EP3627069A1 - Freezer, and support structure for extending/retracting member - Google Patents
Freezer, and support structure for extending/retracting member Download PDFInfo
- Publication number
- EP3627069A1 EP3627069A1 EP18802005.1A EP18802005A EP3627069A1 EP 3627069 A1 EP3627069 A1 EP 3627069A1 EP 18802005 A EP18802005 A EP 18802005A EP 3627069 A1 EP3627069 A1 EP 3627069A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- extending
- retracting
- connection portion
- cylinder
- prescribed direction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/14—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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
- F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2309/00—Gas cycle refrigeration machines
- F25B2309/001—Gas cycle refrigeration machines with a linear configuration or a linear motor
Definitions
- the present invention relates to a cryocooler, and a support structure for an extending/retracting member.
- a cryocooler includes a container filled with a refrigerant, and an extending/retracting member capable of extending and retracting in an axial direction.
- a support structure for supporting the extending/retracting member support structures disclosed in PTL 1 and PTL 2 are known.
- a piston serving as the extending/retracting member is supported by a ball bearing.
- the piston serving as the extending/retracting member is supported by a spiral leaf spring.
- vibration is generated by rolling of the ball bearing.
- the support structure is adopted for the cryocooler mounted on space devices, there is a problem in that the vibration affects each device in the cryocooler.
- the vibration caused by the ball bearing can be suppressed.
- the piston may be misaligned in a radial direction.
- the present invention aims to provide a cryocooler, and a support structure for an extending/retracting member that can suppress vibration and can correspond to lengthening of the extending/retracting member.
- a cryocooler including a container filled with a refrigerant, an extending/retracting member capable of extending and retracting in a prescribed direction, and a support member that supports the extending/retracting member to be capable of extending and retracting in the prescribed direction, and that restricts movement in a perpendicular direction perpendicular to the prescribed direction.
- the support member includes a first connection portion connected to the extending/retracting member, a second connection portion connected to the container, and a deformation portion extending in the prescribed direction, having one end connected to the first connection portion, having the other end connected to the second connection portion, and deforming in the prescribed direction.
- the deformation portion includes a member having a bent plate shape or cylindrical shape.
- the cryocooler includes the support member that supports the extending/retracting member to be capable of extending and retracting in the prescribed direction, and that restricts the movement in the perpendicular direction perpendicular to the prescribed direction.
- the support member configured in this way includes the first connection portion connected to the extending/retracting member, the second connection portion connected to the container, and the deformation portion that extends in the prescribed direction, one end connected to the first connection portion, and the other end connected to the second connection portion, and that deforms in the prescribed direction.
- the deformation portion includes the member having the bent plate shape or cylindrical shape.
- the member having the bent plate shape or cylindrical shape of the deformation portion stretches via the first connection portion. Therefore, vibration caused by a ball bearing can be suppressed.
- a plate-shaped or cylindrical member deforms between the first connection portion connected to the extending/retracting member and the second connection portion fixed to the container. Accordingly, compared to a spiral leaf spring, it is possible to suppress a decrease in rigidity which is caused by extending and retracting of the extending/retracting member. Therefore, even when a stroke is lengthened, it is possible to suppress misalignment of the extending/retracting member in a radial direction. According to the above-described configuration, it is possible to suppress the vibration, and it is possible to correspond to lengthening of the extending/retracting member.
- the deformation portion may be provided to surround the extending/retracting member when viewed in the prescribed direction. In this manner, it is possible to sufficiently support the extending/retracting member. Accordingly, it is possible to further suppress the decreases in the rigidity which is caused by extending and retracting of the extending/retracting member.
- the deformation portion may include a plurality of plate-shaped members that are curved or bent.
- Each of the plate-shaped members may be curved or bent, when viewed in a circumferential direction with reference to a center axis extending in the prescribed direction of the extending/retracting member.
- the plate-shaped members that are curved or bent can stretch in the prescribed direction. Accordingly, it is possible to support the extending/retracting member.
- the cryocooler may further include a piston fixed to the container.
- the extending/retracting member may be a cylinder that accommodates the piston.
- the support member may be disposed in both ends of the cylinder in the prescribed direction. In this manner, the cylinder serving as the extending/retracting member can be sufficiently supported by the support member in both ends of the cylinder.
- the cryocooler may further include a coil that generates a force for enabling the extending/retracting member to extend and retract.
- the deformation portion may be formed of a conductive material and may supply electric power to the coil. In this manner, the deformation portion can also be used as a member for supplying the electric power to the coil.
- the deformation portion may include a plurality of plate-shaped members that are curved or bent.
- the plate-shaped member may be formed of a material in which rigidity in a first direction in a plane direction is different from rigidity in a second direction perpendicular to the first direction in the plane direction.
- the deformation portion is aligned so that a low rigidity direction corresponds to the prescribed direction and a high rigidity direction corresponds to the perpendicular direction. Accordingly, it is possible to sufficiently restrict the movement of the extending/retracting member in perpendicular direction.
- a support structure for an extending/retracting member which includes an extending/retracting member capable of extending and retracting in a prescribed direction, and a support member that supports the extending/retracting member to be capable of extending and retracting in the prescribed direction, and that restricts movement in a perpendicular direction perpendicular to the prescribed direction.
- the support member includes a first connection portion connected to the extending/retracting member, a second connection portion connected to a prescribed member, and a deformation portion extending in the prescribed direction, having one end connected to the first connection portion, having the other end connected to the second connection portion, and deforming in the prescribed direction.
- the deformation portion includes a member having a bent plate shape or cylindrical shape.
- a cryocooler and a support structure for an extending/retracting member that can suppress vibration and can correspond to lengthening of the extending/retracting member.
- a cryocooler 1 is a Stirling cryocooler using a so-called Stirling cycle, and is a small cryocooler that generates a cooling temperature of approximately 80 K, for example.
- the cryocooler 1 includes a gas compressor 2, a cold head 3, and a capillary tube 4 that connects both of these to each other.
- the cryocooler 1 is internally filled with refrigerant gas (refrigerant) used for a freezing operation.
- refrigerant gas refrigerant
- helium gas can be used as the refrigerant gas.
- the gas compressor 2 adopts a support structure 50 for an extending/retracting member according to the present embodiment.
- the gas compressor 2 according to the present embodiment has a symmetric configuration with reference to a center position in an axial direction (prescribed direction) in which a center axis CL extends. Therefore, unless otherwise described, only one side configuration in the axial direction will be described. In addition, a side closer to the center position in the axial direction will be referred to as "inward in the axial direction", and a side closer to both ends will be referred to as "outward in the axial direction”.
- a direction closer to or away from the center axis CL which is a perpendicular direction perpendicular to the center axis CL will be referred to as a "radial direction”.
- a side away from the center axis CL in the radial direction will be referred to as an "outer peripheral side in the radial direction”
- a side closer to the center axis CL will be referred to as an “inner peripheral side in the radial direction”.
- a direction around the center axis CL will be referred to as a "circumferential direction”. As illustrated in Figs.
- the gas compressor 2 includes a container 10, a cylinder (extending/retracting member) 6, a piston 7, a yoke 8, and support members 9A and 9B.
- a support structure 50 for the extending/retracting member is configured to include the cylinder 6 and the support members 9A and 9B.
- the container 10 has a substantially cylindrical shape extending in the axial direction around the center axis CL, and is internally filled with the above-described refrigerant gas.
- a partition member 5 spreading around the center axis is disposed at a center position of the container 10 in the axial direction.
- the cylinder 6 constitutes the extending/retracting member capable of extending and retracting in the axial direction. That is, the cylinder 6 can reciprocate along the axial direction.
- the cylinder 6 is accommodated outside in the axial direction from the partition member 5 inside the container 10, and has a substantially cylindrical shape extending in the axial direction around the center axis CL.
- the cylinder 6 according to the present embodiment includes a cylindrical portion 31 having a cylindrical shape, a partition portion 32 that spreads across the radial direction at an intermediate position in the axial direction inside the cylindrical portion 31, and a coil support portion 33 that is disposed in the vicinity of an outer end portion of the cylindrical portion 31 in the axial direction, and that supports a coil 36 (to be described later) .
- a tip end side of the coil support portion 33 has the coil 36 that extends in the radial direction from an outer peripheral surface of the cylindrical portion 31, and that extends inward in the axial direction after being bent.
- the piston 7 is fixed to the container 10.
- the piston 7 is a columnar member extending outward in the axial direction around the center axis CL from the center position of the container 10.
- An outer end surface of the piston 7 in the axial direction is accommodated inside the cylindrical portion 31 of the cylinder 6, and faces the partition portion 32 to be away from each other in the axial direction.
- a compression/expansion space N is formed between the piston 7 and the cylinder 6.
- a volume of the compression/expansion space N increases or decreases as the cylinder 6 extends or retracts, thereby expanding and compressing the refrigerant gas in response thereto.
- the piston 7 has a flow path 7a penetrating along the center axis CL and a flow path 7b penetrating from the flow path 7a in the radial direction at the center position in the axial direction.
- the flow path 7b communicates with a flow path 5a formed inside the partition member 5 and extending in the radial direction.
- the flow path 5a communicates with a flow path 4a of the capillary tube 4. In this manner, the refrigerant gas compressed in the compression/expansion space N is supplied to the cold head 3 via the flow paths 7a, 7b, 5a, and 4a.
- the yoke 8 is a double cylindrical member disposed on the outer peripheral side in the radial direction from the cylindrical portion 31 of the cylinder 6.
- the yoke 8 is fixed to an inner peripheral surface of the container 10, and is provided to surround the cylindrical portion 31 of the cylinder 6.
- the yoke 8 has a groove portion 8a extending inward in the axial direction from the outer end portion in the axial direction.
- a permanent magnet 34 is formed on an outer peripheral surface on the outer peripheral side of the groove portion 8a in the radial direction. In this manner, the yoke 8 forms a magnetic circuit together with the permanent magnet 34.
- the coil 36 supported by the coil support portion 33 of the cylinder 6 is disposed in the groove portion 3a of the yoke 8 from the outside toward the inside in the axial direction. In this manner, the coil 36 is disposed inside the groove portion 3a to face the inner peripheral side of the permanent magnet 34.
- the coil 36 is excited to generate a force for causing the cylinder 6 serving as the extending/retracting member to extend and retract by using an operation of the permanent magnet 34.
- the support member 9A supports the cylinder 6 serving as the extending/retracting member to be capable of extending and retracting in the axial direction, and restricts movement in the perpendicular direction (radial direction and circumferential direction) perpendicular to the axial direction.
- the support member 9A includes a first connection portion 41A connected to the cylinder 6, a second connection portion 42A connected to the container 10, and a deformation portion 40A extending in the axial direction, having one end connected to the first connection portion 41A, having the other end connected to the second connection portion, and deforming in the axial direction.
- the first connection portion 41A is connected to the outer end portion of the cylinder 6 in the axial direction.
- connection portion 42A is disposed to face the first connection portion 41A while being separated outward in the axial direction.
- the first connection portion 41A and the second connection portion 42A are configured to include a plate-shaped member having an annular shape formed around the center axis CL, or a plate-shaped member having a disc shape.
- the deformation portion 40A is configured to include a bent plate-shaped member.
- the deformation portion 40A is configured to include a plurality of plate-shaped members that are curved.
- each of the plate-shaped members is curved when viewed in the circumferential direction with reference to the center axis CL.
- the deformation portion 40A is configured so that the plate-shaped member extending in a strip shape is curved into a C-shape in cross section.
- the plate-shaped member is formed in an elongated rectangular shape.
- the plate-shaped member is folded so that front and rear planar portions are curved.
- the plate-shaped member is formed of a material having elastic anisotropy.
- the plate-shaped member is formed of a material in which rigidity in a longitudinal direction (first direction) in a plane direction and rigidity in a short direction (second direction) in the plane direction are different from each other.
- the rigidity in the longitudinal direction is low, and the rigidity in the short direction is high.
- single crystal metal is used as this material.
- Examples of applicable single crystal metal include Fe-Mn-Si alloy, Cu-Al-Mn alloy, and Cu-Al-Ni alloy.
- Cu-Al-Ni alloy is adopted which is excellent in both elastic anisotropy and super-elasticity.
- the deformation portion 40A may be formed of a conductive material.
- the deformation portion 40A is likely to deform in the longitudinal direction (axial direction in an assembly character). On the other hand, the deformation portion 40A maintains its shape without deforming in the short direction (perpendicular direction perpendicular to the axial direction).
- the outer end portion of the deformation portion 40A in the axial direction is connected to the second connection portion 42A, and the inner end portion is connected to the first connection portion 41A.
- the deformation portion 40A is connected to an outer peripheral edge portion of the first connection portion 41A and the second connection portion 42A.
- Each plate-shaped member of the deformation portion 40A is curved when viewed in the circumferential direction with reference to the axial direction.
- the deformation portion 40A is curved to protrude toward the inner peripheral side in the radial direction.
- a plurality of the deformation parts 40A are provided to surround the cylinder 6 when viewed in the axial direction.
- the plurality of deformation parts 40A may be disposed at an equal angle around the center axis CL.
- the number of the deformation parts 40A is not particularly limited. According to the above-described configuration, the deformation portion 40A deforms in the axial direction. On the other hand, the deformation portion 40A maintains its shape without deforming in the perpendicular direction perpendicular to the axial direction. That is, the support member 9A can support the cylinder 6 be capable of extending and retracting in the axial direction, and can restrict movement in the perpendicular direction perpendicular to the axial direction.
- the support member 9A can function as an energizing member for supplying electricity to the coil 36.
- the support member 9B includes a first connection portion 41B connected to the cylinder 6, a second connection portion 42B connected to the container 10, and a deformation portion 40B extending in the axial direction, having one end connected to the first connection portion 41B, having the other end connected to the second connection portion 42B, and deforming in the axial direction.
- the first connection portion 41B is connected to the inner end portion of the cylinder 6 in the axial direction.
- the second connection portion 42B is disposed to face the first connection portion 41B while being separated inward in the axial direction.
- the first connection portion 41B, the second connection portion 42B, and the deformation portion 40B have the same configurations as the first connection portion 41A, the second connection portion 42A, and the deformation portion 40A.
- the cold head 3 includes a casing 21, a cylinder 22, a displacer 23, a support rod 27, and a coil spring 25.
- the casing 21 having a substantially columnar shape internally communicates with the flow path 4a inside the capillary tube 4, and the refrigerant gas is fed into the casing 21 through the capillary tube 4.
- the cylinder 22 is a substantially cylindrical member disposed to protrude from the casing 21. A tip (end that protrudes from the casing 21) of the cylinder 22 is closed. The cylinder 22 internally has a space that communicates with the inside of the casing 21. In addition, the displacer 23 extending along the cylinder 22 is inserted into the cylinder 22.
- An expansion space M is formed on a tip end side of the cylinder 22 by an inner wall of the cylinder 22 and the displacer 23.
- the refrigerant gas inside the casing 21 flows into the expansion space M through a gas flow path 24 formed inside the displacer 23.
- the gas flow path 24 inside the displacer 23 is filled with a regenerator material 26.
- the displacer 23 is supported by the support rod 27 that extends in a protruding direction of the cylinder 22 inside the casing 21.
- the support rod 27 is supported by a bearing support portion 28 and a bearing 29 which are disposed inside the casing 21, and the bearing 29 supports the displacer 23 to be movable in the protruding direction of the cylinder 22 via the support rod 27.
- the coil spring 25 is disposed in the casing 21 to be wound around the support rod 27. One end of the coil spring 25 is attached to the support rod 27, and the other end is attached to the bearing support portion 28.
- the coil spring 25 applies an elastic force in a direction in which the displacer 23 returns to an initial position, in a case where the displacer 23 is moved due to a flow of the refrigerant gas.
- the pair of the cylinders 6 reciprocates along the axial direction by energizing the coil 36. That is, the pair of the cylinders 6 moves closer to each other in the axial direction, thereby reducing the compression/expansion space N and compressing the refrigerant gas inside the space. In addition, the pair of the cylinders 6 moves away from each other in the axial direction, thereby enlarging the compression/expansion space N and expanding the refrigerant gas inside the space.
- the cryocooler 1 includes the support members 9A and 9B that support the cylinder 6 serving as the extending/retracting member to be capable of extending and retracting in the axial direction, and that restrict the movement in the perpendicular direction perpendicular to the axial direction.
- the support members 9A and 9B configured in this way have the first connection portions 41A and 41B connected to the extending/retracting member, the second connection portions 42A and 42B connected to the container 10, and the deformation parts 40A and 40B extending in the axial direction, having one end connected to the first connection portions 41A and 41B, having the other end connected to the second connection portions 42A and 42B, and deforming in the axial direction.
- the deformation parts 40A and 40B are configured to include the bent plate-shaped member. According to the support structure 50, in response to extending and retracting of the cylinder 6, the bent plate-shaped member of the deformation parts 40A and 40B stretches via the first connection portions 41A and 41B. Therefore, vibration caused by a ball bearing can be suppressed. In addition, in the deformation parts 40A and 40B, the plate-shaped member deforms between the first connection portions 41A and 41B connected to the cylinder 6 and the second connection portions 42A and 42B fixed to the container 10. Therefore, compared to the spiral leaf spring, it is possible to suppress a decrease in the rigidity which is caused by extending and retracting of the cylinder 6.
- the deformation parts 40A and 40B are provided to surround the cylinder 6 when viewed in the axial direction. In this manner, it is possible to sufficiently support the cylinder 6. Accordingly, it is possible to further suppress the decreases in the rigidity which is caused by extending and retracting of the cylinder 6.
- the deformation parts 40A and 40B are configured to include the plurality of plate-shaped members that are curved, and each of the plate-shaped members is curved when viewed in the circumferential direction with reference to the center axis CL extending in the axial direction of the cylinder 6. In this manner, in response to extending and retracting of the cylinder 6, the plate-shaped member that is curved or bent stretches in the axial direction. Accordingly, the cylinder 6 can be supported.
- the cryocooler 1 further includes the piston 7 fixed to the container 10.
- the cylinder 6 accommodates the piston 7, and the support members 9A and 9B are disposed in both ends of the cylinder 6 in the axial direction. In this manner, the cylinder 6 serving as the extending/retracting member can be sufficiently supported by the support member in both ends of the cylinder 6.
- the cryocooler 1 further includes the coil 36 that generates the force for the cylinder 6 to extend and retract.
- the deformation parts 40A and 40B are formed of the conductive material, and supply the electric power to the coil 36. In this manner, the deformation parts 40A and 40B can also be used as a member for supplying the electric power to the coil 36.
- the deformation parts 40A and 40B are configured to include the plurality of plate-shaped members that are bent.
- the plate-shaped member is formed of the material in which the rigidity in the first direction in the plane direction and the rigidity in the second direction perpendicular to the first direction in the plane direction are different from each other.
- the deformation parts 40A and 40B are aligned so that a low rigidity direction corresponds to the prescribed direction and a high rigidity direction corresponds to the perpendicular direction. Accordingly, it is possible to sufficiently restrict the movement of the cylinder 6 in perpendicular direction.
- the support structure 50 for the extending/retracting member includes the cylinder 6 serving as the extending/retracting member capable of extending and retracting in the axial direction, and the support members 9A and 9B that support the cylinder 6 to be capable of extending and retracting in the axial direction, and that restrict the movement in the perpendicular direction perpendicular to the axial direction.
- the support members 9A and 9B include the first connection portions 41A and 41B connected to the cylinder 6, the second connection portions 42A and 42B connected to the container (prescribed member) 10, and the deformation parts 40A and 40B extending in the axial direction, having one end connected to the first connection portions 41A and 41B, having the other end connected to the second connection portions 42A and 42B, and deforming in the axial direction.
- the deformation parts 40A and 40B are configured to include the bent plate-shaped member.
- the same operation and advantageous effect as those of the above-described cryocooler 1 can be achieved.
- the present invention is not limited to the above-described embodiment.
- the above-described embodiment adopts the cylinder as the extending/retracting member.
- a piston may be adopted as the extending/retracting member.
- the gas compressor 2 of a cryocooler 100 includes a cylinder 106 fixed to the container 10, and a piston 107 capable of extending and retracting.
- the cylinder 106 is disposed in the vicinity of a center position of the container 10 in the axial direction.
- the cylinder 106 has the compression/expansion space N that communicates with the flow path 5a of the partition member 5 to accommodate the piston 107.
- the piston 107 includes a piston member 131 to be accommodated in the compression/expansion space N of the cylinder 106, a piston rod 132 connected to the piston member 131 and extending in the axial direction, and a coil support portion 133 disposed in the vicinity of an outer end portion of the piston rod 132 in the axial direction.
- the outer end portion of the piston rod 132 in the axial direction is connected to the first connection portion 41A of the support member 9A.
- a position of the piston rod 132 between the yoke 8 and the cylinder 106 is connected to the first connection portion 41B of the support member 9B.
- a through-hole is formed in the second connection portion 42B, and the piston rod 132 is inserted into the through-hole.
- the support structure for the extending/retracting member is applied to the gas compressor 2.
- the support structure for the extending/retracting member may be applied to the cold head 3.
- the configuration of the deformation portion of the support member is not limited to the above-described embodiment, and can be modified as appropriate within the scope not departing from the gist of the present invention.
- a deformation portion 153 configured to include a bent plate-shaped member may be adopted.
- a curved form or the number of curved times of the plate-shaped member is not particularly limited.
- a deformation portion 163 configured to include a plate-shaped member curved twice in a substantially S-shape may be adopted.
- a deformation portion 173 configured to include a bent cylindrical member may be adopted.
- the deformation portion 173 may be configured to include a bellows that is a cylindrical member bent in multiple stages.
- a curved cylindrical member may be adopted as the deformation part.
- a bent or curved form of the plate-shaped member is not particularly limited.
- a slit may be inserted into one plate-shaped member so as to form bifurcated portions 181 and 182.
- one bifurcated portion 181 may be curved or bent to one side in the axial direction
- the other bifurcated portion 182 may be curved or bent to the other side in the axial direction.
- a shape of the plate-shaped member configuring the deformation portion is not particularly limited, and other shapes in addition to the rectangular shape may be adopted.
- an edge portion may be curved so that the vicinity of the center position in the longitudinal direction is recessed.
- a spring constant may be adjusted by adjusting the shape of the plate-shaped member itself.
- a member that generates an elastic force may not be only the deformation part.
- a coil spring may be additionally used.
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Abstract
Description
- The present invention relates to a cryocooler, and a support structure for an extending/retracting member.
- A cryocooler includes a container filled with a refrigerant, and an extending/retracting member capable of extending and retracting in an axial direction. As a support structure for supporting the extending/retracting member, support structures disclosed in PTL 1 and
PTL 2 are known. According to the support structure disclosed in PTL 1, a piston serving as the extending/retracting member is supported by a ball bearing. According to the support structure disclosed inPTL 2, the piston serving as the extending/retracting member is supported by a spiral leaf spring. -
- [PTL 1] Japanese Unexamined Patent Publication No.
2013-185750 - [PTL 2] Japanese Unexamined Patent Publication No.
H5-288419 - In a case of the support structure disclosed in PTL 1 as described above, vibration is generated by rolling of the ball bearing. For example, in a case where the support structure is adopted for the cryocooler mounted on space devices, there is a problem in that the vibration affects each device in the cryocooler. On the other hand, in a case of the support structure disclosed in
PTL 2 as described above, the vibration caused by the ball bearing can be suppressed. However, in a case where the spiral leaf spring is used, there is a possibility that the piston may be misaligned in a radial direction. That is, when the piston moves to compressed air side and the leaf spring greatly deforms, rigidity of the leaf spring decreases, thereby causing the possibility that the piston may be misaligned in the radial direction. Therefore, there is a problem in that a stroke of the piston cannot be lengthened. - Therefore, the present invention aims to provide a cryocooler, and a support structure for an extending/retracting member that can suppress vibration and can correspond to lengthening of the extending/retracting member.
- According to an aspect of the present invention, in order to solve the above-described problem, there is provided a cryocooler including a container filled with a refrigerant, an extending/retracting member capable of extending and retracting in a prescribed direction, and a support member that supports the extending/retracting member to be capable of extending and retracting in the prescribed direction, and that restricts movement in a perpendicular direction perpendicular to the prescribed direction. The support member includes a first connection portion connected to the extending/retracting member, a second connection portion connected to the container, and a deformation portion extending in the prescribed direction, having one end connected to the first connection portion, having the other end connected to the second connection portion, and deforming in the prescribed direction. The deformation portion includes a member having a bent plate shape or cylindrical shape.
- The cryocooler according to the aspect of the present invention, the cryocooler includes the support member that supports the extending/retracting member to be capable of extending and retracting in the prescribed direction, and that restricts the movement in the perpendicular direction perpendicular to the prescribed direction. The support member configured in this way includes the first connection portion connected to the extending/retracting member, the second connection portion connected to the container, and the deformation portion that extends in the prescribed direction, one end connected to the first connection portion, and the other end connected to the second connection portion, and that deforms in the prescribed direction. In addition, the deformation portion includes the member having the bent plate shape or cylindrical shape. According to this support structure, in response to extending and retracting of the extending/retracting member, the member having the bent plate shape or cylindrical shape of the deformation portion stretches via the first connection portion. Therefore, vibration caused by a ball bearing can be suppressed. In addition, in the deformation portion, a plate-shaped or cylindrical member deforms between the first connection portion connected to the extending/retracting member and the second connection portion fixed to the container. Accordingly, compared to a spiral leaf spring, it is possible to suppress a decrease in rigidity which is caused by extending and retracting of the extending/retracting member. Therefore, even when a stroke is lengthened, it is possible to suppress misalignment of the extending/retracting member in a radial direction. According to the above-described configuration, it is possible to suppress the vibration, and it is possible to correspond to lengthening of the extending/retracting member.
- In the cryocooler, the deformation portion may be provided to surround the extending/retracting member when viewed in the prescribed direction. In this manner, it is possible to sufficiently support the extending/retracting member. Accordingly, it is possible to further suppress the decreases in the rigidity which is caused by extending and retracting of the extending/retracting member.
- In the cryocooler, the deformation portion may include a plurality of plate-shaped members that are curved or bent. Each of the plate-shaped members may be curved or bent, when viewed in a circumferential direction with reference to a center axis extending in the prescribed direction of the extending/retracting member. In this manner, in response to extending and retracting of the extending/retracting member, the plate-shaped members that are curved or bent can stretch in the prescribed direction. Accordingly, it is possible to support the extending/retracting member.
- The cryocooler may further include a piston fixed to the container. The extending/retracting member may be a cylinder that accommodates the piston. The support member may be disposed in both ends of the cylinder in the prescribed direction. In this manner, the cylinder serving as the extending/retracting member can be sufficiently supported by the support member in both ends of the cylinder.
- The cryocooler may further include a coil that generates a force for enabling the extending/retracting member to extend and retract. The deformation portion may be formed of a conductive material and may supply electric power to the coil. In this manner, the deformation portion can also be used as a member for supplying the electric power to the coil.
- In the cryocooler, the deformation portion may include a plurality of plate-shaped members that are curved or bent. The plate-shaped member may be formed of a material in which rigidity in a first direction in a plane direction is different from rigidity in a second direction perpendicular to the first direction in the plane direction. In this manner, the deformation portion is aligned so that a low rigidity direction corresponds to the prescribed direction and a high rigidity direction corresponds to the perpendicular direction. Accordingly, it is possible to sufficiently restrict the movement of the extending/retracting member in perpendicular direction.
- According to another aspect of the present invention, there is provided a support structure for an extending/retracting member which includes an extending/retracting member capable of extending and retracting in a prescribed direction, and a support member that supports the extending/retracting member to be capable of extending and retracting in the prescribed direction, and that restricts movement in a perpendicular direction perpendicular to the prescribed direction. The support member includes a first connection portion connected to the extending/retracting member, a second connection portion connected to a prescribed member, and a deformation portion extending in the prescribed direction, having one end connected to the first connection portion, having the other end connected to the second connection portion, and deforming in the prescribed direction. The deformation portion includes a member having a bent plate shape or cylindrical shape.
- According to the support structure for the extending/retracting member in the aspect of the present invention, the same operations and advantageous effects as those of the above-described cryocooler can be achieved.
- According to the present invention, it is possible to provide a cryocooler, and a support structure for an extending/retracting member that can suppress vibration and can correspond to lengthening of the extending/retracting member.
-
-
Fig. 1 is a sectional view illustrating a configuration of a cryocooler according to an embodiment of the present invention. -
Fig. 2 is an enlarged view of a gas compressor of the cryocooler illustrated inFig. 1 . -
Fig. 3 is a perspective view of a deformation portion of a support structure. -
Fig. 4 is a sectional view illustrating a gas compressor of a cryocooler according to a modification example. -
Figs. 5A to 5C are sectional views of a support member according to a modification example. -
Figs. 6A to 6C are views illustrating a support structure according to a modification example. - Hereinafter, a cryocooler, and a support structure for an extending/retracting member according to the present invention will be described with reference to the accompanying drawings. The same reference numerals will be given to the same elements or equivalent elements in each drawing, and repeated description will be omitted.
- As illustrated in
Fig. 1 , a cryocooler 1 is a Stirling cryocooler using a so-called Stirling cycle, and is a small cryocooler that generates a cooling temperature of approximately 80 K, for example. The cryocooler 1 includes agas compressor 2, acold head 3, and acapillary tube 4 that connects both of these to each other. The cryocooler 1 is internally filled with refrigerant gas (refrigerant) used for a freezing operation. For example, helium gas can be used as the refrigerant gas. - The
gas compressor 2 adopts asupport structure 50 for an extending/retracting member according to the present embodiment. Thegas compressor 2 according to the present embodiment has a symmetric configuration with reference to a center position in an axial direction (prescribed direction) in which a center axis CL extends. Therefore, unless otherwise described, only one side configuration in the axial direction will be described. In addition, a side closer to the center position in the axial direction will be referred to as "inward in the axial direction", and a side closer to both ends will be referred to as "outward in the axial direction". In addition, a direction closer to or away from the center axis CL, which is a perpendicular direction perpendicular to the center axis CL will be referred to as a "radial direction". In addition, a side away from the center axis CL in the radial direction will be referred to as an "outer peripheral side in the radial direction", and a side closer to the center axis CL will be referred to as an "inner peripheral side in the radial direction". In addition, a direction around the center axis CL will be referred to as a "circumferential direction". As illustrated inFigs. 1 and2 , thegas compressor 2 includes acontainer 10, a cylinder (extending/retracting member) 6, apiston 7, ayoke 8, andsupport members support structure 50 for the extending/retracting member is configured to include thecylinder 6 and thesupport members - The
container 10 has a substantially cylindrical shape extending in the axial direction around the center axis CL, and is internally filled with the above-described refrigerant gas. Apartition member 5 spreading around the center axis is disposed at a center position of thecontainer 10 in the axial direction. - The
cylinder 6 constitutes the extending/retracting member capable of extending and retracting in the axial direction. That is, thecylinder 6 can reciprocate along the axial direction. Thecylinder 6 is accommodated outside in the axial direction from thepartition member 5 inside thecontainer 10, and has a substantially cylindrical shape extending in the axial direction around the center axis CL. Thecylinder 6 according to the present embodiment includes acylindrical portion 31 having a cylindrical shape, apartition portion 32 that spreads across the radial direction at an intermediate position in the axial direction inside thecylindrical portion 31, and acoil support portion 33 that is disposed in the vicinity of an outer end portion of thecylindrical portion 31 in the axial direction, and that supports a coil 36 (to be described later) . A tip end side of thecoil support portion 33 has thecoil 36 that extends in the radial direction from an outer peripheral surface of thecylindrical portion 31, and that extends inward in the axial direction after being bent. - The
piston 7 is fixed to thecontainer 10. Thepiston 7 is a columnar member extending outward in the axial direction around the center axis CL from the center position of thecontainer 10. An outer end surface of thepiston 7 in the axial direction is accommodated inside thecylindrical portion 31 of thecylinder 6, and faces thepartition portion 32 to be away from each other in the axial direction. In this manner, a compression/expansion space N is formed between thepiston 7 and thecylinder 6. A volume of the compression/expansion space N increases or decreases as thecylinder 6 extends or retracts, thereby expanding and compressing the refrigerant gas in response thereto. Thepiston 7 has aflow path 7a penetrating along the center axis CL and a flow path 7b penetrating from theflow path 7a in the radial direction at the center position in the axial direction. The flow path 7b communicates with aflow path 5a formed inside thepartition member 5 and extending in the radial direction. Theflow path 5a communicates with aflow path 4a of thecapillary tube 4. In this manner, the refrigerant gas compressed in the compression/expansion space N is supplied to thecold head 3 via theflow paths - The
yoke 8 is a double cylindrical member disposed on the outer peripheral side in the radial direction from thecylindrical portion 31 of thecylinder 6. Theyoke 8 is fixed to an inner peripheral surface of thecontainer 10, and is provided to surround thecylindrical portion 31 of thecylinder 6. Theyoke 8 has agroove portion 8a extending inward in the axial direction from the outer end portion in the axial direction. Apermanent magnet 34 is formed on an outer peripheral surface on the outer peripheral side of thegroove portion 8a in the radial direction. In this manner, theyoke 8 forms a magnetic circuit together with thepermanent magnet 34. Thecoil 36 supported by thecoil support portion 33 of thecylinder 6 is disposed in the groove portion 3a of theyoke 8 from the outside toward the inside in the axial direction. In this manner, thecoil 36 is disposed inside the groove portion 3a to face the inner peripheral side of thepermanent magnet 34. Thecoil 36 is excited to generate a force for causing thecylinder 6 serving as the extending/retracting member to extend and retract by using an operation of thepermanent magnet 34. - The
support member 9A supports thecylinder 6 serving as the extending/retracting member to be capable of extending and retracting in the axial direction, and restricts movement in the perpendicular direction (radial direction and circumferential direction) perpendicular to the axial direction. Thesupport member 9A includes afirst connection portion 41A connected to thecylinder 6, asecond connection portion 42A connected to thecontainer 10, and adeformation portion 40A extending in the axial direction, having one end connected to thefirst connection portion 41A, having the other end connected to the second connection portion, and deforming in the axial direction. Thefirst connection portion 41A is connected to the outer end portion of thecylinder 6 in the axial direction. In addition, thesecond connection portion 42A is disposed to face thefirst connection portion 41A while being separated outward in the axial direction. Thefirst connection portion 41A and thesecond connection portion 42A are configured to include a plate-shaped member having an annular shape formed around the center axis CL, or a plate-shaped member having a disc shape. - The
deformation portion 40A is configured to include a bent plate-shaped member. Thedeformation portion 40A is configured to include a plurality of plate-shaped members that are curved. In addition, each of the plate-shaped members is curved when viewed in the circumferential direction with reference to the center axis CL. Specifically, as illustrated inFig. 3 , thedeformation portion 40A is configured so that the plate-shaped member extending in a strip shape is curved into a C-shape in cross section. The plate-shaped member is formed in an elongated rectangular shape. The plate-shaped member is folded so that front and rear planar portions are curved. The plate-shaped member is formed of a material having elastic anisotropy. The plate-shaped member is formed of a material in which rigidity in a longitudinal direction (first direction) in a plane direction and rigidity in a short direction (second direction) in the plane direction are different from each other. Here, the rigidity in the longitudinal direction is low, and the rigidity in the short direction is high. As this material, single crystal metal is used. Examples of applicable single crystal metal include Fe-Mn-Si alloy, Cu-Al-Mn alloy, and Cu-Al-Ni alloy. Here, Cu-Al-Ni alloy is adopted which is excellent in both elastic anisotropy and super-elasticity. In addition, thedeformation portion 40A may be formed of a conductive material. According to this configuration, thedeformation portion 40A is likely to deform in the longitudinal direction (axial direction in an assembly character). On the other hand, thedeformation portion 40A maintains its shape without deforming in the short direction (perpendicular direction perpendicular to the axial direction). - The outer end portion of the
deformation portion 40A in the axial direction is connected to thesecond connection portion 42A, and the inner end portion is connected to thefirst connection portion 41A. Thedeformation portion 40A is connected to an outer peripheral edge portion of thefirst connection portion 41A and thesecond connection portion 42A. Each plate-shaped member of thedeformation portion 40A is curved when viewed in the circumferential direction with reference to the axial direction. Thedeformation portion 40A is curved to protrude toward the inner peripheral side in the radial direction. A plurality of thedeformation parts 40A are provided to surround thecylinder 6 when viewed in the axial direction. The plurality ofdeformation parts 40A may be disposed at an equal angle around the center axis CL. The number of thedeformation parts 40A is not particularly limited. According to the above-described configuration, thedeformation portion 40A deforms in the axial direction. On the other hand, thedeformation portion 40A maintains its shape without deforming in the perpendicular direction perpendicular to the axial direction. That is, thesupport member 9A can support thecylinder 6 be capable of extending and retracting in the axial direction, and can restrict movement in the perpendicular direction perpendicular to the axial direction. Thesupport member 9A can function as an energizing member for supplying electricity to thecoil 36. - The
support member 9B includes afirst connection portion 41B connected to thecylinder 6, asecond connection portion 42B connected to thecontainer 10, and adeformation portion 40B extending in the axial direction, having one end connected to thefirst connection portion 41B, having the other end connected to thesecond connection portion 42B, and deforming in the axial direction. Thefirst connection portion 41B is connected to the inner end portion of thecylinder 6 in the axial direction. In addition, thesecond connection portion 42B is disposed to face thefirst connection portion 41B while being separated inward in the axial direction. With regard to other configurations, thefirst connection portion 41B, thesecond connection portion 42B, and thedeformation portion 40B have the same configurations as thefirst connection portion 41A, thesecond connection portion 42A, and thedeformation portion 40A. - As illustrated in
Fig. 1 , thecold head 3 includes acasing 21, acylinder 22, adisplacer 23, asupport rod 27, and acoil spring 25. Thecasing 21 having a substantially columnar shape internally communicates with theflow path 4a inside thecapillary tube 4, and the refrigerant gas is fed into thecasing 21 through thecapillary tube 4. - The
cylinder 22 is a substantially cylindrical member disposed to protrude from thecasing 21. A tip (end that protrudes from the casing 21) of thecylinder 22 is closed. Thecylinder 22 internally has a space that communicates with the inside of thecasing 21. In addition, thedisplacer 23 extending along thecylinder 22 is inserted into thecylinder 22. - An expansion space M is formed on a tip end side of the
cylinder 22 by an inner wall of thecylinder 22 and thedisplacer 23. The refrigerant gas inside thecasing 21 flows into the expansion space M through agas flow path 24 formed inside thedisplacer 23. Thegas flow path 24 inside thedisplacer 23 is filled with aregenerator material 26. - The
displacer 23 is supported by thesupport rod 27 that extends in a protruding direction of thecylinder 22 inside thecasing 21. Thesupport rod 27 is supported by abearing support portion 28 and abearing 29 which are disposed inside thecasing 21, and thebearing 29 supports thedisplacer 23 to be movable in the protruding direction of thecylinder 22 via thesupport rod 27. Thecoil spring 25 is disposed in thecasing 21 to be wound around thesupport rod 27. One end of thecoil spring 25 is attached to thesupport rod 27, and the other end is attached to thebearing support portion 28. Thecoil spring 25 applies an elastic force in a direction in which thedisplacer 23 returns to an initial position, in a case where thedisplacer 23 is moved due to a flow of the refrigerant gas. - In the cryocooler 1, the pair of the
cylinders 6 reciprocates along the axial direction by energizing thecoil 36. That is, the pair of thecylinders 6 moves closer to each other in the axial direction, thereby reducing the compression/expansion space N and compressing the refrigerant gas inside the space. In addition, the pair of thecylinders 6 moves away from each other in the axial direction, thereby enlarging the compression/expansion space N and expanding the refrigerant gas inside the space. When the refrigerant gas is compressed or expanded inside the compression/expansion space N by reciprocating movement of eachcylinder 6, a pressure fluctuation is transmitted to thecold head 3 through the flow path inside thecapillary tube 4, and the refrigerant gas inside thecold head 3 is compressed or decompressed. - When the refrigerant gas in the compression/expansion space N is compressed by the
gas compressor 2, the pressure is transmitted through thecapillary tube 4, and a portion of the refrigerant gas is pushed into the expansion space M while being cooled by theregenerator material 26 inside thecold head 3. Thereafter, when the compression/expansion space N is enlarged by thegas compressor 2, the pressure of the refrigerant gas inside thecold head 3 decreases through thecapillary tube 4, and the refrigerant gas inside the compression/expansion space N is subjected to adiabatic expansion to generate coldness. These processes are repeatedly performed, thereby enabling thecylinder 22 of thecold head 3 to perform a freezing operation of approximately 80K or lower, for example. - Next, operations and advantageous effects of the cryocooler 1 and the
support structure 50 for the extending/retracting member according to the present embodiment will be described. - The cryocooler 1 according to the present embodiment includes the
support members cylinder 6 serving as the extending/retracting member to be capable of extending and retracting in the axial direction, and that restrict the movement in the perpendicular direction perpendicular to the axial direction. Thesupport members first connection portions second connection portions container 10, and thedeformation parts first connection portions second connection portions deformation parts support structure 50, in response to extending and retracting of thecylinder 6, the bent plate-shaped member of thedeformation parts first connection portions deformation parts first connection portions cylinder 6 and thesecond connection portions container 10. Therefore, compared to the spiral leaf spring, it is possible to suppress a decrease in the rigidity which is caused by extending and retracting of thecylinder 6. Therefore, even when a stroke is lengthened, it is possible to suppress misalignment of thecylinder 6 in the radial direction. According to the above-described configuration, it is possible to suppress the vibration, and it is possible to correspond to lengthening of thecylinder 6. - In the cryocooler 1 according to the present embodiment, the
deformation parts cylinder 6 when viewed in the axial direction. In this manner, it is possible to sufficiently support thecylinder 6. Accordingly, it is possible to further suppress the decreases in the rigidity which is caused by extending and retracting of thecylinder 6. - In the cryocooler 1 according to the present embodiment, the
deformation parts cylinder 6. In this manner, in response to extending and retracting of thecylinder 6, the plate-shaped member that is curved or bent stretches in the axial direction. Accordingly, thecylinder 6 can be supported. - The cryocooler 1 according to the present embodiment further includes the
piston 7 fixed to thecontainer 10. Thecylinder 6 accommodates thepiston 7, and thesupport members cylinder 6 in the axial direction. In this manner, thecylinder 6 serving as the extending/retracting member can be sufficiently supported by the support member in both ends of thecylinder 6. - The cryocooler 1 according to the present embodiment further includes the
coil 36 that generates the force for thecylinder 6 to extend and retract. Thedeformation parts coil 36. In this manner, thedeformation parts coil 36. - In the cryocooler according to the present invention, the
deformation parts deformation parts cylinder 6 in perpendicular direction. - According to the present embodiment, there is provided the
support structure 50 for the extending/retracting member. Thesupport structure 50 for the extending/retracting member includes thecylinder 6 serving as the extending/retracting member capable of extending and retracting in the axial direction, and thesupport members cylinder 6 to be capable of extending and retracting in the axial direction, and that restrict the movement in the perpendicular direction perpendicular to the axial direction. Thesupport members first connection portions cylinder 6, thesecond connection portions deformation parts first connection portions second connection portions deformation parts - According to the
support structure 50 for the extending/retracting member in the present embodiment, the same operation and advantageous effect as those of the above-described cryocooler 1 can be achieved. - The present invention is not limited to the above-described embodiment.
- For example, the above-described embodiment adopts the cylinder as the extending/retracting member. However, a piston may be adopted as the extending/retracting member. For example, as illustrated in
Fig. 4 , thegas compressor 2 of acryocooler 100 includes acylinder 106 fixed to thecontainer 10, and apiston 107 capable of extending and retracting. Thecylinder 106 is disposed in the vicinity of a center position of thecontainer 10 in the axial direction. Thecylinder 106 has the compression/expansion space N that communicates with theflow path 5a of thepartition member 5 to accommodate thepiston 107. Thepiston 107 includes apiston member 131 to be accommodated in the compression/expansion space N of thecylinder 106, apiston rod 132 connected to thepiston member 131 and extending in the axial direction, and acoil support portion 133 disposed in the vicinity of an outer end portion of thepiston rod 132 in the axial direction. The outer end portion of thepiston rod 132 in the axial direction is connected to thefirst connection portion 41A of thesupport member 9A. A position of thepiston rod 132 between theyoke 8 and thecylinder 106 is connected to thefirst connection portion 41B of thesupport member 9B. A through-hole is formed in thesecond connection portion 42B, and thepiston rod 132 is inserted into the through-hole. - In addition, in the above-described embodiment, the support structure for the extending/retracting member is applied to the
gas compressor 2. However, the support structure for the extending/retracting member may be applied to thecold head 3. - In addition, the configuration of the deformation portion of the support member is not limited to the above-described embodiment, and can be modified as appropriate within the scope not departing from the gist of the present invention. For example, as in a
support member 150 illustrated inFig. 5A , adeformation portion 153 configured to include a bent plate-shaped member may be adopted. In addition, a curved form or the number of curved times of the plate-shaped member is not particularly limited. As in asupport member 160 illustrated inFig. 5B , adeformation portion 163 configured to include a plate-shaped member curved twice in a substantially S-shape may be adopted. As in asupport member 170 illustrated inFig. 5C , adeformation portion 173 configured to include a bent cylindrical member may be adopted. For example, thedeformation portion 173 may be configured to include a bellows that is a cylindrical member bent in multiple stages. In addition, a curved cylindrical member may be adopted as the deformation part. - In addition, a bent or curved form of the plate-shaped member is not particularly limited. As in a
deformation portion 180 illustrated inFigs. 6A and 6B , a slit may be inserted into one plate-shaped member so as to formbifurcated portions bifurcated portion 181 may be curved or bent to one side in the axial direction, and the otherbifurcated portion 182 may be curved or bent to the other side in the axial direction. In addition, a shape of the plate-shaped member configuring the deformation portion is not particularly limited, and other shapes in addition to the rectangular shape may be adopted. For example, as in adeformation portion 190 illustrated inFig. 6C , an edge portion may be curved so that the vicinity of the center position in the longitudinal direction is recessed. In this way, a spring constant may be adjusted by adjusting the shape of the plate-shaped member itself. In addition, in the support member, a member that generates an elastic force may not be only the deformation part. In a case where the spring constant is insufficient, a coil spring may be additionally used. -
- 1, 100:
- cryocooler
- 6, 106:
- cylinder
- 7, 107:
- piston
- 9A, 9B, 150, 160, 170:
- support member
- 36:
- coil
- 40A, 40B, 153, 163, 173, 180, 190:
- deformation portion
- 41A, 41B:
- first connection portion
- 42A, 42B:
- second connection portion
- 50:
- support structure
Claims (7)
- A cryocooler comprising:a container filled with a refrigerant;an extending/retracting member capable of extending and retracting in a prescribed direction; anda support member that supports the extending/retracting member to be capable of extending and retracting in the prescribed direction, and that restricts movement in a perpendicular direction perpendicular to the prescribed direction,wherein the support member includesa first connection portion connected to the extending/retracting member,a second connection portion connected to the container, anda deformation portion extending in the prescribed direction, having one end connected to the first connection portion, having the other end connected to the second connection portion, and deforming in the prescribed direction, andwherein the deformation portion is formed of a member having a bent plate shape or a cylindrical shape.
- The cryocooler according to claim 1,
wherein the deformation portion is provided to surround the extending/retracting member when viewed in the prescribed direction. - The cryocooler according to claim 2,
wherein the deformation portion includes a plurality of plate-shaped members that are curved or bent, and
wherein each of the plate-shaped members is curved or bent, when viewed in a circumferential direction with reference to a center axis extending in the prescribed direction of the extending/retracting member. - The cryocooler according to any one of claims 1 to 3, further comprising:a piston fixed to the container,wherein the extending/retracting member is a cylinder that accommodates the piston, andwherein the support member is disposed in both ends of the cylinder in the prescribed direction.
- The cryocooler according to any one of claims 1 to 4, further comprising:a coil that generates a force for enabling the extending/retracting member to extend and retract,wherein the deformation portion is formed of a conductive material and supplies electric power to the coil.
- The cryocooler according to any one of claims 1 to 5,
wherein the deformation portion includes a plurality of plate-shaped members that are curved or bent, and
wherein the plate-shaped member is formed of a material in which rigidity in a first direction in a plane direction is different from rigidity in a second direction perpendicular to the first direction in the plane direction. - A support structure for an extending/retracting member, comprising
an extending/retracting member capable of extending and retracting in a prescribed direction; and
a support member that supports the extending/retracting member to be capable of extending and retracting in the prescribed direction, and that restricts movement in a perpendicular direction perpendicular to the prescribed direction.
wherein the support member includesa first connection portion connected to the extending/retracting member;a second connection portion connected to a prescribed member, anda deformation portion extending in the prescribed direction, having one end connected to the first connection portion, having the other end connected to the second connection portion, and deforming in the prescribed direction,wherein the deformation portion is formed of a member having a bent plate shape or a cylindrical shape.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2017097504A JP6814439B2 (en) | 2017-05-16 | 2017-05-16 | Support structure for refrigerators and advancing / retreating members |
PCT/JP2018/016358 WO2018211911A1 (en) | 2017-05-16 | 2018-04-20 | Freezer, and support structure for extending/retracting member |
Publications (2)
Publication Number | Publication Date |
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EP3627069A1 true EP3627069A1 (en) | 2020-03-25 |
EP3627069A4 EP3627069A4 (en) | 2020-11-04 |
Family
ID=64274313
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18802005.1A Pending EP3627069A4 (en) | 2017-05-16 | 2018-04-20 | Freezer, and support structure for extending/retracting member |
Country Status (3)
Country | Link |
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EP (1) | EP3627069A4 (en) |
JP (1) | JP6814439B2 (en) |
WO (1) | WO2018211911A1 (en) |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05288419A (en) | 1992-01-31 | 1993-11-02 | Mitsubishi Electric Corp | Holding structure for suspension spring of freezer device |
JP3120593B2 (en) * | 1992-10-05 | 2000-12-25 | 株式会社日立製作所 | Head slider support device |
JP2716922B2 (en) * | 1993-03-09 | 1998-02-18 | 住友重機械工業株式会社 | Stirling cooler compressor |
JPH09228012A (en) * | 1996-02-21 | 1997-09-02 | Furukawa Electric Co Ltd:The | Shape memory alloy leaf spring and its production |
JPH112468A (en) * | 1997-06-13 | 1999-01-06 | Daikin Ind Ltd | Stirling refrigerating machine |
JP2006090652A (en) * | 2004-09-24 | 2006-04-06 | Aisin Seiki Co Ltd | Refrigerant expanding device |
JP2007141684A (en) * | 2005-11-18 | 2007-06-07 | Kojima Press Co Ltd | Contact device |
JP2008215440A (en) * | 2007-03-01 | 2008-09-18 | Sumitomo Heavy Ind Ltd | Plate spring and refrigerator |
JP2013185750A (en) | 2012-03-07 | 2013-09-19 | Sumitomo Heavy Ind Ltd | Refrigerator |
JP6559462B2 (en) * | 2015-05-12 | 2019-08-14 | 株式会社東芝 | Cryogenic container and superconducting magnet device |
JP6580450B2 (en) * | 2015-10-23 | 2019-09-25 | 住友重機械工業株式会社 | Valve structure, non-lubricated linear compressor, and cryogenic refrigerator |
-
2017
- 2017-05-16 JP JP2017097504A patent/JP6814439B2/en active Active
-
2018
- 2018-04-20 EP EP18802005.1A patent/EP3627069A4/en active Pending
- 2018-04-20 WO PCT/JP2018/016358 patent/WO2018211911A1/en unknown
Also Published As
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JP2018194218A (en) | 2018-12-06 |
WO2018211911A1 (en) | 2018-11-22 |
EP3627069A4 (en) | 2020-11-04 |
JP6814439B2 (en) | 2021-01-20 |
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