Abstract: A rotary compressor includes: a closed upright cylindrical compressor housing including an upper portion provided with a discharge section of refrigerant and a body portion provided with an intake section of the refrigerant; a compression section disposed at a lower part in the compressor housing and configured to compress the refrigerant suctioned by the intake section to discharge the refrigerant from the discharge section; and a motor disposed at an upper part in the compressor housing and configured to drive the compression section. The motor has a rotor disposed on an inner side and a stator disposed on an outer side, the refrigerant is HFO1123 refrigerant or a refrigerant mixture containing the HFO1123 refrigerant, and an inner welded portion formed by welding using flux is provided within a projection area of the rotor at the upper portion of the compressor housing.

Abstract: A heat exchanger includes: a heat transfer pipe in which refrigerant flows; and a spiral groove formed at an inner peripheral surface of the heat transfer pipe. A height of an inner wall of the groove in a radial direction of the heat transfer pipe is equal to or greater than 0.1 [mm], and when a wetted edge length of the heat transfer pipe is S, an inclination angle between a pipe axis direction of the heat transfer pipe and a longitudinal direction of the groove in a section of the heat transfer pipe parallel with the pipe axis direction is ?, and a length of the heat transfer pipe is L, the inclination angle ? is an acute angle, and a wetted area S×L/cos ? of the heat transfer pipe satisfies S×L/cos ??0.5 [m2].

Abstract: A rotary compressor includes: a closed upright cylindrical compressor housing including an upper portion provided with a discharge section of refrigerant and a body portion provided with an intake section of the refrigerant; a compression section disposed at a lower part in the compressor housing and configured to compress the refrigerant suctioned by the intake section to discharge the refrigerant from the discharge section; and a motor disposed at an upper part in the compressor housing and configured to drive the compression section. The motor has a rotor disposed on an inner side and a stator disposed on an outer side, the refrigerant is HFO1123 refrigerant or a refrigerant mixture containing the HFO1123 refrigerant, and an inner welded portion formed by welding using flux is provided within a projection area of the rotor at the upper portion of the compressor housing.

Abstract: A heat exchanger includes: a heat transfer pipe in which refrigerant flows; and a spiral groove formed at an inner peripheral surface of the heat transfer pipe. A height of an inner wall of the groove in a radial direction of the heat transfer pipe is equal to or greater than 0.1 [mm], and when a wetted edge length of the heat transfer pipe is S, an inclination angle between a pipe axis direction of the heat transfer pipe and a longitudinal direction of the groove in a section of the heat transfer pipe parallel with the pipe axis direction is —0, and a length of the heat transfer pipe is L, the inclination angle ? is an acute angle, and a wetted area S×L/cos ? of the heat transfer pipe satisfies S×L/cos ??0.5 [m2].

Abstract: A heat transfer pipe 21 with grooved inner surface is provided with a pipe body 22 having a pipe axis line ? as a center axis line, a plurality of first fins 23 each having a fin height Hf, formed by providing a plurality of spiral grooves 200 at an inner surface of the pipe body 22 along the pipe axis line ? and at least a second fin 24 having a fin height hf, provided at a groove bottom of at least one of the spiral groove 200. The fin height hf and a torsion angle ? of the second fin 24 are determined respectively to satisfy the following conditions: Hf/15?hf?Hf/3 and ?=?, when P=W×di×sin ? and P?0.86 wherein a bottom width of the spiral groove 200 is W, a torsion angle of the spiral groove 200 is ?, and an inner diameter of the pipe body 22 is di.

Abstract: A level wound coil (LWC) having a plurality of coil layers each of which has a pipe wound in alignment winding and in traverse winding. The LWC has a shift section where the pipe is shifted from the m-th coil layer to the (m+1)-th coil layer on a bottom surface thereof when the LWC is disposed on a mount surface. The shift section has the k-th shift section on inner layer side and the (k+1)-th shift section on outer layer side, where a start point of the (k+1)-th shift section does not transit, relative to a start point of the k-th shift section, to a winding direction of the pipe.

Abstract: A level wound coil (LWC) having a plurality of coil layers each of which has a pipe wound in alignment winding and in traverse winding. The LWC has a shift section where the pipe is shifted from the m-th coil layer to the (m+1)-th coil layer on a bottom surface thereof when the LWC is disposed on a mount surface. The shift section has the k-th shift section on inner layer side and the (k+1)-th shift section on outer layer side, where a start point of the (k+1)-th shift section does not transit, relative to a start point of the k-th shift section, to a direction reverse to a winding direction of the pipe. A length of the shift section that does not transit to the reverse direction is controlled.

Abstract: A level wound coil (LWC) having a plurality of coil layers each of which has a pipe wound in alignment winding and in traverse winding. The LWC has a shift section where the pipe is shifted from the m-th coil layer to the (m+1)-th coil layer on a bottom surface thereof when the LWC is disposed on a mount surface. The shift section has the k-th shift section on inner layer side and the (k+1)-th shift section on outer layer side, where a start point of the (k+1)-th shift section does not transit, relative to a start point of the k-th shift section, to a winding direction of the pipe.

Abstract: A level wound coil (LWC) mounted on pallet having; an LWC having a plurality of coil layers each of which has a pipe wound in alignment winding and in traverse winding; and a pallet on which the one or more LWC is mounted or on which the one or more LWC is mounted through a cushioning material. The LWC has a shift section where the pipe is shifted from the m-th coil layer to the (m+1)-th coil layer on a bottom surface thereof when the LWC is disposed on the mount surface. A start point of a (k+1)-th shift section does not transit, relative to a start point of a k-th shift section, in a reverse direction to a winding direction of the pipe. The pallet or the cushioning material has a recessed area that is formed at all or a part of a portion of the pallet or the cushioning material to face the (k+1)-th shift section not transiting in the reverse direction.

Abstract: A level wound coil (LWC) having a plurality of coil layers each of which has a pipe wound in alignment winding and in traverse winding. The LWC has a shift section where the pipe is shifted from the m-th coil layer to the (m+1)-th coil layer on a bottom surface thereof when the LWC is disposed on a mount surface. The shift section has the k-th shift section on inner layer side and the (k+1)-th shift section on outer layer side, where a start point of the (k+1)-th shift section does not transit, relative to a start point of the k-th shift section, to a winding direction of the pipe.

Abstract: A heat transfer tube is formed with a corrugated water tube to be used in a heat exchanger, and satisfying 0.04?Hc/OD, where Hc is the corrugated groove depth of the corrugated tube and OD is the corrugation outside diameter thereof.

Abstract: A level wound coil (LWC) having a plurality of coil layers each of which has a pipe wound in alignment winding and in traverse winding. The LWC has a shift section where the pipe is shifted from the m-th coil layer to the (m+1)-th coil layer on a bottom surface thereof when the LWC is disposed on a mount surface. The shift section has the k-th shift section on inner layer side and the (k+1)-th shift section on outer layer side, where a start point of the (k+1)-th shift section does not transit, relative to a start point of the k-th shift section, to a direction reverse to a winding direction of the pipe. A length of the shift section that does not transit to the reverse direction is controlled.

Abstract: A heat transfer pipe 21 with grooved inner surface is provided with a pipe body 22 having a pipe axis line ? as a center axis line, a plurality of first fins 23 each having a fin height Hf, formed by providing a plurality of spiral grooves 200 at an inner surface of the pipe body 22 along the pipe axis line ? and at least a second fin 24 having a fin height hf, provided at a groove bottom of at least one of the spiral groove 200. The fin height hf and a torsion angle ? of the second fin 24 are determined respectively to satisfy the following conditions: Hf/15?hf?Hf/3 and ?=?, when P=W×di×sin ? and P?0.86 wherein a bottom width of the spiral groove 200 is W, a torsion angle of the spiral groove 200 is ?, and an inner diameter of the pipe body 22 is di.

Abstract: A level wound coil (LWC) having a plurality of coil layers each of which has a pipe wound in alignment winding and in traverse winding. The LWC has a shift section where the pipe is shifted from the m-th coil layer to the (m+1)-th coil layer on a bottom surface thereof when the LWC is disposed on a mount surface. The shift section has the k-th shift section on inner layer side and the (k+1)-th shift section on outer layer side, where a start point of the (k+1)-th shift section does not transit, relative to a start point of the k-th shift section, to a winding direction of the pipe.

Abstract: A method of feeding a metal pipe from an LWC has steps of: mounting the one or more LWC on a mount surface of a pallet such that a coil center axis of the LWC is parallel to the mount surface of the pallet, the metal pipe being wound in alignment winding; and feeding the metal pipe from an inside of an end face of the one or more LWC.

Abstract: A level wound coil (LWC) mounted on pallet having; an LWC having a plurality of coil layers each of which has a pipe wound in alignment winding and in traverse winding; and a pallet on which the one or more LWC is mounted or on which the one or more LWC is mounted through a cushioning material. The LWC has a shift section where the pipe is shifted from the m-th coil layer to the (m+1)-th coil layer on a bottom surface thereof when the LWC is disposed on the mount surface. A start point of a (k+1)-th shift section does not transit, relative to a start point of a k-th shift section, in a reverse direction to a winding direction of the pipe. The pallet or the cushioning material has a recessed area that is formed at all or a part of a portion of the pallet or the cushioning material to face the (k+1)-th shift section not transiting in the reverse direction.