SU1500816A1 - Cold circuit - Google Patents

Abstract

The invention relates to a cryogenic technique, mainly to cold lines with screen-vacuum insulation, and can be used to transfer cold along two levels with the adjustment of the cooling object. The purpose of the invention is to enable the simultaneous transfer of cold to a higher temperature level while reducing the loss of cold in the low-temperature element. During the installation of the cooling pipeline, the cavity of the casing 1 is evacuated and the ends of the insulating material are joined to the insulation of the source and the cooling object. Cold from the low temperature cooling source is transferred through the heat-conducting rod 5, plate packs 6 and tip 7, and from a higher temperature coolant source through pipe 3, harnesses 10 and holder 11. The plates pack 6, harness 10, bellows 2 provide compensation temperature deformations, and the implementation of fasteners in the form of truncated cones 12 and 13 ensures the transmission of cold with minimal losses. 3 il.

Description

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The invention relates to a cryogenic technique, mainly cold conduits with screen-vacuum insulation, and can be used to transfer cold along two levels with the adjustment of the cooling object relative to the source of cold.

The aim of the invention is to provide the possibility of simultaneous transfer of cold to a higher temperature level while reducing losses. cold in the low-temperature element i

Figure 1 shows a cold pipeline, incision; figure 2 - section aa in figure 1; FIG. 3 is a diagram of a vacuum pipeline evacuation.

The cold line includes a metal casing 1 made of shells connected by a sylphon 2, located in it with the formation of an annular gap low-temperature heat-conducting element 3 and screen-vacuum insulation 4. Element 3 includes a rod 5 connected at one end to a low-level cooling source A flexible insert in the form of two series-connected packages 6 of mutually perpendicularly oriented plates and tip 7, made of a material with a high thermal conductivity coefficient, for example, “from copper.

The refrigerant pipe is provided with an additional heat-conducting element 8 placed in the annular gap between the skin 1 and the low-temperature heat-conducting element 3 and including a perforated pipe 9 connected at one end to a higher temperature level cooling source and connected with harnes 10 with a holder 11 for fastening to cooling object. The pipe 3, the harnesses 10 and the holder 11 is made of a material with a high thermal conductivity, for example of copper. The execution of the perforated pipe 9 ensures the creation of a single vacuum cavity inside the casing 1.

The cold line contains fasteners made of a material with a low coefficient of thermal conductivity, for example made of fiberglass, made in the form of truncated cones 12 and 13, directed by smaller bases towards the object to be cooled. In this case, the walls of the elements are attached in the area of large bases to the casing 1 and to the additional heat-conducting element 8, and in the area of the smaller bases, respectively, to the additional element 8 and to the low-temperature heat-conducting element 3,

The cold pipeline works as follows.

During the installation of the cooling pipeline, the cavity of the casing 1 is evacuated by pumping air through the fitting of the cooling source housing (see FIG. 3). The ends of the insulating material (e.g. tissue paper) dock with the insulation of the source and the object of cooling.

Cold from a source of low temperature cooling, for example, an inert gas of argon with a temperature of 80 K, is transferred through a heat-conducting rod 5, a pack of 6 plates and a tip 7 to the cooling object. Cold from a source of cooling at a higher temperature level, such as hardened heptane, is transferred through pipe 9, tows 10 and boime 11 to the cooling object.

The proposed device provides the ability to transmit the cold of two temperature levels, while reducing the loss of cold during transmission through the low-temperature element by placing it inside the thermally conductive element 8, the temperature level of which is higher than in element 3 but lower than in the environment , and which takes away some of the heat from the casing 1.

When temperature drops occur between the sources of cooling of the first and second levels and the object being biased, flexible elements — mutually perpendicularly arranged plates of packages 6, harnesses 10, axially located in the holder 11, bellows 2 of the casing 1 — ensure reliable compensation of temperature deformations. A flexible connection of these elements and a tip 7 movably connected to the rod 5 provide for adjustment movements of the coolant relative to the object to be cooled.

The loss of cold during transmission due to heat leakage from the outside to the pipe 9 and the rod 5 is significantly reduced due to the fastening system of the pipe and the rod with low heat-conducting glass fiber plastic supports in the form of rigid thin-walled cones 12 and 13, the thermal resistance of which is increased due to the considerable length. Fiberglass allows for braking, hitting, hitting the shots. conditions 5, since the supports make all the effort that occurs in the structure of the cold pipeline.

The flexibility of the cold pipeline ensures the reliability of the thermal connection of the cooling object to the cooling sources for a long time under vibration conditions with a large temperature difference.

Claims (1)

Invention Formula A cold line including a casing coaxially located therein with the formation of an annular gap is a low-temperature heat-conducting element and a screen-vacuum insulation, characterized in that, in order to enable the simultaneous transmission of cold Q g 0 loss of cold in the low-temperature element, the cold line is equipped with an additional heat-conducting element placed in the annular gap between the casing and the low-temperature heat-conducting element, and two fastening elements of a material with a low thermal conductivity, made in the form of truncated cones, the walls of which are attached in the zone of large bases to the casing and to the additional heat-conducting element, and in aon of smaller bases, respectively - to the additional element and to the low-temperature element y, the latter comprising a rod, a flexible insert in the form of two series-connected packages of mutually perpendicularly oriented plates and a tip, and the additional heat-conducting element comprises a perforated tube connected by cords with a yoke temperature level with a reduction of 25 f of attachment to the cooling object. (rig.g. Editor I.Rybchenko Compiled by I.Shabalina Tehred M.Hodanich Order 4850/33 Circulation 462 VNISh of the State Committee on Inventions and Discoveries at the State Committee for Science and Technology, USSR 113035, Moscow, Zh-35, 4/5 Raushsk nab. Production and Publishing Combine Patent, Uzhgorod, st. Gagarin, 101 Proofreader V.Girn to Subscription