Line element with damping element

Abstract

A line element includes an inner element, an outer element surrounding the inner element, and a damping element arranged between the inner element and the outer element. The damping element can be made, for example, of knitted wire fabric or a stripwound hose. The damping element can be made in particular of a more easily wearing material than the outer element and/or the inner element, for example of copper.

Claims

1. A line element, comprising: an inner element made of a flexible stripwound hose; an outer element arranged in surrounding relation to the inner element and made of a corrugated bellows, a membrane bellows structure or a wound bellows structure; and a damping element arranged between the inner element and the outer element, said damping element comprising or made of a wound corrugated winding strip having laterally overlapping or interlocking sides formed between adjacent strips to form a flexible stripwound hose.

2. The line element of claim 1, wherein the damping element is made of a material that wears off easier than a material of the inner element or the outer element.

3. The line element of claim 1, wherein the damping element comprises or is made of at least one material selected from the group consisting of copper, copper alloy, bronze, aluminum, aluminum alloy, stainless steel, steel, zinc, zinc phosphate, titanium, tantalum, ceramics, nickel, nickel-based alloy, graphite, aramid, brass, molybdenum sulfide, and any combination thereof.

4. The line element of claim 1, wherein at least one of the damping element, the inner element, and the outer element is conditioned at least locally on a surface.

5. The line element of claim 4, wherein the surface is conditioned by a thermal or thermochemical diffusion process or surface coating process.

6. The line element of claim 1, wherein at least one of the damping element, the inner element, and the outer element has a non-circular cross section at least in an axial portion of the line element.

7. The line element of claim 6, wherein the cross section is a polygonal cross-section.

8. The line element of claim 1, wherein the damping element has a stiffness which is less than a stiffness of the inner element or the outer element.

9. A line element, comprising: an inner element made of a flexible stripwound hose; an outer element arranged in surrounding relation to the inner element and made of a corrugated bellows, a membrane bellows structure or a wound bellows structure; and a damping element arranged between the inner element and the outer element, said damping element comprising or made of a corrugated bellows, a membrane bellows structure or a wound bellows structure.

10. The line element of claim 9, wherein the damping element is made of a material that wears off easier than a material of the inner element or the outer element.

11. The line element of claim 9, wherein the damping element comprises or is made of at least one material selected from the group consisting of copper, copper alloy, bronze, aluminum, aluminum alloy, stainless steel, steel, zinc, zinc phosphate, titanium, tantalum, ceramics, nickel, nickel-based alloy, graphite, aramid, brass, molybdenum sulfide, and any combination thereof.

12. The line element of claim 9, wherein at least one of the damping element, the inner element, and the outer element is conditioned at least locally on a surface.

13. The line element of claim 12, wherein the surface is conditioned by a thermal or thermochemical diffusion process or surface coating process.

14. The line element of claim 9, wherein at least one of the damping element, the inner element, and the outer element has a non-circular cross section at least in an axial portion of the line element.

15. The line element of claim 14, wherein the cross section is a polygonal cross-section.

16. The line element of claim 9, wherein the damping element has a stiffness which is less than a stiffness of the inner element or the outer element.

Description

BRIEF DESCRIPTION OF THE DRAWING

(1) In the following, the invention will be explained in more detail by way of example with the aid of the figures. It is shown in:

(2) FIG. 1 a longitudinal section through a line element according to the invention with a knitted wire fabric as a damping element;

(3) FIG. 2 various possible strip geometries of the inner element, the outer element, and the damping element;

(4) FIG. 3 cross sections through line elements according to the invention with an oval, triangular, quadrangular, pentagonal and hexagonal inner element,

(5) FIG. 4 a longitudinal section through a line element according to the invention with a stripwound hose as a damping element.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

(6) FIG. 1 shows a longitudinal section through a decoupling element or line element 100 in accordance with the invention, which is formed from the stripwound hose 120 as inner element (in the figures also designated as “IE”), an outer element 110 (“AE”), and a damping element 130 (“DE”). In the example shown, the outer element AE is a ring-corrugated membrane bellows 110.

(7) The damping element 130 may extend axially over the entire length or only over a part of the line element 100.

(8) The damping element 130 is formed for example by a knitted fabric of copper wire. This knitted copper fabric is drawn over the inner element 120 during assembly of the line element 100 and then mounted in the envelope of the outer element 110.

(9) The advantages of the illustrated decoupling element 100 reside in a lesser manufacturing complexity, the use of standard components, and good damping properties. Furthermore, the wire thickness of the damping element 130 enables virtual “adjustability” of the service life thereof.

(10) The knitted fabric can preferably be single-thread, two-thread, three-thread, four-thread or multi-thread. The wire of the knitted fabric typically has a diameter of approx. 0.1 up to 0.5 mm, preferably from approx. 0.5 mm to 1.0 mm, or from approx. 1.0 mm to 2.6 mm.

(11) The material of knitted fabric for the damping element 130 contains or is made of preferably copper, copper alloys, bronze, aluminum and other non-ferrous metals. Different materials can hereby be knitted when more than 2 threads are present.

(12) Further, the wire of the damping element 130 can have coatings having friction-optimized, strength-increasing or similar functions.

(13) FIG. 2 illustrates (not exhaustive) various possible strip geometries of the inner element IE (shown in the longitudinal section as one, two or three strip turns). Shown are an interlocking hose 120a, an interlocking hose 120b with outer scale, a double-scale interlocking hose 120c with inner scales and outer scales, as well as further overlapping and/or interlocked geometries 120d-120k. The material of the inner element IE is preferably stainless steel. The thickness of the winding strip is typically approx. 0.07 mm to 0.26 mm, preferably approx. 0.26 mm to 0.5 mm.

(14) In preferred embodiments, the inner element IE or the outer element AE has a non-round cross-section (while the respectively other element of the line element has a round cross-section). It is particularly preferred when the inner element IE has a non-round and the outer element AE has a round cross-section,

(15) FIG. 3 illustrates in this regard, five front views of variants of a line element with a non-round inner element 120 and a circular outer element 110. The associated damping element 130 is also shown with a circular cross-section; it will, however, normally assume a shape, which more or less matches the available space.

(16) Shown is an inner element with an oval, a triangular, a quadrangular, a pentagonal, and a hexagonal cross-section, though any other non-round geometries are possible.

(17) FIG. 4 shows a longitudinal section for a further embodiment of a line element 200 through an axial section of the wall. The line element 200 includes the following components: An inner element 220 or IE, which is formed, for example, from an interlocking hose 120b according to FIG. 2. A damping element 230 or DE, which is formed, for example, from an interlocked stripwound hose 120e according to FIG. 2. Preferably, this damping element 230 is made of a softer material than the adjacent inner element 220 or outer element 210, for example of copper or a copper-containing material. Furthermore, its stiffness is preferably less than that of the inner element 220 and/or that of the outer element 210. An outer element 210 or AE, which is made here from a wound membrane bellows.

(18) The damping element 230 is arranged coaxially between the inner element 220, lying on the inside, and the outer element 210, lying on the outside. Due to the contact with the inner element 220 and outer element 210, the stripwound hose 230 acts in a dampening manner and through suitable selection of its material prevents wear of inner element 220 and outer element 210.

(19) The geometries shown in FIG. 2 may, of course, also be realized with a stripwound hose as a damping element, wherein the stripwound hose may have a round cross section or also a non-round cross-section. A non-round cross-section preferably has the same geometry (oval, triangular, quadrangular, pentagonal, etc.) as the non-round inner element (or the outer element if the latter is non-round). Furthermore, a non-round damping element DE can be combined with a round outer element and a round inner element.

(20) In all line elements shown in the figures, the outer element AE can optionally be formed by a stripwound bellows, corrugated bellows or a rotationally symmetrical or helical corrugated membrane bellows which is welded in the upper profile area. Examples of such outer elements AE can be found in DE 10 2008 001 297 A1, DE 10 2011 053 131 A1, and DE 10 2013 104 446 A1.