Abstract:
The invention relates to a device ( 1 ) for connecting two fluid-channeling lines ( 10, 20 ), wherein the device has a through-bore ( 2 ) for advancing the fluid and two opposite line mounts ( 11, 21 ), which terminate at a predetermined distance ( 4 ) from one another within the device. Each of these line mounts ( 11, 21 ) is designed such that it is provided with a first part ( 12, 22 ), through which the through-bore ( 2 ) leads, and a second part ( 13, 23 ), which enclosed the first part ( 12, 22 ), an annular space ( 14, 24 ) therefore being formed between the first part ( 12, 22 ) and the second part ( 13, 23 ). Each of the two fluid-channeling lines, ( 10, 20 ) is arranged in one of the line mounts ( 11, 21 ) such that it has an inner cross section ( 16, 26 ) arranged, and fixed, with sealing action against the first part ( 12, 22 ) of the device and has an outer cross section ( 17, 27 ) arranged, and fixed, in the annular space ( 14, 24 ).

Description:
FIELD OF THE INVENTION 
       [0001]    The invention relates to a device for connecting two fluid-conducting lines to one another according to the preamble of claim  1 . 
       BACKGROUND OF THE INVENTION 
       [0002]    German utility model DE 1 732 279 U1 discloses a connection between two fluid-conducting lines, to be more precise a connecting element for connecting two housing hoses. The connecting element is embodied as a single-piece component through which a continuous drilled hole leads and which is provided at its outer side with a thread which is embodied in opposite directions, with the result that two garden hoses can easily be connected to one another by screwing onto the thread, and disconnected again from one another. 
         [0003]    In addition, European Patent EP 2 035 737 B1 discloses a sleeve for connecting two pipes which are each embodied with a connecting collar. The sleeve can be fitted here over the connecting collars of the pipes to be connected and can be fastened against unintentional removal by a locking device against unintentional removal, but can be removed again relatively easily. 
         [0004]    In the utility vehicle and automobile industry, fluid-conducting lines are used to transport, for example, urea-water mixtures for environmentally friendly exhaust gas purification. Since the lines which conduct these urea-water mixtures have to be heated, the electric contacts are typically arranged in the region of a hose coupling (connector). Furthermore, in the utility vehicle and automobile industry it is necessary to operate in a cost-effective way with a design which is as compact as possible so that lines for urea-water mixtures should be capable of being manufactured as conveniently as possible. These lines must meet all the applicable regulations relating to media-resistance, leak proofness or temperature-resistance. 
       SUMMARY OF THE INVENTION 
       [0005]    The object of the invention is to make available an improved device for connecting two fluid-conducting lines, specifically for application in the field of the utility vehicle and automobile industry, and particularly preferably for lines which conduct urea-water mixtures. This object is achieved by means of the features of claim  1 . A housing which can be used, in particular for a device according to the invention is specified in claim  15 . Advantageous refinements of the invention are specified in the dependent claims. 
         [0006]    The inventive solution provides that a device for connecting two fluid-conducting lines has a continuous drilled hole for passing on the fluid, wherein the device has two line receptacles which lie opposite one another and which end at a specific distance from one another within the device. Each of the line receptacles lying opposite one another is embodied in such a way that it is provided with a first part through which the continuous drilled hole leads, and a second part which surrounds the first part, with the result that an annular space whose floor defines the end of the respective line receptacle is formed between the first part and the second part. The first of the fluid-conducting lines is arranged in one of the line receptacles in such a way that it is arranged with an inner cross section in a seal-forming fashion against the first part of the device and with an outer cross section in the annular space and is secured there. The second of the fluid-conducting lines is arranged in the other of the line receptacles in such a way that it is arranged with an inner cross section in a seal-forming fashion against the first part of the device and with an outer cross section in the annular space and is secured there. 
         [0007]    As a result of this device, a compact reliable and cost-effective connection of two lines which conduct fluid, preferably a urea-water mixture. Furthermore, an additional detachable intermediate connection such as, for example, a sleeve is required as a result of which a certain degree of unreliability arises in terms of the leakproofness. 
         [0008]    The device is preferably embodied in such a way that each of the fluid-conducting lines is secured by means of an adhesive which at least partially fills in the annular space. 
         [0009]    Preferably in this context at least one spacer element is formed on the floor of at the bottom of each of the spacers of each of the annular spacers, which spacer element forms a stop, spaced apart from the bottom for the end of each of the lines. This arrangement ensures sealed enclosure and therefore, owing to the large adhesive surfaces which are made available at the end sides and the lateral side particular reliable securement of the lines with respect to the drilled hole which passes through, and a compact design is also made possible. As an alternative to a connection by means of adhesion, the device is preferably embodied in such a way that each of the fluid-conducting lines is secured in the annular space by means of friction welding, ultrasonic welding or laser welding. The advantage of a welding method for securing the lines is that such a method permits rapid and cost-effective manufacture of the device. The satisfactory positioning of the line ends before the welding is ensured by their arrangement in the annular spaces. 
         [0010]    According to a further alternative, the device is preferably embodied in such a way that each of the fluid-conducting lines is connected to the second part by means of a crimped connection. The advantage of the crimping method is that a cost-effective mechanical connection can be produced relatively quickly between the lines and the device. For the provision of a crimped connection, the length of the outer second part of the line receptacles with respect to the inner first part thereof is correspondingly reduced. 
         [0011]    The device is preferably embodied in such a way that the line is formed by a hose. A hose has the advantage over a line that it has a certain degree of flexibility and therefore simpler and more flexible laying is possible. 
         [0012]    The fluid in each of the lines is preferably formed by a urea-water mixture, as a result of which the device can be used in the utility vehicle and automobile industry. 
         [0013]    The device is preferably embodied in such a way that the fluid-conducting lines can be heated. This has the advantage that the lines can be used for fluids with which the undershooting of a predetermined temperature is not desired, and therefore heating of the lines is necessary. 
         [0014]    The device is preferably embodied in such a way that at least two heating circuits are made available. The actuation or the power control of each of the heating circuits is carried out by means of at least one temperature sensor. In one advantageous embodiment, the heating circuit, for example in the form of heating wires, heating foils or heating mats, are arranged on or in each fluid-conducting line, secured there and electrical contact is made with them outside the device or there connected to one another. In addition, a jacket is made available around the contacts or the connecting points of the heating circuits. The advantage of making available at least two heating circuits is that by activating these heating circuits differently it is possible to make available a separate power control means and therefore an individual heating temperature in the individual lines or line sections, with the result that the device can be used in different application ranges. 
         [0015]    For this purpose, the first of the fluid-conducting lines can advantageously be used in a relatively high temperature range T 1  of, for example, −40° C.&lt;T 1 ≦200° C. and the second of the fluid-conducting lines can be used in a relatively low temperature range T 2  of, for example, −40° C.&lt;T 2 ≦120° C. These temperature ranges are, for example, typical of application in an automobile or utility vehicle if, for example, one line is used in an area near to an engine and the other line is used in an area which is not to an engine. 
         [0016]    Each of the fluid-conducting lines is advantageously manufactured from a different material in order to meet the temperature conditions and permit more cost-effective manufacture. 
         [0017]    The device according to the invention is particularly preferably located in a housing and is preferably a closable cover which is formed thereon or arranged thereon, and has in its longitudinal direction two openings which lie opposite one another and through which in each case one of the fluid-conducting lines is guided. 
         [0018]    In addition, on the openings of the housing a connecting element is preferably made available which is configured to connect a guide device for each of the fluid-conducting lines to the housing. This housing ensures that the device is sealed off in a closed fashion against environmental influences which is important in particular in the utility vehicle and automobile industry, since demanding requirements are made of the individual components (specifications, standards etc.). 
         [0019]    In one preferred embodiment, the housing has a recess for receiving a control circuit board. As a result of the integration of a control circuit board, an even more compact design for an individual heating power controller of the connected lines or line sections is made possible. Fewer individual elements are required for the manufacture, which provides a further cost saving. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0020]    An exemplary embodiment of a device according to the invention for connecting two-fluid-conducting lines is explained in more detail below with reference to the drawings. Identical reference symbols in the various figures denote the same elements here. In the drawings: 
           [0021]      FIG. 1  shows a schematic view of an embodiment of the device according to the invention; 
           [0022]      FIG. 2  shows a schematic view of a further embodiment of the device according to the invention, 
           [0023]      FIG. 3  shows a schematic view of a housing according to the invention with the device according to the invention arranged therein, and 
           [0024]      FIG. 4  shows a schematic view of a housing according to the invention with a recess for a control circuit board. 
       
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT 
       [0025]      FIG. 1  is a schematic illustration of a first exemplary embodiment of a device  1  according to the invention. The device  1  is penetrated in the direction of its longitudinal axis by a continuous drilled hole  2 , with the device  1  has an opening at it respective ends in the direction of the longitudinal axis  3 . However, in contrast to the illustration in the figures, an angled device, in which the longitudinal axis within the device is bent or curved, and as a result experiences a change in angle of, for example, 90° C. is also possible. 
         [0026]    A line receptacle ( 21 ) is provided at each of the ends of the device, each of which line receptacles  11 ,  21  can receive a fluid-conducting line  10 ,  20 . The one line receptacle  11  ends within the device  1  at a predetermined distance  4  from the other line receptacle  21 , with the result that, apart from the continuous drilled hole  2 , there is no fluid connection between the line receptacles  11  and  21 . 
         [0027]    The line receptacles  11 ,  21  are embodied in such a way that they each have a first part  12 ,  22 , through which the continuous bore  2  leads, and a second part  13 ,  23 , which surrounds the first part  12 ,  22 , with the result that in each case an angular space  14 ,  24  is formed between the first part  12 ,  22  and the second part  13 ,  23 . The bottom  15 ,  25  of the respective line receptacle  11 ,  21  defines the end of the corresponding line receptacle  11 ,  21 . The two fluid-conducting lines  10 ,  20  are each formed in  FIG. 1  by whose inner passage is bounded by a wall with an inner cross section  16 ,  26  and an outer cross section  17 ,  27 . 
         [0028]    The respective hose  10 ,  20  is arranged here in the line receptacle  11 ,  21  in such a way that its inner cross section  16 ,  26  is arranged in a seal-forming fashion against the first end  12 ,  22  and its outer cross section  17 ,  27  is arranged in the annular space  14 ,  24  and is secured therein. The continuous bore  2  therefore leads from one end of the device  1  to the other end of the device  1  (in the direction of its longitudinal axis  3 ) and therefore connects two lines or hoses  10 ,  20  to one another without in the process adversely affecting the through flow fluid. The two lines  10 ,  20  are arranged here in the device  1  in such a way that they form a sealed connection therewith. 
         [0029]    In order to permit a particularly strong connection, the outer cross section  17 ,  27  of each hose  10 ,  20  is secured in the respective annular space  14 ,  24  by means of an adhesive  100  which at least partially fills in the annular space  14 ,  24 . For this purpose, a material of the lines  10 ,  20  must be selected which is suitable for the adhesion and the corresponding adhesive  100 , and the adhesive  100  must be selected in accordance with the material used for the lines  10 ,  20 . When adhesive  100  is used for securing, the respective annular space  14 ,  24  has, towards its bottom  15 ,  25  a spacer element  18 ,  28 , preferably in the form of an annular slope which widens toward the bottom  15 ,  25 . The respective line or the hose  10 ,  20  is pushed in the form of a tight fit over the corresponding part  12 ,  22  in each case, and then abuts with its end  19 ,  29  in each case against the corresponding spacer element  18 ,  28 , with the result that a distance is produced between the end of the hose  19 ,  29  and the bottom  15 ,  25  of the annular space  14 ,  24  as a result of which the adhesive  100  also secures the respective line  10 ,  20  at the end side from the side of the bottom  15 ,  25 . 
         [0030]    The device  1  which is illustrated in  FIG. 2  corresponds essentially to the device  1  which is illustrated in  FIG. 1  (with the same reference symbols). The only structural difference is that there is no spacer element as in  FIG. 1 . This is because in methods such as friction welding, laser welding or ultrasonic welding or also in the case of a crimping method the line  10 ,  20  should abut as far as possible against the bottom  15 ,  25  of the line receptacle  11 ,  25  and should have an annular space  14 ,  24  which is as small as possible so that these methods can be used effectively. In the case of friction welding, the heat is generated by a relative rotational movement of the device  1  and the lines  10  and  20 , even essentially at the end sides, as frictional heat between the bottom  15 ,  25  of the annular space  14 ,  24  and the end  19 ,  29  of the lines  10  and  20 . 
         [0031]    If methods such as friction welding, laser welding or ultrasonic welding are used to secure the lines  10 ,  20 , the materials of the lines  10 ,  20  must be composed, like the material of the first part  12 ,  22  and of the second part  13 ,  23 , from material which is suitable for the respective method. 
         [0032]    In the case of friction welding, two parts which are in contact with one another at contact faces are moved relative to one another. As a result of the friction which occurs, the two parts heat up and are plastified, that is to say change from a solid state into a deformable or fluid state. In order to provide a fixed connection between the parts, they must be placed in the desired position at the end′ of the friction welding process and a pressure must be applied thereto. Suitable materials are, for example thermoplasts. Ultrasonic welding forms part of the field of friction welding and is a method in which thermoplasts are connected, wherein the required heat is provided by high frequency mechanical oscillation (ultrasound). In order to apply the friction welding method (including ultrasonic welding) for the device  1  according to the invention, the materials of the respective line,  10   20  and of the respective first part  12 ,  22  are selected in such a way that they can be placed, by rotating relative to one another and/or by ultrasound, in a state which permits them to be connected to one another. 
         [0033]    The laser welding method is used in particular for welding components which have to be welded together quickly and with which a small and narrow welding seam is required. In the case of laser welding, the laser beam is focused by means of optics. The absorption of the laser power on the surface of the material to be welded results in a very rapid rise in the temperature, so that a melt forms. In order to apply the laser welding method for the device  1  according to the invention, the respective second part  13 ,  23  must be composed of a material which is permeable to laser beams to such an extent that the respective line  10 ,  20  can as a result be secured to the respective first part  12 ,  22 . 
         [0034]    Crimping is a method in which two parts are connected to one another by mechanical or plastic deformation, wherein an homogeneous connection which is difficult to disconnect and which is electrically and mechanically very reliable is produced. In order to apply this method for the device  1  according to the invention, suitable materials must be correspondingly used in each case for the respective line  10 ,  20  and the first and second parts  12 ,  13 ,  22 ,  23 . 
         [0035]    The exemplary embodiments described above have in common the fact that the lines  10 ,  20  can be heated. This can be done, for example, by means of a heating circuit  5  with heating wires which are wound around the respective line  10 ,  20  and secured thereto. In order to bring about selective control of the heating power, two or more heating circuits can be made available whose power is controlled, for example, by means of a control circuit board by evaluating specific parameters which are matched to the place and purpose of use and/or by evaluating at least one temperature signal of a temperature sensor. Each of the heating circuits  5  is secured on or in one of the two lines  10 ,  20  and be controlled separately. Use in various application ranges is therefore possible, for example in a first relatively high temperature range T 1 , in which the temperature is, for example, between 120° C. and 200° C., and in a second relatively low temperature range T 2 , in which the temperature is, for example in a range from 30° C. to 120° C. Such temperature ranges are customary, for example, given a line leading from an outer area into an inner area or from an area of a utility vehicle or an automobile which is near to the engine into a region of a utility vehicle or an automobile which remote from the engine. In this context, the lines which are suitable for the relatively high temperature range T 1  are a rule significantly more expensive, for which reason the use of the device according to the invention has financial benefits in the form of a cost reduction in such relatively high quality lines are used only where they are also necessary owing to the requirements, while in the other areas more cost-effective lines are used. 
         [0036]    In the device  1  according to the invention, the heating circuits  5  are connected to one another on the outside of the device  1 . For this purpose they are led outward from the lines  10 ,  20  in the region of the connecting points are connected to one another by means of suitable contacts  7  or are connected to the contacts  260  of a control device, for example in the form of a control circuit board  25  (illustrated in  FIG. 4 ). This connecting point to the contacts  7  is advantageously provided with a jacket  6  which protects the connecting point against environmental influences, with the result that a reliable electrical connection is ensured. 
         [0037]    The device  1  according to the invention is advantageously arranged, as illustrated in  FIGS. 3 and 4  in a housing  200  which is formed in a closable fashion from a base body  210  and a cover  220  which is formed thereon in one piece (for example with a film hinge) or arranged thereon. The cover  220  can also be attached in a foldable fashion to the base body  210  and connected thereto or attached thereto by means of a latching-in mechanism, as shown in  FIG. 3 , for example. Other embodiments of the housing  200  are also possible as long as the housing  200  can be opened so that the device  1  can be reached in order to install it there, for example. 
         [0038]    The housing  200  has, at its ends in the direction of its longitudinal axis, two openings through which the respective lines  10 ,  20  can be led. For this purpose, for example connecting elements  230  can be made available which a connection between a guide device  300 , in which the lines  10 ,  20  are guided and protected against environmental influences, and the housing  200 . The guide device  300  can be embodied, for example, in the form of a bushing which surrounds the hose ends in a sealed fashion and which engages with an outwardly protruding flange into a corresponding annular groove of the housing  200 . The annular grooves form the connecting elements  230  in this case. The material of the housing should satisfy the specifications of the automobile industry with respect to leak proofness, media-resistance and heat-resistance etc. 
         [0039]    The housing  200  advantageously has a recess  240 , for example on its cover  220 , as illustrated schematically in  FIG. 4  in order to receive therein a control circuit board  250  for controlling the heating circuits  5  or other functionalities. The control circuit board  250  is provided with a plurality of contacts  260  for connecting to the heating circuits  5 . 
         [0040]    By means of the device  1  according to the invention for connecting two fluid-conducting lines to one another and the housing  200  according to the invention it is possible to connect two different lines  10 ,  20  to one another in a sealed and compact fashion by means of a single component. In addition, the inventive arrangement of the heating circuits  5  permits the temperature of the respective lines  10 ,  20  to be controlled separately in a simple way. 
       LIST OF REFERENCE SYMBOLS 
       [0000]    
       
           1  Device 
           2  (Continuous) drilled hole 
           3  Longitudinal axis 
           4  Distance (between the line receptacles) 
           5  Heating circuit 
           6  Jacket 
           7  Contact (for heating circuit) 
           10 ,  20  Line or hose 
           11 ,  21  Line receptacle 
           12 ,  22  First part of (of  11 ,  21 ) 
           13 ,  23  Second part (of  11 ,  21 ) 
           14 ,  24  Annular space 
           15 ,  25  Bottom of the annular space 
           16 ,  26  Inner cross section (of  10  and  20 ) 
           17 ,  27  Outer cross section (of  10  and  20 ) 
           18 ,  28  Spacer element 
           19 ,  29  End (of  10  and  20 ) 
           100  Adhesive 
           200  Housing 
           210  Base body 
           220  Cover 
           230  Connecting element 
           240  Recess 
           250  Control circuit board 
           260  Contact (on  250 ) 
           300  Guide device 
         T 1  (Relatively high) temperature range 
         T 2  (Relatively low) temperature range.