Heat pipe type cooling device and railcar control equipment using the same

摘要

An economical heat pipe type cooling device with high performance and stable start at low environmental temperatures below 0° C., and a railcar control equipment using the invented heat pipe type cooling device are provided. The midsection between two bents formed on a heat pipe is used as an evaporator; lengths of two distal sections to be used as the condenser sections are intentionally differentiated each from the other; and the condenser section of greater length is provided with heat radiating fins more than those on the condenser section of shorter length. This configuration permits each of two condenser sections to be provided with mutually different condensing capacity and accordingly the condenser section of shorter length works to cool heat-generating elements even though the condenser section of greater length would suffer from freezing problem at low temperatures. A sufficient cooling effect is rendered at ordinary temperature.

主权项

1. A heat pipe type cooling device comprising:
a heat absorption block, in which part of a heat pipe is embedded as an evaporator section of said heat pipe and on which a heat-generating element is mounted as an object to be cooled, and a plurality of heat radiating fins that are installed on another part of said heat pipe as a condenser section of said heat pipe, wherein said heat pipe, which is a J-shaped heat pipe having two bents thereon, is comprised of: a heat-in section, which is located at the midsection of said heat pipe, working as said evaporator section of said heat pipe; a first heat-out section, which is located on a portion of said heat pipe other than said evaporator section, working as a condenser section of said heat pipe having a plurality of heat radiating fins thereon; and a second heat-out section, which is located on a portion of said heat pipe other than said evaporator section and said first heat-out section, working as another condenser section of said heat pipe having a larger number of heat radiating fins thereon than that of said first heat-out section, wherein the length of said second heat-out section is greater than that of said first heat-out section so that said second heat-out section has a condensing capacity larger than that of said first heat-out section, wherein said heat-in section is comprised of a straight-shaped pipe portion, and wherein said straight-shaped pipe portion is comprised of a pressed or crimped portion, a first straight-shaped pipe portion extending between said pressed or crimped portion and said first heat-out section, and a second straight-shaped pipe portion extending between said pressed or crimped portion and said second heat-out section, said second straight-shaped pipe portion having a length greater than that of said first straight-shaped pipe portion.