Abstract

Disclosed are a cold storage material and a cold storage type cryogenic refrigerator using same. The cold storage material is tin alloy particles, the content of tin in the tin alloy particle is not less than 40% and not more than 99%, and the cold storage material at least includes one component of bismuth, antimony, silver and gold. The cold storage type cryogenic refrigerator includes a cold storage device, and the cold storage material filled in the cold storage device is tin alloy particles, is lead-free, lowly toxic, easy in spherization and extremely accessible and has a relatively good thermal performance, has properties comparable to those of lead, and has a relatively good heat exchange performance when being used in a cold storage type refrigerator.

IPC Classes  ?

• F25B 9/14 - Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle
• C22C 13/02 - Alloys based on tin with antimony or bismuth as the next major constituent
• B22F 1/05 - Metallic powder characterised by the size or surface area of the particles
• B22F 1/065 - Spherical particles
• B22F 1/00 - Metallic powderTreatment of metallic powder, e.g. to facilitate working or to improve properties

Abstract

A self-pressure-relief air distribution mechanism includes an air distribution valve (6) where a rear face of the air distribution valve (6) is divided into a high-pressure face (66) and a low-pressure face (65), each hermetically separated by a third sealing ring (b3) that seals the air distribution valve (6) and a cover (2). A low-pressure passage (22) of the cover (2) can communicate with the rear face of the air distribution valve (6) via a pressure-relief hole (61), to guide a low-pressure airflow in the cover (2) to the rear face of the air distribution valve (6). A cryogenic refrigerator includes the self-pressure-relief air distribution mechanism. With the provision of the pressure-relief hole (61) and the third sealing ring (b3), the self-pressure-relief air distribution mechanism has a reduced pressure receiving area, thereby reducing a positive acting force and reducing wear.

IPC Classes  ?

• F25B 9/14 - Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle
• F25B 41/20 - Disposition of valves, e.g. of on-off valves or flow control valves
• F16K 11/074 - Multiple-way valves, e.g. mixing valvesPipe fittings incorporating such valvesArrangement of valves and flow lines specially adapted for mixing fluid with all movable sealing faces moving as one unit comprising only sliding valves with pivoted closure members with flat sealing faces
• F16K 47/04 - Means in valves for absorbing fluid energy for decreasing pressure, the throttle being incorporated in the closure member

Abstract

a3) is tightly attached to a switching plane (73) on the rotary valve (7), and the switching plane (73) protrudes from the rotary valve (7); the air distribution valve (6) is fixedly mounted in a mounting chamber of a cover (2), and the rotary valve (7) is rotatable around a principal rotation axis O of the rotary valve relative to the air distribution valve (6) to switch connection states of an air distribution side flow path and a switching side flow path. The cryogenic refrigerator includes the air distribution mechanism. The air distribution mechanism can avoid performing surface treatment on the rotary valve 7 to reduce costs, and only the rotary valve 7 is a moving component, to ensure the device stability.

IPC Classes  ?

• F25B 9/14 - Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle
• F25B 41/20 - Disposition of valves, e.g. of on-off valves or flow control valves

Abstract

Disclosed are a cold storage material and a cold storage type cryogenic refrigerator using same, wherein the cold storage material is tin alloy particles, and the content of tin in the tin alloy particle is no less than 40% and no more than 99%, and the cold storage material at least comprises one component of bismuth, antimony, silver and gold. The cold storage type cryogenic refrigerator comprises a cold storage device, and the cold storage material filled in the cold storage device is tin alloy particles, is free of lead, of a low toxicity, easily spherized and very easily obtained, and has a better thermal performance, has properties comparable to those of lead, and has a better heat exchange performance when being used in a cold storage type refrigerator.

IPC Classes  ?

• F25B 9/14 - Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle

Abstract

A high-reliability low-temperature refrigerating machine, comprising a compressor (1), a cover assembly (2), an air distribution valve (6), a rotating valve (7), a motor (12), a cylinder (13), and an annular groove (23), a low pressure air discharge hole (24) in communication with the annular groove (23) being disposed on the cover assembly (2) at the position of the annular groove (23), and the outlet end of the low pressure air discharge hole (24) being connected to the low pressure side of the compressor by means of a low pressure air suction pipeline (1b); a low pressure channel (73) capable of communicating with the annular groove (23) is arranged on the rotating valve (7), the other end of the low pressure channel (73) being in communication with a low pressure groove (71) on the rotating valve (7), and powder produced by the relative movement of the rotating valve (7) and the air distribution valve (6) being carried away by low pressure return air and being directly discharged by means of the low pressure air discharge hole (24).

IPC Classes  ?

• F25B 9/14 - Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle
• F25B 41/04 - Disposition of valves

Abstract

A partition component for a cold accumulator and a low-temperature refrigerator adopting the partition component. The partition component (30) comprises an annular body (31), a damping element (32), a filter assembly (33), and an annular snap ring (34). The annular body (31) is a groove with a central opening. The annular body (31) is used for accommodating the filter assembly (33). A projecting part of the annular snap ring (34) is embedded into the groove for pressing the filter assembly (33). The damping element (32) for embedding the partition component (30) into a cold accumulator barrel (12d) is embedded between the annular body (31) and the annular snap ring (34). The outer diameter of the damping element (32) is greater than the inner diameter of the cold accumulator barrel (12d). The partition component (30) is in interference fit to the inner diameter of the cold accumulator barrel (12d). The low-temperature refrigerator comprises a cold accumulator with a built-in partition component (30).

IPC Classes  ?

• F25B 9/14 - Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle
• F25B 43/00 - Arrangements for separating or purifying gases or liquidsArrangements for vaporising the residuum of liquid refrigerant, e.g. by heat

Abstract

Disclosed is an air cylinder (13). A spiral groove (1321) is disposed on an outer surface of a cylinder body of the air cylinder (13); a thickness of the bottom of the spiral groove (1321) is less than a thickness of a circumferential edge (1322) of the cylinder body of the air cylinder (13); and the circumferential edge (1322) of the cylinder body constitutes a reinforcing rib spirally and continuously wounded on the cylinder body of the air cylinder (13). Further disclosed is a cryogenic refrigerating machine comprising the air cylinder (13). A spiral groove is disposed on the outer surface of the cylinder body; the thickness of the bottom of the spiral groove is less than the thickness of the circumferential edge of the cylinder body of the air cylinder; and the circumferential edge of the cylinder body constitutes a reinforcing rib spirally and continuously wounded on the cylinder body of the air cylinder; thus, the contradiction of the strength of the cylinder body of the air cylinder and heat leakage with the thickness of the cylinder body is solved and the air cylinder has the characteristics of high strength, low heat leakage and good workability.

IPC Classes  ?

• F25B 9/14 - Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle
• F16J 10/02 - Cylinders designed to receive moving pistons or plungers

Abstract

Disclosed are a pushing piston and a corresponding cryogenic refrigerator. The pushing piston is provided with a gas passage and an exhaust port (12b). An annular groove (6) located on the outer surface of the pushing piston is formed at the position of the exhaust port (12b). The gas passage is divided by the annular groove (6) into a first gas passage (4) on the high temperature side and a second gas passage (5) on the low temperature side. The outer diameter D1 of the region on the pushing piston corresponding to the first gas passage (4) is greater than the outer diameter D2 of the region on the pushing piston corresponding to the second gas passage (5), and D2 is greater than the outer diameter D3 of the region on the pushing piston corresponding to the annular groove (6). The cryogenic refrigerator comprises the pushing piston. According to the present invention, due to the structural form of the annular groove, airflow discharged from the exhaust port to the exterior can be homogenized, the heat exchange capacity of the refrigerator can be improved, and in addition, the reduction of refrigerating capacity and the instability of cooling temperature due to sealing instability can be suppressed.

IPC Classes  ?

• F25B 9/14 - Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle
• F25B 9/00 - Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point

Abstract

A gas distributing mechanism and a corresponding cryogenic cooler. The gas distributing mechanism comprises a gas distributing valve (6) and a rotary valve (7). The gas distributing valve (6) comprises a gas distributing valve body (6a) and a gas distributing valve base (6b). A gas distributing plane (6a3) on the gas distributing valve body (6a) facing away from the gas distributing valve base (6b) is protrudingly provided relative to the gas distributing valve base (6b). The gas distributing plane (6a3) is tightly affixed to a switching plane (73) on the rotary valve (7) and the switching plane (73) is provided as protruding the rotary valve (7). The gas distributing valve (6) is fixedly mounted in a mounting cavity of a cover body (2) and the rotary valve (7) can rotate around the main axis of rotation (O) thereof relative to the gas distributing valve (6), thus switching a connection state between a gas distributing-side flow path and a switching-side flow path. The cryogenic cooler comprises the gas distributing mechanism. The gas distributing mechanism obviates the need for a surface treatment of the rotary valve (7), thus reducing costs, and, with only the rotary valve (7) being a moving part, equipment stability is ensured.

IPC Classes  ?

• F25B 9/14 - Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle
• F16K 11/074 - Multiple-way valves, e.g. mixing valvesPipe fittings incorporating such valvesArrangement of valves and flow lines specially adapted for mixing fluid with all movable sealing faces moving as one unit comprising only sliding valves with pivoted closure members with flat sealing faces

Abstract

Disclosed are a self-pressure-relief air distribution mechanism and a corresponding cryogenic refrigerator. The self-pressure-relief air distribution mechanism comprises an air distribution valve (6) and a rotating valve (7), wherein a rear face of the air distribution valve (6) is divided into a high-pressure face (66) and a low-pressure face (65), and the high-pressure face (66) and the low-pressure face (65) are hermetically separated by a third seal ring (b3) that seals the air distribution valve (6) and a cover (2); and the air distribution valve (6) is provided with a pressure-relief hole (61) that axially penetrates an air distribution face (64) and the low-pressure face (65) of the air distribution valve (6), and a low-pressure passage (22) of the cover (2) can be in communication with the rear face of the air distribution valve (6) via the pressure-relief hole (61) to guide a low-pressure airflow in the cover (2) to the rear face of the air distribution valve (6). The cryogenic refrigerator comprises the self-pressure-relief air distribution mechanism. With the provision of the pressure-relief hole (61) and the third seal ring (b3), the self-pressure-relief air distribution mechanism has a reduced pressure area, thereby reducing the positive acting force and reducing wear.

IPC Classes  ?

• F25B 9/14 - Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle
• F16K 11/074 - Multiple-way valves, e.g. mixing valvesPipe fittings incorporating such valvesArrangement of valves and flow lines specially adapted for mixing fluid with all movable sealing faces moving as one unit comprising only sliding valves with pivoted closure members with flat sealing faces

Abstract

A low-temperature device for separating and purifying gas based on a small-sized low-temperature refrigerating machine includes a primary, secondary and quaternary heat exchanger, at least one small-sized low-temperature refrigerating machine, and at least one liquid collecting tank. The small-sized low-temperature refrigerating machine includes a first cold head and a second cold head, the secondary heat exchanger is provided on the first cold head to form a primary cold head heat exchanger, the quaternary heat exchanger is provided on the second cold head to form a secondary cold head heat exchanger, a mixed gas outlet is connected to an inlet of the primary cold head heat exchanger. By using primary and secondary cold heads of the small-sized low-temperature refrigerating machine as cold sources, gases having different condensing temperature are liquefied and solidified separately, and two or more gases can be separated and purified at a lower cost.

IPC Classes  ?

• F25J 1/00 - Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
• F25J 3/08 - Separating gaseous impurities from gases or gaseous mixtures
• F25J 3/06 - Processes or apparatus for separating the constituents of gaseous mixtures involving the use of liquefaction or solidification by partial condensation
• F25B 9/02 - Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point using Joule-Thompson effectCompression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point using vortex effect
• F25B 9/14 - Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle

Abstract

A pulse tube refrigerator with an automatic gas flow and phase regulating device is composed by a helium compressor, an air distribution valve, a drive controller, a drive lead, a temperature sensor, a temperature measuring lead, a heat regenerator, a first-stage pulse tube, a second-stage pulse tube, a first-stage air reservoir and a second-stage air reservoir, wherein the air distribution valve is consisted of eight independent valves. According to received temperature signals from the temperature sensors the drive controller transmits order signals to the eight independent valves so as to control the open/close degree, time and sequence of the eight valves of the air distribution valve.

IPC Classes  ?

• F25B 9/00 - Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
• F25B 9/14 - Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the cycle used, e.g. Stirling cycle

Abstract

A low-temperature device for separating and purifying gas based on a small-sized low-temperature refrigerating machine comprises a primary heat exchanger, a secondary heat exchanger, a quaternary heat exchanger, at least one small-sized low-temperature refrigerating machine, and at least one liquid collecting tank. The small-sized low-temperature refrigerating machine comprises a first cold head and a second cold head; the secondary heat exchanger is arranged on the first cold head to form a primary cold head heat exchanger; the quaternary heat exchanger is arranged on the second cold head to form a secondary cold head heat exchanger; a mixed gas outlet is connected with an inlet of the primary cold head heat exchanger; an outlet of the primary cold head heat exchanger is connected with an inlet of the liquid collecting tank; and a gas outlet of the liquid collecting tank is connected with an inlet of the secondary cold head heat exchanger. By adopting the primary and secondary cold heads of the small-sized low-temperature refrigerating machine as cold sources, the gases with different condensing temperatures are liquefied and solidified respectively, accordingly high-purity gas at a lower condensing temperature is obtained, and two or more gases can be separated and purified at a lower cost.

IPC Classes  ?

• F25J 3/08 - Separating gaseous impurities from gases or gaseous mixtures
• F25J 5/00 - Arrangements of cold-exchangers or cold-accumulators in separation or liquefaction plants