Pipe cover, pipe structure and vehicle

Patent metadata

Field	Value
Publication number	US-9593798-B2
Application number	US-201214130735-A
Country	US
Kind code	B2
Filing date	Jul 10, 2012
Priority date	Jul 12, 2011
Publication date	Mar 14, 2017
Grant date	Mar 14, 2017

Abstract

A novel pipe cover is disclosed that can suppress thermal deterioration in a member that is positioned opposite to the pipe, and can control the temperature inside the pipe within a given range, even when a high-temperature fluid circulates through the pipe. The pipe cover is used to cover the outer periphery of a pipe, and includes a base that is formed of a tubular heat insulator, and a surface member that covers the outer surface of the base, a heat radiation section and a heat radiation-suppressing section being provided on the outer surface of the surface member, and the emissivity of the heat radiation section at a wavelength of 2 to 15 μm being higher than the emissivity of the heat radiation-suppressing section at a wavelength of 2 to 15 μm.

First claim

The invention claimed is:

1. A pipe cover that is capable of covering an outer periphery of a pipe, the pipe cover comprising:
a base that is formed of a tubular heat insulator, and a surface member that covers an outer surface of the base, a heat radiation section and a heat radiation-suppressing section being provided on an outer surface of the surface member,
wherein the heat radiation section, formed of a ceramic thin film or a carbon thin film, is provided on a portion of the outer surface of the surface member, and the heat radiation-suppressing section is provided on a portion of the outer surface of the surface member opposite from the heat radiation section, and
an emissivity of the heat radiation section at a wavelength of 2 to 15 μm being higher than an emissivity of the heat radiation-suppressing section at a wavelength of 2 to 15 μm,
wherein the surface member is formed of a metal thin film, and the heat radiation-suppressing section is formed of a coating film of an antioxidant that suppresses oxidation of a metal that forms the surface member.

2. The pipe cover according to claim 1 , wherein the heat radiation section is formed of an oxide film of a metal that forms the surface member.

3. The pipe cover according to claim 1 , wherein the emissivity of the heat radiation section at a wavelength of 2 to 15 μm is 60 to 99%.

4. The pipe cover according to claim 1 , wherein the emissivity of the heat radiation-suppressing section at a wavelength of 2 to 15 μm is 0.1 to 40%.

5. A pipe structure comprising a pipe, and the pipe cover according to claim 1 that covers an outer periphery of the pipe.

6. A vehicle comprising the pipe structure according to claim 5 .

7. The vehicle according to claim 6 , wherein the pipe structure is an automotive exhaust gas discharge pipe structure.

8. The pipe cover according to claim 1 , wherein the emissivity of the heat radiation section at a wavelength of 2 to 15 μm is 60 to 99%.

9. The pipe cover according to claim 2 , wherein the emissivity of the heat radiation section at a wavelength of 2 to 15 μm is 60 to 99%.

10. The pipe cover according to claim 1 , wherein the emissivity of the heat radiation-suppressing section at a wavelength of 2 to 15 μm is 0.1 to 40%.

11. The pipe cover according to claim 1 , wherein tubular heat insulator is an inorganic material.

Assignees

• Niwa Takahiro
• Hiraoka Akinao
• Fujita Yoshifumi
• Tsukahara Keiji
• Onodera Masatake
• Ando Daisuke
• Abe Isami
• Nichias Corp

Inventors

• Niwa Takahiro
• Hiraoka Akinao
• Fujita Yoshifumi
• Tsukahara Keiji
• Onodera Masatake
• Ando Daisuke
• Abe Isami

Classifications

• F01N2510/02

  for thermal insulation · CPC title

• F01N2260/02

  for cooling the device · CPC title

• F16L59/08 Primary

  Means for preventing radiation, e.g. with metal foil · CPC title

• F01N2470/00

  Structure or shape of exhaust gas passages, pipes or tubes · CPC title

• F16L59/029

  layered · CPC title