# US 2019/0120529 A1 · Cryogenic device with compact exchanger

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- Number: US 2019/0120529 A1
- Document ID: US20190120529A1
- Status: Published application
- Kind: A1
- Application number: 16/094,328
- Filed: 2017-06-02
- Published: 2019-04-25
- Earliest claimed: 2016-06-06
- Assignees: Societe Francaise de Detecteurs Infrarouges-Sofradir
- Applicants: Societe Francaise De Detecteurs Infrarouges- Sofradir
- Inventors: Jean-Christophe Terme; Ahmad Sultan
- Web page: https://patentgrep.com/patent/US20190120529A1

## CPC

- F25B 9/02: using Joule-Thompson effect; using vortex effect
- F25B 41/37: Capillary tubes
- F28D 7/024: {the conduits of only one medium being helically coiled tubes, the coils having a cylindrical configuration}
- F28F 13/003: {by using permeable mass, perforated or porous materials (F28F13/18 takes precedence)}
- F25B 2309/022: characterised by the expansion element
- F25B 2341/062: Capillary expansion valves
- F25B 2400/052: between the capillary tube and another part of the refrigeration cycle
- F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F28D: HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT (fluid heaters having heat generating means and heat transferring means F24H; furnaces F27; details of heat-exchange apparatus of general)
- F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16)

## Abstract

This cold generation device implements the “Joule-Thomson” expansion principle. It includes a heat exchanger having a fluid under high pressure and under low pressure circulating in counterflow therethrough. The heat exchanger is formed of the stack of pellets (5) made of a porous material, and particularly a sintered material, forming a cylindrical mandrel, having a capillary (10) wound at the periphery thereof and in contact therewith, the capillary having the high-pressure fluid circulating therethrough, the low-pressure fluid circulating in counterflow inside of the porous mandrel thus formed.

## Claims

### Claim 1

A cold generation device implementing the “Joule-Thomson” expansion principle, comprising a heat exchanger having a fluid under high pressure and under low pressure circulating in counterflow therein,
wherein the heat exchanger is formed of the stack of pellets made of a porous material, and particularly a sintered material, forming a cylindrical mandrel, having a capillary wound at the periphery thereof and in contact therewith, the capillary having the high-pressure fluid circulating therethrough, the low-pressure fluid circulating in counterflow inside of the porous mandrel thus formed;
and wherein a thermally-insulating porous element is interposed between each of the pellets.

### Claim 2 (depends on 1)

The cold generation device of claim 1, wherein the porous thermally-insulating element is formed of a fabric, particularly made of fiber glass.

### Claim 3 (depends on 1)

The cold generation device of claim 1, wherein the pellets have a cylindrical shape, wherein the thermally-insulating intercalary elements have a circular shape, and wherein the diameter of the intercalary elements is smaller than or equal to the external diameter of the pellets.

### Claim 4 (depends on 1)

The cold generation device of claim 1, wherein the pellets are made up of sintered silver or copper.

### Claim 5 (depends on 1)

The cold generation device of claim 1, wherein the capillary is made of metal, particularly of copper, of stainless steel, or of cupronickel alloy.

### Claim 6 (depends on 5)

The cold generation device of claim 5, wherein the capillary receives a silver deposit, which is a function of the nature of the material forming the pellets, said deposit being realized before the winding of the capillary on the mandrel formed by the stack of pellets.

### Claim 7 (depends on 1)

The cold generation device of claim 1, wherein the spirals defined by the winding of the capillary around the mandrel formed by the stack of pellets are not in contact with one another.

### Claim 8 (depends on 7)

The cold generation device of claim 7, wherein a thermally-insulating yarn is wound on the intervals separating the spirals, said yarn being particularly made up of fiber glass.