Composite Curved Pipe

Abstract

The composite curved pipe system provided by this invention includes a flexible metal inner tube and a flexible outer tube coaxially sleeved around the outer periphery of the metal inner tube. The metal inner tube provides mechanical strength to resist the pressure of the fluid inside the tube, while the outer tube protects the metal inner tube from improper external forces such as impacts. At the same time, the outer tube can provide a preliminary leak-proof effect in the event of damage to the metal inner tube.

Claims

1. A composite curved tube, comprising: a first end member including a first connector, a first recess extending from a first free end of the first connector into the interior of the first connector to a first predetermined depth; a second end member including a second connector, a second recess extending from a second free end of the second connector into the interior of the second connector to a second predetermined depth; a flexible metal inner tube, with one end of its shaft coaxially inserted into the first recess and its outer peripheral wall abutting against the wall of the first recess, and the other end of its shaft inserted into the second recess and its outer peripheral wall abutting against the wall of the second recess; and a flexible outer tube coaxially sleeved on the outer peripheral side of the metal inner tube, with one end of its shaft inserted through a hole on the outer peripheral side of the first connector and the other end of its shaft inserted through a hole on the outer peripheral side of the second connector.

2. The composite curved tube as described in claim 1, wherein, The inner metal tube is made of copper.

3. The composite curved tube as described in claim 1 further includes a limiting member that is fitted over the outer side of the outer tube and extends along the tube axis of the inner metal tube from the first free end of the first joint to both sides, in order to limit the bending curvature of the inner metal tube relative to the first joint.

4. The composite curved tube as described in claim 3, wherein, The limiting component is a variable pitch spring, having a small pitch segment corresponding to the location of the first joint and a large pitch segment corresponding to the part of the metal inner tube that is not connected to the first joint.

5. The composite curved tube as described in claim 1, wherein: The first end piece further includes a first anti-detachment portion located between the inner wall of one end of the outer sleeve shaft and the outer peripheral side of the first connector facing thereto; the second end piece further includes a second anti-detachment portion located between the inner wall of the other end of the outer sleeve shaft and the outer peripheral side of the second connector facing thereto.

6. The composite curved tube as claimed in claim 1 further includes a clamping unit disposed between the first joint and the inner metal tube to maintain the airtightness of the connection between one end of the inner metal tube shaft and the first end piece.

7. The composite curved tube as described in claim 6, wherein, The clamping unit includes a tubular clamping member, coaxially disposed on one side of the first connector away from the second end member, with the first recessed hole, and a tubular sealing member sleeved on one end of the inner metal tube, and located between the clamping member and the first end member.

8. The composite curved tube as described in claim 7, wherein, The clamping unit further includes a sealing hole extending from the side of the first connector opposite to the first free end into the first connector and coaxially communicating with the first recess, so that the space inside the hole can accommodate the sealing member and the hole wall can be combined with the clamping member.

9. The composite curved tube as described in claim 8, wherein: The diameter of the sealing hole is larger than the diameter of the first recessed hole, and an annular push-out shoulder surface is defined inside the first connector; one end of the sealing member tube shaft abuts against the annular shoulder surface with a tapered bevel.

10. The composite curved tube as described in claim 8, wherein: The clamping member is axially movable at one end of its tube shaft and is attached to the wall of the sealing hole, with the tube opening at one end of the clamping member forming an outwardly expanding push-pull surface; the other end of the sealing member's tube shaft abuts against the push-pull surface with a tapered bevel.

Images