226 results about "Cooling cycle" patented technology

The invention belongs to the technical field of ship bearings, and particularly relates to a ship bearing radial loading test bench and method for simulating ice load and water immersion working conditions, and the method comprises the steps: installing a to-be-tested intermediate bearing on a test platform, enabling the intermediate bearing to sleeve a test shaft, starting a cooling water circulation system to control the flow, cooling water enters a cooling water coil pipe to establish oil pool cooling circulation; a driving motor is started; a test shaft stably operates through equipment such as a reduction gearbox and the like; a dynamic pressure lubrication state is established, a radial dynamic load or a stable constant load is applied through a hydraulic loading system to simulate an icebreaking load working condition, and a simulated water body is injected into a water tank; the test conditions of the intermediate bearing in a ship immersion environment are constructed through water pressure adjustment, the temperatures of lubricating oil, a bearing bush and cooling water are monitored in real time, the loading force is adjusted through feedback data, and the performance of the intermediate bearing is judged after the test is finished. The problems that ice excitation and soaking environment simulation are insufficient and a loading structure is eccentric in the prior art are solved, and high-precision cooling and thermal stability evaluation are achieved.

The invention relates to the technical field of task scheduling, in particular to a task scheduling optimization system for a smelting process, which comprises a furnace temperature identification module, a hot load analysis module, a load screening module, a sorting regulation and control module and a task joint control module. According to the method, a stable operation section is screened based on thermocouple time sequence temperature difference fluctuation characteristics, task identification is ensured to be in tight fit with a real metallurgical process state, furnace profile thermal parameters and raw material attributes are introduced to dynamically estimate task thermal loads, and the heat adaptation relation between tasks and equipment is determined; safety load interval limitation is set in the screening task and furnace body combination process, the safety and matching precision of resource allocation are improved, meanwhile, cooling period limitation is embedded in task sorting to recognize delay tasks, scheduling continuity and task connection reasonability are enhanced, the capacity of a scheduling strategy for responding to actual operation constraints is improved, and the service life of the scheduling strategy is prolonged. The overall optimization of accurate task screening, reasonable load distribution and ordered scheduling sequence is realized.

The invention relates to the technical field of immersion liquid cooling control, in particular to an immersion liquid cooling data control method and system combining photovoltaic and low-temperature waste heat power generation, and the method comprises the steps: transmitting low-temperature waste heat generated by the operation of a server to a liquid cooling circulation system, capturing solar radiation energy through a synchronous photovoltaic module, forming basic energy input, and transmitting the basic energy input to a server; generating a symbiotic energy substrate; the symbiotic energy substrate drives dual-path conversion, and photovoltaic electric energy is directly supplied to a cooling system pump set and a control unit to maintain liquid cooling circulation; afterheat pushes an expansion unit to generate power through organic working medium gasification, so that energy consumption of a cooling system is supplemented, and an energy flow self-driving system is formed; operation parameters of the energy flow self-driven system are input into the control core, and a three-state strategy is dynamically executed based on the load state and photovoltaic output. The system comprises a liquid cooling cabinet, a CDU control unit, a PLC, a solar panel, a photovoltaic cell, an illumination intensity sensor, a waste heat recovery device, a mode switcher and the like. According to the invention, system operation mode switching time delay is eliminated.

The invention relates to a magnetic suspension bearing, a compressor and an air compressor, and the magnetic suspension bearing comprises a support assembly which is used for being fixedly connected with a shell of the compressor; the bearing stator assembly is mounted on the support assembly; wherein the support assembly is provided with at least one liquid cooling flow channel, and at least part of the liquid cooling flow channel is arranged opposite to the bearing stator assembly in the axial direction of the magnetic suspension bearing. According to the magnetic suspension bearing disclosed by the invention, the cooling liquid in the liquid cooling flow channel circularly flows, so that the cooling liquid exchanges heat with the support assembly which generates heat, the heat is absorbed, and the temperature of the magnetic suspension bearing is reduced. And the cooling liquid absorbing heat flows out of the flow channel, is cooled by an external heat dissipation device and then flows into the flow channel again to form continuous cooling circulation, so that the temperature of the magnetic suspension bearing is effectively controlled, and the influence of local high temperature on the performance and the service life of the compressor is avoided.

The invention relates to the field of intelligent distribution boxes, and discloses a modularized intelligent distribution box based on liquid cooling circulation, which comprises a box body and electrical elements arranged in the box body, and a liquid cooling piece is arranged in the box body; the liquid cooling piece is communicated with a circulating liquid supply mechanism buried underground; the box body is provided with a scraping mechanism for scraping liquid from the liquid-cooled part, and the liquid scraped by the scraping mechanism is discharged out of the box body; the scraping mechanism comprises a magnetic ring, and the magnetic ring magnetically acts on liquid in the liquid cooling part; a rotational flow piece which moves along with the movement of the magnetic ring is arranged in the liquid cooling piece, and the rotational flow piece moves along with the movement to scrape the inner wall of the liquid cooling piece. Condensate water on the surface of the heat exchange pipe is removed through the scraping mechanism, and the humidity in the box is controlled through inclined design of the shunting box and the collecting box, guide of the protection plate and the discharge port, so that heat exchange efficiency reduction and electric appliance insulation risks are avoided; the external scraping shell and the internal rotational flow piece are linked through the magnetic ring, the inside and outside of the pipe are synchronously cleaned, a magnetic field changes mineral crystal forms to reduce scale, turbulence scouring keeps clean, and the heat exchange effect is maintained.

The invention discloses an immersion phase change cooling device and cooling method for a net-forming type energy storage converter. The device comprises a power module phase change cooling unit, a condensation module, a liquid storage tank and a heat exchanger, the power module heating element is soaked in a refrigerant of the power module phase change cooling unit, the refrigerant absorbs heat and is heated to generate phase change vaporization, and a liquid refrigerant is converted into a gas refrigerant to be used for reducing the temperature of the power module heating element. A gaseous refrigerant flows to a condensation module, the condensation module exchanges heat with the gaseous refrigerant, so that the gaseous refrigerant is converted into a liquid refrigerant through phase change, and the liquid refrigerant flows to a heat exchanger and exchanges heat with air in the cabinet to reduce the temperature of elements in the cabinet; and the liquid refrigerant continues to flow into the power module phase change cooling unit to cool the power module, so that the immersion phase change cooling circulation process of the structure network type energy storage converter is realized. According to the invention, through phase-change heat exchange, the heat dissipation problem of sudden increase of heat consumption caused by short-time multi-time overload of the grid-forming type energy storage converter is solved, and the heat dissipation efficiency and reliability are improved.

The invention relates to the technical field of motors, and discloses an oil injection direct-cooling heat dissipation structure which is installed inside a motor, an inner cavity of the motor is provided with a stator iron core used for fixing a metal coil, an oil inlet is formed in a machine base, an oil channel is formed in the annular wall of the stator iron core, and the oil injection direct-cooling heat dissipation structure further comprises two oil injection rings symmetrically arranged on the two sides of the stator iron core; the cooled oil passing through the interior of the iron core reaches the top ends of the two sides of the oil channel, enters the oil guide pipes from the top ends and finally reaches the oil injection rings symmetrically arranged on the two sides of the stator iron core. And the oil injection ring sprays and cools the end parts of the rotor and the stator iron core coil. Therefore, the cooling oil completes the cooling task of all the key heating areas. And the cooling oil after heat exchange is collected to the bottom of the motor under the action of gravity. Collected oil liquid is subjected to heat dissipation through an external cooling system, and is pumped into the oil inlet through the oil pump after being cooled, so that a complete cooling cycle is formed.

The application provides a ship cooling device and a ship cooling system, which comprise: an air conditioner refrigeration cycle device, a urea cooling device, a first urea cooling cycle pipeline and a urea cabin; the first urea cooling cycle pipeline is drawn from a main cooling cycle pipeline of the air conditioner refrigeration cycle device and connected to the urea cooling device; the urea cabin is connected to the urea cooling device; the urea cabin is used for storing urea solution; the air conditioner refrigeration cycle device is used for forming a refrigerant cycle to provide refrigerating capacity for the ship and the urea cooling device; and the urea cooling device is used for forming a urea refrigerant cycle through the first urea cooling cycle pipeline and the air conditioner refrigeration cycle device to cool the urea solution in the urea cabin. In this way, the urea cooling device and the air conditioner refrigeration cycle device are combined together to form the ship cooling device, so that the cooling of the ship and the urea cabin under extreme temperature and environment can be realized, and cost can be saved.

The invention relates to the technical field of aviation equipment, in particular to an electric gas compressor system and a cooling method thereof.The electric gas compressor system comprises a heat insulation cover and further comprises a gas compressor, a motor, a turbine, a first heat exchanger and a second heat exchanger which are fixed in the heat insulation cover; the outlet is communicated with a hot side runner inlet of the second heat exchanger; a hot side runner outlet of the second heat exchanger is communicated with an inner cavity of a shell of the motor through a cooling air channel, and the cavity is communicated with an airflow inlet of the turbine; the air compressor, the motor, the turbine and the two-stage heat exchanger are integrated in the heat insulation cover, open type cooling circulation without an external cold source is constructed, self-cooling of the motor and a bearing is achieved, a relatively low-temperature environment is built in the heat insulation cover, and the problem that an existing electric air compressor generally lacks effective self-cooling capacity, and the service life of the air compressor is prolonged is solved. And active heat management cannot be carried out on heat-sensitive parts such as motor windings and bearings by utilizing own airflow.

This invention relates to the field of hydraulic system cooling technology and discloses a hydraulic system with multiple cooling structures, including a base plate frame. Two feet are fixedly connected to the upper surface of the base plate frame, and a cooling water tank is fixedly connected to the top of each foot. A third cooling mechanism for cooling hydraulic oil is provided inside the cooling water tank. A lower fixed plate is fixedly connected to the outer circumference of the cooling water tank, and a rotating cylinder is rotatably connected to the upper surface of the lower fixed plate. A second cooling mechanism for cooling hydraulic oil is provided inside the rotating cylinder. This invention not only enables multiple cooling cycles for the hydraulic oil, ensuring complete cooling and preventing overheating and deterioration, but also allows for more comprehensive contact between the hydraulic oil and the cooling water pipes, further improving the cooling effect of the third cooling mechanism. Furthermore, it allows for more comprehensive contact between the cooling water and the oil inlet pipe, thereby further improving the cooling effect of the second cooling mechanism.

To provide a refrigeration cycle system that can suppress malfunctions of the four-way valve at low ambient temperatures. [Solution] The refrigeration cycle device comprises a four-way valve and a control unit. The four-way valve has a compressor, an indoor heat exchanger, an expansion valve, and an outdoor heat exchanger, and switches the direction of flow of the refrigerant that is circulated by the compressor in a refrigerant circuit and connected to the refrigerant circuit. The control unit controls the compressor and switches between heating operation, in which the refrigerant is circulated in a heating cycle, cooling operation, in which the refrigerant is circulated in a cooling cycle with the opposite flow direction to the heating cycle, and defrosting operation, in which frost has formed on the outdoor heat exchanger due to heating operation is removed in the cooling cycle, by switching the four-way valve. When the control unit receives an operation stop signal and is performing defrosting operation, it stops the compressor after performing heating operation for a predetermined time or longer after the completion of defrosting operation.

The invention relates to the technical field of high-temperature gas cooled reactor cooling, in particular to a cooling circulation device, a high-temperature gas cooled reactor comprehensive cooling system and a using method. A cooling circulation device comprises a liquid inlet circulation pipeline; a liquid outlet circulation pipeline; the circulating pump set is arranged between the liquid inlet circulating pipeline and the liquid outlet circulating pipeline, one end of the liquid inlet circulating pipeline is suitable for being communicated with the first liquid inlet main pipeline, one end of the liquid outlet circulating pipeline is suitable for being communicated with the first liquid inlet main pipeline, and cooling liquid flows in the first liquid inlet main pipeline; a first valve is arranged on the first liquid inlet main pipeline between the liquid inlet circulating pipeline and the liquid outlet circulating pipeline, and the communicating position of the liquid inlet circulating pipeline and the first liquid inlet main pipeline is located on the upstream of the communicating position of the liquid outlet circulating pipeline and the first liquid inlet main pipeline. The invention provides a cooling circulation device, a high-temperature gas cooled reactor comprehensive cooling system and a use method, and aims to solve the problems that power pumps and pipelines need to be additionally arranged when each system of a reactor is in an active state, the arrangement is complicated, and the cost is increased.

The application provides a heat management method and an absorption type combined cooling and heating system, and comprises the following steps: detecting the ambient temperature in a factory building; if the ambient temperature is less than a first temperature threshold, controlling a first three-way valve, a second three-way valve, a third three-way valve, a fourth three-way valve and a four-way valve to switch to a heating switch state respectively, so that the waste heat generated by auxiliary equipment and steam waste heat are used as a heating source for driving a heating cycle, and the heating cycle is completed through a circulating working medium; if the ambient temperature is greater than a second temperature threshold, controlling the first three-way valve, the second three-way valve, the third three-way valve, the fourth three-way valve and the four-way valve to switch to a cooling switch state respectively, so that the steam waste gas and heat absorbed from cooling water in a cooling cycle are used as a heating source for driving the cooling cycle, and the cooling cycle is completed through the circulating working medium. The steam waste gas, a hot water production and distribution system and a cooling water system are integrated as a whole, and the energy utilization rate is improved by switching the operation mode of the whole system.

The present application relates to a large vacuum pump motor drive device, a control method and a suction and pressure conveying vehicle, which relates to the technical field of suction and pressure conveying vehicles, including a vacuum pump for sucking and discharging dust; a drive motor for connecting to a vehicle battery, the drive motor being connected to a vacuum pump for driving the vacuum pump to operate; a cooling mechanism, which includes an air cooler, a cooling water tank and a cooling pipe, the cooling pipe being wrapped around the drive motor and connected to the cooling water tank, the air cooler being arranged at one end of the drive motor, the cooling water tank being located between the air cooler and the drive motor, and the air cooler being used to cool the drive motor and the cooling water tank. When the temperature of the drive motor is less than a set value, the air cooler directly cools the drive motor, and when the temperature of the drive motor is greater than a set value, the coolant starts to circulate through the cooling pipe to cool the drive motor, and the air cooler cools the coolant entering the cooling water tank, thereby ensuring a cooling effect at different temperatures. At the same time, when only a small amount of cooling is required, there is no need to start the liquid cooling cycle.

The invention discloses a multi-mode switching type new energy power control cabinet with enhanced heat dissipation and moisture resistance. The multi-mode switching type new energy power control cabinet comprises a cabinet body, a heat dissipation assembly arranged in the cabinet body, a drying box and a transmission assembly, the transmission assembly comprises a toothed bar, a gear and a first telescopic suite, when the humidity is too high, the drying box moves downwards to seal the meshes to isolate moisture, the heat dissipation assembly forms efficient liquid cooling circulation to achieve cooling and dehumidification, and automatic transmission connection of the heat dissipation assembly and the drying box is completed through the first telescopic suite.

The utility model provides a water cooling mechanism for an ion implanter, which comprises a first cooling seat body, a second cooling seat body, a switching communication pipeline and an external inlet and outlet pipeline, and is provided with a first circulating water path and a second circulating water path which are arranged around the outer sides of respective avoidance ports, so that cooling water can be fully contacted and take away heat, and the service life of the water cooling mechanism is prolonged. The first cooling seat body and the second cooling seat body are efficiently cooled, then the temperature of a key component ion source of the ion implanter is effectively controlled, the first cooling seat body and the second cooling seat body are connected through the switching communication pipeline to form a complete cooling cycle, and the service life of the ion implanter is prolonged. Meanwhile, the avoiding through openings are formed in the middles of the guide connecting rod columns to contain the guide connecting rod columns, the structure is compact, the flowing path of cooling water can be reduced, the cooling efficiency is improved, the cooling device is communicated with cold water supply equipment through an external inlet and outlet pipeline, the flow and temperature of the cooling water can be adjusted according to actual needs, and the cooling requirements under different working conditions are met.

The invention discloses an aircraft wing anti-icing and de-icing PID temperature control device and method and an aircraft, and belongs to the technical field of industrial equipment de-icing equipment.The aircraft wing anti-icing and de-icing PID temperature control device comprises a heating module, a temperature collecting module, an on-off module and a PID controller, the surface of an aircraft body structure is divided into a plurality of independent areas which at least comprise a windward area and a leeward area, the windward area and the leeward area are each provided with a heating module, the PID controller is electrically connected with the temperature collecting module and the on-off module, the temperature collecting module can measure the temperature of the windward area and the temperature of the leeward area and transmit temperature signals to the PID controller, and the PID controller can control on-off of the on-off module. According to the invention, the heating zone can be controlled according to the temperature difference between the windward side and the leeward side of the machine body structure, the heating and cooling period does not need to be manually set, automatic response can be carried out along with the environment change, and the electric energy loss caused by the excessive heating of the leeward side of the machine body structure is saved.

The invention relates to the technical field of solar energy and air energy heat supply, in particular to an integrated air source heat pump and photovoltaic and photo-thermal linkage triple co-generation system and an operation method thereof.The integrated air source heat pump and photovoltaic and photo-thermal linkage triple co-generation system comprises a PVT photovoltaic module, an air source heat pump, an integrated module, a water using terminal and a heating radiator, and the PVT photovoltaic module is electrically connected with the air source heat pump; the integrated module comprises a heat exchange water tank, an energy supply water tank, a fan coil and a PVT photovoltaic module, photovoltaic power generation is supplied to the air source heat pump, the PVT photovoltaic module absorbs solar energy, converts the solar energy into heat energy, circularly heats water in the heat exchange water tank and supplies the heat energy to a water using terminal, and a water using terminal hot water mode is achieved; the air source heat pump is communicated with the energy supply water tank, a heat exchange coil pipe is arranged in the heat exchange water tank, a water inlet of the heat exchange coil pipe is connected with a host liquid supply pipe through an electric three-way valve, a water outlet of the heat exchange coil pipe is connected with a host liquid return pipe, and the air source heat pump exchanges heat to realize a winter heating mode and a summer refrigeration mode; and the energy supply water tank exchanges heat to realize a cold supply circulation mode and a heat supply circulation mode.

The application discloses an energy management system of a power cycle system, wherein the power cycle system is a combined power cycle system of a gas turbine and a fuel cell, and the energy management system comprises a fuel pump, a fuel distributor, a cold end heat exchanger, a cooling cycle loop and a hot end heat exchanger; and a control system is used for controlling the fuel pump, the fuel distributor and a circulating pump in the cooling cycle loop, wherein a fuel flow is obtained based on a required power of the power cycle system, a rotating speed of the fuel pump and an opening degree of the fuel distributor, a hot end heat exchanger heat is calculated through heat balance based on the fuel flow, and a cooling effect of the cooling cycle loop is realized based on the hot end heat exchanger heat and the rotating speed of the circulating pump. The application can simultaneously meet the energy saving and emission reduction and weight control requirements of an aircraft, and also solves the problem that the system power density is limited by the heat dissipation capacity.

This utility model discloses a self-circulating cooling water system structure, including a suction pipe, a connecting pipe at the top of the suction pipe, and a suction valve at the other end of the connecting pipe connected to the suction end of a high-pressure pump. The inner cavity of the connecting pipe is provided with a suction valve that controls the flow rate of the liquid entering and its on / off state. A connecting hole is provided at the bottom of the suction pipe and at a position corresponding to the connecting pipe. A return water connector is connected to the inner cavity of the connecting hole through a detachable component. A return water pipe is connected to the top of the return water connector. The other end of the return water pipe extends upward to below the suction end of the suction valve. Due to the arrangement of the return water pipe, when the suction valve draws water, a negative pressure area is formed below the suction end of the suction valve. One end of the return water pipe is located below this negative pressure area, and the return water pipe is connected to an external circulating water pipe through the return water connector. Under the action of negative pressure, water in the external cooling water is drawn into the return water pipe, thereby making the cooling water flow and forming a cooling cycle.

Systems and methods for a regenerative ejector-based cooling cycle that utilizes an ejector as a driving force in the cooling loop to regenerate subcooling of the refrigerant in a single-stage cooling cycle.

The application relates to the technical field of vehicles, and particularly discloses an engine cooling system, a control method, a vehicle and a storage medium, the engine cooling system comprising a first cooling cycle and a second cooling cycle, the first cooling cycle comprising a first water pump, a first pipeline and a second pipeline which are arranged in parallel and are both connected with the output end of the first water pump, an EGR cooler valve and an EGR cooler which are connected in series in the first pipeline, an oil cooler valve and an oil cooler which are connected in series in the second pipeline, and a first thermostat which is connected with the first pipeline and the second pipeline respectively, and the first outlet of the first thermostat is communicated with the input end of the first water pump; the second cooling cycle comprises a second water pump, an engine block water jacket, a cylinder head water jacket and a second thermostat which are connected in series, and the first output port of the second thermostat is communicated with the input end of the second water pump, and the temperature of the cooling liquid in the second cooling cycle of the engine cooling system can be quickly raised at the start of the engine to adapt to the starting requirement in a cold environment.

The present application aims to establish an efficient and stable cooling cycle. A cooling system for a moving body includes a compressor, a condenser, an expansion valve, an evaporator, a flow rate adjustment device that adjusts a flow rate of a cooling fluid that is guided to the condenser depending on an external environment of the moving body, an ambient temperature acquisition sensor that detects an ambient condition for acquiring an ambient temperature to which the condenser is exposed by the cooling fluid, a pressure sensor that detects a pressure of refrigerant in the condenser, a temperature sensor that detects a temperature of the refrigerant on a downstream side of the condenser, and a control unit that executes a first process of adjusting the flow rate of the cooling fluid so that the pressure of the refrigerant in the condenser is greater than a saturation pressure of the refrigerant at the ambient temperature based on an output of the ambient temperature acquisition sensor and the pressure sensor, and a second process of adjusting an opening degree of the expansion valve so that the refrigerant on the downstream side of the condenser is in a supercooled state based on an output of the pressure sensor and an output of the temperature sensor.

The present application relates to the field of material science and engineering, and particularly relates to a temperature control method, device and system for material testing. The method comprises: controlling the heating of the electric heating wire to make the temperature of the inner box rise to a first set temperature and stop heating, monitoring and recording the temperature of the inner box, and reheating at the end of the cooling process. During the repeated heating and cooling cycle, the size of the optimal temperature of the current stage and the optimal temperature of the next stage are compared within a set time length, if the optimal temperature of the current stage is less than the optimal temperature of the next stage, the temperature rise is completed by adjusting the cooling time; if the optimal temperature of the current stage is greater than the optimal temperature of the next stage, the temperature drop is completed by adjusting the cooling time and adjusting the relative angle of the sample box and the inner box. The method provided by the present application uses the characteristics of fast and stable pulse heating, slow and gradually slowing down of the temperature control, saves energy consumption, improves the stage connection process, avoids reverse heating, and reduces energy consumption.

The invention discloses a solid solution and aging treatment method for preparing an aluminum alloy with balanced strength and toughness, which comprises the following steps: placing an extruded aluminum alloy profile at 510 + / -5 DEG C for heat preservation for 1 hour, and then carrying out high-pressure nitrogen fog quenching; after solid solution, immediately immersing into liquid nitrogen for copious cooling for 1 hour, then rapidly heating to 100 DEG C, and keeping the temperature for 30 minutes; repeating the cryogenic-medium temperature circulation for three times; aging treatment is conducted after cryogenic circulation, specifically, pre-aging is conducted, treatment is conducted for 6 hours at the temperature of 90 + / -5 DEG C, and a 1T pulsed magnetic field is synchronously applied; aging for the second time, heating to 130 + / -5 DEG C, preserving heat for 5 hours, and applying a stable electric field of 50V / cm; and aging for the third time, continuously heating to 155 + / -5 DEG C, preserving heat for 10 hours, and superposing 0.5 T alternating magnetic field to obtain a finished product. Through the technical path of collaborative regulation and control of cryogenic and electromagnetic fields, the method has the outstanding advantages of accurate and controllable technological parameters, low equipment modification cost and high production line adaptability.

This application relates to the field of dry-type transformer technology, specifically disclosing an all-weather dry-type transformer, including: a tank, coils, a heat dissipation channel, and an insulating spacer; the coils are disposed inside the tank; the heat dissipation channel is disposed outside the tank; one end of the heat dissipation channel connects to the top surface of the tank, and the other end connects to the bottom of the tank; the insulating spacer is disposed inside the tank; one side of the insulating spacer connects to the inner wall of the tank, and the other side connects to the outer side of the coil, preventing airflow from passing between the coil and the tank. In this design, the heat generated by the operation of the dry-type transformer can be discharged into the heat dissipation channel through the top surface, and then the high-temperature gas is cooled by heat exchange with the outside through the heat dissipation channel; the cooled gas flows back into the tank, thus forming a natural cooling cycle. At the same time, the insulating spacer allows the circulated airflow to directly pass through the inner wall of the coil, thereby improving the heat dissipation effect.

A pneumatically driven cryogenic refrigerator, primarily operating on a Gifford-McMahon (GM) cycle, switches from cooling to heating via a switching valve between a rotary valve and a drive piston that causes the displacer to reciprocate. The rotary valve has ports at two radii: one circulates flow to the displacer, and the second circulates flow to the drive piston. Both ports circulate flow to the top of the drive piston; the "cooling" port optimizes the cooling cycle, while the "heating" port provides a good heating cycle. The switching valve that changes flow from one port to the other can be linearly or rotary actuated. The rotary valve does not reverse direction.

The utility model discloses a hydro-pneumatic spring with a heat dissipation function, and belongs to the technical field of hydro-pneumatic springs. The device comprises a hydro-pneumatic spring body, a floating piston, a one-way check valve, a cooler and a pipeline system. The floating piston achieves oil-gas isolation, the main piston divides an inner cavity of the cylinder body into a center cavity and an annular cavity, and the center cavity and the annular cavity are communicated through a piston rod damping oil channel and an external pipeline. The core innovation is that in the active cooling circulation, in the compression stroke, hot oil in a central cavity is pressed out, is forcibly guided into an external cooler through a one-way check valve to be cooled, and then is injected into an annular cavity; and in the stretching stroke, the oil flows back to the central cavity through the damping hole. By means of the structure, a double heat dissipation mechanism combining cylinder barrel convection radiation heat dissipation and oil liquid replacement convection heat dissipation is formed, the limitation that a traditional hydro-pneumatic spring only relies on a cylinder body for heat dissipation is broken through, the temperature of oil liquid and gas can be actively and efficiently controlled, temperature rise is remarkably restrained, and sealing reliability and system work stability are guaranteed.

This invention discloses a liquid-cooled microchannel powder metallurgy fabrication method, belonging to the field of radiator manufacturing technology. The invention employs a pre-stamping process to prepare copper heat dissipation fins, combined with customized spherical high-purity copper powder and composite polymer bonding particles. A uniform mixture is prepared through segmented high and low temperature and high and low speed stirring. This is then combined with metal powder injection molding, oxalic acid degreasing, nitrogen atmosphere constant temperature anti-oxidation pretreatment, and high-vacuum sintering processes, along with controllable molding and sintering parameters, to fabricate a copper liquid-cooled microchannel radiator. This invention effectively solves the problems of difficult molding of thin-walled pure copper microchannel structures, poor dimensional consistency, and susceptibility to defects and springback. It significantly improves the extrusion of copper materials in microchannel structures, the smoothness of the inner wall, and the overall density, strengthens the bond strength between the fins and the substrate, and eliminates leakage, corrosion, and heat dissipation attenuation under long-term liquid cooling cycles. The product yield is high, and the stability is excellent.