stored in a high-density mode through the phase change cold storage device; in the discharging stage, the stored cold energy serves as a cold source, external low-temperature waste heat serves as a heat source, a power circulation unit is adopted, meanwhile, the cold energy and the hot energy are utilized for heat-work conversion, and electric energy is released; according to the Carnot battery system provided by the invention, the round-trip efficiency and the energy storage density of an energy storage system can be improved, the energy storage cost is reduced, and large-scale long-time energy storage is facilitated; according to the multi-mode operation method provided by the invention, through dispatching application of the phase change cold storage device and the charge-discharge cycle, different types of low-temperature heat sources can be fully utilized, and the cold electricity energy consumption requirement of a user side is met.

The present invention discloses a weather-resistant refrigeration system and a permafrost protection method applied to the Qinghai-Tibet Plateau, belonging to the field of permafrost protection technology. The refrigeration system includes a plurality of refrigeration units on the ground and a plurality of permafrost coolers in the permafrost. The refrigeration unit is provided with a plateau environmental performance improvement component, and the permafrost cooler is connected to the refrigeration unit; the protection method is to design a refrigeration system according to permafrost, control the refrigeration unit through a control component to cool the refrigerant and then transport it to the permafrost cooler for heat exchange with the permafrost, so that the temperature of the permafrost is reduced. The plateau environmental performance improvement component can make the refrigeration component adapt to the environment of drastic fluctuations in the plateau climate, and improve the weather resistance of the refrigeration system operation; the refrigeration system using an assembled structure is convenient for transportation and installation, and has an adaptive adjustment function for the plateau climate and the permafrost geological environment, ensuring the balance of refrigeration supply and demand and the permafrost protection effect.

A refrigeration cycle device includes: a compressor; a heat radiating unit that causes refrigerant to heat air supplied to a space inside a vehicle cabin; a decompression unit that decompresses the refrigerant; an outside air heat absorbing unit that causes the refrigerant to absorb heat from outside air; a waste heat absorbing unit that causes the refrigerant to absorb waste heat of a waste heat device; a shutter that opens and closes a passage for the outside air introduced into the outside air heat absorbing unit; and a control unit that closes the shutter when it is determined that an amount of waste heat of the waste heat device is larger than an amount of heat absorbed by the refrigerant in the outside air heat absorbing unit and the waste heat absorbing unit.

The invention relates to the technical field of intelligent control of refrigeration equipment, in particular to an artificial intelligence-based screw compressor running state control system and method, which comprises a signal acquisition unit, a disturbance identification unit and a compressor control unit, the signal acquisition unit acquires a refrigeration house door opening and closing state time sequence signal and three-dimensional temperature field change data, the disturbance identification unit synchronously locks the door opening moment through a timestamp, divides a core influence area and a stable conduction area, analyzes the correlation between the temperature change rate and the door opening angle and the temperature fluctuation amplitude, and determines the temperature change rate of the door opening angle. And the door opening disturbance or equipment abnormity identification factor is output, and the compressor control unit executes differential regulation according to the door opening disturbance or equipment abnormity identification factor, so that the problems of disturbance misjudgment and regulation rigidity in traditional control are solved, and the operation stability and energy consumption control precision of the compressor are improved.

The present invention provides a wind-driven direct-driven refrigeration device and a design method for protecting permafrost, which belongs to the field of permafrost engineering technology. The refrigeration device includes a cabinet and a wind turbine unit installed inside the cabinet, a transmission speed-changing mechanism unit and a refrigeration unit. The wind turbine unit is used to convert wind energy into mechanical energy, the transmission speed-changing mechanism unit is used to increase the speed of the wind turbine unit output and the output speed can be adjusted autonomously, the output speed of the transmission speed-changing mechanism unit is limited within a reasonable range, and the refrigeration unit is used to transport cold to the inside of the permafrost foundation to refrigerate the permafrost and protect the permafrost. The wind-driven direct-driven refrigeration device and a design method for protecting permafrost provided by the present invention solve the technical problem of low energy utilization rate of the equipment and methods used for protecting permafrost in the prior art, and have the technical effects of reducing energy loss, high energy utilization rate, high efficiency of the refrigeration system, and good practicality.

The invention relates to the technical field of unit detection, and discloses an intelligent fault self-diagnosis method for an evaporative condensation integrated screw water chilling unit, which comprises the following steps of: decoupling operation data of a compressor through a blind source separation algorithm, performing image processing on operation data of a condenser in combination with a morphological analysis method, and performing fault diagnosis on the operation data of the condenser; the operation characteristics of the compressor and the operation characteristics of the condenser can be extracted respectively, effective decoupling and clear expression of coupling signals are realized, and by constructing a dual-channel LSTM network comprising a gating fusion unit and introducing a cross-channel coupling gating mechanism, the system reliability is improved. The dynamic coupling relation between the compressor and the condenser can be modeled and regulated in the time dimension, the coupling mechanism between the compressor and the condenser is truly reflected, the time sequence parameter sequence is input into the pre-trained deep LSTM network, the fault types such as control lag and performance degradation can be accurately recognized, and the fault diagnosis accuracy is improved. Therefore, the accuracy and real-time performance of fault diagnosis are improved, and the requirement for intelligent fault management of the water chilling unit is met.

The invention relates to an electric vehicle air conditioner refrigerating circuit state estimation method based on data-driven modeling and an extended Kalman filtering algorithm, and belongs to the field of electric vehicle air conditioner system refrigerating circuit state monitoring. The method comprises the following steps: establishing a continuous state space equation based on a moving boundary method, a momentum law, a mass conservation law and an energy conservation law; collecting real vehicle data, and identifying system parameters of the system state equation based on a least square search method; discretizing the continuous state space equation; and estimating the refrigerant loop state by adopting an extended Kalman filtering method according to the discretized state-space equation and the parameters of the identification system. According to the method, the grey box model and the moving boundary method are adopted, the least square algorithm and the extended Kalman filtering are combined, and efficient modeling and accurate state monitoring of the refrigerant loop system are achieved. According to the method, modeling complexity is simplified, real-time performance and precision are improved, and important support is provided for performance improvement of an automobile air conditioning system.

A cooling system includes a liquid loop, a vapor compression loop, and a heat exchanger in fluid communication with each of the liquid loop and the vapor compression cycle loop. The liquid loop includes a cold sink for cooling a heat load. The vapor compression cycle loop is fluidly coupled to the liquid loop by a separator, which is configured to separate a two-phase form of a working fluid received from the cold sink into a vapor form of the working fluid and a liquid form of the working fluid.

The invention provides a wind power direct drive type refrigeration device for protecting permafrost and a design method, and belongs to the technical field of permafrost engineering, the refrigeration device comprises a cabinet, a wind turbine unit, a transmission speed change mechanism unit and a refrigeration unit, and the wind turbine unit, the transmission speed change mechanism unit and the refrigeration unit are installed in the cabinet; the transmission speed change mechanism unit is used for increasing the rotating speed output by the wind turbine unit, the output rotating speed can be automatically adjusted, the rotating speed output by the transmission speed change mechanism unit is limited within a reasonable range, and the refrigeration unit is used for conveying cold energy into the permafrost foundation so as to refrigerate permafrost and protect the permafrost. According to the wind power direct drive type refrigerating device for protecting the permafrost and the design method, the technical problem that in the prior art, equipment and methods used for protecting the permafrost are low in energy utilization rate is solved, and the technical effects that energy loss is reduced, the energy utilization rate is high, the refrigerating system efficiency is high, and practicability is good are achieved.

The invention discloses an energy-saving type magnetic suspension centrifugal water chilling unit, and relates to the technical field of refrigeration, the energy-saving type magnetic suspension centrifugal water chilling unit comprises a magnetic suspension compressor, a variable-diameter throttling mechanism and a heat exchange system, the heat exchange system is fixedly installed on the side face of the outer wall of the magnetic suspension compressor, and the variable-diameter throttling mechanism is fixedly installed on the side face of the outer wall of the heat exchange system; an outlet of the magnetic suspension compressor is directly connected with the heat exchange system through a pipeline, and the reducing throttling mechanism is connected with the heat exchange system through a pipeline. The front-stage closed impeller and the rear-stage semi-open impeller are coaxially connected in series, efficient compression without mechanical contact and oil lubrication is achieved, the problems that a centrifugal compressor is high in energy consumption and large in vibration due to mechanical friction are solved, and the energy efficiency ratio of a unit is effectively increased.

The present invention relates to the field of chillers, and discloses a screw air-cooled chiller and an operation method, including setting a target cold water temperature and environmental adaptation parameters, starting a compressor and a fan, and gradually increasing the operating power; adjusting the operating frequency of the compressor and the fan speed according to the actual load demand, monitoring the evaporation temperature and the condensation temperature in real time, and optimizing the throttling device opening; starting and stopping the compressor according to the load demand in a multi-compressor system, and reducing the fan speed and the compressor power at low ambient temperature; periodically defrosting or adjusting the fan speed when running at low load or at low ambient temperature, regularly cleaning the evaporator and condenser, and removing the accumulated scale; monitoring the fault state in real time through a sensor and an electronic control system, and executing automatic shutdown, load reduction or sending an alarm according to the fault level. The present invention has the advantage of ensuring the long-term stable operation of the equipment.

The utility model discloses an anti-cavitation device and a fluorine pump air conditioning system.The anti-cavitation device is used for the fluorine pump air conditioning system and comprises a bypass pipeline, and one end of the bypass pipeline is connected with an outlet of a fluorine pump of the fluorine pump air conditioning system; and the other end of the connecting pipe is connected to a reflux inlet of a liquid storage tank of the fluorine pump air-conditioning system or connected to a liquid storage tank inlet pipe of the liquid storage tank. According to the anti-cavitation device and the fluorine pump air-conditioning system, the bypass pipeline is arranged between the fluorine pump outlet of the fluorine pump air-conditioning system and the liquid storage tank, and the refrigerant flows back into the liquid storage tank from the fluorine pump outlet by utilizing the high pressure of the fluorine pump outlet, so that the refrigerant in the liquid storage tank is not gasified due to the fact that the pressure in the liquid storage tank is not easy to drop quickly; therefore, the cavitation phenomenon of the fluorine pump can be reduced, the cutoff resistance and the cavitation resistance of a fluorine pump refrigerating circuit are greatly improved, the operation efficiency of the fluorine pump is improved, and the service life of the fluorine pump is long.

The invention discloses a weather-resistant refrigerating system applied to the Qinghai-Tibet Plateau and a permafrost protection method, and belongs to the technical field of permafrost protection.The refrigerating system comprises a plurality of refrigerating units on the ground and a plurality of permafrost cold conveying devices in permafrost, and each refrigerating unit is provided with a plateau environment performance improving assembly; the permafrost cold conveying device is connected with the refrigerating unit; according to the protection method, the refrigerating system is designed according to the permafrost, the refrigerating unit is controlled by the control assembly to cool the refrigerant, and then the refrigerant is conveyed to the permafrost cold conveying device for heat exchange with the permafrost, so that the temperature of the permafrost is reduced. Through the plateau environment performance improving assembly, the refrigerating assembly can adapt to the environment with severe fluctuation of plateau climate, and the weather resistance of operation of the refrigerating system is improved; the refrigerating system of an assembly type structure is convenient to transport and install, has a self-adaptive adjusting function aiming at the plateau climate and the permafrost geological environment, and guarantees the refrigerating capacity supply and demand balance and the permafrost protection effect.

The utility model discloses a household snow melting machine which comprises a stirring assembly and a refrigerating assembly, the stirring assembly comprises a protective cover, a driving motor and a scraper, the refrigerating assembly comprises an evaporator, the evaporator is arranged on the side portion of the driving motor and connected with the protective cover, the stirring assembly further comprises a sealing ring, and the sealing ring is arranged on the side portion of the driving motor and connected with the scraper. The sealing ring comprises an inner sealing ring, a sealing outer ring and a sealing inner ring, the sealing outer ring and the sealing inner ring are arranged on the front side and the rear side of the inner sealing ring respectively, an inner ring plate is arranged at the end of the protection cover, the evaporator penetrates through the inner ring plate, the sealing outer ring abuts against the surface of the side, close to the evaporator, of the inner ring plate, and the sealing outer ring abuts against the surface of the side, close to the evaporator, of the inner ring plate. The sealing inner ring abuts against the surface of the side, close to the driving piece, of the inner ring plate, and the inner sealing ring is arranged at the joint of the inner ring plate and the outer wall of the evaporator. According to the utility model, the sealing performance and the waterproofness can be improved, water seepage and oil seepage are prevented, potential safety hazards are avoided, and the service life is prolonged.

The invention provides a two-phase refrigerator control system and method applied to electrochemical energy storage, the system comprises a two-phase refrigerator, a sensor and a controller, the two-phase refrigerator is composed of a cooling circulation pipeline, a refrigeration circulation pipeline, a plate heat exchanger and a liquid storage tank, the sensor is used for monitoring temperature and pressure, and the controller is used for controlling the temperature and the pressure. The controller accurately controls the system through the electromagnetic valve, the circulating pump, the compressor and the centrifugal fan. The control method is divided into a self-circulation mode and a refrigeration mode, automatic switching can be achieved according to temperature changes, and the cooling efficiency and stability are ensured. Through dual-mode intelligent and frequency conversion control switching, the cooling efficiency and the energy efficiency ratio are remarkably improved, and the problem that in the prior art, the cooling power of a two-phase liquid cooling machine is difficult to effectively control is effectively solved.

The invention relates to the technical field of automatic control, in particular to a low-temperature control system of a centrifugal variable-frequency magnetic suspension water chilling unit, which comprises an environment heat parameter detection module, a condensation pressure deviation identification module, a condensate water flow rate regulation and control module, a refrigerant flow evaporation linkage module and an energy consumption curve dynamic construction module. According to the method, the inlet and outlet water temperature of the condenser and the external air temperature are collected, and synchronous filing and water temperature difference rate normalization processing are combined, so that when the external temperature changes drastically, the abnormal trend of water temperature change lag can be captured in time, and the condensation instability risk is pre-judged in advance; based on local pressure change rate gradient density analysis, abnormal fluctuation of condensation pressure is precisely discriminated, the problem that the local instability risk is covered by a global mean value is avoided, and the early warning timeliness is improved; the flow speed of condensate water is dynamically adjusted according to condensation instability characteristics, PID dynamic correction is conducted by extracting the rotating speed and flow speed error of a water pump, it is ensured that the heat exchange performance of a condenser continuously meets the low-temperature change requirement, and the condensation pressure stability is remarkably improved.

A refrigeration circuit comprising one first compressor (1), a first gas-cooler (7), connected to the first compressor through a common discharge line (41), a medium temperature expansion valve (19), a medium temperature heat exchanger (20), a liquid receiver (17) that is connected to an outlet liquid line (80) that splits in a first liquid line (81) that connects with the medium temperature heat exchanger and a second liquid line (82) that comprises a first expansion valve (28), to a first pressure reduction valve (14) and to a first heat exchanger (18), wherein the refrigerant flowing through the second liquid line is also mixed with the refrigerant from the first liquid line leaving the medium temperature heat exchanger and the mixture enters the first heat exchanger to exchange heat with the refrigerant in the first liquid line to be directed to the first compressor through a suction line (59).

The invention discloses a defrosting control method and device, refrigeration equipment and a storage medium, and belongs to the technical field of defrosting. According to the defrosting control method, in the first stage, the heater is controlled to defrost the evaporator; entering a second stage when the defrosting state of the first stage meets a first condition; and in the second stage, a compressor exhaust pipe of the refrigerating system is controlled to communicate with the evaporator to conduct hot gas defrosting, and when hot gas defrosting is conducted under the first condition, the heat exchange medium flowing out of the evaporator is in a gaseous state. According to the defrosting control method disclosed by the invention, the heater is firstly controlled to defrost, and then the compressor is controlled to defrost by hot gas, so that staged defrosting is realized; the defrosting state of the first stage is controlled, so that the surface temperature of the evaporator is not too low when hot gas defrosting is carried out, heat exchange media flowing out of the evaporator are prevented from being liquefied, and liquid impact is prevented; and meanwhile, the heater is turned off in the second stage, and excessive heat generated by the heater can be prevented from overflowing to the compartment.

The utility model discloses an efficient cooling-water machine which comprises a machine shell, and an installation cavity is formed in the machine shell. The water tank is provided with a water return connector and a water outlet connector. The heat exchanger is provided with a first heat exchange pipe and a second heat exchange pipe, one end of the first heat exchange pipe is communicated with the water return connector, and the other end of the first heat exchange pipe is communicated with a pipeline of external equipment; the refrigeration assembly comprises a compressor, a condenser, a drying filter and a capillary tube, an outlet of the compressor communicates with an inlet of the condenser, an outlet of the condenser communicates with an inlet of the drying filter, an outlet of the drying filter communicates with one end of the capillary tube, and the other end of the capillary tube communicates with one end of the second heat exchange tube. The other end of the second heat exchange pipe communicates with an inlet of the compressor. Heat exchange between water in the water tank and a refrigerant is achieved through the first heat exchange pipe and the second heat exchange pipe of the heat exchanger, cooling is conducted through cold water in the water tank, and the cooling amount and the cooling efficiency are improved.

The present disclosure relates to a refrigeration system comprising: a compressor (1); an air outlet (2A) of the evaporator (2) is communicated with the air suction port (1A) of the compressor (1) through an air suction pipeline (10); an air inlet (3A) of the oil separator (3) is communicated with an exhaust port (1B) of the compressor (1), an oil outlet (3B) of the oil separator (3) is communicated with the compressor (1) through a first oil return pipeline (20), and a pump (11) is arranged on the first oil return pipeline (20); a liquid inlet (4A) of the automatic oil return device (4) is communicated with the evaporator (2) through a liquid taking pipeline (60) and used for obtaining the liquid refrigerant in the evaporator (2), an oil outlet (4B) of the automatic oil return device (4) is communicated with the air suction pipeline (10) through a second oil return pipeline (30), and at least one of the liquid taking pipeline (60) and the second oil return pipeline (30) is provided with a first on-off valve (18).

A compressor according to an embodiment includes: a cylinder; a piston configured to be reciprocable in the cylinder; a suction space capable of communicating with a working chamber formed by the cylinder and the piston; a discharge space capable of communicating with the working chamber; a partition wall portion disposed so as to surround the working chamber, and separating the suction space and the discharge space; and a cooling medium path formed in the partition wall portion.