further in the supporting member 40 b of the second embodiment the heat insulator 20 b directly contacts the frame 48 b however it is unnecessary to use the pipe cramp 44 a which is a component of the supporting member 40 a of the first embodiment therefore the heat insulator 20 b can be made thicker than the heat insulator 20 a of the first embodiment with this the outer surface temperature of the frame 48 b can be made a temperature enabling a person safely touch the outer surface of the frame 48 a however by using the supporting member 40 b of the second embodiment the chiller hoses 8 and 9 are arranged inside the frame 48 b therefore the space can be saved the smaller footprint can be achieved effects of the supporting member 40 b of the second embodiment are described the heat insulator 20 b made of silicon sponge having a coefficient of thermal conductivity u03bb 0 08 w m u00b7 k or aeroflex having a coefficient of thermal conductivity u03bb 0 034 w m u00b7 k was wound to have a thickness of 7 mm around the outer surfaces of the chiller hoses 8 and 9 which were set to be 150 u00b0 c then the chiller hoses 8 and 9 wound by the heat insulator 20 b were fixed to the frame 48 b by directly making the heat insulator 20 b contact the frame 48 b in this state the temperature of the outer surface of the frame 48 b of the supporting member 40 b was monitored as a result the temperature of the outer surface of the frame 48 b constantly became 59 0 u00b0 c for the silicon.