SU1651055A1 - Magnetocaloriphic refrigerator - Google Patents

Abstract

The invention relates to a cryogenic technique and allows extending the range of operating temperatures and simplifying the design of the refrigerator. During the rotation of the permanent magnets 10 with pole tips 11, the blocks of workers with bodies of magnetic flux concentrators 9 mounted on them are periodically magnetized (and heated J8 7Z) and demagnetized (and cooled). In one revolution of the magnets, the working medium in each block is magnetised and demagnetized twice. The heat of magnetization is removed to the environment in the heat sinks 18, the coolant cooled during demagnetization of the working fluid absorbs heat from the heat sinks. 19, the implementation of cooling capacity. The coordination of the rotation of the magnetic system and the displacement of the displacer of the supercharger 12 is provided by the control unit 14. The manufacture of magnetic flux concentrators wider than the width of the moving pole terminals of these magnetic magnets allows a more equal matching of the heat carrier flux with the change of the magnetic field. 1 il. (L I

Description

The invention relates to a cryogenic technique, namely to refrigerators operating on the basis of the magnetocaloric effect.

The purpose of the invention is to expand the range of operating temperatures and simplify the design.

The drawing shows a diagram of the refrigerator.

; The refrigerator contains blocks 1 to 8 of the working fluid, on which magnetic flux concentrators 9 are mounted, permanent magnets 1E with pole tips 11, a supercharger 12, a magnetic circuit 13, a control unit 14, pipelines 15 connecting the working fluid blocks in pairs, collectors 16 and 17 of the system pumping of the heat carrier, heat sinks 18 and heat sinks 19.

The working fluid of the blocks is made in the form of plates with a gap for pumping {coolant. With one revolution of magnets 10, the working fluid in each block four times changes its state, i.e. it is either magnetized or demagnetized. Hydraulically connected blocks work in out of phase, ie, in the shown state, blocks 1, 3, 5 and 7 are in the field of permanent magnets, and blocks: 2,4,6 and 8 are without a field. cold zone to warm, and through blocks 2,4,6 th 8 - on the contrary in a strictly defined amount, in the next phase of the cycle, the direction of pumping (and the magnitude of the field in the working fluid) is reversed,

In stationary mode, the working fluid has a temperature distributed over the length; from the cooling temperature (cold zone) to the ambient temperature (warm zone), and the coolant moving to the heat sink 18 is heated in the process of heat exchange with the working fluid, and is cooled when moving to the heat sink 19. Thus, in the first phase of the cycle, the heat Q _0c H3 of blocks 1,3,5 and 7 is removed to the environment as a coolant, and the coolant is cooled in blocks 2,4,6 and 8. In the next phase of the cycle, the processes are reversed , i.e. in blocks 1,

3.5 and 7, the coolant is cooled from T _OS to T _ft , and from blocks 2,

4.6 and 8, the heat of magnetization is removed to the environment.

The coordination of the rotation of the magnetic system and the displacement of the displacer blower 12 provides the control unit 14.

When the width of the fixed concentrates is greater than the width of the moving pole tips of the magnets, the maximum value of induction is achieved in a certain period of time and a more uniform distribution in time of the phases of the cycle with and without the field occurs, which makes it possible to provide reverse circulation of the coolant much more easily, the pumping time per cycle approaches the residence time working fluid under the maximum field.

Claims (1)

Claim A magnetocalrric refrigerator containing η pairs of blocks with a working fluid, where η is an even number not equal to zero ·, a magnetic system with movable magnets, the number of pairs of which is n / 2, and a system for reversing pumping of the coolant with a supercharger ”revealing that, with the goal of expanding the range of workers. In terms of temperature and structural simplification, magnets are made constant and equipped with pole tips, a magnetic flux concentrate is mounted on the blocks, and the system for reversing: the coolant pumping contains \ two ring collectors connected to the supercharger and alternately with the blocks of the working fluid.