Piping system for a fluid-carrying line

Abstract

A line system for fluid-carrying lines (3, 5, 6) comprising two dosing units (1, 2) for dosing fluid and a supply pump unit (4), which are connected to one another via a fluid line module, wherein the fluid line module consists of a first and a second connecting line (3, 6) and a connector piece (7) which connects the connecting lines (3, 6) to one another, as well as a supply line (5) which is connected to the connector piece (7), wherein the supply line (5) is connected to the supply pump unit (4) and the connecting lines (3, 6) are connected to the dosing units (1, 2), characterized in that one of the connecting lines (3, 6) is introduced through the connector piece (7) into the supply line (5) with a supply length section (3b) protruding from the connector piece (7),wherein the length of the first connecting line (3) running through the connector piece (7), including the length of the supply length section (3b), corresponds to at least one minimum line length characteristic of the line system for a connecting line (3) of a dosing unit (1, 2), and the line length of the other, second connecting line (6) up to the connector piece (7) corresponds to at least the minimum line length less the length of the supply length section (3b).

Description

[0001] The present invention relates to a line system for a fluid-carrying line comprising two dosing units for dosing fluid and a supply pump unit, which are connected to one another via a fluid line module, wherein the fluid line module consists of a first and a second connecting line and of a distributor piece which connects the connecting lines to one another, as well as of a supply line which is connected to the distributor piece, wherein the supply line is connected to the supply pump unit and the connecting lines to the dosing units.

[0002] In motor vehicles with exhaust gas aftertreatment, a so-called SCR system, it is necessary to inject a urea-water solution into catalysts at several points in the exhaust system.

[0003] Depending on the operating conditions, this occurs, for example, near the engine and / or further away from it. If, for example, sufficiently high exhaust temperatures are not achieved in the area away from the engine, injection must take place close to the engine. Injection is typically performed using a line system of the type described above. The metering units, which may be designed to be heated, are nevertheless not freeze-proof when the engine is off, meaning they cannot prevent the fluid contained within them from freezing.

[0004] Since, for example, the 32% urea-water solution used tends to freeze at temperatures as low as -11°C, it is inevitably necessary to drain the dosing modules, which are not heated when the engine is off. For this type of draining, distributor pieces, which can be T-shaped or Y-shaped, for example, are usually inserted into the heatable fluid lines. The supply pump unit, which also generates the necessary system pressure for dosing or injection, is also used for draining by switching it to suction mode. This allows the individual dosing units or dosing valves to be drained individually or together by opening them while the pump unit is in suction mode, allowing air to be drawn in. For the correct operation of such a system, especially an SCR system, certain requirements must be met during draining.

[0005] One of the two dosing valves must be completely emptied. To achieve this, the air cushion created in the respective connecting line toward the emptied dosing valve must be large enough that, when only one of the two dosing valves or one of the dosing units is operating, no fluid can enter the non-operating dosing valve or unit.

[0006] When a dosing valve or dosing unit is switched on again, no air bubbles must enter the operated connecting line by emptying the non-operating connecting line.

[0007] To achieve this, the line lengths behind the distributor, i.e., between the distributor and the dosing units, are adjusted to the respective pump output and the switching times of the pump unit in such a way that, during emptying, a sufficiently large air supply is created in the line being emptied, while the line is never emptied beyond the distributor. Such a line length is referred to as the minimum line length in this application.

[0008] For a pump unit commonly used for such systems, the respective sections of the connecting lines between the distributor piece and the dosing units must, for example, have a minimum line length of 2 m to ensure that the volume of air sucked in does not extend beyond the end of the distributor piece into the common supply line during the shortest switching cycle of the pump unit and / or during repeated suctioning at the same dosing unit, for example five suctionings at only one of the two dosing units.

[0009] The minimum line length can, however, vary depending on the design of the pump unit, its control system, and the lumens of the connecting lines. For simplified pump switching or control, long lines are usually used from the distributor piece to the dosing units, ensuring the required minimum line length of, for example, 2 m. In these known line systems, the respective lines must have minimum line lengths, which is disadvantageous, however, because in practice a dosing unit can be located closer to the distributor piece than the minimum line length allows. In order to achieve the minimum line lengths for the line sections, the connecting lines are laid in meanders, thus artificially lengthening them. This design, however, makes routing the lines on the vehicle considerably more difficult.

[0010] The present invention is based on the object of making unnecessary extensions of the connecting cables beyond the minimum cable length avoidable, so that an improved routing of the connecting cables on the vehicle is possible, while guaranteeing system safety.

[0011] DE 10 2008 006 323 A1 discloses, by way of example, an SCR system for a catalytic converter of a motor vehicle, comprising a reducing agent tank for receiving reducing agent, at least one electrically heatable liquid line for conveying reducing agent from the reducing agent tank to the catalytic converter, and a pump for pumping reducing agent through the liquid line from the reducing agent tank to the catalytic converter, wherein a plug connection connects the sections of the liquid line in a liquid-conducting manner and / or connects the liquid line in a liquid-conducting manner to a component of the SCR system, wherein the plug connection forms an electrical connecting line which, during operation, conducts a heating current for heating at least one of the liquid lines, and the male connection part of the plug connection is electrically contacted by a metallic spring element.

[0012] According to the invention, the object is achieved in that one of the connecting lines is introduced through the distributor piece into the supply line with a supply length section protruding from the distributor piece, wherein the length of the connecting line running through the distributor piece, including the length of the supply length section, corresponds to at least one minimum line length characteristic of the line system for a connecting line of a dosing unit, and the line length of the other connecting line up to the distributor piece corresponds to at least the minimum line length less the length of the supply length section.

[0013] The present invention is based on the discovery that part of the necessary so-called extraction length in the respective connecting line, which is usually located between the distributor piece and the respective dosing module, can be laid behind the distributor piece in the extraction direction. For this purpose, the invention provides for the use of a distributor piece instead of a conventional one, but rather a distributor piece in which the lumens of the individual connecting lines to the dosing units merge into a coaxial line arrangement in the region of the supply line. A coaxial arrangement does not necessarily mean a concentric arrangement. One of the connecting lines to the dosing units, in particular the one that can be shorter, can be pushed via the distributor piece into the supply line of the pump unit and can thus be adapted to the required minimum lengths up to the dosing unit.

[0014] The design according to the invention results in the fact that, although the length of the connecting lines to the dosing units can be adapted, for example, it can have a length of 1 m, the total length of this connecting line is still, for example, 2 m, which corresponds to the required minimum line length, because part of the connecting line is inserted into the supply line to the pump unit as a coaxial supply length section, for example also with a length of 1 m, or is arranged there. This makes it possible to provide minimum line lengths for the connecting lines without this having an adverse effect on the routing of the connecting lines. Furthermore, minimum line lengths can also be realized for shorter sections. According to the invention, disruptive line sections on the vehicle are thus avoided, which only serve the purpose of providing the required minimum line length.The inventive design of the piping system meets all technical requirements for emptying and re-ventilation without the need for special measures.

[0015] According to the invention, all lines, i.e., the connecting lines and the supply line, can be electrically or fluidically heated. Furthermore, all required line connectors and the distributor piece can also be electrically heated. The line section inserted into the supply line according to the invention, i.e., the supply length, can be secured in its coaxial arrangement, for example, by a material connection to the distributor piece, for example, by laser welding, sub-welding, or even by gluing. Snap-in or clamp connections on the distributor piece are also possible.

[0016] Furthermore, it may be advantageous according to the invention to fix the line running coaxially within the supply line, i.e., the supply length, by bending the supply line in the region of the coaxial supply length such that the supply length can no longer be pulled out of the supply line. The line running within the supply line can additionally or alternatively be fixed by means of further holding means.

[0017] According to the invention, it is advantageous to seal the distributor piece and the supply length section of the connecting line inserted into the supply line by means of a sealing package and / or by means of a material connection on the distributor piece.

[0018] Advantageous embodiments of the invention are each contained in the subclaims, wherein the features contained in the respective subclaims independently of one another each represent an advantageous embodiment of the subject matter of claim 1.

[0019] Furthermore, the present invention relates to a line module according to the subject matter of claim 10 and the subclaims directed thereto.

[0020] The invention is explained in more detail with reference to the accompanying drawings. They show: Fig. 1 a schematic view of a piping system according to the invention, Fig. 2 a longitudinal section through a connector piece according to the invention, Fig. 3 a longitudinal section through a connection connector according to the invention, Fig. 4 a longitudinal section through a shaped bend in the region of the coaxial section of a supply line according to the invention with inserted supply length section and Fig. 5 a schematic view of a modified embodiment of the line system according to Fig. 1.

[0021] In the various figures of the drawing, identical or functionally identical parts are always provided with the same reference symbols.

[0022] With regard to the following description, it is claimed that the invention is not limited to the exemplary embodiments and not to all or several features of described combinations of features, but rather each individual partial feature of the / each exemplary embodiment is also important for the subject matter of the invention, even independently of all other partial features described in connection therewith, and also in combination with any features of another exemplary embodiment.

[0023] In Fig. Figure 1 shows a schematic diagram of a fluid line system according to the invention. This comprises a first dosing unit 1, for example an injection nozzle, and a second dosing unit 2, also for example an injection nozzle. The dosing unit 1 is connected to a pump unit 4 via a supply line 5 via a first connecting line 3. The dosing unit 2 is connected to the supply line 5 via a second connecting line 6. The connecting line 3, the connecting line 6 and the supply line 5 are connected via a connector piece 7. The first connecting line 3, the supply line 5, the second connecting line 6 and the connector piece 7 form a line module. The connector piece 7 has a connecting section 5a for connecting the supply line 5 and a connecting section 6a for connecting the second connecting line 6.Here, the connector piece 7 is designed in such a way that a cavity 9 is formed inside the connector piece 7, see . Fig. 2, which directly fluidically connects the connection sections 5a and 6a, so that a fluid flowing into a fluid channel 8 of the connection line 6 can flow directly from the connection line 6 into the supply line 5 and in the reverse direction. The connector piece 7 has a connection section 3a for the connection line 3. The connector piece 7 is designed such that the connection line 3 can be pushed into the connector piece 7 into its cavity 9 and pushed further through the cavity 9 into the supply line 5, so that the connection line 3 runs within the supply line 5 with a supply length section 3b coaxial with the supply line 5.

[0024] Due to the above design, a fluid can flow through the connecting line 3 and the storage length section 3b into the supply line 5 and in the reverse direction.

[0025] A line system according to the invention for fluid-carrying lines is used in particular in motor vehicles with exhaust gas aftertreatment, a so-called SCR system, in which a urea-water solution is injected into catalysts at several points in the exhaust system.

[0026] The pump unit 4 essentially consists of a supply pump, which generates the necessary system pressure for injecting the fluid through the dosing units 1, 2. This supply pump is also used to empty the dosing units 1, 2, as it can be switched to suction operation. When emptying the dosing units 1, 2, the following conditions or requirements must be met: One or both dosing units 1, 2 must be completely emptied, whereby the resulting air volume or air cushion in the respective connecting line 3, 6 to the emptied dosing unit 1, 2 must be large enough that no fluid can enter the non-operating dosing unit 1, 2 when one of the two dosing units 1, 2 is operating. Furthermore, when a dosing unit 1, 2 is switched on again, no air bubble may enter the respectively operated connecting line 3, 6 due to the emptying of the non-operating connecting line 3, 6. A minimum line length must be maintained for each of the connecting lines 3, 6, which guarantees that after emptying the respective connected dosing unit 1, 2, a sufficiently large air volume is present in each connecting line 3, 6, namely in the emptied connecting line, so that the sucked-in air volume does not enter the common supply line 5.

[0027] This minimum line length depends on the design of the pump unit 4, its control system, and the lumens of the connecting lines 3, 6, and can therefore vary depending on the size of the piping systems. For a simplified design of the pump unit 4 and its control system, for example, a minimum line length of 2 m can be assumed.

[0028] As in Fig. 1, according to the invention, a portion of the required extraction length, which is usually located between the connector piece 7 and the dosing units 1, 2, is routed behind the connector piece 7 with respect to the extraction operation, i.e., into the supply line 5 of the pump unit 4. For example, one of the connecting lines 3, 6 to the dosing modules, the shorter one in each case, can advantageously be inserted via the connector piece 7 into the supply line 5 of the pump unit 4 and can thus be adapted to the required minimum line length.This advantageous arrangement results in that, although the length of the connecting lines 3, 6 to the dosing units 1, 2 is adapted due to local conditions, for example 1 m, the total length of these lines 3, 6 is still 2 m, because part of the connecting line 3, 6 is inserted into the supply line 5 of the pump unit 4 as a coaxial supply length section 3b, for example also of a length of 1 m.

[0029] In Fig. 2 shows an embodiment of a fluid line module according to the invention.

[0030] The connector piece 7 consists, for example, of a T-shaped connector body 10, which can be manufactured as a monolithic plastic part, in particular an injection-molded part. The connector body 10 can also be designed as a Y-shaped body. The connector body 10 has the connection section 5a to which the supply line 5 is connected. The supply line 5 is, for example, inserted into the end of a hollow-cylindrical connection section 5a. In a connection area 5b between the supply line 5 and the connection section 5a, the connection section 5a has, for example, an enlarged inner diameter in adaptation to an outer diameter of the supply line 5. Advantageously, the supply line 5 is integrally connected to the connection area 5b. For this purpose, it is particularly advantageous if a welded connection is provided.In particular, the welded connection can be made by laser welding or ultrasonic welding. In the case of laser welding, the connecting area 5b of the connecting section 5a is made of laser-transparent material.

[0031] The connector body 10 or the connector piece 7, in particular designed as described above, further comprises a connection section 3a for connecting the first connecting line 3. For this purpose, the connection section 3a is designed as a hollow cylinder. The first connecting line 3 is pushed through the connection section 3a and through the inner cavity 9 of the connector body 10 with its end-side supply length section 3b into the connected supply line 5. The supply length section 3b runs coaxially in the supply line 5. Expediently, a circumferential seal is provided within the connection section 3a using a sealing package 13, which fluidically seals the inserted connecting line 3 against the connection section 3a and against the interior space 9. The sealing package 13 can also be used to support the fixation of the first connecting line 3 in the connector body 10 against tensile loading.

[0032] An axial fixation of the connecting line 3 in the area of ​​its supply length section 3b within the supply line 5 can also be advantageously carried out by a shaped bend 14 in the area of ​​the supply length section 3b of the supply line 5 together with the supply length section 3b located therein, see Fig. 4. The shaped bend 14 has an outer bending angle α of, for example, 70°.

[0033] Furthermore, the connector body 10 or the connector piece 7 has the connection section 4a, which has an inner through-opening 15 that opens into the cavity 9. The second connection cable 6 is inserted into this through-opening 15, which in the Fig. 2 is shown in dashed lines. Within the through-opening 15, a sealing arrangement 16a is expediently provided, which fluidically seals the inserted connecting cable 6 circumferentially against the connecting section 4a. Furthermore, a holding unit 16 is expediently inserted into the through-opening 15, which consists, for example, of a holding clamp mounted in a holding cage. With this holding unit 16, the inserted second connecting cable 6 is fixed in the connector body 10 against tensile stress. The holding unit 16 can, for example, be fastened in the connecting section 4a by means of a material bond, in particular by gluing or welding. A snap-in connection can also be expedient.

[0034] It may also be advantageous to establish the connection between the connecting cable 6 and the holding unit 16 or the connector body 10 or the connector piece 7 by means of a cable connector, in particular a quick connector.

[0035] The connector body 10 or the connector piece 7 can be designed to be fully or partially heatable. For this purpose, one or more electrical heating elements, e.g., heating wires, can be arranged, in particular, on the outer circumference of the connector body 10. As shown in Fig. 2, for example, a heating element 17 formed as a wire can be applied to the outside of the connection section 6a, for example, wound spirally. This heating element 17 can be fixed in position and guided by ribs 18 formed on the circumference. Since the connector body 10 is thermally conductive, this heating present only at the connection section 4a can be sufficient for heating the entire connector body 10.

[0036] It may be expedient to ensure mechanical protection of the connector body 10 and also to provide thermal insulation from the outside environment. For this purpose, the connector body 10 can be enclosed by a housing 19.

[0037] According to the invention, it may be expedient for at least one of the connecting lines 3, 6, preferably both connecting lines 3, 6, and / or the supply line 5 to be electrically or fluidically heated. Since the supply line section 3b runs within the supply line 5, the invention offers the advantage that the supply line section 3b does not need to have its own heating element if the supply line 5 is heated.

[0038] It is also expedient if connection connectors 25, which serve to connect the connection lines 3, 6 and the supply line 5 to the dosing units 1, 2 and the pump unit 4, are also electrically heated, although not every one of these aforementioned lines necessarily has to be heated.

[0039] In Fig. Figure 2 shows a possible embodiment of a fluid module according to the invention in which the supply line 5 and the connecting line 3 are each enclosed by a jacket tube 20, 21. It may be expedient to also enclose the second connecting line 6 with a jacket tube. Such jacket tubes 20, 21 serve for mechanical protection and also for thermal insulation. For electrically heating the supply line 5 and / or for electrically heating the connecting lines 3, 6, an electrical heating element 23 running along the respective circumference can be applied, wherein this heating element is advantageously designed as a heating wire that is wound spirally around the respective line. Such a heating element designed as a heating wire is, for example, in Fig. 2 in conjunction with the supply line 5 and the connecting line 3. In the area of ​​the supply length section 3b, the spirally wound heating element 23 also serves as a spacer for the jacket pipe 20. Such heating elements can also be integrated into the connecting lines and / or the supply line. If the connecting lines 3, 6 have jacket pipes 21, the heating wire winding 23 applied to the internal connecting line 3, 6 also performs a spacer function.

[0040] The housing 19 according to the invention can extend into the area of ​​the connection sections 3a, 4a, 5a, and 6a, whereby it can be expedient if the jacket pipes or the jacket pipe 20 and / or 21 are designed as corrugated pipes. It can be expedient here if the housing 19 encompasses the respective jacket pipe 20, 21 in the area of ​​the connection sections, for example in the area of ​​the connection section 3a for the first connection line 3 and the connection section 5a for the supply line 5, and in particular is positively connected to the housing 19.

[0041] It is expedient if an electrical connection 22, for example in the form of a crimp connection, is arranged within the housing 19 for the electrical heating elements 23 to one another and possibly for an existing electrical connecting conductor for connection to an external voltage source.

[0042] The housing 19 can, for example, consist of two housing shells that are detachably secured to one another, for example, by a latching mechanism. However, the housing 19 can also be manufactured as an external encapsulated body. The housing 19 is preferably made of a thermally and, in particular, electrically insulating plastic.

[0043] In addition to the connection types described above between the connector body 10 and the connected lines 3, 5, 6, various combinations are possible, for example the presence of a sealing package and additionally a fixation in the area of ​​the coaxial arrangement of the supply line 5 and the supply length section 3b by the shaped bend 14 as in Fig. 4, or the use of a sealing package in conjunction with a clamping rib or the use of a sealing package with additional use of a clamping or locking connection and tension absorption through a jacket tube 20, 21 between a housing 19 surrounding the connector piece 7 and the connection connector 25 connected to the respective dosing unit 1, 2.

[0044] The connecting lines 3, 6 and the supply line 5 are connected to the corresponding dosing unit 1, 2 or the pump unit 4 by means of the connection connector 25, see Fig. 3. This connection connector 25 comprises a connector body 26, which is designed as a monolithic plastic injection-molded part. The connector body 26 has an internal through-channel 27. The connector body 26 has a connection section 26a for connecting the respective connecting line 3, 6 or the supply line 5 to be connected by plugging it in. For this purpose, the connection section 26a is hollow-cylindrical. Preferably, the respective line 3, 6, or 5 is firmly secured, for example by laser welding, in the connection section 26a and also sealed. Opposite the connection section 26a is a connection section 26b for connecting to the associated dosing unit 1, 2 or the pump unit 4. This connection section 26b is preferably designed as a sleeve part, into which a plug of the unit to be connected can be inserted and locked in the inserted position and released from this position.The connector body 26 can be heated. For this purpose, it may be expedient to arrange a heating element on its outer circumference, particularly in the form of a spiral heating wire winding. The connector body 26 is preferably enclosed by an outer housing 28, in which the jacket tube 20, 21 of the respective line 3, 6, or 5 terminates. The jacket tube 20, 21 is positively secured in the housing 28.

[0045] The holding force for the connecting line 3 is composed, for example, of three components: the pressing force of the sealing package, the holding force of the shaped bend 14 and the axial holding forces of the jacket pipe 21 arranged between the housing 19 and the housing 28 of the connection connector 25 on the dosing module side of the connecting line 3. This jacket pipe 21 is preferably designed as a corrugated pipe and is received in the housings 19, 28 in such a form-fitting and / or force-fitting manner that a total holding force of, for example, 200 Nm can be absorbed.

[0046] In Fig. 5 shows a further embodiment of a line system according to the invention. Here, functionally identical parts as in Fig. 1 are marked with the same reference numerals, so that the description of Fig. 1 and Fig.2. In this embodiment, the supply length section 3b, which runs behind the connector piece 7 as a section of the connecting line 3, has a length that corresponds to the system-specific minimum line length. This results in the dosing unit 2 being directly connected to the connector piece 7 at its connection section 6a, so that this dosing unit 2 is fluidically connected to the supply line 5 exclusively via the connector piece 7, without the interposition of a connecting line.

[0047] For example, the connecting lines 3, 6 have an outer diameter of 3.4 mm and a wall thickness of 0.8 mm. The supply line 5, for example, has an outer diameter of 6 mm and a wall thickness of 0.8 mm. The interior space 9, for example, has an inner diameter of 4.4 mm.

[0048] The invention is not limited to the illustrated and described embodiments, but also encompasses all equivalent embodiments within the meaning of the invention. It is expressly emphasized that the embodiments are not limited to all features in combination; rather, each individual partial feature can also have an inventive significance in itself, independently of all other partial features. Furthermore, the invention is not yet limited to the combination of features defined in claim 1, but can also be defined by any other combination of specific features of all individual features disclosed as a whole. This means that, in principle, practically every individual feature of claim 1 can be omitted or replaced by at least one individual feature disclosed elsewhere in the application. List of reference symbols 1 dosing unit 2 dosing units 3 First connecting cable 3a Connection section 3b Supply length section 4 Pump unit 4a Connection section 5 Supply line 5a Connection section 5b Connection area 6 Second connecting cable 6a Connection section 7 Connector piece 8 Fluid channel 9 Cavity 10 connector bodies 13 Sealing package 14 Form bending 15 passage opening 16a Sealing arrangement 16 Holding unit 17 Heating element 18 ribs 19 housings 20 jacket pipe 21 jacket pipe 22 Electrical connection 23 Heating element 25 connection connectors 26 connector bodies 26a connection section 26b connecting section 27 Inner passage channel 28 housings

Claims

[1] Line system for a fluid-carrying line (3, 5, 6) consisting of two dosing units (1, 2) for dosing fluid and a supply pump unit (4), which are connected to one another via a fluid line module, wherein the fluid line module consists of a first and a second connecting line (3, 6) and of a connector piece (7) which connects the connecting lines (3, 6) to one another, as well as of a supply line (5) which is connected to the connector piece (7), wherein the supply line (5) is connected to the supply pump unit (4) and the connecting lines (3, 6) are connected to the dosing units (1, 2), characterized bythat one of the connecting lines (3, 6) is introduced through the connector piece (7) into the supply line (5) with a supply length section (3b) protruding from the connector piece (7), wherein the length of the first connecting line (3) running through the connector piece (7), including the length of the supply length section (3b), corresponds to at least one minimum line length characteristic of the line system for a connecting line (3) of a dosing unit (1, 2), and the line length of the other, second connecting line (6) up to the connector piece (7) corresponds to at least the minimum line length less the length of the supply length section (3b). [2] Conduit system according to claim 1, characterized by that the supply length section (3b) which runs behind the connector piece (7) in the supply line (5) has a length which corresponds to the minimum line length. [3] Conduit system according to claim 1 or 2, characterized bythat the supply length section (3b) is arranged coaxially in the supply line (5). [4] Conduit system according to one of claims 1 to 3, characterized by that the connector piece (7) has a cavity (9) surrounding the connecting line (3) running through the connector piece (7), which cavity is fluidically sealed with respect to the circumference of the connecting line (3) running through it. [5] Conduit system according to one of claims 1 to 4, characterized by that the supply line (5) is inserted and held in the connector piece (7) in a materially bonded manner, in particular by welding or gluing, in a fluid-tight manner or by means of a sealing package. [6] Conduit system according to one of claims 1 to 5, characterized by that the fluid line (6) ending at the connector piece (7) is inserted in a fluid-tight manner into a connection section (6a) of the connector piece (7). [7] Conduit system according to one of claims 1 to 6, characterized bythat the supply line (5) and / or one or both of the connecting lines (3, 6) can be heated electrically or fluidically. [8] Conduit system according to one of claims 1 to 7, characterized by that the connector piece (7) is electrically heatable. [9] Conduit system according to one of claims 1 to 8, characterized by that connecting connectors (25) connected to the connecting lines (3, 6) and the supply line (5) are provided for connection to the dosing units (1, 2) and to the pump unit (4), which are unheated or heated. [10] Conduit system according to one of claims 1 to 9, characterized by that the supply line (5) and / or at least one of the connecting lines (3, 6) is / are enclosed by a jacket pipe (20, 21). [11] Conduit system according to one of claims 1 to 10, characterized bythat the connector piece (7) is enclosed by an outer housing (19), and in particular the housing (19) is positively connected to the jacket pipes (20, 21) of the connecting line (3) and the supply line (5) in the region of the connecting sections (3a, 5a). [12] Conduit system according to claim 11, characterized by that there is a positive connection between the housing (19) of the connector piece (7) and the casing tube (20) of the supply line (5) and between the housing (19) of the connector piece (7) and the casing tube (21) of the connecting line (3), which is pushed into the supply line (5), and in particular between the casing tube (21) and an outer housing (28) of the connecting connector (25) for connection to a dosing unit (1, 2). [13] Fluid line module according to the preamble of claim 1, characterized by the features of the characterising part of claim 1. [14] Fluid line module according to claim 13, characterized by the features of one or more of subclaims 2 to 11.

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