# US 4,397,156 A · Displacer for low-temperature refrigerating machines

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 4,397,156 A
- Document ID: US4397156A
- Status: Granted
- Kind: A
- Application number: 06/313,697
- Filed: 1981-10-21
- Granted: 1983-08-09
- Earliest claimed: 1980-11-26
- Assignees: Leybold-Heraeus GmbH
- Inventors: Rolf Heisig; Hans-Hermann Klein; Karl-Heinz Volker
- Web page: https://patentgrep.com/patent/US4397156A

## CPC

- F25J 5/002: {for continuously recuperating cold, i.e. in a so-called recuperative heat exchanger}
- F25B 9/14: characterised by the cycle used, e.g. Stirling cycle
- F25B 2309/003: characterised by construction or composition of the regenerator
- F25J 2205/24: using regenerators, cold accumulators or reversible heat exchangers
- F25J: LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS {OR LIQUEFIED GASEOUS} MIXTURES BY PRESSURE AND COLD TREATMENT {OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE (cryogenic pumps F04B37/08; gas storage vessels, gas holders F17; filing vessels with, or discharging from vessels, compressed, liquefied or solidified gases F17C; refrigeration machines, plants, or systems F25B)}
- F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS

## Abstract

A displacer for low-temperature refrigerating machines having a regenerator disposed in a hollow space of the displacer, wherein the regenerator is formed at least in part of a sintered material, preferably sintered bronze spheres.

## Claims

### Claim 1

In a displacer for a low-temperature refrigerating machine, the displacer having a hollow space with one end of the hollow space adapted for receiving and exhausting a working gas and the other end adapted for communicating with an expansion space and a regenerator of low heat conductivity in the hollow space, the improvement to the displacer comprising: a sintered material member closing the hollow space at least at one end of the displacer, whereby the sintered material may form at least part of the regenerator in the hollow space.

### Claim 2 (depends on 1)

The displacer according to claim 1, wherein the sintered material comprises sintered bronze spheres.

### Claim 3 (depends on 1, 2)

The displacer according to claim 1 or claim 2, wherein the hollow space is elongated and the regenerator comprises a plurality of sintered-metal disks spaced from each other in a row, each disc being generally normal to the longitudinal axis of the hollow space.

### Claim 4 (depends on 1, 2)

The displacer according to claim 1 or claim 2, and further comprising a sintered-material member closing the other end of the hollow space, whereby the remaining hollow space between the sintered members may be filled with regenerator material.

### Claim 5 (depends on 1, 2)

The displacer according to claim 1 or claim 2, and further comprising a cup-shaped element having its inner portion inserted into the other end of the hollow space.

### Claim 6 (depends on 5)

The displacer according to claim 5, wherein the cup-shaped element comprises a plastic and wherein its flanged portion serves to limit the displacer movement.

### Claim 7 (depends on 6)

The displacer according to claim 6, wherein the cup-shaped element comprises means for attachment of a further displacer stage.

### Claim 8 (depends on 5)

The displacer according to claim 5, wherein the cup-shaped element comprises a sintered material and has a bottom portion closing the other end of the hollow space.

### Claim 9 (depends on 8)

The displacer according to claim 8, wherein the cup-shaped element comprises means for attachment of a further displacer stage.

### Claim 10 (depends on 8)

The displacer according to claim 8, wherein a separate damping element made of a plastic is provided on the cup-shaped element.

### Claim 11 (depends on 8)

The displacer according to claim 8, further comprising a cup-shaped damping element fitted cup-to-cup in the cup-shaped sintered element.

### Claim 12 (depends on 1)

The displacer according to claim 1, having a one-piece construction, except for the regenerator material.

### Claim 13 (depends on 12)

The displacer according to claim 12, further comprising a drive piston integral therewith.