1373results about "Refrigeration devices" patented technology

The invention discloses a multi-stage countercurrent gradient cold accumulation type heat exchange system, a control method thereof and a beverage dispenser. The system comprises at least two cold storage units connected in series, a cold exchange pipeline and a heat exchange pipeline. The cold exchange pipeline is an evaporator part of the refrigerating circuit, is sequentially connected in series and flows through the cold storage units, and exchanges cold energy to the cold storage medium. The heat exchange pipeline sequentially penetrates through all the cold storage units, and the fluid to be cooled circulates and exchanges heat with the cold storage medium. The flowing direction of fluid in the heat exchange pipeline is opposite to the flowing direction of refrigerant in the cold exchange pipeline, during continuous output, the temperature of the front-order cold storage unit is lower than that of the rear-order cold storage unit, and a temperature gradient used for countercurrent flow heat exchange is formed and maintained. The volume of the preorder cold storage unit is smaller than or equal to that of the subsequent unit, the volume of the first unit is configured according to single-cup refrigeration requirements, and quick starting is achieved; the volume of a subsequent unit is large and serves as gradient cold accumulation buffering, and the constant temperature of continuous cup discharging is guaranteed. The problems that a traditional beverage dispenser is slow in starting and unstable in continuous cup discharging temperature are solved.

The refrigerator includes: a main body; a storage chamber formed inside the main body; a door provided so that the storage compartment can be opened and closed; an evaporator that evaporates the refrigerant to generate cold air; an evaporator duct disposed at a rear side of the storage compartment to supply the cold air generated by the evaporator to the storage compartment; and a thermoelectric cooling device including a thermoelectric element having a heating unit and a cooling unit. The thermoelectric cooling device is configured to heat air from the outside of the main body by the heating unit and discharge the air heated by the heating unit to the outside of the main body, cool air from the storage compartment by the cooling unit, and supply the air cooled by the cooling unit to the storage compartment, and is disposed above the storage compartment.

A refrigerator may include: a storage compartment; a cooling sink (CS); a thermoelectric element including a cooling layer contacting the CS, the thermoelectric element configured to, based on a voltage pulse applied to the thermoelectric element, cool the cooling layer and thereby cool the CS; a fan controllable to generate an airflow to be cooled by the CS; a cooling duct covering the CS and fan, and configured to guide the airflow from the storage compartment to the CS and to accommodate defrost water generated by water, frozen by the CS, being defrosted; a temperature sensor to detect a temperature of the CS; and a processor configured to: control the cooling fan to evaporate the defrost water, and perform an anti-freezing control so that the defrost water does not freeze, the anti-freezing control including adjusting a duty ratio of the voltage pulse based on the detected temperature of the CS.

A fluid management system (1) for conditioning a coolant (2) in a coolant circuit (3) of an immersion-cooled battery system (4), includes a pump (5), at least one temperature control element (6, 7), at least one filter element (8, 9), a dehumidifying element (10), and a housing (11) in which the pump (5), the at least one temperature control element (6, 7), the at least one filter element (8, 9) and the dehumidifying element (10) are arranged, the housing (11) including a coolant inlet (12) configured to receive the coolant (2) to be conditioned, a coolant outlet (13) configured to output the conditioned coolant (2), and a coolant path (14) configured to conduct the coolant (2) through the housing (11) in a flow direction D from the coolant inlet (12) to the coolant outlet (13).

The present invention relates to the field of agricultural product preservation technology, which discloses a flexible air duct precision temperature control system and its control method. The temperature control system refrigeration component includes a flexible air duct component connected to the top of a cold storage through an air cooler, the flexible air duct component includes a flexible air duct, and a plurality of cold storage plates are arranged in different areas in the flexible air duct; a sensor component is used to collect temperature signals and pressure difference signals in the cold storage and the refrigeration component; a controller controls the refrigeration component to process the cold storage plates in three working modes: refrigeration, cold storage and defrosting, and improves the temperature uniformity of the cold storage through the flexible air duct component and the cold storage plates, and reduces the temperature fluctuation in the cold storage during defrosting. The present invention uses flexible air ducts and cold storage plates to improve the temperature uniformity of the cold storage; adopts two exchangers, the air cooler and the cold storage plate, and controls the cold capacity in the cold storage plates when the refrigeration equipment defrosts, so as to significantly reduce the temperature fluctuation in the storage during defrosting.

A refrigerator including a main body including a storage compartment; a first cooler configured to cool the storage compartment, and including a thermoelectric element, a heat dissipation fan, and a cooling fan; a second cooler configured to cool the storage compartment, and including a compressor, and an evaporator fan; and at least one processor configured to, based on a failure in the first cooler, increase an operating speed of the compressor and the evaporator fan of the second cooler.

The invention provides a refrigerating system, a control method and device thereof, equipment and a storage medium, belongs to the technical field of refrigerating control, and solves the problems that operation parameters of the refrigerating system cannot be accurately controlled and energy consumption is high. The control method comprises the steps that the mass of articles stored in a compartment of the refrigeration equipment, the temperature in the compartment and the temperature of the environment where the refrigeration equipment is located currently are obtained; the optimal operation frequency of a compressor is determined according to the article mass and the temperature in the compartment; and the optimal opening degree of the electronic expansion valve is determined according to the optimal operation frequency and the environment temperature, so that the operation parameters of the refrigeration system can be more accurately controlled, and the energy consumption is reduced.

A refrigerator includes a first storage compartment, a heat source, a cold source, a water molecule freezing preventing device, and a controller configured to perform a first operation based on a first notch temperature for a first cooling operation, a second operation based on a second notch temperature for a heating operation, and a third operation based on a third notch temperature for a second cooling operation. The second notch temperature is higher than 0° C., and the third notch temperature is higher than the first notch temperature. Accordingly, it may be possible to efficiently supply the cold or heat until reaching a supercooling maintenance section.

The invention provides an integrated intelligent cooking system and a mechanical arm path planning method applying the same, and belongs to the technical field of cooking equipment.The integrated intelligent cooking system comprises an intelligent cooking rack assembly, a display screen is arranged at the front end of the intelligent cooking rack assembly, and at least two mechanical arms are slidably connected to the inner top of the intelligent cooking rack assembly; a cooking platform is arranged in the middle of the intelligent cooking rack assembly, a cooker rack is arranged on one side of the intelligent cooking rack assembly, and a cleaning system is arranged in the intelligent cooking rack assembly; the cooker is arranged on the cooker rack; the cooking part is arranged on the cooking platform, and the cooking part and the mechanical arm are arranged in a spaced mode; the conveying trolley is arranged at the inner bottom of the intelligent cooking rack assembly, and the conveying trolley and the mechanical arm are arranged in a spaced mode through the cooking platform; the drying and ventilating system is arranged in the intelligent cooking rack assembly, and the drying and ventilating system is used for discharging oil smoke and drying the cooking utensils, the cooking platform and the cooking parts.

The invention relates to a low-temperature circulating water cooling control method and device, and the method comprises the following steps: pumping cooling tower water to a water plate type heat exchange unit through a primary side water pump, and collecting the temperature of a water outlet pipeline of the water plate type heat exchange unit to obtain water outlet temperature characteristic parameters; performing flow detection on an outlet pipeline of the secondary side water pump through a flow sensor to obtain operation parameters of the secondary side water pump; based on the outlet water temperature characteristic parameters and the secondary side water pump operation parameters, rotating speed linkage adjustment is conducted on a primary side water pump, and a primary side water pump rotating speed control quantity is obtained; thermodynamic analysis is conducted on the heat exchange process of the water-water plate type heat exchanger unit based on the primary side water pump rotating speed control quantity, and heat exchange efficiency parameters are obtained; and through a multivariable PID controller, the side water flow of the primary side water pump is controlled based on the heat exchange efficiency parameter and the secondary side water pump operation parameter, and the technical problem that dynamic balance between the primary side water flow speed and the secondary side target water supply temperature is extremely prone to being broken is solved.

The invention relates to a refrigerator and a control method thereof. The refrigerator comprises a refrigerator body, a refrigerating system, a temperature sensor and a controller, and is configured to determine an initial control parameter corresponding to the current environment temperature based on a parameter initialization model; for each iteration process, the refrigerator is controlled to operate in a single cycle according to the refrigerator control parameters corresponding to the iteration process, and performance evaluation data corresponding to the single-cycle operation of the refrigerator is obtained; under the condition that the performance evaluation data corresponding to the current single-cycle operation meets a preset updating condition, according to the performance evaluation data corresponding to the current single-cycle operation, refrigerator control parameters corresponding to the current iteration process are updated, and refrigerator control parameters corresponding to the next iteration process are obtained; and continuing to execute the next iteration process until the performance evaluation data in the latest iteration process does not meet the preset updating condition any more. The method can achieve the energy-saving effect of the refrigerator.

A modular refrigerator including a main cabinet, and a sub-cabinet selectively coupleable to a right side, an upper side, and a left side, of the main cabinet. The main cabinet includes a cooling unit, a first connection duct for cold air generated by the cooling unit to flow toward the right side, a second connection duct for the cold air to flow toward the upper side, and a third connection duct for the cold air to flow toward the left side. The sub-cabinet includes a first branch duct that, when the sub-cabinet is coupled to the right side, communicates with the first connection duct, a second branch duct that, when the sub-cabinet is coupled to the upper side, communicates with the second connection duct, and a third branch duct that, when the sub-cabinet is coupled to the left side, communicates with third connection duct.

The invention relates to an airflow cooling device for improving the cooling efficiency of a photovoltaic welding strip, and belongs to the technical field of photovoltaic welding strip production. The airflow cooling device comprises a base, a cooling box is fixed to the upper surface of the base, a feeding port is formed in one side of the cooling box, a discharging port is formed in the other side of the cooling box, an air cooler is fixed to the top of the cooling box, and an air guide pipe is fixed to the groove top of an inner cavity of the cooling box; according to the airflow cooling device capable of improving the cooling efficiency of the photovoltaic welding strip, the distance between the air opening and a copper wire of the photovoltaic welding strip is adjusted through the electric push rod, so that cold air makes contact with the copper wire of the photovoltaic welding strip at the optimal temperature, and the cooling efficiency of the photovoltaic welding strip is improved while airflow cooling is conducted. The multiple cooling air ports continuously move in a reciprocating mode, cold air can cover the surface of the photovoltaic welding strip copper wire more evenly, the relative speed between the nozzle and the photovoltaic welding strip copper wire can be reduced, the time of the photovoltaic welding strip copper wire acted by cooling airflow is prolonged, the contact time is prolonged, and the cooling effect is improved.

A cryogenic cooling system comprises a vacuum chamber (101), a plurality of thermal stages (105, 106, 107, 503, 504) cooled to respective temperatures during operation, and a gastight sleeve (301, 401), at least a portion of which protrudes in the vacuum chamber (101). Inside said gastight sleeve (301, 401) are one or more cooling stages (501, 502) of a first cooling module (302). At least a first part (505, 506) of a second cooling module is inside said gastight sleeve (301, 401). A first thermally conductive coupling (508, 509, 510) exists between a first cooling stage (501, 502) and said first part (505, 506) of said second cooling module. A second thermally conductive coupling (515, 516, 521) exists between a first thermal stage (105, 106, 107) and a respective part (304, 305) of said second cooling module.

The S-shaped flow channel liquid cooling plate for heat dissipation of the semiconductor vehicle-mounted refrigerator and the heat dissipation device of the S-shaped flow channel liquid cooling plate comprise a liquid cooling plate body, at least one S-shaped flow channel and a linear flow channel are arranged in the liquid cooling plate body, the liquid inlet side of the S-shaped flow channel is connected with a liquid inlet, all the S-shaped flow channels converge to the linear flow channel, and the other end of the linear flow channel is communicated with a liquid outlet. Each S-shaped flow channel comprises a plurality of flow channels shaped like a Chinese character'ji ', and the adjacent flow channels shaped like the Chinese character'ji' are communicated with each other. The heat dissipation performance can be effectively improved, the flowing path of cooling liquid is optimized, a flowing dead zone is avoided, and the overall heat dissipation efficiency is improved.

The utility model discloses a refrigeration structure with an anti-deformation pipeline and an ice cream machine using the refrigeration structure. The refrigeration structure comprises a freezing cylinder, a compressor, a heat exchanger, a refrigeration circulating pipeline and a heat exchange circulating pipeline, the compressor is provided with a condensation outlet, a condensation inlet, a heat exchange inlet and a heat exchange outlet; the refrigeration circulation pipeline comprises a capillary tube, a condensation tube and an air return tube which are sequentially communicated; the heat exchange circulation pipeline comprises a cold source input pipe and an exhaust pipe. According to the refrigeration structure, an air return pipe is arranged in a refrigeration circulation pipeline, an exhaust pipe is arranged in a heat exchange circulation pipeline, and a plurality of sections of bent structures are arranged in the air return pipe and the exhaust pipe respectively, so that anti-bending structures are formed. Due to the fact that the air return pipe and the exhaust pipe are of a bent structure, the air return pipe and the exhaust pipe can bear drawing force and deform to a certain degree when vibration occurs in the transportation process or collision and falling occur in the carrying process, and therefore the air return pipe and the exhaust pipe can bear influences caused by vibration, and the problem that the air return pipe and the exhaust pipe are damaged is solved.

The utility model relates to the technical field of cooling water treatment, and discloses a casting machine cooling water treatment device which comprises a water tank, a top plate is fixedly connected to the upper portion in the water tank, a filtering mechanism is arranged above the top plate, and a fixing plate is fixedly connected to the position, located on the right side of the lower portion of the top plate, in the water tank. The water tank is internally provided with a fixing plate, the fixing plate divides the interior of the water tank into two cavities, and a first refrigerator is arranged at the bottom end of the interior of the water tank and located in the cavity on the left side of the fixing plate. And the sprayed cooling water makes contact with the casting, the temperature rises to form warm water, the warm water falls into a cavity, on the right side of the fixing plate, in the water tank, the sprayed warm water is fully refrigerated and used for circulating spraying again, the cooling efficiency is improved, and the cooling effect is good.

The invention relates to the technical field of refrigerators, in particular to a refrigeration cycle system for a refrigerator, the refrigerator and a working method of the refrigerator. The refrigeration cycle system comprises a compressor, a condenser, a filter, a throttling device, a liquid storage tank, an evaporator and an air return pipe which are sequentially connected in series through pipelines, a first control valve is arranged on the pipeline between the liquid storage tank and the evaporator, and a second control valve is arranged on the pipeline between the liquid storage tank and the throttling device. The liquid storage tank is pre-filled with a liquid refrigerant, and the refrigerant is quickly guided into the evaporator and then is instantly vaporized during first use by utilizing a siphoning effect, so that instant refrigeration is realized, the refrigerator can achieve an obvious refrigeration effect within a few minutes, and the first use experience is remarkably improved; secondly, the starting load can be reduced by means of siphoning, the compressor is prevented from operating in a high-load state for a long time in the initial stage, and the service life of the compressor is prolonged; in addition, the system is simple in structure, no complex mechanical device needs to be additionally arranged, and the system can be achieved only through cooperation of the liquid storage tank and the control valve.

The invention relates to the technical field of food spiral instant freezer feeding, in particular to a feeding conveying structure of a food processing spiral instant freezer, which comprises a conveying frame, the upper side of the conveying frame is fixedly provided with a lifting frame, the upper side of the lifting frame is fixedly provided with a discharging box, and one side of the discharging box is provided with a blanking channel; a material distribution assembly is rotationally installed in the material falling channel, and a guide box is fixedly installed on the upper side of the material discharging box. According to the feeding device, a material distribution motor drives a driving shaft to rotate, the driving shaft drives a rotating rod to rotate, the rotating rod drives a driving rod to rotate, the driving rod drives a reciprocating driving strip to move up and down in a reciprocating mode, and a material distribution groove which is not filled is close to a feeding port and is matched with a discharging soft cushion for filling; and the to-be-frozen food falls onto the conveying belt to be uniformly distributed, so that the sticking condition caused by stacking during quick freezing is prevented.

The invention discloses an optical thermostat with comprehensive vibration reduction and low-temperature in-situ displacement functions, which adopts upper and lower opposite vibration absorbers and a large-mass base to realize first-order to second-order inertial vibration absorption, and further realizes thorough decoupling with an optical platform in a suspension type non-contact manner, and the vibration transmissibility can be reduced to be less than 10%. Resonant frequencies of two systems (a sample table system and a cold head system) are designed to achieve vibration decoupling. The technical problems that in the prior art, the high-grade vibration isolation capacity is insufficient, refrigerator noise is easily coupled to a measuring light path, the low-temperature in-situ precision displacement capacity is lacked, and the contradiction between heat isolation, convenience and cost is difficult to balance can be solved. Under the support of a conventional GM refrigerator, the comprehensive requirements of ultralow basic vibration, strong decoupling of a measurement light path, low-temperature in-situ micron-sized displacement, convenient sample replacement and efficient refrigeration / thermal control are met at the same time.

The invention relates to the technical field of mine blasting, and discloses a high-temperature blasting drilling multi-layer thermal insulation charging device for strip mines, which comprises a multi-layer thermal insulation sleeve, a temperature monitoring module, an active cooling module and a quick release mechanism, the multi-layer thermal insulation sleeve comprises a phase change heat absorption layer, and an aerogel thermal insulation layer is fixedly mounted on the outer wall of the phase change heat absorption layer; a metal reflecting layer is fixedly installed on the outer wall of the aerogel heat insulation layer, the multiple layers of heat insulation sleeves are arranged, the high temperature of the external environment is effectively isolated through the multiple layers of structures of the multiple layers of heat insulation sleeves, internal explosives are protected against the influence of the high temperature, and the phase change heat absorption layer utilizes the phase change heat absorption characteristic of a paraffin-graphene composite material; a large amount of heat is absorbed and stored, temperature rise is effectively slowed down, the aerogel heat insulation layer further blocks heat transfer due to extremely low heat conductivity and excellent heat insulation performance, the metal reflection layer can effectively reflect solar radiation and heat radiation in the surrounding environment, and heat absorption is reduced.

The invention relates to the technical field of electric power energy storage control, and discloses a multi-dimensional state driven energy storage cold energy storage optimization control system and method, and the method comprises the steps: collecting the multi-dimensional state parameters of an energy storage system and the price of an electric power market, and judging a current operation time period mode; in the active cold storage mode, target cold storage capacity is determined according to the maximum allowable heat capacity buffer margin, and cold pre-storage is completed; in the cold capacity release mode, cold capacity-heat capacity collaborative multi-stage judgment is executed, the minimum critical mass flow rate meeting the heat exchange requirement is reversely solved, the minimum critical mass flow rate is mapped to a discrete control gear of the liquid cooling circulating pump to generate a final rotating speed instruction, and meanwhile closed-loop flow correction is executed; according to the method, the minimum critical mass flow rate is accurately solved, the rotating speed of the liquid cooling circulating pump is remarkably reduced while battery thermal inertia buffering is utilized, parasitic energy consumption is greatly reduced through the cubic relation between pumping power consumption and the rotating speed, and the problem that electric charge income is counteracted due to excessive pumping is solved.

The utility model aims to provide a pet water dispenser which mainly comprises a water storage device, a heating device for heating water stored in the water storage device, a cooling device arranged above the water storage device, a water drinking tray arranged below the cooling device and the like. Wherein the stored water is heated by the heating device to form water vapor, and when the water vapor flows upwards through the cooling device, the water vapor is cooled to form condensed water, and then the condensed water falls back into the drinking water tray. Compared with the prior art, the pet water dispenser provided by the utility model has the advantage that the safety index of drinking water is improved.

The invention discloses a distributed quick-frozen vegetable processing and freezing device and a freezing process thereof. The distributed quick-frozen vegetable processing and freezing device comprises a freezing box body, a base box body, a positioning conveying roller, a floating conveying roller, a lifting mechanism, a rotating mechanism and a side rotating bin, a plurality of lifting blocks and a plurality of floating conveying rollers can be driven by a hydraulic air cylinder to move up and down, so that vegetables are continuously dispersed and separated up and down on the upper sides of the floating conveying rollers and a plurality of positioning conveying rollers, freezing and bonding among the vegetables are reduced, and in the discharging stage, a plurality of friction wheels are driven by friction during reciprocating transmission of a friction belt to rotate synchronously; in this way, the multiple positioning conveying rollers and the multiple floating conveying rollers synchronously rotate and are separated from the vegetables, the vegetables are frozen and bonded with the multiple positioning conveying rollers and the multiple floating conveying rollers and then rapidly rotate and are separated, and meanwhile the vegetables are rapidly conveyed out through synchronous rotation of the multiple positioning conveying rollers and the multiple floating conveying rollers. The separation efficiency and the conveying and discharging efficiency of the vegetables are greatly improved.

A cryogenic cooling module comprises a vacuum chamber mmoodduullee (501) and, sup¬ ported therein, thermal stages (301, 302, 303) spatially displaced from each other in a first direction (310) and one or more heat radiation shields (304, 305, 306) corresponding to at least a subset of said thermal stages (301, 302, 303). A shape of said vacuum chamber module (501) is at least partly defined by one or more planar sides extending in said first direction (310). The vvaaccuuuumm chamber module (501) has an opening on one planar side, with a vacuum finish arrangement on edges (502) of said opening for enabling gastight closing. The thermal stages (301, 302, 303) reach, in a second direction (311) perpendicular to said first direction (310), to a first common interface plane (503) at or close to a plane defined by the edges (502) of the opening. Each of said one or more heat radiation shields has a respective second opening, edges of which reach to said first ccoommmmoonn inter- face plane (503).

The invention relates to a refrigerator and a control method thereof. The refrigerator comprises a refrigerator body, a refrigerating system, a temperature sensor and a controller, and is configured to obtain first environment state data of the refrigerator under the condition that the starting refrigerating condition of the refrigerator is met, and determine a first state mark according to the first environment state data; inputting the first environment state data into a first network model to obtain a prediction control parameter; according to the predictive control parameters, the refrigerator is controlled to operate in a single cycle; second environment state data of the refrigerator are obtained, and a second state mark is determined according to the second environment state data; under the condition that the second state flag is the same as the first state flag, inputting the second environment state data and the predictive control parameters into the second network model to update the predictive control parameters; and replacing the original predictive control parameter with the predictive control parameter, and returning to execute the step of controlling the single-cycle operation of the refrigerator until the second state mark is different from the first state mark. The method can improve the refrigeration efficiency.

A superconducting equipment cooling device includes a cryocooler that cools superconducting equipment, an interface configured to receive a selection of a plurality of performance parameters of the cryocooler by a user and generate an operation mode setting representing the selected plurality of performance parameters, and a controller configured to receive the operation mode setting from the interface and control a plurality of operation parameters of the cryocooler that affect the selected plurality of performance parameters.

The utility model relates to refrigeration equipment, the refrigeration equipment is provided with a supporting plate and a compressor fixed on the supporting plate, the supporting plate is provided with a main extension plane and opposite side edges in the depth direction, and the supporting plate at least comprises a plurality of mounting stations for the compressor, a plurality of supporting plates and a plurality of supporting plates, and at least one first reinforcing rib, which extends from the mounting station towards the side edge of the support plate, the first reinforcing rib being at least partially curved. According to the technical scheme, deformation of the supporting plate can be effectively prevented, so that it is ensured that a compressor of the refrigeration equipment can be correctly installed and normally operated, the vibration noise problem caused by deformation is avoided or reduced, and the operation performance and user experience of the refrigeration equipment are improved.

A cryostat comprises a vacuum enclosure (101) and, inside said vacuum enclosure, a plurality of nested radiation shields (102, 103). Stages of a cryogen-free cooling system (104) are thermally coupled with and configured to cool respective ones of said plurality of nested radiation shields (102, 103). Inside said vacuum enclosure (101) is a thermally conductive layer (201), at least partly surrounding said plurality of nested radiation shields (102, 103). A compressor-driven refrigerator (202) is thermally coupled with said thermally conductive layer (201) and configured to cool said thermally conductive layer (201).

The invention discloses a full-dynamic-pressure turbine type low-temperature refrigerating device and method. The device comprises a two-stage centrifugal compressor, a heat exchanger, a low-temperature turbine expander, a gas storage tank, a filter, a valve, a water cooling machine and a cold using device. Closed circulation is adopted in the device, and the whole device is integrated into a skid-mounted device to output cooling capacity outwards. The device adopts a full-dynamic-pressure turbine type structure and is supported by a gas bearing; the low-temperature turbine expander and the low-temperature heat exchanger are in a heat insulation environment; the low-temperature turbo expander adopts pressurization braking or fan braking; a three-stage integrated heat exchanger or a separated heat exchanger is adopted for skid-mounting; the skid-mounted system comprises a charging mode and a non-charging mode. The whole device runs without oil, and is clean and environment-friendly; the integration level of the system is greatly improved through the three-stage integrated heat exchanger and the skid-mounted structure; different braking modes are set, so that the applicability of the device is improved; the refrigerating temperature and the refrigerating capacity can be accurately controlled through the full-pressurization mode, the partial-pressurization mode and the bypass valve.