42results about How to "Adjust cooling capacity" patented technology

The invention discloses a permanent magnet synchronous motor cooling system for an electric automobile and a control method thereof. The cooling system comprises a control unit, a motor winding ammeter, a cooling water pump, a cooling water jacket, a cooling water temperature sensor, a cooling liquid flow meter, a heat radiator and a cooling fan. The control method comprises the following steps: judging whether a permanent magnet synchronous motor has a temperature rising trend or a temperature lowering trend under the working condition through detecting current of a motor stator winding, and adjusting a cooling capability of the cooling system so as to realize active adjustment of the cooling system; meanwhile, introducing auxiliary feedback adjustment and inquiring a working point of a motor through a motor efficiency MAP graph, so as to obtain the efficiency of the motor under the corresponding working condition; calculating the heat productivity of the motor; then feeding a difference value of the heat productivity of the motor and a heat radiation amount of the heat radiator back to the control unit, so as to correct the adjustment of the cooling system. The cooling system is subjected to active cooling control before the temperature of the motor is changed; energy sources are saved while a sufficient heat dissipation capability of the motor is guaranteed.

The invention discloses an infrared laser, which comprises a case, a pump module arranged in the case, semiconductor refrigeration sheets arranged in the case and a heat dissipation device arranged outside the case, wherein a first side of each semiconductor refrigeration sheet is arranged close to the pump module, and a second side of each semiconductor refrigeration sheet is arranged close to the wall of the case; and the heat dissipation device is arranged opposite to the second side of each semiconductor refrigeration sheet. The semiconductor refrigeration sheets perform temperature control on the pump module, the semiconductor refrigeration sheets are small in occupied space, simple in structure and low in noise, and the miniaturization requirement of the laser can be ensured. In addition, the semiconductor refrigeration sheets are good in refrigeration effect, and can realize heat dissipation and temperature control for the pump module through adjusting the voltage and directionof the two ends of the semiconductor refrigeration sheets.

The invention discloses special quenching oil for a plate spring and a preparation method for the special quenching oil, and belongs to the technical field of metal thermal treatment and surface treatment. The quenching oil is prepared from the following components in parts by mass: 25-37 parts of refined base oil, 2-4 parts of a cold catalyst, 0.02-0.03 part of an anti-oxidant, 0.3-0.5 part of abrightener, and 0.3-0.5 part of a surfactant. According to the special quenching oil for the plate spring and the preparation method for the special quenching oil disclosed by the invention, hardenability and critical through-quenching thickness of the plate spring material can be combined, and cooling ability of quenching oil is regulated, so that the plate spring obtains enough and uniform hardness and metallographic structure after being quenched, and therefore, mechanical strength and toughness needed for a workpiece are realized, and workpiece deformation is effectively controlled.

A variable cylinder engine is provided. The engine includes an engine body having a plurality of cylinders, a cooling mechanism for cooling the engine body, and a controller for controlling the cooling mechanism and changing a number of active cylinders according to an operating state of the engine. The controller reduces the number of active cylinders in a reduced-cylinder operating range set within a partial engine load range, and in a first reduced-cylinder range set within a high load part of the reduced-cylinder operating range, the controller improves cooling performance of the cooling mechanism compared with that in a second reduced-cylinder range set within a low load part of the reduced-cylinder operating range.

The invention discloses a cooling system. The cooling system comprises an outer circulating system and an inner circulating system used for cooling heating parts. A primary water tank cooling loop isarranged in the outer circulating system and comprises a cooling tower, a primary water tank and a first cooler. The water flowing from the cooling tower can flow through a refrigerant passage of theprimary water tank and a refrigerant passage of the first cooler in sequence and then flows back to the cooling tower. A first power device used for driving the water to flow is arranged in the primary water tank cooling loop. A heating medium passage of the first cooler is connected with the interior of the inner circulating system. The cooling system can reduce the temperature of the water in the primary water tank to the normal working range through the cooling tower, there is no need to replace the water in the primary water tank by opening a sluice to guarantee the cooling capacity of theouter circulating system in the prior art, and the cooling capacity of the outer circulating system can be adjusted more conveniently. The invention further discloses a boring machine including the cooling system, and the cooling capacity of the outer circulating system can be adjusted more conveniently.

The invention provides an LED street lamp light source module, a manufacturing method of the LED street lamp light source module and a cooling device of the LED street lamp light source module. The cooling device of the LED street lamp light source module comprises a light source installation board and a plurality of detachable cooling fins arranged on the second surface, opposite to the first surface, of the light source installation board, wherein the first surface of the light source installation board is used for installation of LED light sources. Due to the fact that the cooling fins can be assembled on the light source installation board and can be disassembled from the light source installation board, the cooling capacity of the LED street lamp light source module can be adjusted through the adjustment of the number of the cooling fins installed on the light source installation board according to the power of the LED street lamp light source module, the overall size of the LED street lamp light source module does not need to be adjusted, and therefore the cost for adjusting the heat-dissipation capacity of the LED street lamp light source module is reduced. According to the LED street lamp light source module and the manufacturing method of the LED street lamp light source module, due to the adoption of the cooling device, the cost for adjusting the cooling capacity of the LED street lamp light source module can be reduced as well.

The invention discloses a single-compressor three-cooling-head pulse tube refrigerating machine achieving free adjustment of the input work and the refrigerating capacity. The machine comprises a numerical control alternating current power source, a linear compressor, a pressure wave transmission pipeline set, an electric control valve set, a pulse tube refrigerating machine cooling head set, a cooling water system, a user side low-temperature circulating system and a data acquisition and control system. According to the single-compressor three-cooling-head pulse tube refrigerating machine achieving free adjustment of the input work and the refrigerating capacity, the purpose that the design and application scheme of variable-power operation and refrigerating capacity adjustment is provided for a large-refrigerating-capacity low-temperature system with the feature that the single compressor drives three pulse tube cooling heads is achieved, the problem that the refrigerating capacity of a conventional low-temperature system cannot be easily and correspondingly adjusted according to the requirements of user side equipment is effectively solved, the same system can meet the requirements of users for different refrigerating capacities, the large-refrigerating-capacity low-temperature system can have the more convenient and faster control, the higher application scene adaptabilityand the higher energy efficiency ratio, and can have the very positive significance in the application of the low-temperature refrigerating machine in the fields of intelligent power grids, advanced electric power, rail transit, efficient energy storage, high-end communication and the like.

The invention discloses a negative-pressure phase-change heat dissipation device and a high-heat-flux electronic chip simulation heat dissipation system, which utilize boiling coupling film evaporation to use a water working medium to generate phase change in a negative pressure environment, so as to realize efficient heat dissipation of a chip, and solve the problems that a liquid supply channel and a gas separation channel of an existing chip cold plate are mixed and the heat transfer capacity is low. A negative pressure environment is generated on one side of an evaporation waterproof breathable film, the pressure difference between the two sides of the film is increased, on one hand, mutual interference of traditional boiling heat exchange gas separation and liquid supply is avoided, on the other hand, the evaporation power and speed of the liquid are enhanced, the working efficiency of the cold plate is remarkably improved by utilizing a film evaporation mechanism, and the heat dissipation requirement that the heat flux density exceeds 1 kW / cm<2> can be met.

The invention discloses a cooling system and magnetic resonance equipment. The cooling system comprises a cooling loop cooling a to-be-cooled component. The cooling loop has a first cooling loop, a second cooling loop and an adjusting device, wherein the first and second cooling loops partially share a pipeline; and the adjusting device can adjust flow amount of cooling medium flowing through the first and second cooling loops. The cooling system and the magnetic resonance equipment can adjust flow amount of the cooling medium according to practical cooling demands of the magnetic resonance system, and then control one-time refrigerating capacity of a water cooling system, so cooling resource waste can be reduced.

An output-power-self-adapting refrigeration compressor control system which comprises a refrigeration compressor and a control system body. The refrigeration compressor is provided with a sealed shell. A machine core assembly is arranged in the shell. A motor is arranged on the machine core assembly and is provided with a stator, a rotor and a wire holder. A connection terminal I, a connection terminal VI and a connection terminal VII are arranged on the wire holder. The output-power-self-adapting refrigeration compressor control system is characterized in that the control system body comprises a PLC, a current collection module, a temperature collection module and a low-voltage control circuit; the wire holder is further provided with a connection terminal II, a connection terminal III, a connection terminal IV and a connection terminal V, the PLC is connected with the current collection module, the temperature collection module and the low-voltage control circuit in a communication mode, and the low-voltage control circuit is connected with the refrigeration compressor in a driving mode. The output-power-self-adapting refrigeration compressor control system is low in cost and convenient to operate, intelligent conversion of the three working states of the refrigeration compressor is achieved, the working efficiency of the refrigeration compressor is improved, the overall energy consumption of the refrigeration compressor is reduced, the refrigeration time is shortened, and the refrigeration efficiency is improved.

The invention discloses an air conditioner circulating refrigeration device for an LNG (Liquefied Natural Gas) vehicle. The air conditioner circulating refrigeration device comprises an LNG steel cylinder, a temperature control device, an air conditioner evaporator and an engine, wherein the LNG steel cylinder is connected with the temperature control device through a first pipeline, the temperature control device is connected with the air conditioner evaporator through a second pipeline, the air conditioner evaporator is connected with the engine through a third pipeline, a solenoid valve is installed on the first pipeline, a pressure stabilizer is arranged on the third pipeline, the LNG steel cylinder and the pressure stabilizer are connected with a fourth pipeline, a gasifier is installed on the fourth pipeline, a control device outlet temperature sensor is installed at the outlet of the temperature control device, a vehicle internal temperature sensor is installed in the vehicle, and the control device outlet temperature sensor, the vehicle internal temperature sensor and the solenoid valve are controlled by an electric control device. The air conditioner circulating refrigeration device additionally comprises a heat exchanger. The first medium inlet and the first medium outlet of the heat exchanger are arranged in the first pipeline, the second medium inlet of the heat exchanger is communicated with the outlet of the air conditioner evaporator through a backflow pipeline, and the second medium outlet of the heat exchanger is connected with the second pipeline. The air conditioner circulating refrigeration device for the LNG vehicle has the advantages of low cost and good refrigerating effect.

The invention discloses blast cooling equipment for a platinum channel. The blast cooling equipment is divided into two space areas including a cooling chamber and a blast chamber by semi-circular-annular air leakage bricks, ventilation holes are uniformly distributed in each semi-circular-annular air leakage brick, and a set of supporting bricks and a structure of air inlets and air outlets are installed at two modified ends. According to the equipment disclosed in the invention, after cooling air enters the blast chamber from an air supply opening, the air is uniformly dispersed after passing through ventilation openings, the dispersed air enters the cooling chamber, the cooling air cools the outer wall of the platinum channel while moving quickly towards inner air outlets and outer airoutlets located at two sides, thereby indirectly cooling molten glass in the platinum channel, and the purpose of cooling is achieved by the repeated cycle cooling; and at the same time, the cooling equipment can be installed in any place that needs to be cooled, of the platinum channel, the air supply volume and speed of the cooling air are adjusted according to cooling range of the molten glassin the platinum channel, and the equipment has high flexibility, and realizes precise cooling of the molten glass.

The invention discloses a high-adaptation truss temperature control method. The high-adaptation truss temperature control method includes that step 1, coating multi-layer thermal insulation components at the surface of a support rod of a truss; step 2, spraying intelligent coats to the surfaces of a rod hinge which do not influence the stretching of a movable component. A multi-layer thermal insulation structure comprises multi-layer thermal insulation components of multiple units, and the multi-layer thermal insulation component of each unit is composed of double-sided aluminum plated polyester films and nylon net scarves which are distributed at intervals. Each intelligent coat is made of thermotropic phase change material, the infrared emitting ability is changed along with the change of temperature, the temperature change induces phase change, and then the emitting ability is changed along with the phase change so as to keep the rod hinge at an ideal temperature. The high-adaptation truss temperature control method solves the on-track temperature control problem before and after stretching the truss, adapts to temperature needs under different external thermal flow conditions and has advantages of high adaptation, good reliability and flexible design.

The invention particularly relates to a cooling system of a permanent magnet governor. A power supply and a processing unit of the system are connected with a semiconductor refrigeration module, the cooling end of the semiconductor refrigeration module is used for cooling the conductor rotor disk of the permanent magnet speed governor, the heating end of the semiconductor refrigeration module is used for the heat derivation generated by the semiconductor refrigeration module, the first temperature sensor and the second temperature sensor are capable of transmitting the temperature informationof the eddy current side of the conductor rotor disk of the permanent magnet speed governor and the temperature information of the heating end of the semiconductor refrigeration module to the processing unit, the detection processor of the processing unit receives and processes the temperature information to obtain the real-time temperature of the vortex side of the conductor rotor disk of the permanent magnet speed governor and the real-time temperature of the heating end of the semiconductor refrigeration module, The controller compares the above temperature with a preset suitable temperature, and controls the refrigeration capacity of the refrigeration end of the semiconductor refrigeration module and the heat generation amount of the heating end of the semiconductor refrigeration module. The invention relates to an active cooling method.

The invention discloses a combined heat exchanger and a refrigerator. The heat exchanger comprises at least two heat exchange coils and radiating fins, all the heat exchange coils are overlapped, andeach heat exchange coil is an independent heat exchange pipe; and the radiating fins are arranged on the heat exchange coils. According to the heat exchanger, the plurality of heat exchange coils arearranged, and each heat exchange coils is the independent heat exchange pipe, so that different heat exchange coils can be controlled to exchange heat independently or simultaneously according to specific conditions, the refrigerating capacity is adjusted, frost layers are reduced, defrosting is convenient, and more energy is saved.

The invention discloses a water evaporative refrigeration system. Refrigeration is conducted according to the one-to-one correspondence relationship between the boiling point temperature of water andthe pressure. The water evaporative refrigeration system is mainly composed of an evaporator, a condenser and a negative pressure pumping device; the evaporator is mainly composed of a plurality of unit negative pressure cavities, an air supplying fan and an air outlet. Treated air flows in an air flue among all the unit negative pressure cavities, the interiors of the cavities can be pumped to bein different pressures according to the actual refrigeration temperature, and thus liquid water evaporates in the cavities to absorb the heat of the processed air; the negative pressure pumping device pumps out water vapor evaporated in the evaporator in time and exhausts the water vapor to the condenser, the set negative pressure in the negative pressure cavities of the evaporator can be maintained, the corresponding pressure when the water boiling point in the cavities of the condenser is equal to the environment temperature can be ensured, a valve located on a small pipeline a outside theevaporator can adjust the circulating water flow of the system, and thus the purpose of adjusting the refrigeration amount of the system is achieved indirectly.

The invention discloses refrigeration equipment with a local cooling function and a local refrigeration method. The refrigeration equipment comprises a compressor, a condenser and an evaporator whichare connected through a pipeline. The evaporator comprises a plurality of cooling mechanisms, each cooling mechanism comprises a cooling plate and a refrigerant channel fixed to the back of the cooling plate, an inlet of each refrigerant channel is communicated with the condenser through a pipeline, and an outlet of each refrigerant channel is communicated with the compressor through a pipeline. According to the refrigeration equipment with a local cooling function and the local refrigeration method, the cooling mechanisms are arranged, so that local cooling of electronic components can be achieved, and the requirements of different electronic components for temperature are met; and due to the fact that heat exchange is directly conducted, compared with a traditional refrigerating system,the heat exchange is more efficient and concentrated, the cooling speed is high, the cooling effect is more remarkable, the cooling is more targeted, useless cooling capacity is avoided, and the energy efficiency of the refrigeration equipment is improved.

The invention relates to the field of carbon dioxide compressor performance tests, in particular to a carbon dioxide compressor performance test system with a transcritical / subcritical testing function. The system involves a test loop, wherein the test loop is formed on a main pipeline together with a to-be-tested carbon dioxide compressor; and the test loop comprises a first switching valve, a second switching valve, a third switching valve and a fourth switching valve which are arranged in sequence, wherein a transcritical circulating gas cooling section and a subcritical circulating condensation section which are connected in parallel are arranged between the first switching valve and the second switching valve, a transcritical circulating evaporation section and a subcritical circulating evaporation section which are connected in parallel are arranged between the third switching valve and the fourth switching valve, and the main pipeline is further provided with an adjusting and measuring assembly. The system has the advantages that the system covers the large-scale working conditions of the carbon dioxide compressor in transcritical / subcritical circulating, so that equipment used by test equipment is reduced, and the cost is reduced; and when different circulating tests are carried out through the same machine, disassembling and assembling of the machine are not needed, sothat operation is simpler and more convenient.

The invention provides a small-size refrigerating and heating device for an automobile and relates to a refrigerating and heating device. The small-size refrigerating and heating device for the automobile comprises a refrigerating box, a heating box, a semiconductor refrigerating chip, a heat exchanger, temperature sensors, a microprocessor, a PID controller, and an adjustable power supply module. The refrigerating box and the heating box are connected with each other. The semiconductor refrigerating chip is arranged between the refrigerating box and the heating box. The heat exchanger is connected between an air supply opening and a return air opening of the heating box. The heat exchanger is respectively connected with the two ends of an automobile engine water heating system. The temperature sensors are arranged in the refrigerating box and the heating box respectively and connected with the input end of the microprocessor. The output end of the microprocessor is connected with the input end of the PID controller. The output end of the PID controller is connected with the adjustable power supply module. The output end of the adjustable power supply module is connected with the semiconductor refrigerating chip. Heat generated by an engine mainly serves as a heat source of the heating box. The refrigerating box achieves refrigeration through the semiconductor refrigerating chip. The refrigerating efficiency of the refrigerating box is improved through the microprocessor and the PID controller. Therefore, the energy utilization rate is high.

The invention provides a cooling system and a control method thereof, and relates to the technical field of semiconductor chip preparation. The cooling system comprises a control device, a bearing table and a cooling machine communicated with a bearing table pipeline through a water inlet and a water outlet, a first temperature sensor is arranged on the bearing table to collect the first temperature of the bearing table, and a second temperature sensor is arranged at the water inlet of the cooling machine to collect the second temperature of the water inlet of the cooling machine. The bearing table is used for placing a to-be-cooled chip, and the first temperature sensor, the second temperature sensor and the cooling machine are electrically connected with the control device; and the control device is used for adjusting the water amount of the water outlet of the cooling machine according to the obtained first temperature and second temperature. According to the cooling system and the control method thereof, the effect of adjusting the heat dissipation capacity of the bearing table can be achieved.

The invention discloses a single-compressor three-cold-head pulse tube refrigerator with free adjustment of input work and refrigeration capacity, including a numerically controlled AC power supply, a linear compressor, a pressure wave transmission pipeline group, an electronically controlled valve group, and a pulse tube refrigerator Cold head group, cooling water system, user-side low temperature circulation system and data acquisition and control system. The realization of the present invention provides a design and application scheme for variable power operation and adjustment of cooling capacity for a large cooling capacity low temperature system driven by a single compressor with three pulse tube cold heads, effectively solving the problem that the cooling capacity of conventional low temperature systems is difficult to follow the needs of user end equipment The problem of corresponding adjustment enables the same system to meet the needs of users with different cooling capacities, making the low-temperature system with large cooling capacity more convenient to control, stronger application scenario adaptability and higher energy efficiency ratio. For low-temperature refrigerators in smart grids, Applications in fields such as advanced electric power, rail transit, high-efficiency energy storage, and high-end communications are of very positive significance.

The invention relates to a pulse tube refrigerator in which an inertial tube and a small hole valve are jointly phase-modulated, comprising a compressor (1), a pulse tube unit (2) and a phaser, wherein the phaser comprises an inertial tube phaser (3) and the orifice valve phase modulator (4). The compressor is connected to the front end of the pulse tube unit, and the pulse tube unit includes a radiator, a regenerator, a cooling heat exchanger and a pulse tube which are connected in sequence. On the basis of , a small hole valve structure is added as a new type of composite phase modulator. Compared with the prior art, the present invention can make the pulse tube refrigerator adjust the cooling capacity in a wide temperature range, maintain high Bicano efficiency, and keep the efficiency stable.

A supercooling apparatus, comprising a supercooling unit (200). In the supercooling unit, a refrigerant passage (205) is connected to the liquid side communication pipes (21, 22) of a refrigerating device (10). When a supercooling compressor (221) is operated, a supercooling refrigerant is circulated in a supercooling refrigerant circuit (220), a refrigerating cycle is performed, and the refrigerant of the refrigerating device (10) flowing in the refrigerant passage (205) is cooled. The detected values of an atmospheric temperature sensor (231) and a refrigerant temperature sensor (236) are inputted into the controller (240) of the supercooling unit (200). The controller (240) performs the operating control of the supercooling compressor (221) based on only the information obtained in the supercooling unit (200).

The invention relates to the field of air conditioners and provides a cold water air conditioner and a cooling water unit and a cooling water control method thereof. The cooling water unit comprises acold water cooling pipeline, a unit cooling pipeline, a water pump, a cold water cooling device and an adjusting pipeline. The cold water cooling device is arranged on the cold water cooling pipeline, and the adjusting pipeline, the cold water cooling pipeline and the unit cooling pipeline are connected in parallel. The water pump is arranged on the cold water cooling pipeline, and at least of the adjusting pipeline and the unit cooling pipeline is provided with a flow adjusting valve; or the water pump is arranged on the unit cooling pipeline, and at least one of the cold water cooling pipeline and the adjusting pipeline is provided with a flow adjusting valve. The cooling degree of a condenser is controlled by controlling the unit cooling pipeline by adjusting the apertures of the flowadjusting valves, so that the condenser is prevented from being cooled excessively and a phenomenon that the pressure difference between a condensing pressure and an evaporating pressure is too low isavoided, and therefore, normal operation of a unit is kept for a long time in a low-temperature environment favorably.

The invention relates to an enhanced cooling type cabinet for a compressor. The enhanced cooling type cabinet for the compressor comprises a cabinet body, air inlets are formed in the left side and the right side of the cabinet body, a fan unit and a radiator unit are arranged in the cabinet body, the radiator unit is connected with the compressor through a pipeline, and a radiating outlet is formed in a position, corresponding to the fan unit, of the top of the cabinet body, so that the purpose of cooling the compressor is achieved, and normal operation of the compressor is ensured. An automatic adjusting device, a temperature sensor and a PLC are arranged on the radiator unit, the automatic adjusting device and the temperature sensor are electrically connected with the PLC, the temperature sensor is used for monitoring the temperature change of a pipeline and transmitting monitored real-time temperature signal values to the PLC, the PLC carries out analysis on the received temperature signal values and converts the temperature signal values into corresponding numerical values, the area, shielded by the automatic adjusting device, of the radiator unit is matched according to the temperature signal values, and therefore the heat dissipation area of the radiator unit is adjusted, the heat dissipation capacity of the radiator unit can be dynamically adjusted, and then constant-temperature and variable-temperature output of compressed gas is achieved.

An output-power-self-adapting refrigeration compressor control system which comprises a refrigeration compressor and a control system body. The refrigeration compressor is provided with a sealed shell. A machine core assembly is arranged in the shell. A motor is arranged on the machine core assembly and is provided with a stator, a rotor and a wire holder. A connection terminal I, a connection terminal VI and a connection terminal VII are arranged on the wire holder. The output-power-self-adapting refrigeration compressor control system is characterized in that the control system body comprises a PLC, a current collection module, a temperature collection module and a low-voltage control circuit; the wire holder is further provided with a connection terminal II, a connection terminal III, a connection terminal IV and a connection terminal V, the PLC is connected with the current collection module, the temperature collection module and the low-voltage control circuit in a communication mode, and the low-voltage control circuit is connected with the refrigeration compressor in a driving mode. The output-power-self-adapting refrigeration compressor control system is low in cost and convenient to operate, intelligent conversion of the three working states of the refrigeration compressor is achieved, the working efficiency of the refrigeration compressor is improved, the overall energy consumption of the refrigeration compressor is reduced, the refrigeration time is shortened, and the refrigeration efficiency is improved.

The invention discloses a piston-type variable frequency variable capacity refrigeration compressor, which comprises a crankcase and a variable capacity device. The crankcase is provided with a cylinder and a drainage groove; The seat is fixed with the crankcase, and there is a receiving hole in the connecting seat, the receiving hole communicates with the cylinder through the drainage groove, the adjusting bolt is set in the receiving hole, and the adjusting bolt is screwed to the receiving hole, and one end of the transmission shaft is the same as the output shaft of the driving motor. The shaft is fixed, the other end of the transmission shaft is slidingly connected with the adjusting bolt, and the driving motor is fixed with the connecting seat. The invention provides a piston-type variable-frequency variable-capacity refrigeration compressor, which can further adjust the cooling capacity of the compressor by adjusting the effective stroke volume of the compressor through a variable-capacity device.

The invention relates to the field of carbon dioxide compressor performance tests, in particular to a carbon dioxide compressor performance test system with a transcritical / subcritical testing function. The system involves a test loop, wherein the test loop is formed on a main pipeline together with a to-be-tested carbon dioxide compressor; and the test loop comprises a first switching valve, a second switching valve, a third switching valve and a fourth switching valve which are arranged in sequence, wherein a transcritical circulating gas cooling section and a subcritical circulating condensation section which are connected in parallel are arranged between the first switching valve and the second switching valve, a transcritical circulating evaporation section and a subcritical circulating evaporation section which are connected in parallel are arranged between the third switching valve and the fourth switching valve, and the main pipeline is further provided with an adjusting and measuring assembly. The system has the advantages that the system covers the large-scale working conditions of the carbon dioxide compressor in transcritical / subcritical circulating, so that equipment used by test equipment is reduced, and the cost is reduced; and when different circulating tests are carried out through the same machine, disassembling and assembling of the machine are not needed, sothat operation is simpler and more convenient.

The invention provides a refrigerator. The refrigerator comprises a freezing chamber, a refrigerating chamber, a cooling chamber and an air quantity adjusting part. The cooling chamber is provided with an evaporator, is located behind the freezing chamber, and is provided with a freezing air inlet leading to the freezing chamber and a refrigerating air inlet leading to the refrigerating chamber. The refrigerating air inlet is located right behind the freezing air inlet. The air quantity adjusting part is movably arranged between the freezing air inlet and the refrigerating air inlet and is configured to be controlled to move in the transverse direction of the refrigerator so as to open or close the refrigerating air inlet; and after the refrigerating air inlet is opened, the air quantity adjusting part can be controlled to move front and back to be close to or far away from the freezing air inlet so as to adjust the open area of the freezing air inlet. An air supplying structure of the refrigerator is simple, the effective volume of the refrigerating chamber is not occupied by the air supplying structure excessively, and when the refrigerating chamber stops refrigerating, no cold air is accumulated in a refrigerating air channel.