1. A dynamic vibration absorber for a washing machine, the dynamic vibration absorber comprising:
a mass;
at least one elastic body which supports the mass such that the mass is configured to vibrate; and
a guide configured to limit a motion of the mass,
wherein the dynamic vibration absorber is configured to be connected to the washing machine such that vibration of the washing machine is reduced during operation.
2. The dynamic vibration absorber according to claim 1, wherein the guide limits the motion of the mass such that the mass vibrates in a translational direction.
3. The dynamic vibration absorber according to claim 2, wherein the translational direction is parallel to a major direction of gravitational pull.
4. The dynamic vibration absorber according to claim 2, wherein the at least one elastic body comprises first and second elastic bodies, wherein an inertial force of the mass is generated when the mass vibrates, and wherein the mass applies a compressive force to one of the first and second elastic bodies and applies a tensile force to the other of the first and second elastic bodies.
5. The dynamic vibration absorber according to claim 4, wherein one of the first and second elastic bodies supports a first end of the mass in the translational direction, and
the other of the first and second elastic bodies supports a second end of the mass in the translational direction.
6. The dynamic vibration absorber according to claim 2, wherein the elastic body supports one end of the mass in the translational direction such that an inertial force of the mass, generated when the mass vibrates, applies either one of a compressive force and a tensile force to the elastic body in response to a vibration direction of the mass.
7. The dynamic vibration absorber according to claim 1, wherein the guide comprises a housing which limits the motion of the mass such that the mass is configured to vibrate in a translation direction, and wherein the mass is positioned within the housing.
8. The dynamic vibration absorber according to claim 7, wherein the housing comprises a rail configured to guide the mass.
9. The dynamic vibration absorber according to claim 1, further comprising an amplitude limitation unit which limits an amplitude of the mass to a predetermined range.
10. The dynamic vibration absorber according to claim 9, wherein the guide comprises a housing which limits the motion of the mass such that the mass is configured to vibrate in the translational direction, and wherein both the mass and the amplitude limitation unit is provided within the housing.
11. The dynamic vibration absorber according to claim 10, wherein the amplitude limitation unit is provided on an end part of the housing and is configured to partition a closed space defined within the housing.
12. The dynamic vibration absorber according to claim 10, wherein the amplitude limitation unit is provided within the housing.
13. The dynamic vibration absorber according to claim 9, wherein the amplitude limitation unit is provided on the mass body.
14. The dynamic vibration absorber according to claim 1, wherein the guide comprises a shaft extending through the mass, and wherein the shaft is configured to limit a motion of the mass such that the mass vibrates in a translational direction along the shaft.
15. The dynamic vibration absorber according to claim 14, wherein the shaft comprises an amplitude limitation unit configured to limit an amplitude of the mass to a predetermined range.
16. The dynamic vibration absorber according to claim 1, wherein the washing machine comprises at least one leg configured to support the washing machine on a floor surface, and wherein the dynamic vibration absorber is coupled to the at least one leg.
17. The dynamic vibration absorber according to claim 1, wherein the washing machine further comprises a pedestal, and wherein the dynamic vibration absorber is coupled to the pedestal.
18. A washing machine to which the dynamic vibration absorber according to claim 1 is coupled.
19. A dynamic vibration absorber for a washing machine, the dynamic vibration absorber comprising:
a housing;
a mass provided within the housing; and
at least one elastic body which supports the mass such that the mass is configured to vibrate within the housing,
wherein the dynamic vibration absorber is configured to be connected to the washing machine such that the vibration of the washing machine is reduced during operation.
20. The dynamic vibration absorber for the washing machine of claim 19, further comprising an amplitude limitation unit configured to limit an amplitude of the mass to a predetermined range.
21. A washing machine to which the dynamic vibration absorber according to claim 19 is coupled.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A refrigeration system comprising a refrigeration cycle having: a circulation path in which a refrigerant flows; and at least one compressor for compressing the refrigerant, a heat exchanger for cooling the refrigerant compressed by the compressor, at least one expansion turbine for expanding the refrigerant cooled by the heat exchanger to generate cold heat, and a cooling part for cooling an object to be cooled by the cold heat, which are provided on the circulation path in order,
wherein at least either the at least one compressor or the at least one expansion turbine comprises a plurality of compressors or expansion turbines which are arranged in parallel with one another with respect to the circulation path.
2. The refrigeration system according to claim 1, wherein each of the plurality of compressors or each of the plurality of expansion turbines arranged in parallel with one another in the circulation path is configured to be disconnectable from the circulation path via a switching valve.
3. The refrigeration system according to claim 1,
wherein the at least one expansion turbine is housed together with the cooling part in at least one cold box insulated from the outside,
wherein the at least one compressor is housed in at least one compressor unit other than the at least one cold box, and
wherein the at least one compressor unit is placed at a position farther from the object to be cooled than the at least one cold box.
4. The refrigeration system according to claim 3, wherein the at least one compressor unit comprises a plurality of compressor units arranged in parallel with one another with respect to the at least one cold box via a switching valve.
5. The refrigeration system according to claim 3, wherein the at least one cold box comprises a plurality of cold boxes, and the at least one compressor unit comprises a plurality of compressor units, both of the plurality of cold boxes and the plurality of the compressor units being arranged in parallel with one another with respect to the object to be cooled.
6. The refrigeration system according to claim 1,
wherein the at least one compressor comprises a first compressor, a second compressor and a third compressor arranged in series on the circulation path,
wherein the first compressor is connected to an output shaft of a first electric motor together with the second compressor, and
wherein the third compressor is connected to an output shaft of a second electric motor together with one of the at least one expansion turbine.