HERMETIC REFRIGERANT COMPRESSOR AND REFRIGERATION APPARATUS
A sealed refrigerant compressor comprises an electric component and a compression component accommodated in a sealed container, and the compression component includes a cylinder and a piston which is reciprocatable inside the cylinder. The electric component includes a stator, and a rotor having a lower surface facing an oil surface of lubricating oil. The rotor has a shape in which its diameter is larger than its length in a rotational axis direction thereof. A core of the rotor is provided with at least one balance hole for adjusting a load balance during rotation of the rotor, for example, at least one balance through-hole.
1 . A sealed refrigerant compressor comprising:
a sealed container in which lubricating oil is reserved in a lower portion in an interior of the sealed container;
an electric component accommodated in the sealed container; and
a compression component accommodated in the sealed container and configured to be driven by the electric component,
wherein the compression component includes a cylinder disposed inside the sealed container to extend in a direction crossing a vertical direction, and a piston which is reciprocatable inside the cylinder,
wherein the electric component includes a stator, and a rotor having a lower surface facing an oil surface of the lubricating oil, and the rotor has a shape in which a diameter of the rotor is larger than a length of the rotor in a rotational axis direction thereof,
wherein a core of the rotor is provided with at least one balance hole configured to adjust a load balance during rotation of the rotor,
wherein the rotor includes a permanent magnet and does not include a magnet protective member covering an outer periphery of the permanent magnet provided in the core, and
wherein the at least one balance hole is located not to be line-symmetric or point-symmetric with respect to a rotational axis of the rotor.
2 . (canceled)
3 . The sealed refrigerant compressor according to claim 1 ,
wherein the at least one balance hole is provided in the core in such a manner that at least a part of the balance hole is located outward relative to the permanent magnet when viewed from the rotational axis direction of the rotor.
4 . The sealed refrigerant compressor according to claim 1 ,
wherein the compression component is accommodated in the sealed container in such a manner that the compression component is located above the electric component.
5 . The sealed refrigerant compressor according to claim 1 ,
wherein the at least one balance hole extends in the rotational axis direction of the rotor.
6 . The sealed refrigerant compressor according to claim 5 , wherein the at least one balance hole is a through-hole.
7 . The sealed refrigerant compressor according to claim 1 ,
wherein a balance weight is fastened to an upper surface of the rotor to adjust a load balance, and
wherein the at least one balance hole is provided within a portion of the core of the rotor to which the balance weight is fastened.
8 . The sealed refrigerant compressor according to claim 1 ,
wherein the at least one balance hole is a blind hole having a bottom surface which is set to be higher than an upper surface of the stator.
9 . A refrigeration device comprising the sealed refrigerant compressor according to claim 1 .