# US 10,371,302 B2 · Heatable fluid line > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,371,302 B2 - Document ID: US10371302B2 - Status: Granted - Kind: B2 - Application number: 15/319,663 - Filed: 2015-06-16 - Published: 2017-05-11 - Granted: 2019-08-06 - Earliest claimed: 2014-06-17 - Assignees: Norma Germany GmbH - Applicants: Norma Germany GmbH - Inventors: Stephan Mann; Dragan Grcic - Web page: https://patentgrep.com/patent/US10371302B2 ## CPC - F16L 53/30: Heating of pipes or pipe systems - F01N 3/2066: {Selective catalytic reduction [SCR]} - F16L 53/38: using elongate electric heating elements, e.g. wires or ribbons - F16L 55/027: Throttle passages - F01N 2610/02: the substance being ammonia or urea - F01N 2610/10: the substance being heated, e.g. by heating tank or supply line of the added substance - F01N 2610/14: Arrangements for the supply of substances, e.g. conduits - F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL - F01N: GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (arrangements in connection with gas exhaust of propulsion units in vehicles B60K13/00; combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M35/00; protecting against, or damping, noise in general G10K11/16) ## Abstract Disclosed in a heatable fluid line (1) comprising a tube (2) with an interior, and a heating device (3) inside the interior. The aim is to protect an injection arrangement, which is connected to the fluid line (1), at low temperatures. In order to achieve said aim, a volume reducing element (5) is disposed between the tube and the heating device (3). ## Claims ### Claim 1 A heatable fluid line comprising: a pipe which has an inner space; a heating device which is constructed as a heating rod and is arranged in the inner space to delineate an annular gap between the pipe and heating device; and a volume reduction element arranged in the annular gap so that an annular portion of the annular gap remains between the volume reduction element and the pipe for a heatable fluid to flow through the pipe between the volume reduction element and the pipe, wherein the volume reduction element is constructed as a pipe piece having a cover with a cut in a longitudinal direction and a recess, which is formed by the cut in the cover of the volume reduction element in the annular gap, extends along the heating device, wherein the recess produces a region configured for the heatable fluid to flow through between the heating rod and the pipe, and wherein the volume reduction element is clip-fitted onto the heating rod. ### Claim 2 (depends on 1) The fluid line as claimed in claim 1, wherein the recess extends as far as the heating device. ### Claim 3 (depends on 2) The fluid line as claimed in claim 2, wherein the recess has in the peripheral direction of the heating device an extent which corresponds at least to a radial thickness of the volume reduction element. ### Claim 4 (depends on 1) The fluid line as claimed in claim 1, wherein the volume reduction element is at least partially formed by a hollow member which is separated in the longitudinal direction. ### Claim 5 (depends on 4) The fluid line as claimed in claim 4, wherein the hollow member has an inner cross-section which is smaller than an outer cross-section of the heating rod. ### Claim 6 (depends on 1) The fluid line as claimed in claim 1, wherein the volume reduction element is arranged with at least two portions on the heating device. ### Claim 7 (depends on 6) The fluid line as claimed in claim 6, wherein the at least two portions leave an intermediate space free between them. ### Claim 8 (depends on 7) The fluid line as claimed in claim 7, wherein the intermediate space is arranged in a curved portion of the fluid line. ### Claim 9 (depends on 1) The fluid line as claimed in claim 1, wherein the fluid line is thermo-fixed with the heating device and the volume reduction element. ### Claim 10 (depends on 1) The fluid line as claimed in claim 1, wherein, at least at one end of the pipe, a connector with a connection piece is inserted into the pipe, wherein the connection piece has a wall having a thickness which corresponds to a maximum of the thickness of the volume reduction element. ### Claim 11 (depends on 10) The fluid line as claimed in claim 10, wherein a spacing between the volume reduction element and the connection piece in the longitudinal direction corresponds to at least the thickness of the volume reduction element. ### Claim 12 A heatable fluid line comprising: a pipe which has an inner space; a heating device which is constructed as a heating rod and is arranged in the inner space to delineate an annular gap between the pipe and heating device; and a volume reduction element, which is arranged in the annular gap, includes a longitudinal cut, so that facing sides of the longitudinal cut are separatable to clip-fit the volume reduction element onto the heating device, wherein, when the volume reduction element clip-fitted onto the heating device is arranged in the annular gap, a recess, formed between the facing sides of the volume reduction element, extends along a length of the volume reduction element for guiding a heatable fluid flow between the heating device and the pipe. ### Claim 13 (depends on 12) The heatable fluid line according to claim 12, wherein, when the volume reduction element clip-fitted onto the heating device is arranged in the annular gap, an annular portion, configured for guiding the heatable fluid flow between the volume reduction element and the pipe, remains open between the volume reduction element and the pipe.