Double inlet type pulse tube refrigerator

A double inlet type pulse tube refrigerator, comprising:

• a regenerator having a high temperature end and a low temperature end;
• a pulse tube having a high temperature end and a low temperature end, the low temperature end being connected to the low temperature end of the regenerator;
• a compressor having a high pressure supplying side and low pressure receiving side for a coolant, wherein
• the high pressure supplying side is connected to the high temperature end of the regenerator via a coolant supplying path having a first opening and closing valve, and
• the low pressure supplying side is connected to the high temperature end of the regenerator via a coolant receiving path having a second opening and closing valve;
• a bypass pipe having a double inlet valve, the bypass pipe being configured to connect the high temperature end of the pulse tube and the high temperature end of the regenerator;
• a buffer tank connected to the high temperature end of the pulse tube via a first pipe having a first flow path resistance member;
• and
• a second pipe having a second flow path resistance member including a third opening and closing valve,
• wherein the second pipe is provided between the compressor and the buffer tank or the first pipe;
• and
• the third opening and closing valve is configured to be opened and closed corresponding to an opening state and closing state of the first opening and closing valve.