2008results about "Compression machines" patented technology

The invention provides a water working medium quasi-saturated compression high-temperature heat pump system based on an ejector, and belongs to the field of compression heat pumps. The problems that after an existing compression system flows through a throttling valve, the superheat degree of steam exhaust is large due to high-temperature lift compression, and the loss of available energy in the throttling process from condensate to a two-phase region is too large are solved. A multi-stage spraying atomization structure is adopted, a micro-nano liquid drop mist flow with the particle size controllable to be 50-200 nm and the liquid mass fraction adjustable to be 5%-10% is formed before compression, the airflow humidity regulation and control precision is remarkably improved, the quasi-saturation compression process is matched, and the thermal matching performance and the energy efficiency level of a system are effectively improved; a main flow inlet of the jet atomizer is changed into a compressor outlet from a condenser outlet, so that the response speed is increased, and meanwhile the jet atomizer is suitable for a complex variable-working-condition system; or single-stage compression is optimized into a two-stage compression form, so that higher heating temperature and more stable system operation are realized; or liquid from a lower-pressure position is injected, so that the injection capacity is improved.

The invention discloses a multifunctional integrated gas control system for a dilution refrigerator, and particularly relates to the field of refrigeration and low-temperature engineering, which comprises a liquid nitrogen cold trap, a gas buffer tank, an integrated valve box, a dilution refrigeration internal circulation pipeline, a diaphragm compressor, a roots pump, a turbo molecular pump and a vacuum suction pump set. According to the system, a highly-integrated valve box module is used and is responsible for implementing gas circuit control on different stages such as dilution refrigeration cycle starting, operation and shutdown rewarming; according to the invention, conductance optimization and heat loss reduction are carried out on gas paths with different temperature zones and different pressures, high air tightness of a full temperature zone from room temperature to extremely low temperature is ensured, the reliability and the automation degree of the dilution refrigerating machine are improved, and very positive significance is provided for practicability of a dilution refrigerating system.

The invention discloses an offshore multi-energy combined supply system based on constant-pressure compressed carbon dioxide energy storage and an operation method of the offshore multi-energy combined supply system. The system comprises a working medium storage device, a heat energy storage device, a charging process module, a gas-liquid conversion loop, a discharging process module, a cold energy supply module and a heat energy supply module. By improving the energy release process structure of the compressed carbon dioxide energy storage system, the pressure of high-pressure carbon dioxide is reduced to normal pressure after primary expansion, so that low-temperature cold energy is generated while power is generated, consumption of stored heat is saved, residual stored heat is used for heat supply, the comprehensive utilization rate of energy is increased, and combined supply of cooling, heating and power is achieved; the system further comprises an integrated thermally-driven combined cooling and power supply subsystem capable of switching power generation / refrigeration modes, organic Rankine cycle and jet refrigeration cycle are highly integrated, investment cost and space occupation are reduced, redundant heat energy is flexibly and efficiently converted into electric energy or cold energy, and the flexibility of multi-energy combined supply of the system is improved.

The condensation pump type dilution refrigerating machine with the booster pump comprises the pre-cooling module and the dilution module, the pre-cooling module provides the required pre-cooling temperature for the dilution module, the dilution module uses the booster pump working at 1K, 3He circulation is achieved through cooperation of the booster pump and the condensation pump, no room-temperature circulation system is arranged, and therefore the dilution effect is good. And the defects of high heat loss and high compression power consumption in a room temperature circulation mode are overcome. Meanwhile, due to the fact that the booster pump is used, the system can obtain larger circulating flow so as to achieve larger cooling capacity, and the defect that a condensation pump type dilution refrigerator obtains large refrigerating power is overcome.

The utility model relates to a small-sized low-temperature gas purification and pressure control device which comprises a particulate matter filter, a pressure buffer tank, a pressure controller, a purifier and a parallel gas conveying pipeline, the parallel gas conveying pipeline is divided into a gas inlet channel, a flow dividing channel, a purifying channel, a connecting channel, a refrigerating channel and a gas outlet channel through valve assemblies. According to the utility model, unnecessary parts are omitted, and only the particulate matter filter, the pressure buffer tank, the pressure controller, the purifier and the parallel gas conveying pipeline are reserved, so that the volume of the equipment is effectively reduced while the gas purity and the pressure stability are ensured, and the whole structure is more compact; and three different lines are arranged to carry out pipeline purging, gas leakage detection and gas conveying work respectively, so that normal operation of the refrigerating machine is guaranteed, the service life of a product is greatly prolonged, and the reliability of the product is greatly improved.

The present application provides a two-phase cold plate liquid cooling system and a control method. According to the present application, for parts which are cooled in series by the two-phase cold plate liquid cooling system, after a first evaporator cools a previous part, on the basis of the heat transfer requirements of a part cooled by a second evaporator, the quality of a refrigerant output from the first evaporator is adjusted to prevent the quality of the refrigerant from being too low or too high, and thus the refrigerant entering the second evaporator has proper quality, namely, the refrigerant entering the second evaporator has proper boiling point and heat exchange capacity, so that corresponding parts can be cooled to proper temperature, and large temperature difference between upstream and downstream parts is avoided. The solution solves the problem of the temperature of downstream parts in the series being lower than the temperature of upstream parts in the series, improves the temperature uniformity of multiple parts cooled in series, and then solves the problems of pressure oscillation, circulation stagnation and circulation reverse flow in the system, greatly improving the temperature uniformity of heat sources connected in series and the reliability of a series-parallel system.

The invention provides a 3He internal circulation device for a dilution refrigerator and the dilution refrigerator, and relates to the technical field of dilution refrigerators. The dilution refrigerator is provided with a mixing chamber and an evaporation chamber, the 3He internal circulation device comprises at least one pair of circulation main bodies and a driving mechanism, the at least one pair of circulation main bodies are arranged between a first-stage cold disc and a second-stage cold disc which are distributed at intervals in the vertical direction, the temperature of the first-stage cold disc is located in a first temperature zone, and the temperature of the second-stage cold disc is located in a second temperature zone; each circulating main body has a first state in which the circulating main body moves downwards to be in contact with the second-stage cold disc, is cooled to a second temperature zone and adsorbs 3He steam from the evaporation chamber, and a second state in which the circulating main body moves upwards to be in contact with the first-stage cold disc, is heated to the first temperature zone and releases the 3He steam to the mixing chamber. The driving mechanism is suitable for driving the two circulating main bodies in each pair to move in the vertical direction so as to be switched between a first state and a second state, and the two circulating main bodies are kept in different states so as to form a 3He steam inner circulating passage.

The invention discloses a two-section compression type transcritical carbon dioxide heat pump system and a control method thereof. An outlet of a second compressor sequentially passes through a high-temperature heat exchanger and a flow divider and then is divided into two paths; wherein one path is communicated with an inlet of a first expansion machine through a heat flow stream inlet valve of the first heat regenerator, the hot side of the first heat regenerator and the hot side of the second heat regenerator, and the other path is communicated with an inlet of a second expansion machine through a heat flow stream inlet valve of the third heat regenerator and the hot side of the third heat regenerator in sequence; the outlet of the second expansion machine is communicated with the inlet of the mixer through the cold side of the second heat regenerator, the cold stream inlet valve of the first heat regenerator and the cold side of the second heat regenerator in sequence; an outlet of the first expansion machine communicates with an inlet of the mixer through the low-temperature heat exchanger, a cold stream inlet valve of the third heat regenerator, the cold side of the third heat regenerator and the first compressor, an outlet of the mixer communicates with an inlet of the second compressor, and the comprehensive energy efficiency of the carbon dioxide heat pump system can be improved.

Connection adapter for docking and undocking a maintenance station to a service valve of a third-party system in which a working fluid circulates in a closed circuit with a connection via which for filling working fluid under pressure can be fed from the maintenance station into the connection adapter or via which working fluid under pressure can be discharged, with a dead space which is ventilated via a venting path, the connection adapter includes a servo space in which a servo piston for opening and closing the venting path is accommodated, and a valve spindle that operates a valve element, and a hold-down device for opening a spring valve insert forming the service valve, which is designed and arranged in such a way that it only opens the spring valve insert after the servo piston has reached a position closing the ventilation path.

The utility model provides a liquid carbon dioxide energy storage refrigerating system. The liquid carbon dioxide energy storage refrigerating system comprises an energy storage system, a refrigerating system and a heat circulation system. The energy storage system comprises a low-pressure liquid storage tank, a first throttling pressure reducing valve, a first heat exchanger, a compressor, a second heat exchanger and a high-pressure liquid storage tank which are sequentially connected in a sealed mode. The refrigerating system comprises a high-pressure liquid storage tank, a second throttling pressure reducing valve, a third heat exchanger, a fourth heat exchanger and a low-pressure liquid storage tank which are sequentially connected in a sealed mode. The heat circulation system comprises a cold storage tank, the cold storage tank is coupled with the first heat exchanger through a circulation pipeline, and the cold storage tank is coupled with the fourth heat exchanger through a circulation pipeline. In the low peak period of electricity utilization, the electric energy is stored in the form of high-pressure liquid carbon dioxide. And the liquid carbon dioxide is gasified and cooled through pressure reduction of the second throttling pressure reducing valve so as to provide cold energy. And meanwhile, cold energy generated in the refrigeration process can be stored through the heat circulation system and used for cooling carbon dioxide in the energy storage process.

A heat pump system for a vehicle is configured to perform cooling or heating of the vehicle interior by using a natural refrigerant, and efficiently adjust the temperature of the battery module by using a single chiller that heat-exchanges refrigerant and coolant.

The invention discloses a through-type heat exchanger for controlling heat leakage between different last cold stages of a dilution refrigerator and a manufacturing method, and particularly relates to the technical field of refrigeration and low-temperature engineering, the through-type heat exchanger comprises an inlet connecting pipe, an annular upper sealing plate, a heat exchanger shell, an annular lower sealing plate, an outlet connecting pipe and a metal sintering body, an inner wall face fixing step is fixedly arranged on the inner wall of the heat exchanger shell, the inner wall face fixing step is close to an opening in the bottom end of the heat exchanger shell, the metal sintering body is arranged in the heat exchanger shell and is tightly matched with the heat exchanger shell, and the length of the metal sintering body is slightly smaller than that of the heat exchanger shell. By arranging the metal sintering body, the heat exchange area is increased to the maximum extent within the limited volume, the porosity and the specific surface area of the metal sintering body are reasonably set, and therefore stable flowing and diffusion of the helium-3 / helium-4 mixed working medium are achieved.

The invention relates to the technical field of dilution refrigerators, in particular to a liquid-helium-free dilution refrigerator with a rapid precooling inner cavity structure, which comprises a first rack and a second rack, a top plate is fixedly mounted at the top of the second rack, a top cover is fixedly arranged on the top plate, and a shell assembly is fixedly mounted at the bottom of the top cover. A multi-layer vacuum cavity assembly used for providing a vacuum environment is arranged in the shell assembly, a dilution refrigeration unit and an inner cavity mechanism assembly are arranged on the multi-layer vacuum cavity assembly, and the inner cavity mechanism assembly, the top cover and the multi-layer vacuum cavity assembly are jointly provided with an adjustable inflation and deflation mechanism used for adjusting an air inlet and outlet mode. Through cooperative use of the driving mechanism and the step-by-step regulation and control assembly in the adjustable inflation and deflation mechanism, switching of air inlet and outlet modes is achieved, mode switching of air inlet and outlet through a single through hole and simultaneous air inlet and outlet through multiple vent holes is achieved, and different working modes can be conveniently switched according to actual needs.

The air inlet and return pipe comprises an air inlet and return pipe body and end nuts connected to the two ends of the air inlet and return pipe body, the air inlet and return pipe body is of a bilateral symmetry structure, and internal threads are arranged on the inner circumferential surfaces of the end nuts connected to the two ends; the air inlet and return pipe body is of a double-layer structure, the outer layer is a woven mesh made of stainless steel, and the inner layer is a fluoroplastic hose. End supports are respectively arranged at the joints of the two ends of the air inlet and return pipe main body and the end nuts, and are used for connecting the air inlet and return pipe main body and the end nuts; the length of the end portions of the two sides of the fluoroplastic hose is slightly larger than that of the woven mesh, and a turnup structure is formed at the end supporting position so that a sealing structure can be formed when the end nut is in threaded connection with other parts, the flexibility of the air inlet and return pipe of the pulse tube refrigerator is guaranteed, vibration can be greatly reduced, meanwhile, gas flow resistance is reduced, and working efficiency and refrigerating capacity are improved.

The invention relates to the technical field of waste heat recovery equipment, in particular to a sintering rotary furnace waste heat composite recovery structure which comprises a rotary furnace body, a boiler body, an energy saver and a flue gas treatment device. The two ends of the economizer are connected with a boiler body flue and the flue gas treatment device respectively, the flue gas treatment device comprises a compression cavity, a piston, a driving device, a water outlet, an exhaust port, a vortex tube and a recovery cavity, the compression cavity is communicated with the economizer through a throat pipe, the piston is located in the compression cavity and forms a moving pair with the compression cavity, and the driving device can drive the piston to move. The water outlet and the exhaust port are communicated with the compression cavity, the recovery cavity surrounds the outside of the compression cavity and is communicated with the hot air outlet of the vortex tube, four-time waste heat recovery is achieved through mutual cooperation of all the components, and the waste heat recovery efficiency is high.

[Problem] Reduction of the stirring resistance that arises in a motor in a coolant circulation system in which an oil-containing coolant circulates to cool and lubricate the motor.[Means of solution] A coolant circulation system 100 comprises: a motor 4 with a rotor 41, a stator 42, a rotating shaft 43 and plain bearings 44; a gas-liquid separator 12, which separates a coolant into CO2 and oil; a CO2 passage 22b, through which the CO2 separated by the gas-liquid separator is supplied to a gap between the rotor and the stator to cool the rotor and the stator; mixing channels 24a, through which a mixture of the CO2 and the oil, obtained by mixing the CO2 and the oil separated by the gas-liquid separator, is supplied to gaps between the rotating shaft and the plain bearings to lubricate the plain bearings; and mixing channels 24b, through which the CO2 supplied to the rotor and the stator from the CO2 channel 22b and the mixture of CO2 and oil supplied to the sliding bearings 44 from the mixing channels 24a are returned to the gas-liquid separator.

A refrigerant circulation system configured to circulate oil-containing CO2 refrigerant includes a compressor, a motor, an oil tank, first to third passages, a flow regulating valve provided to the first and / or second passages, a motor rotational speed sensor, and a controller which controls the flow regulating valve(s). The refrigerant supplied from the compressor flows through the first passage, the oil supplied from the oil tank flows through the second passage. The motor includes a rotation shaft coupled to a rotor, and slide bearings which are lubricated using liquefied refrigerant compressed by the compressor and support the rotation shaft. The third passage communicates the first passage with the second passage and supplies to the slide bearings the refrigerant mixed with the oil. The controller controls the flow regulating valve according to the detected rotational speed to change a proportion of the oil in the refrigerant supplied to the slide bearings.

The invention discloses an air suspension turbine power generation and refrigeration integrated device which comprises a shell, a stator and a rotor spindle, the rotor spindle is rotationally arranged in the shell through a bearing assembly, the stator is fixed in the shell and is coaxial with the rotor spindle, and an air gap exists between the stator and the rotor spindle to form a permanent magnet synchronous generator. The rotor further comprises a first-stage volute, a second-stage volute, a first-stage radial flow turbine, a second-stage radial flow turbine, a volute connecting pipe and a cooling water jacket, the first-stage volute and the second-stage volute are fixed to the two ends of the shell respectively, and the first-stage radial flow turbine and the second-stage radial flow turbine are coaxially fixed to the two ends of the rotor spindle respectively and are arranged back to back; the first-stage radial flow turbine is located in the first-stage volute, the second-stage radial flow turbine is located in the second-stage volute, the first-stage volute is provided with a high-temperature and high-pressure air inlet and a first-stage air outlet, and the second-stage volute is provided with a second-stage air inlet and an expansion cooling air exhaust port; the device has the advantages of being capable of stably running at a high speed in a high-altitude low-pressure environment and simultaneously achieving efficient power generation and refrigeration functions.

The invention relates to the technical field of energy-saving air conditioners, in particular to a control method and device of a refrigerating system and the refrigerating system.The control method comprises the following steps that a time-of-use electricity price table of the next 24 hours is obtained, the upper limit and the lower limit of an indoor comfortable temperature interval set by a user are read, quantified building thermodynamic parameters are called, and a set of electricity price weights and indoor temperature constraints is established. According to the method, the time-of-use electricity price in the next 24 hours and the upper and lower limits of the indoor comfortable temperature interval set by the user are introduced in the refrigeration operation process of the compressor, the electricity price factor is combined with the thermodynamic dynamic response constraint, an economical optimization path of compressor power output is constructed, start-stop control logic purely oriented by demands is avoided, and the energy consumption is reduced. And on the basis of power regulation and control, the temperature difference between the coil temperature of the outdoor heat exchanger and the environment temperature is collected, the motor current of an outdoor fan is monitored at the same time, dynamic frost judgment logic is established, a static threshold judgment mode is replaced, and the compressor has the real-time sensing capacity in the operation process.

To provide a working medium for heat cycle which has less influence over the ozone layer, which has less influence over global warming and which provides a heat cycle system excellent in the cycle performance (the efficiency and the capacity), and a heat cycle system excellent in the cycle performance (the efficiency and the capacity). A working medium for heat cycle comprising 1,2-difluoroethylene is employed for a heat cycle system (such as a Rankine cycle system, a heat pump cycle system, a refrigerating cycle system 10 or a heat transport system).

The utility model provides a carbon dioxide heat pump control cabinet self-cooling system which comprises a carbon dioxide heat pump loop which comprises a compression device, a cooling device, a throttling device and an evaporation device which are mutually connected through a first pipeline, carbon dioxide is cooled to a preset temperature area in the cooling device, and the cooling device is provided with a first inlet and a first outlet; the compression device comprises a second inlet and a second outlet. The carbon dioxide heat pump loop further comprises a first section located between the first outlet and the second inlet and a second section located between the second outlet and the first inlet. And the cooling loop comprises a control cabinet heat exchange part and a second pipeline, the control cabinet heat exchange part is connected between the first outlet and the second inlet through the second pipeline and connected with the first section in parallel, and the control cabinet heat exchange part is used for making contact with the control cabinet for heat exchange. Based on the working loop of the carbon dioxide heat pump, the cooling loop is added, and the control cabinet is effectively cooled by utilizing the high-efficiency heat exchange characteristic of the carbon dioxide heat pump.

To provide a gas-liquid heat exchanger suitable for heat transport using thermoacoustic self-excited vibration.SOLUTION: A member 1 for a gas-liquid heat exchanger includes a body part 11 in which heat is exchanged between air introduced to inside and liquid introduced to inside, and the body part 11 has a shape of an approximately columnar body that has a first bottom surface 111 and a second bottom surface 112 disposed approximately in parallel with each other and that includes a plurality of holes 113 linearly communicating both of the bottom surfaces with each other. Gas G is introduced to the plurality of holes 113, and the plurality of holes are provided approximately in parallel in the height direction of the body part 11 (first direction D1) and are provided to form a plurality of rows along a predetermined direction approximately orthogonal to the first direction (second direction D2). The body part 11 has a shape including a plurality of slits 118 to which liquid is introduced. The slits 118 are linearly provided between the plurality of rows from one end side of the row in the body part 11 to the other end of the row of the body part 11 so as not to intersect with the holes 113.SELECTED DRAWING: Figure 1

A compressor unit of a cryocooler includes: a compressor motor; an inverter that converts, into drive power of the compressor motor, AC power input to the compressor unit from an external power source; a transformer that converts the AC power into drive power of a cold head of the cryocooler of which a voltage is different from a voltage of the AC power, and a control panel on which the inverter and the transformer are mounted.

The invention discloses air treatment equipment and a control method. The air treatment equipment comprises a first matching pipeline, a first control pipeline, a first heat exchange unit, a water vapor compressor, a second heat exchange unit and a throttling component, wherein the first heat exchange unit, the water vapor compressor, the second heat exchange unit and the throttling component are sequentially connected. At least one of the first matching pipeline and the first control pipeline is provided with a first flow control component. The water vapor compressor comprises a shell, the shell is internally provided with a bearing sleeve and a stator, and the bearing sleeve is internally provided with a first cooling cavity; the rotor shaft is located in the shell and penetrates through the bearing sleeve and the stator; the bearing is sleeved between the bearing sleeve and the rotor shaft; the compression unit is arranged at the end part of the rotor shaft; on the basis of opening of the first flow control component, the first control pipeline is arranged to form fluid flowing from the first heat exchange unit to the first cooling cavity, and the first matching pipeline is arranged to form fluid flowing from the first cooling cavity to the first heat exchange unit. According to the scheme, a cooling device for cooling the water vapor compressor does not need to be additionally arranged, and the structure is simpler.

The invention provides a pulse tube refrigerator. The pulse tube refrigerator comprises a compressor, a cold head and a flexible connecting tube. And the flexible connecting pipe is connected between the compressor and the cold head. The compressor converts electric energy into acoustic power of gas, the flexible connecting pipe conveys the acoustic power of the gas output by the compressor to the cold head, and the cold head generates cooling capacity through the acoustic power of the gas in the power-heat conversion process. According to the pulse tube refrigerator, the compressor and the cold head are connected through the flexible connecting tube, compared with a hard connecting tube, the flexible connecting tube can better isolate vibration of the compressor, the vibration of the compressor can be effectively prevented from being transmitted to the cold head through the flexible connecting tube, after the cold head is connected with an infrared camera, vibration of an infrared chip of the infrared camera can be reduced, and the service life of the infrared camera is prolonged. And the imaging effect is improved. Moreover, the flexible connecting pipe is deformable, so that the cold head can move relative to the compressor, and therefore, when the infrared camera is focused, the cold head can move along with the infrared focal plane.

An air conditioning system includes a rotation driving device, an energy storage device for powering the rotation driving device, a generator electrically connected to the energy storage device, and a turboexpander. The turboexpander includes a drive shaft coupled to both the generator and the rotation driving device, and configured to be rotated by the rotation driving device. The turboexpander also includes a compressor wheel and an expander wheel. The compressor wheel is configured to pull in ambient air and generate pressurized air from the ambient air responsive to rotation of the drive shaft. The expander wheel is fluidly coupled to the compressor wheel such that the pressurized air from the compressor wheel is configured to be received in the expander wheel and converted into expanded and cooled air by the expander wheel for delivery to an environment.

The utility model discloses a low-concentration carbon dioxide feed gas recovery device which comprises a residual cold recoverer A, a residual cold recoverer B and a rectifying tower, low-concentration carbon dioxide raw materials are subjected to primary residual cold recovery through the residual cold recoverer A and the residual cold recoverer B and then are overheated and fed into the rectifying tower; liquid carbon dioxide in the rectifying tower flows out from a liquid carbon dioxide outlet formed in the bottom, and non-condensable gas in the rectifying tower flows out from a non-condensable gas outlet formed in the top to a residual cold recoverer B and a residual cold recoverer A for further residual cold recovery. The low-concentration carbon dioxide in the feed gas can be effectively recovered, the process is simple, the number of equipment is small, and the cost is low.

A cold storage material according to an embodiment contains a rare earth aluminum oxide containing at least one rare earth element selected from the group consisting of Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu, in which a Group 1 element is contained in an amount of 0.001 atom % or more and 10 atom % or less, and a maximum volumetric specific heat value in a temperature range of 2 K or more and 10 K or less is 0.5 J / (cm3·K) or more.

A superconducting magnet device (100) comprises: a superconducting coil device (110) provided with a superconducting coil (112) and a current introduction line (114) connected to the superconducting coil (112); a cryogenic device (120) that is provided with at least one cryogenic refrigerator (10) and that cools the superconducting coil device (110); at least one temperature sensor (130) provided to the superconducting coil device (110) or the cryogenic device (120); and a controller (140) configured to set a temperature target value on the basis of a state parameter pertaining to the superconducting magnet device (100), determine an operating parameter of the cryogenic refrigerator (10) on the basis of a comparison between a measured temperature from the temperature sensor (130) and the temperature target value, and operate the cryogenic refrigerator (10) using the determined operating parameter.

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.