| 摘要 |
Temperature control device (20) for an NMR sample tube (22), wherein multiple interleaved, concentric flow channels (28, 31; 40, 41, 42; 50, 51) for temperature control fluid extending coaxially with respect to a cylindrical interior space (21) for holding the NMR sample tube are constituted around said interior space (21), wherein said temperature control device is constituted such that it is closed toward the interior space in an axial end region (26) and, an axial end region (23) at the opposite end thereto, open to the interior space for inserting the NMR sample tube into said interior space (21), wherein, in a counter flow region (GB), adjacent flow channels (28, 31; 40, 41, 42; 51) are interconnected through a fluid passage (34, 43, 44) at one axial end in such a way that the direction of a fluid flow in the flow channels of the counter flow region is reversed with respect to the corresponding adjacent flow channel in the counter flow region, wherein the outermost flow channel (28; 51) of the counter flow region has a fluid inlet (32) at one axial end, and wherein the innermost flow channel (31; 42) of the counter flow region has a fluid passage (36) to the interior space at one axial end that faces toward the axial end region that is closed, is characterized in that at least one of the flow channels, in particular, the outermost flow channel (28; 50) of the temperature control device and/or the next outermost flow channel (31; 40; 50) of the temperature control device has a fluid outlet (35) at one axial end, through which at least part (MS) of the temperature-controlling fluid flow that is conveyed along the outermost flow channel (28; 50) of the temperature control device can escape from the temperature control device without passing through all of the flow channels of the counter-low region. With this invention, temperature control of an NMR sample tube can be ensured with low temperature gradients, while achieving a high temperature control performance. |
| 主权项 |
1. A temperature control device for an NMR sample tube, the device comprising:
multiple interleaved, concentric flow channels for temperature control fluid, said flow channels extending coaxially and surrounding a cylindrical interior space for holding the NMR sample tube, wherein said temperature control device is closed toward said interior space in a first axial end region and open to said interior space in a second axial end region opposite to said first axial end region, the NMR sample tube being inserted into said interior space at said second axial end region, wherein, in a counter flow region, adjacent flow channels are interconnected through a counter flow fluid passage at one axial end in such a way that a direction of fluid flow in flow channels of said counter flow region is reversed with respect to a corresponding adjacent flow channel in said counter flow region, an outermost flow channel of said counter flow region having a first fluid inlet at one axial end and an innermost flow channel of said counter flow region having a first fluid outlet to said interior space proximate to said closed, first axial end region, wherein at least one of said flow channels of the temperature control device has a second fluid outlet at one axial end, through which at least part of the temperature-controlling fluid flow of the temperature control device can escape from the temperature control device without passing through all flow channels of said counter flow region, wherein an axial wall that separates an outermost flow channel of said counter flow region from a next outermost flow channel, exhibits a thermal transmittance UAN in a transverse direction, wherein any other remaining axial walls that are located between flow channels of said counter flow region and an axial wall that separates an innermost flow channel from said interior space, each exhibit a thermal transmittance in the transverse direction greater than UAN, greater than 3*UAN, greater than 10*UAN or greater than 50*UAN. |
