55 results about "Stirling cryocooler" patented technology

A wearable garment, such as a vest, for providing thermal conditioning, for example cooling and / or heating, to a user. The vest may be used with cryogenic temperatures. Peltier devices, pre-charged nitrogen canisters, or miniature Stirling cryocoolers may be mounted and built into the wearable or externally carried or mounted thereto. A pump, such as a vacuum diaphragm pump, causes thermally conditioned air to flow through a series of porous regenerative tubing and / or porous panels to supply conditioned air to a user of the garment. The system may use a cryocooler having a pulsating cold finger. The cryo embodiments may supply −200° C. gas through the panels or tubing. Portable systems can be carried or attached, such as HVAC, refrigeration, heating or the like. Control systems may regulate the temperature and may be adjusted by a user, for example using an input pad or a mobile device.

The utility model relates to the field of linear Stirling cryocoolers, in particular to a mover assembly of a linear Stirling cryocooler, which comprises a framework, a plurality of magnetic steels distributed along the circumferential direction are arranged on the peripheral surface of the framework; the hoop is arranged on the outer surface of the magnetic steel in a sleeving manner and is used for fixing the magnetic steel on the framework; the framework gland is arranged at the end part of the framework and is used for tightly pressing the end surface of the magnetic steel; the compression piston has the beneficial effects that the gluing groove is formed in the matching surface of the compression piston and the magnetic steel framework, glue is coated in the gluing groove, laser welding is carried out after the glue is used for bonding, the connection strength of the compression piston and the magnetic steel framework is improved, meanwhile, the rectangular groove is formed in the outer wall of the trapezoidal magnetic steel, and the two semi-circular hoops are bonded in the groove, so that the compression piston and the magnetic steel framework are more stable. The magnetic steel sheets are connected into a whole through the two semicircular hoops, radial looseness of the magnetic steel sheets is prevented, and the magnetic steel sheets are bonded through glue after being axially pressed by the magnetic steel framework gland, so that axial looseness of the magnetic steel sheets is prevented.

The invention discloses a Stirling cold storage separation type phase change material transfer device. The Stirling cold storage separation type phase change material transfer device comprises a Stirling refrigerator, a constant-temperature phase change material transfer box and a connecting and fixing cold conduction assembly. The Stirling cryocooler comprises a cold head, and the connecting and fixing cold conduction assembly comprises a cold head clamp, a first cold conduction aluminum block, a second cold conduction aluminum block, a first magnet ring and a second magnet ring, the first cold conduction aluminum block is in contact connection with the transfer box inner container, and the second cold conduction aluminum block is connected with the cold head clamp. The Stirling cryocooler is detachably connected with the constant-temperature phase-change material transfer box through a first magnet ring surrounding the first cold conduction aluminum block and a second magnet ring surrounding the second cold conduction aluminum block, and the transfer box of the transfer device is connected with the Stirling cryocooler in a magnetic adsorption mode. And after efficient cold accumulation is achieved through the Stirling cryocooler, rapid separation from the transfer box can be achieved.

The application provides an integrated Stirling cryocooler, comprising: an eccentric shaft box, having a sealed cavity filled with a gas working medium; an eccentric shaft, rotatably arranged in the sealed cavity along an axial direction, having an eccentric section and a non-eccentric section; a stator assembly, arranged along the axial direction and fixed in the sealed cavity; a rotor assembly, arranged on the non-eccentric section along the axial direction and having an air gap along the axial direction with the stator assembly; a compression connecting rod assembly, arranged in the sealed cavity and connected to the eccentric section; and an expansion connecting rod assembly, arranged in the sealed cavity and connected to the eccentric section; wherein the stator assembly and the rotor assembly form an axial flux motor arranged along the axial direction to drive the eccentric shaft to rotate along the axial direction by the rotor assembly. In the integrated Stirling cryocooler, the axial flux motor is formed by the stator assembly and the rotor assembly along the axial direction of the eccentric shaft, so that the size along the axial direction can be reduced, and the overall structure is more compact.

The spherical hinge structure comprises a connecting assembly and a plugging assembly, the connecting assembly comprises a first connecting piece and a second connecting piece, the plugging assembly comprises a first plugging piece and a second plugging piece, and a sealing ring is arranged in an annular groove of the second connecting piece, so that the sealing ring is arranged in the annular groove of the second connecting piece; the matching sizes of the sealing ring, the groove and the inner wall of the cavity are controlled to form uniform and moderate compression amount, so that local stress concentration is avoided, and the surface friction loss of the sealing ring is greatly reduced. Moreover, a floating gap exists between the plugging assembly and the connecting assembly, so that the sealing ring can automatically adjust the position relation in the moving process, the sealing ring is prevented from bearing too large lateral force, a stable working environment is provided for the sealing ring, and it is ensured that the sealing ring can still maintain reliable sealing performance under the working condition of long-term reciprocating motion.

The utility model relates to the technical field of refrigeration equipment, and discloses a Stirling cryocooler based on a built-in vibration reduction structure, which comprises a Stirling cryocooler, the outer side of the Stirling cryocooler is fixedly connected with a plurality of fixing shells, the interiors of the fixing shells are fixedly connected with springs I, one end of each spring I is fixedly connected with a sliding block, and the other end of each spring I is fixedly connected with a damping device. A limiting plate is rotatably connected to the interior of the fixing shell, a driving plate is slidably connected to the interior of the fixing shell, a connecting plate is slidably connected to the bottom of a sliding block, a damping mechanism used for damping parts is fixedly connected to the interior of the Stirling cryocooler, and the damping mechanism comprises two fixing plates. According to the utility model, tools do not need to be found and used, the time for preparing the tools is saved, the operation can be quickly completed, the device is particularly suitable for time-urgent working scenes, such as emergency maintenance, quick equipment replacement and the like, and the working efficiency is greatly improved.

The invention belongs to the technical field of aircraft thermal management, and discloses a high-power hybrid power thermal management system. Comprising a Stirling engine, a high-temperature heat pipe loop, a medium-temperature heat source loop and a low-temperature heat source loop. The Stirling engine comprises a Stirling engine and a Stirling cryocooler which are oppositely arranged, and harmonic oscillators are adopted between the Stirling engine and the Stirling cryocooler for phase modulation. One end of the Stirling engine serves as a high-temperature end to be connected with the high-temperature heat source loop; a room temperature end between the two is connected with a medium-temperature heat source loop; a temperature difference is constructed in the Stirling engine through the high-temperature heat source loop and the medium-temperature heat source loop, external heat is absorbed through the Stirling engine to generate work, and therefore corresponding cooling capacity is generated in the low-temperature heat source loop of the Stirling cryocooler.

The utility model relates to a plate spring and a Stirling cryocooler, which comprise a base circle part provided with a base circle part mounting hole; one end of each cantilever is connected with the base circle part, and the other end of each cantilever freely extends around the vertical central axis of the base circle part in the same direction. The plate spring is light in weight and small in size, the radial rigidity can be effectively improved under the condition that the ratio of the maximum stress to the axial rigidity is not greatly changed, stress distribution is more uniform when the plate spring works, and stress concentration is effectively reduced.

The utility model relates to the technical field of biomedical treatment, and particularly discloses a programmed cooling instrument which comprises a sample cavity, a Stirling cryocooler, a thermoelectric refrigeration device, a heat exchange system and a control system. The sample cavity is located in the center of the top of the programmed cooling instrument and used for storing biological samples. The sample cavity performs graded refrigeration through double refrigeration sources of the thermoelectric refrigeration device and the Stirling cryocooler, smooth transition of the double refrigeration sources is achieved through the control system, and the functions of heat transfer and heat dissipation are achieved through the heat exchange system in the refrigeration process. The utility model aims to solve the problem that the performance of the existing single refrigeration source is limited in a wide temperature range. The method is mainly used for gradually cooling the biological sample in a specific temperature area according to a preset program.

The expander assembly of the Stirling cryocooler comprises a cold finger provided with a cold finger air cylinder, a cold finger air cylinder, a cold finger air cylinder and an expander assembly, a shell of the regenerator is in clearance fit with the cold finger air cylinder; the base is connected with the cold finger, and a gas flowing cavity is formed in the base; the spring is respectively connected with the base and the regenerator shell; the expansion machine assembly further comprises a lining connected with the outer wall face of the regenerator shell. The hot end air cylinder is connected and matched with the cold finger air cylinder in a sleeved mode and connected with the inner wall face of the cold finger air cylinder, the hot end air cylinder is arranged outside the lining in a sleeved mode, and the hot end air cylinder and the lining are in clearance seal. According to the application, only the dynamic gap of the hot end cylinder and the lining needs to be sealed, and the gap between the whole regenerator shell and the whole cold finger cylinder does not need to meet the gap sealing requirement, so that the sealing length can be greatly reduced, and meanwhile, the universality between the cold finger cylinder and the regenerator is not influenced.

The invention relates to the technical field of Stirling cryocooler structures, and discloses a gas bearing device and a Stirling cryocooler, the gas bearing device is applied to a piston system of the Stirling cryocooler, and the gas bearing device comprises a fixing part, a piston body and a piston rod. The fixed part is fixedly arranged in the Stirling cryocooler; a main cavity is formed in the piston body, communicates with a high-pressure working cavity in the Stirling cryocooler and is used for forming a high-pressure gas environment. A first gap is formed between the piston body and the fixing component, and the piston rod is sleeved in an inner hole of the piston body and forms a second gap with the inner hole. The main cavity is communicated with the two gaps through a plurality of auxiliary flow channels, so that high-pressure gas forms gas lubricating films in the two gaps, oil-free supporting of the piston system is achieved, meanwhile, the piston body and the piston rod are kept at the respective central axis positions through gas thrust, and therefore the movement precision and the operation stability are improved.

The utility model discloses a nitrogen liquefaction storage system for a horizontal Stirling cryocooler process, which relates to the field of nitrogen liquefaction storage and comprises a tank body, end covers are arranged on the left side and the right side of the tank body, the end covers and the tank body are welded seamlessly, three refrigeration pipelines are arranged at the top of the tank body, and a plurality of fixing frames are connected to the top of the tank body. A mounting frame is mounted on the fixing frame, and three sets of refrigerating machines are mounted in the mounting frame and connected with a refrigerating pipeline through flange plates. According to the utility model, the plurality of refrigerators are additionally arranged on the tank body, nitrogen separated from air is liquefied by utilizing the refrigerators during use, and liquefied liquid nitrogen is stored in the tank body, so that the liquid nitrogen which is just liquefied can be directly used, and the problem that the transportation cost is increased due to repeated transportation is avoided; and the tank body is formed by seamless welding, and the liquid nitrogen is directly compressed in the tank body, so that the sealing performance of the tank body on the liquid nitrogen is improved, and leakage is avoided.

The utility model discloses a nitrogen liquefaction storage system for a double-head Stirling cryocooler process, which relates to the field of nitrogen liquefaction storage and comprises a base, a liquid nitrogen tank is connected to the top of the base, an end cover is arranged at the top of the liquid nitrogen tank, the end cover and the liquid nitrogen tank are seamlessly welded, and two groups of mounting frames are connected to the top of the end cover. A refrigerating machine is mounted on each mounting frame, and a refrigerating pipeline is connected to the top of the end cover. Nitrogen separated from air is guided into the air inlet pipe and then enters the refrigerating pipeline through the air inlet pipe, the refrigerating machine communicated with the refrigerating pipeline is used for refrigerating the nitrogen, so that the nitrogen is liquefied to form liquid nitrogen, and the liquid nitrogen is guided into the liquid nitrogen tank and can be directly used after nitrogen making. In addition, the liquid nitrogen tank and the end cover are formed in a seamless welding mode, the liquid nitrogen is directly compressed in the liquid nitrogen tank, the sealing performance of the liquid nitrogen tank to the liquid nitrogen is improved, and leakage is avoided.

The invention discloses a high-power Stirling cryocooler for a refrigerator and the refrigerator. The high-power Stirling cryocooler comprises a shell assembly, an air cylinder assembly, a piston assembly and a linear motor, wherein the air cylinder assembly and the piston assembly are arranged in the shell assembly; the air cylinder assembly comprises an integrated air cylinder, the piston assembly comprises a power piston mechanism, and the power piston mechanism comprises a power piston; the linear motor sequentially comprises an inner magnet yoke, a magnet ring and an outer magnet yoke from inside to outside in the radial direction of the linear motor, the outer magnet yoke is provided with a concave portion facing the magnet ring, the concave portion is used for winding a coil, a magnet ring bearing frame is arranged at the lower end of the magnet ring, and the magnet ring bearing frame is connected with the power piston. The linear reciprocating motion of the magnetic ring drives the magnetic ring bearing frame to do linear reciprocating motion, and then the power piston is driven to do linear reciprocating motion in the integrated air cylinder. According to the refrigerator, collaborative optimization is conducted on the structure level and the control level, so that the overall efficiency is improved, vibration noise is reduced, and efficient operation within the wide working condition range is achieved.

The invention discloses a rotary integrated Stirling cryocooler press sealing structure, which relates to the Stirling cryocooler technology, and comprises a press end cover (1), a first structural groove is formed in the sealing surface of the press end cover (1); the press end cover (1) and the crankcase (2) are connected and installed, the face, connected and installed with the press end cover (1), of the crankcase (2) is a sealing face, and the sealing face of the crankcase (2) is provided with a second structural groove; and the metal sealing wire (7) is arranged between the first structure groove and the second structure groove, and the metal sealing wire (7) extends and deforms under the action of pretightening force in the installation process of the press end cover (1) so as to achieve sealing. According to the sealing structure, the sealing reliability can be greatly improved, and the problem of sealing failure caused by bending deformation after the press end cover is fastened in an existing sealing structure is solved.

The utility model belongs to refrigerating machine technical field, concretely provides an expander, including cold finger protection cylinder and the base connected in cold finger one end, the cold finger is inlaid with the cold accumulator of sliding, the cavity that base and cold finger enclose forms is equipped with the guide piston, one end of guide piston is fixedly connected with base, the other end sliding sleeve joint has guide cylinder, guide cylinder with cold accumulator is connected. The utility model provides this kind of expander of improvement guide piston and guide cylinder's relative motion structure, make guide cylinder move forward and backward relative to piston after being subjected to gas force, carry out gas compression and expansion to refrigerate, guide piston can be integrated with expander base and process, reduce processing cost. Simultaneously still can join magnetic force spring subassembly, replace leaf spring in axial direction and carry out the location, can effectively reduce the risk of cylinder collision.

This invention provides an integrated linear Stirling refrigerator, comprising a linear compressor, an expander, and a phase adjustment mechanism. The phase adjustment mechanism includes a phase adjustment cavity formed between the moving parts of the linear compressor and the expanding compressor, enabling the moving parts of the linear compressor to move relative to the moving parts of the expanding compressor within a preset stroke, and rigidly driving the moving parts of the expanding compressor to move synchronously beyond the preset stroke. This invention achieves phase adjustment through the phase adjustment cavity between the linear compressor and the expander. The phase difference between them is achieved solely through mechanical geometric coordination, without relying on elastic elements, independent drives, or electronic control systems. This fundamentally eliminates problems such as fatigue failure and drive malfunctions, significantly improving lifespan and reliability. Furthermore, the phase difference is uniquely determined by the axial dimension of the phase adjustment cavity and is unaffected by temperature or operating conditions, solving the problem of significant refrigeration efficiency degradation in traditional pneumatic linear Stirling refrigerators under varying operating conditions.

The application provides a Stirling refrigerator, and relates to the technical field of refrigeration, which comprises an engine unit, a refrigeration unit, a room temperature heat exchange unit and an expeller unit. The engine unit is used for generating sound power by using input heat and can amplify and output sound power after receiving the sound power. The refrigeration unit is used for receiving the sound power and generating cold energy by using the sound power. The room temperature heat exchange unit is arranged between the engine unit and the refrigeration unit and is used for maintaining the temperature in a set range. The expeller unit is arranged in an intermediate cavity formed by the engine unit and the room temperature heat exchange unit and is used for transmitting sound power and adjusting the phase of a sound field. The Stirling refrigerator provided by the application is characterized in that the engine unit, the room temperature heat exchange unit and the refrigeration unit are sequentially and closely arranged, an intermediate cavity is formed in the middle of the engine unit and the room temperature heat exchange unit, and the expeller unit is arranged in the intermediate cavity. Therefore, the length of the expeller unit is shortened, the structure is more compact, the thermal deformation caused by the temperature gradient of the wall surface is reduced, and the movement reliability of the expeller unit is improved.

The utility model relates to the field of refrigerating machines, in particular to a high-degree-of-freedom rotary type refrigerating machine pushing assembly which comprises a cold finger, a cold storage device matched with the cold finger is arranged in the cold finger, and a magnetic core is connected to the cold storage device. The magnetic sleeve is installed in the cold finger and located at the position, corresponding to the magnetic core, of the inner wall of the cold finger; the rotary Stirling cryocooler has the beneficial effects that by embedding the magnetic sleeve in the cold finger and arranging the magnetic core at the end part of the piston, deflection of the relative position of the regenerator is limited, the stability of a movement assembly is improved, and meanwhile, the service life and the reliability of the rotary Stirling cryocooler can be further improved.

The utility model relates to a Stirling cryocooler sealing structure and a Stirling cryocooler, the Stirling cryocooler sealing structure comprises a first sealing flange, a second sealing flange, a third sealing flange and a fourth sealing flange, the first sealing flange is provided with a radial extension part and an axial extension part, and a first groove is arranged at the intersection of the radial extension part and the axial extension part; the second sealing flange is matched with the first sealing flange, and a second groove corresponding to the first groove in position is formed in the second sealing flange; and the sealing piece is integrally contained in a containing space defined by the first groove, the second groove and the peripheral face of the axial extending part so as to seal an axial matching gap between the axial extending part and the second sealing flange. The axial matching gap formed by matching of the parts is sealed through the sealing piece, so that the problem of internal gas leakage is solved, and the sealing effect is enhanced.

A dewar includes two coaxial openings of different sizes (e.g., to allow for interfacing with a Stirling cryocooler and a Stirling generator), a polytetrafluoroethylene or glass inner chamber (e.g., to reduce conductive heat transfer, particularly through the dewar neck), and an integrated, annular desiccant ring (e.g., for drying low-pressure, ambient air).

The utility model discloses a freeze dryer based on Stirling refrigeration. The freeze dryer comprises a first circulating pipeline, a Stirling refrigerator and a drying box, wherein a cold carrying medium is arranged in the first circulating pipeline; the Stirling cryocooler is used for providing cooling capacity for the cold carrying medium; the first circulation pipeline is connected with the drying box and the Stirling cryocooler and used for driving a cold carrying medium in the first circulation pipeline to conduct circulation conduction between the drying box and the Stirling cryocooler and conduct self-circulation conduction in the drying box, so that the interior of the drying box is cooled, and the constant temperature is kept. According to the freeze dryer based on Stirling refrigeration, the Stirling refrigerator is adopted for refrigeration, on the premise that the performance requirement of the freeze dryer is met, use of HFCs can be abandoned, emission of greenhouse gas is effectively reduced, and the freeze dryer is friendly to the environment.

The compressor comprises a compressor body and a variable-volume pressure regulating structure communicated with a back pressure cavity of the compressor body, the variable-volume pressure regulating structure is provided with a variable-volume gas storage device, and the gas storage device is communicated with the back pressure cavity. The gas storage device is used for adjusting the pressure of working medium gas in the compressor by changing the volume of the gas storage device. In addition, the invention further relates to the Stirling cryocooler adopting the compressor and a using method of the Stirling cryocooler. Mechanical adjustment of the working medium gas pressure of the Stirling cryocooler is achieved, a second adjustment dimension except motor control is provided for performance adjustment of the cryocooler, the refrigerating capacity range and the working condition adaptability of the cryocooler are greatly widened, the cryocooler can more flexibly meet different requirements of rapid cooling, deep refrigeration and the like, the motor load can be reduced, and the working efficiency of the cryocooler is improved. And the reliability of the compressor and the Stirling cryocooler is improved. An existing mature Stirling cryocooler body structure does not need to be greatly changed, only the newly-added variable-capacity pressure regulating structure needs to be communicated with an existing backpressure cavity, the implementation cost is low, and upgrading on an existing product or integration in new design is facilitated.

The utility model relates to a Stirling cryocooler rotating shaft installation structure and a Stirling cryocooler, and the Stirling cryocooler rotating shaft installation structure comprises a base which is provided with a base internal installation space; the boss is provided with a boss internal mounting space; the base and the boss are of an integrally-formed structure, and the boss is connected with the upper surface of the base and the inner mounting space of the base and the inner mounting space of the boss to be communicated with each other. A rotating shaft of the Stirling cryocooler is located in the base inner installation space and the boss inner installation space, and the upper end and the lower end of the rotating shaft are correspondingly contained in the top of the boss inner installation space and the bottom of the base inner installation space respectively. The coaxial installation precision of the rotating shaft can be guaranteed through the integrated structural design, deflection of the rotating shaft is avoided, meanwhile, the length of the rotating shaft can be shortened, and the size and weight of equipment are reduced.

The utility model discloses equipment for energy storage and fire protection of a lithium iron phosphate battery. The equipment comprises a high-vacuum heat-insulation gas cylinder, a Stirling cryocooler, a pressure sensor, a liquid inlet pipe, a liquid outlet pipe, an evacuation port, a vacuum measurement port and an inner container, the upper surface of the high-vacuum heat-insulation gas cylinder is fixedly connected with a Stirling cryocooler, the output end of the Stirling cryocooler is fixedly connected with a refrigeration adapter, the outer wall of one side of the refrigeration adapter is sleeved with a refrigeration pipe, and the output end of the refrigeration pipe is fixedly connected with an inner container; according to the utility model, a novel fire extinguishing agent storage structure is designed, liquid nitrogen is used as a fire extinguishing agent, a high-vacuum heat-insulating gas cylinder or storage tank is used as a container, and the Stirling cryocooler is arranged at the top, so that the liquid nitrogen can be permanently stored at low cost, and the fire extinguishing agent liquid nitrogen can be permanently stored by utilizing electric energy to achieve efficient fire extinguishing; meanwhile, an automatic assembly is designed, sensing assemblies such as a pressure sensor and a pneumatic valve are combined into an automatic fire extinguishing system, and remote or automatic control fire extinguishing is achieved.

The invention discloses a high-reliability low-time-drift Stirling cryocooler driving controller and method. The high-reliability low-time-drift Stirling cryocooler driving controller comprises a signal processing circuit unit and a driving circuit unit. The signal processing circuit unit is used for acquiring the refrigeration temperature in the Stirling cryocooler, comparing the refrigeration temperature with a preset temperature value to obtain a temperature deviation, and generating a PWM signal by adopting a PID control algorithm; a first input end of the driving circuit unit is used for acquiring three paths of Hall signals corresponding to three phases of the three-phase brushless direct current motor, a second input end of the driving circuit unit is connected with the signal processing circuit unit and receives a PWM signal, and the driving circuit unit generates a motor driving signal for controlling the three-phase brushless direct current motor based on the three paths of Hall signals and the PWM signal; a calibration array is arranged in the signal processing circuit unit, temperature values and calibration coefficients are stored in the calibration array, and the calibration array is used for correcting temperature drift parameters and time drift parameters of the Stirling cryocooler driving controller according to the temperature. According to the invention, the time drift characteristic of the Stirling refrigeration machine driving controller can be improved.

The utility model relates to the technical field of debugging devices, and discloses a split Stirling cryocooler debugging device which comprises an expansion machine piston, an expansion machine air cylinder is slidably connected to the outer portion of the expansion machine piston, a second flange plate is fixedly connected to the left side of the expansion machine air cylinder, and a first flange plate is detachably connected to the left side of the second flange plate. A support is fixedly connected to the left side of the first flange plate, a threaded rod is in threaded connection with the interior of the support, a flange plate frame is fixedly connected to the inner wall of the left side of the support, a corrugated hose is fixedly connected to the right side of the flange plate frame, and an expansion machine spring is fixedly connected to the left side of the expansion machine piston. An annular cavity is formed in the first flange plate, and a telescopic spring is fixedly connected to the inner wall of the left side of the annular cavity. According to the utility model, the sealing of the debugging device is realized, so that the gas leakage is prevented, and the accuracy of the detection result is improved.

The invention discloses a Stirling cryocooler which comprises a compressor provided with a plurality of thermal chambers which are independent from one another and have periodically changing volumes; the piston type expansion machine comprises a constant cold shell, a plurality of mutually independent cold cavities are formed in the constant cold shell and close to the cold end, and the cold cavities are pneumatically communicated with the hot cavities in a one-to-one correspondence mode; the hot end of each cold cavity is provided with a piston assembly, and each piston assembly comprises a pushing piston which moves periodically in the axial direction of the constant cold shell. The volume of the cold chamber is periodically changed along with the periodic movement of the pushing piston; the periodic motion of the pushing pistons of every two adjacent piston assemblies has a preset phase difference. The axial vibration of the multiple piston assemblies is mutually counteracted, so that the overall vibration is reduced, and the risk that the to-be-cooled device falls off from the cooling table due to the axial vibration of the expansion machine is avoided.

The utility model discloses a tool for mounting a connecting rod bearing of a Stirling cryocooler, and relates to the technical field of tools for assembly. The tool for mounting the connecting rod bearing of the Stirling cryocooler is used for assembling a connecting rod and a bearing and comprises a mounting base and a mounting top cover, wherein the mounting base is provided with a containing groove and a first glue guide groove, the containing groove is used for inserting a connecting rod head of a to-be-mounted bearing of a connecting rod, the first glue guide groove is formed in the groove bottom of the containing groove, and the first glue guide groove is communicated with the external environment of the mounting base and used for receiving and guiding glue overflowing from the position between the first end of the bearing and the connecting rod head to flow; the mounting top cover is provided with a guide rod, the guide rod is used for inserting the bearing, the mounting top cover can cover the top of the mounting base so that the bearing can be inserted into the connecting rod head, and when the tool is used for assembling the bearing and the connecting rod, redundant mucilage glue can be effectively prevented from permeating into the bearing.