Decompression heat-insulating pipe structure

• US 10,443,776 B2
• Filed: 01/24/2018
• Issued: 10/15/2019
• Est. Priority Date: 02/15/2017
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Yamashita, Osamu
• Primary Examiner(s): Schneider, Craig M
• Assistant Examiner(s): Deal, David R
• Application Number:
  US15/878,712
• Publication Number:
  US 20180231170A1
• Time in Patent Office: 629 Days
• Field of Search: 138148
• CPC Class Codes: B01J 10/005 carried out at high temperatures in the presence of a molten material
• CPC Class Codes: B01J 12/005 carried out at high temperatures, e.g. by pyrolysis
• CPC Class Codes: B01J 19/0073 Sealings sealings for pressure vessels per se F16J15/00
• CPC Class Codes: C21D 9/0006 Details, accessories not peculiar to any of the following furnaces control devices C21D11/00
• CPC Class Codes: F16J 15/061 with positioning means F16J15/0831 takes precedence
• CPC Class Codes: F16L 27/11 the sleeve having the form of a bellows with multiple corrugations
• CPC Class Codes: F16L 27/12 allowing substantial longitudinal adjustment or movement by use of screw-thread F16L15/02
• CPC Class Codes: F16L 51/02 making use of bellows or an expansible folded or corrugated tube
• CPC Class Codes: F16L 51/025 with several corrugations
• CPC Class Codes: F16L 59/065 using vacuum F16L59/075 takes precedence
• CPC Class Codes: F16L 59/143 Pre-insulated pipes
• CPC Class Codes: F16L 9/18 Double-walled pipes; Multi-channel pipes or pipe assemblies
• CPC Class Codes: F27D 3/0025 Charging or loading melting furnaces with material in the solid state
• CPC Class Codes: F27D 3/0033 charging of particulate material
• CPC Class Codes: F27D 3/18 Charging particulate material using a fluid carrier
• CPC Class Codes: F27D 99/0073 Seals

Abstract

Provided is a decompression heat-insulating pipe structure that can be used in the system operating at high temperatures. A decompression heat-insulating pipe structure of the present disclosure includes: an outer tube and an inner tube each having a flange; and a seal member between the flanges, the seal member being configured to keep a space between the outer tube and the inner tube in a decompression state, and a shifting means configured to shift the outer tube and the inner tube relatively so as to selectively dispose the tubes at a pressing position to press the seal member between the flanges and at a cancellation position to cancel the pressing of the seal member.

Claims

1. A decompression heat-insulating pipe structure comprising an outer tube and an inner tube each having a flange;

and a seal member between the flanges, the seal member being configured to keep a space between the outer tube and the inner tube in a decompression state, further comprising;

a shifting means configured to shift the outer tube and the inner tube relatively so as to selectively dispose the tubes at a sandwiching position to sandwich the seal member between the flanges and at a cancellation position to cancel sandwiching of the seal member.

2. The decompression heat-insulating pipe structure according to claim 1, further comprising a control means configured to control the shift means, wherein

the control means controls the shifting means to, when an amount of temperature rise of the inner tube at the sandwiching position reaches a predetermined value, move the outer tube or the inner tube to dispose the outer tube or the inner tube from the sandwiching position to the cancellation position and then dispose the outer tube or the inner tube from the cancellation position to the sandwiching position again.

3. The decompression heat-insulating pipe structure according to claim 2, wherein

the outer tube has a first flange extending radially inward from an axially one end thereof, and a second flange extending radially outward from the axially other end thereof,

the inner tube has a third flange extending radially inward from an axially one end thereof, and a fourth flange extending radially outward from the axially other end thereof, the third flange being opposed to the first flange at an axially inward position of the first flange, and the fourth flange being opposed to the second flange at an axially outward position of the second flange, and

the seal member includes a first seal member between the first flange and the third flange, and a second seal member between the second flange and the fourth flange.

4. The decompression heat-insulating pipe structure according to claim 3, wherein at least one of the outer tube and the inner tube includes a bellows that can elongate or contract axially due to elastic deformation.