摘要:
A refrigerator includes a refrigerator cabinet having a fresh food compartment and a freezer compartment. There is a fresh food compartment door for providing access to the fresh food compartment and an ice compartment mounted at the fresh food compartment door. A cold plate is mounted within the fresh food compartment and adapted for cooling the ice compartment when the fresh food compartment door is in a closed position.
摘要:
A cryogenic container with a built-in refrigerator according to the present invention comprises the refrigerator having a first heat absorbing part and a first heat dissipating part, a vacuum vessel for containing and thermally insulating an object to be cooled while holding the object at a cryogenic temperature through the first heat absorbing part of the refrigerator, and a pre-cooling unit having a second heat absorbing part and a second heat dissipating part for cooling the first heat dissipating part, wherein the first heat dissipating part and the second heat absorbing part are arranged inside the vacuum vessel, and a part of a heat dissipating unit including the second heat dissipating part is exposed outside the vacuum vessel.According to the present invention, in the cryogenic container with the built-in refrigerator capable of cooling the object to be cooled to the cryogenic temperature, the refrigerator efficiency can be improved by cooling a heat dissipating surface of the first heat dissipating part of the refrigerator to a level lower than the room temperature.
摘要:
Measuring module for the measurement of an object (6), having a measuring chamber (4), with a contact element (5a, 5b), wherein the object to be measured (6) is thermally connected to a first contact surface (9a) of the contact element (5a, 5b), and having a cold head (1b, 2b, 2c) that can be thermally connected to a second contact surface (9b) of the contact element (5a, 5b), wherein the contact element (5a, 5b) consists of material with high thermal conductivity, characterized in that the cryo-refrigerator (1a, 2a) together with the cold head is housed in a refrigerating chamber (3) that is physically separated from the measuring chamber (4) and can be evacuated separately from the latter, and the contact element (5a, 5b) is thermally insulated from the outside wall of the measuring module, is part of a separating wall between the measuring chamber (4) and the refrigerating chamber (3), and makes a local thermal connection between the measuring chamber (4) and the refrigerating chamber (3), and with a contacting mechanism to vary heat flow in the hermetically sealed condition of the measuring module. With such a measuring module, cooling times and heating times of the object to be measured can be greatly reduced.
摘要:
A cryostat configuration comprising an outer shell and a cryocontainer (2) for cryogenic fluid installed therein, wherein the cryocontainer (2) is connected to the outer shell via at least two suspension tubes (16), and with a neck tube (1) whose upper warm end is connected to the outer shell and whose lower cold end is connected to the cryocontainer (2) and into which a cold head (3) of a multi-stage cryocooler is installed, wherein the outer shell, the cryocontainer (2), the suspension tubes (16) and the neck tube (1) delimit an evacuated space, and wherein the cryocontainer (2) is moreover surrounded by at least one radiation shield which is connected to the suspension tubes (16) and optionally to the neck tube (1) of the cryocontainer (2) in a thermally conducting fashion, is characterized by a seal which can be manually and/or automatically actuated to separate the cold end of the neck tube (1) from the cryocontainer (2) in such a manner that fluid flow between the cryocontainer (2) and the neck tube (1) is minimized or completely interrupted. A cryostat configuration of this type ensures safe installation and removal of a cold head (3) into and from a neck tube (1) of a helium container (2).
摘要:
A stationary point is set on a cold end of a cryocooler. An article is mounted on the stationary point to be cooled via the stationary point. In this case, the article can be cooled up to an extremely low temperature with isolation of vibration to the article.
摘要:
Various embodiments for a freezing receptacle and apparatus are described. The freezing receptacle includes a freezing box with a thermal agent that serves to freeze or cool an object or maintain the temperature of the object. The freezing receptacle includes at least one side wall having a sloped inner face that slopes inwards to ensure that the thermal agent remains in thermal contact with the object continuously as the thermal agent changes size and at least one side wall with a vertical face or an outer face that slopes outwards.
摘要:
Systems and methods are provided for a variable cooling capacity cryocooler for a superconducting magnetic resonance imaging device having a liquid cryogen pressure vessel to provide cryogenic temperatures to a magnet assembly, a vacuum vessel surrounding the pressure vessel and a radiation shield spaced from the cryogen pressure vessel, and a pressure sensor positioned inside the cryogen pressure vessel pressure boundary for sensing pressure variations. A controller for varying the heat removal rate of the cryocooler based on the pressure variations in the cryogen pressure vessel and where the cooling capacity of the cryocooler is adjusted by modifying the speed of the electric power drive (DC or AC motors) or by changing the mechanical transmission ratio between the constant speed electric power drive and the cryocooler displacer/piston to adjust the cooler oscillating frequency of the gas flow. The invention can be adapted to magnets or non magnets systems using Stirling, Gifford-McMahon (“GM”) and Pulse Tube (“PT”) cooler systems. The system will extend component end of life and provide a controllable constant pressure improving image quality for superconducting MRI magnets.
摘要:
A cryostat cooled by a pulse tube refrigerator and containing electrically powered equipment, wherein an electrical conductor is provided to the electrically powered equipment, said electrical conductor being in thermal and mechanical contact with one or more of the tubes of the pulse tube refrigerator.
摘要:
The present invention relates to pulse tube refrigerators for recondensing cryogenic liquids. In particular, the present invention relates to the same for magnetic resonance imaging systems. In many cryogenic applications components, e.g. superconducting coils for magnetic resonance imaging (MRI), superconducting transformers, generators, electronics, are cooled by keeping them in contact with a volume of liquified gases (e.g. Helium, Neon, Nitrogen, Argon, Methane . . . ). Any dissipation in the components or heat getting into the system causes the volume to part boil off. To account for the losses, replenishment is required. This service operation is considered to be problematic by many users and great efforts have been made over the years to introduce refrigerators that recondense any lost liquid right back into the bath. The present invention addresses the problems arising from convection which occurs within a pulse tube refrigerator. The invention provides. in a first aspect, a PTR recondenser wherein, the individual tubes of PTR are insulated by a split sleeve around the whole assembly. Preferably, the sleeve is split into two parts. This configuration has been shown to reduce convection and problems associated therewith.
摘要:
The invention relates to an insulated container (11) which can be evacuated and has an application (12) to be cooled, in which insulated container (11) a vacuum can be built up by means of a vacuum pump (22). In order to allow the vacuum pump (22) to be switched off during normal operation, a getter material (26) is arranged in the insulated container and binds gas components which penetrate into the insulated container as a result of unavoidable leakages. The invention provides for the getter material to be accommodated in maintenance areas (20), which can be disconnected by means of valves (21) from the working area (18) which contains the application (12). This allows the getter materials (26) in each maintenance area to be replaced or regenerated, while the operation of the application (12) to be cooled can be maintained owing to the partitioning of the working area (18) from the maintenance area (20).