초록 ▼

The invention relates to a heat exchange device including at least one heat exchange wall (6) between the refrigerant fluid (3) and the fluid to be cooled (4) having on one side a so-called hot surface (7) in contact with the fluid to be cooled, and at least one mechanical system (10) antagonist to

The invention relates to a heat exchange device including at least one heat exchange wall (6) between the refrigerant fluid (3) and the fluid to be cooled (4) having on one side a so-called hot surface (7) in contact with the fluid to be cooled, and at least one mechanical system (10) antagonist to the deposition on the hot surface of the exchange wall, of a solid layer of the fluid to be cooled. According to the invention, the means antagonist to the deposition is formed with a friction means (11) including a planar surface extending parallel to the hot surface of the exchange wall and having a heat conductivity such that the ratio of the heat conductivities of said friction means on the hot surface is larger than or equal to 3, and the mechanical system (10) includes means for supporting the friction means, adapted so that the latter rubs on the hot surface of the exchange wall via its planar surface.

대표청구항 ▼

What is claimed is: 1. A heat exchange device for exchanging heat between a refrigerant fluid and a fluid to be cooled to a solidification limit, the heat exchange device including: a first fluid flow circuit containing the refrigerant fluid; a second fluid flow circuit containing the fluid to be c

What is claimed is: 1. A heat exchange device for exchanging heat between a refrigerant fluid and a fluid to be cooled to a solidification limit, the heat exchange device including: a first fluid flow circuit containing the refrigerant fluid; a second fluid flow circuit containing the fluid to be cooled to the solidification limit and independent of the first fluid flow circuit; at least one heat exchange wall disposed between the first and second fluid flow circuits, the heat exchange wall having a first, cold surface in contact with the refrigerant fluid, and an opposite, hot surface in contact with the fluid to be cooled; and at least one mechanical system to prevent deposition on the hot surface of a solid layer of the fluid to be cooled, the mechanical system comprising a friction means having a planar surface extending parallel to the hot surface, means for supporting the friction means constructed and arranged such that the planar surface is in frictional contact with the hot surface, and means for displacing the friction means in rotation relative to the hot surface to scrape the hot surface, wherein the planar surface has a width between 30 and 120 mm, and the hot surface and the friction means have heat conductivities in a ratio of the heat conductivity of the hot surface to the heat conductivity of the friction means of at least 3. 2. The device according to claim 1, wherein the heat conductivity ratio is between 20 and 50. 3. The device according to claim 1, wherein the width of the planar surface is about 40 mm. 4. The device according to claim 1, wherein the friction means is formed with a wiping arm and the planar surface is delimited by at least one beveled edge, the friction means being rotationally mounted around a rotor and actuated by pressure means to form the mechanical system. 5. The exchange device according to claim 4, wherein the wiping arm has a planar surface made of a material having a friction coefficient between 0.01 and 0.3. 6. The exchange device according to claim 1, wherein the planar surface is formed with a spongy absorbent material, so as to retain thereon a solid layer of the fluid to be cooled to rub on the hot surface. 7. The exchange device according to claim 1, wherein the mechanical system includes a rotor and an arm rotationally mounted around the rotor, and fitted with an absorbing means. 8. The exchange device according to claim 7, wherein the arm is rotationally mounted around an axis extending substantially perpendicularly to the hot surface, which extends in a plane. 9. The exchange device according to claim 1, additionally comprising at least one second heat exchange wall. 10. The exchange device according to claim 9, wherein the heat exchange walls are formed by disks extending at a distance from each other and closed at their periphery in order to form an enclosure for the fluid flow circuit for the fluid to be cooled. 11. A cold-producing machine including at least one heat exchange device according to claim 1. 12. In a heat exchange device, a method for preventing deposition of a solid layer of a fluid to be cooled on a hot surface in contact with the fluid to be cooled, the hot surface extending on one side of a heat exchange wall between the fluid to be cooled and a refrigerant fluid, an opposite side of the heat exchange wall having a cold surface in contact with the refrigerant fluid, comprising wiping the hot surface by a friction means including a planar surface rubbing on the hot surface, the heat conductivities of the friction means and the hot surface being in a ratio of at least 3, the planar surface having a width of between 30 and 120 mm.