Hitachi Cable, Inc.

Kenichi Inui

Ken Horiguchi

Katsumi Nomura

Yusuke Takenaga

Tomo Kawano

Mamoru Hofuku

Mamoru Houfuku

Yoshio Suzuki

Tadao Otani

Masakazu Tobe

A heat transfer pipewith grooved inner surface is provided with a pipe bodyhaving a pipe axis line &#x25ef; as a center axis line, a plurality of first finseach having a fin height Hf, formed by providing a plurality of spiral groovesat an inner surface of the pipe bodyalong the pipe axis line &#x25ef; and at least a second finhaving a fin height hf, provided at a groove bottom of at least one of the spiral groove. The fin height hf and a torsion angle &#x3b1; of the second finare determined respectively to satisfy the following conditions:/15&#x2266;/3 and &#x3b1;=&#x3b2;,

Heat transfer pipe with grooved inner surface

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.

Level wound coil, method of manufacturing same, and package for same

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.

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.

Level wound coil mounted on pallet, and package for same

In an inner surface-grooved heat transfer tube, a plurality of fins is formed on the inner surface thereof along a line forming a first predetermined angle with respect to the longitudinal axis of the tube, a plurality of notches is defined on the fins along a line forming a second predetermined angle with respect to the longitudinal axis, and the depth Hf' of the notches is specified to be 20% or more and below 40% (0.2.ltoreq.Hf'/Hf&lt;0.4) with respect to the height Hf of the fins, to provide an inner surface-grooved heat transfer tube which can suppress pressure loss of a refrigerant, and by which improvements in performance of condensation and evaporation are intended. In addition no increase of power consumption is required for the pump.

Growing community of inventors

Tsuchiura, Japan

Kenichi Inui