SU757814A1 - Microrefrigerator - Google Patents

Description

The invention relates to refrigeration and can be used in throttle refrigeration for various purposes.

Known are choke microcoolers, containing a cryostat and a tubular heat exchanger placed in it with an unregulated choke [1]. The disadvantage of these micro refrigerators' is a low consumption of the working fluid during the starting period, which significantly increases the duration of the exit to the mode.

This disadvantage is significant

ten

degrees eliminated in choke micro coolers containing a cryostat and a tubular heat exchanger placed in it with an adjustable choke at the cold end [2].

The closest to the proposed micro-fridge, mainly for cooling radiation detectors, contains a heat exchanger in the form of a coil wound on a hollow core and located on a cold one. 25

the end of the heat exchanger is a throttling unit with a flow regulator consisting of a seat and a valve connected through a thrust to the warm end of the heat exchanger [3].

The disadvantage of the known micro-refrigerator is a long starting period.

The purpose of the invention is to reduce the starting period.

This goal is achieved by the fact that the microcooler additionally contains heat lines in the form of flexible perforated metal membranes with high thermal conductivity, which have a heat contact with a core and a core, with the thrust being made of a material with a greater linear expansion coefficient than the core material.

FIG. 1 shows schematically the cold end of a micro-refrigerator; in fig. 2 shows section A-A in FIG. one.

The microcooler contains a heat exchanger 1 in the form of a coil wound on a hollow core 2, and a throttling unit located on the cold end of the heat exchanger with an flow regulator consisting of a saddle 3 and valve 4 connected by a thrust 5 to a warm end of the heat exchanger 1. The thrust 5 is made of material with a large linear expansion coefficient than the core material 2. The cyclone cooler also contains tep3

757814

four

The conduit 6 is in the form of flexible perforated membranes of metal with a high thermal conductivity, for example, of copper. The heat pipes 6 are in thermal contact with the pitch and the core, which is provided by soldering or welding. One of the heat lines 6 may be attached to the saddle 3. The design of the heat lines 6 may be in the form of spirals, hinged bridges, cross-shaped plates, etc. Micro-refrigerator is located in the cryostat 7.

The choke micro cooler is running / melting as follows. "

The working fluid under pressure is supplied to the heat exchanger 1 and, cooled down by the return flow, enters the throttling unit, where it expands in the annular gap between the saddle 3 and the valve 4. At the same time, its temperature decreases. After the object is cooled, the working fluid is removed by the microcooler over the intertubular space of the heat exchanger 1, bounded by the core 2 and the inner wall of the cryostat 7.

During the start-up period, the working fluid after expansion cools not only the object, but also the cold part of the micro-refrigerator, with part of the heat of the core 2 through the heat lines 6, the thrust 5 and the Valve 4 is diverted to the working body. Since in the gap between the saddle 3 and the valve 4 the speed of the working fluid is greatest, the heat transfer coefficient is also maximum here, which contributes to a faster cooling of the core. Along with this, the heat pipes 6 eliminate the negative impact on

the duration of the starting period differences in the heat capacities of the core 2

and thrust 5.

With an appropriate selection of core and thrust materials, the installation of flexible heat pipes reduces the starting period by 25–40% compared to known micro coolers.

Claims (1)

Claim Microcooler, mainly for cooling radiation receivers, containing a heat exchanger in the form of a coil wound on a hollow core, and a throttling unit located on the cold end of the heat exchanger with a flow regulator consisting of a saddle and a valve connected to the warm end of the heat exchanger by means of thrust, characterized in that In order to reduce the start-up period, the microcooler additionally contains heat lines in the form of flexible perforated membranes of high-conductivity metal contact with the core and the core, and the rod is made of a material with a greater coefficient of linear expansion than the core material.