Signal transmission device for air conditioner

A communication device for pipes of an air conditioner, the device comprising:

• a refrigerant pipe connecting an outdoor unit and an indoor unit to each other, the refrigerant pipe having an outer circumferential surface;
• a core assembly having a pipe insertion recess formed therein to accommodate the refrigerant pipe, the core assembly comprising a core and a core holder, the core made of a magnetic material and having an inner circumferential surface and an outer circumferential surface such that the inner circumferential surface of the core is facing an outer circumferential surface of the refrigerant pipe, and the core holder made of an insulating material and surrounding the outer circumferential surface of the core;
• and
• a signal line that is configured to transfer electric signals transmitted and received through the refrigerant pipe to an outdoor unit controller controlling the outdoor unit and an indoor unit controller controlling the indoor unit, respectively,
• wherein the core and the core holder are each formed with the pipe insertion recess,
• wherein the signal line is located between the outer circumferential surface of the refrigerant pipe and an inner circumferential surface of the core assembly along a lengthwise direction of the core assembly and is electrically connected to the outdoor unit controller and the indoor unit controller,
• wherein the core assembly has an annular sectional shape with a first side open end and a second side open end,
• wherein the signal line extends through the core assembly from the first side open end to the second side open end along the lengthwise direction of the core assembly, and
• wherein the signal line wraps at least once on the inner circumferential surface of the core assembly and an outer circumferential surface of the core assembly along the lengthwise direction of the core assembly,
• wherein the inner circumferential surface of the core assembly comprises the inner circumferential surface of the core and the core holder.