Matrix material for regenerators

• US 4,874,677 A
• Filed: 09/20/1988
• Issued: 10/17/1989
• Est. Priority Date: 11/02/1987
• Status: Expired due to Fees

• Current Assignee: Veb Hochvakuum Dresden
• Original Assignee: Veb Hockvakuum Dresden
• Inventors: Thuerk, Matthias, Reiche, Dieter, Duerselen, Roderich
• Primary Examiner(s): ROSENBERG, PETER
• Application Number:
  US07/247,021
• Time in Patent Office: 392 Days
• Field of Search: 428/605
• US Class Current: 428/605
• CPC Class Codes: C25D 3/34 of lead
• CPC Class Codes: F02G 1/057 Regenerators
• CPC Class Codes: F25B 2309/003 characterised by construction or composition of the regenerator
• CPC Class Codes: F25B 9/14 characterised by the cycle used, e.g. Stirling cycle
• CPC Class Codes: Y10T 428/12424 Mass of only fibers

Abstract

A matrix material for regenerators, comprises a stable basic mesh with wire diameters between 0.005 and 0.015 mm and a lead sheathing with a thickness of 0.025 to 0.075 mm. This lead screen mesh can be stacked very easily to form a matrix material. In order to form the mesh, an available fine-mesh metallic screen mesh, for example, of brass, bronze, or high-grade steel, is etched by a wet chemical or electrochemical means, until the mesh has been thinned down to the required wire thickness of between 0.005 an 0.015 mm. Subsequently, this thinned-down mesh is electroplated with lead up to the desired technological mesh width, or is coated with a lead layer that is 0.025 to 0.075 mm thick.

Claims

1. A matrix material for regenerators, comprising a plurality of screen meshes, each of which consist of a stable basic mesh, with wire diameters between 0.005 and 0.015 mm and of a lead sheathing with a thickness of 0.025 to 0.075 mm, is layered into a stack.

2. The matrix material of claim 1, wherein, between the screen meshes that are sheathed with lead and alternating with them, a different screen mesh with similar geometry, or foils with greater gas permeability and low heat conductivity, are disposed.

3. The matrix material of claim 1, wherein the other screen mesh comprises the stable basic mesh.

4. A method for producing a fine-mesh lead-sheathed screen for use as matrix material of regenerators, comprising thinning a stable wire screen mesh down by electrochemical or wet chemical means to a residual wire thickness of less than 0.015 mm, and subsequently electroplating the thus thinned mesh with lead up to the required layer thickness.