 |
|
Sumitomo Heavy Industries, Ltd.(SHI) has been developing 4K pulse tube cryocoolers for cooling MRI Magnet Systems, Small Superconducting Magnets, SQUIDs, X-ray detectors, etc. Recently, SHI released two new products called SRP-062B and SRP-062BS. For both SRP-062B and SRP-062BS, the valve unit is separated from the cold head by a self-sealed coupling. With this configuration, the maintenance for the valve unit becomes much easier and faster than that with an integrated one. With a separated valve unit, it is not necessary to warm up the cold head and cool down again. And also, the vibration displacement has been reduced by optimizing the wall thickness of regenerators and pulse tubes. Furthermore, the vibration displacement has been reduced by separating the regenerators and pulse tubes with a thin tube so that the vibration displacement from regenerators and pulse tubes do not interfere with each other. For SRP-062BS, the vi-bration acceleration is further reduced by separating the valve unit from the coldhead with 1 m flexline. For both SRP-062B and SRP-062BS, the typical vibration displacement is less than ±3 µm. The performance of SRP-062BS is about 10% less than that of SRP-062B because of the increased dead volume and pressure drop through the 1 m flexline.
|
|
