• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Heating device (2), in particular for heating a liquid reducing agent used for the after-treatment of the exhaust gas comprising a heating body (5) which has a clearance zone (10) for receiving a heating element (14), a fastener (16) for locking the heating element (14) in the clearance zone (10).
    公开号:FR3021996A1
    申请号:FR1555088
    申请日:2015-06-04
    公开日:2015-12-11
    发明作者:Juergen Hanneke
    申请人:Robert Bosch GmbH；
    IPC主号:
    专利说明:

    [0001] FIELD OF THE INVENTION The present invention relates to a device for heating a liquid, in particular a reducing agent, for reducing the exhaust gases emitted by an internal combustion engine of a motor vehicle. State of the art In order to eliminate nitrogen oxides from the exhaust gases of internal combustion engines, in particular diesel engines, the SCR technique, that is to say the selective catalytic reduction with a fo reducing agent containing urea is a technique that has come to the fore. For this purpose, systems have been developed to comply with the exhaust gas regulatory limits by the definite addition of an aqueous solution of urea (for example the solution known under the brand name "Adblue®" introduced into the pipeline of These systems essentially comprise a tank receiving the aqueous solution of urea, a transfer module with a pump unit and a filter, and a metering module installed on the gas line. As the aqueous solution of urea freezes at a relatively high temperature, it can not be lowered in any way by the addition of antifreeze, without reducing the characteristics of the product. In the case of a reducing agent, the reducing agent reserve must be heated when the external temperatures are low in order to prevent the reducing agent from freezing. auffage that usually work with electrical energy. In order to protect the heating element itself, which consists for example of one or more PTC resistive elements (resistive element having a positive temperature coefficient) against the action of the reducing agent, these heating elements are generally coated. of a plastic material. However, during the coating or overmolding by injection, the forces generated as well as the mechanical processes used hitherto to compress the heating elements on as large an area as possible against the heating body itself (thermal distributor) and heat transfer as good as possible between the heating element and the heating element may damage the heating elements (eg the ceramic body may break) so that the electrical resistance increases with the time of use and as the alternating temperature in operation so that the element is reported as defective. DE 10 2012 213 417 discloses a heating installation having a thermo-conductive body with surface compensation elements.
    [0002] OBJECT OF THE INVENTION The object of the present invention is to allow a good thermal transmission between the heating element and the heating body without exposing the heating element to the risk of damage because of the excessive stresses to which it is subjected.
    [0003] DESCRIPTION AND ADVANTAGES OF THE INVENTION For this purpose, the subject of the invention is a heating device, in particular for heating a liquid reducing agent for the aftertreatment of the exhaust gases, comprising at least one heating body which has at least one zone clearance for receiving at least one heating element, installed in this clearance zone and blocked by at least one fixing element. The fixing element comprises in particular an elastic partial zone. The invention also relates to a method for mounting a heating element on a heating element, in particular for heating a liquid reducing agent for the aftertreatment of the exhaust gases and which comprises at least one zone of release for receiving the heating element, said method being characterized by placing the heating element on the electrical rail, attaching the heating element to the electric rail with an elastic fastening element and introducing the heating element and having at least one zone of the electric rail in the zone of clearance made in the heating body. The invention provides a regular contact surface between the heating body, the electrical rail, the heating element and the fixing element and thereby develops a precisely defined application force resulting from the geometry of the fastening element. and the heating body. The flexibility of the fastening element results in a regular contact surface and thus a regular thermal transfer to the heating body and the insulating coating. At the same time, the heating element is protected by the fastener element preventing excessive thrust during the injection of the coating. The heating element can be mounted easily, in particular without the need for any other driving machine such as presses; when mounting on the contact surface of the heating element there will be no frictional wear because the relative movement is only possible between the back of the fixing element and the heating body. The mounting direction is freely selectable and the heat transfer between the heating element, the heating element and the insulating coating and thus the heat transfer from the heating element to the fluid in which the heating device is immersed is optimized. thanks to minimized air gaps, maximum contact surfaces and appropriate choice of materials. The invention can thus be applied without the outer insulating coating. According to a development, there is provided at least one elastic rail which passes into a clearance zone made in the heating body. The heating element thus installs on the electrical rail so that the heating element will be supplied with power by the electrical rail and the securing element will be securely locked on the electrical rail to ensure the reliability of the heating element. the thermal and electrical conduction between the heating element and the electric rail. According to a development, the fastening element has at least one opening allowing the heating element and / or at least one zone of the electrical rail to pass through the fixing element and thus simplifying the assembly and guaranteeing the connection between the fixing element, the heating element and the electric rail. According to a development, the fastening element has a central zone and at least two branches which start from the central zone at an angle, in particular at a substantially straight angle. The branches are elastically movable with respect to the central zone, which makes it possible to move them from their rest position for assembly and then to press them with a definite thrust against the heating element, the electric rail and / or the heating body.
    [0004] In particular, a branch is applied against the heating element when the fixing element blocks the heating element to achieve a good thermal and electrical conductor connection between the heating element and the fixing element. To further improve the transfer of heat between the branch and the heating element, a thermo-conductive element is interposed between the branch and the heating element, this thermally conductive element being made of a particularly good heat conducting material. According to a development, at least one of the branches has several parallel strips, which increases its flexibility or flexibility and improves the connection between the branch and the heating element. The heating body, the electric rail, the heating element and the fixing element are embedded by injection of a material to produce a totally sealed heating device which protects well against external influences, in particular vis-à-vis screw of the liquid reducing agent, in particular the electric rail and the heating element. Drawings The present invention will be described below, in more detail with the aid of an example of a heating device of a liquid reducing agent for the aftertreatment of the exhaust gas and its manufacturing process shown in FIG. the accompanying drawings, in which: FIG. 1 is a perspective view of an open liquid reservoir equipped with a heating device, FIG. 2a is a perspective view of the heating device, FIG. 2b is a perspective view. of the heating body of the heating device without the outer coating, FIG. 2c shows the electric rail of the heating device, FIG. 3 is a simplified top view of the heating device according to the state of the art, the FIG. 4 is a schematic view of an exemplary embodiment of a heating device according to the invention, FIG. 5a is a section along the sectional plane AA of FIG. 4, FIG. 5b is a section along the plane of FIG. FIG. 6 is a perspective view of the zone of the fastener element shown on the right in FIG. 5a; FIG. 7 shows an alternative embodiment of a fastener element according to FIG. FIG. 8 shows another embodiment of the fastening element according to the invention. DESCRIPTION OF EMBODIMENTS OF THE INVENTION FIG. 1 is a view of an open liquid reservoir 1 showing the housing 3, a pump device and a heating device 2. Other details of the liquid reservoir 1 , known according to the state of the art, do not come within the scope of the invention and will not be described in detail. FIG. 2a is a perspective view of a heating device 2. The heating device 2 comprises a heating body 5 coated by injection and having a central zone 4 from which several fingers 6 leave in a comb arrangement. extending outwards. In the exemplary embodiment there are six fingers. Figure 2b shows the heating body 5 of the heater 2 without its coating. The vertical surfaces of the central zone 4 between the fingers 6 comprise, on the side facing the observer, two heating elements 14 which are in particular PTC elements. An electrical rail 8 for supplying the heating elements 14 overcomes the heating elements 14.
    [0005] FIG. 2c shows the electric rail 8 without the heating body 5 and the heating elements 14. The electric rail 8 has a connecting zone 7, bent, extending in a substantially horizontal direction and having a first branch 8a and a second branch 8b which extends substantially to the square relative to the first branch 8a. Two contact areas 9 in the form of platelets start from the second branch 8b; these contact areas serve to contact the heating elements 14 in a substantially vertical direction; the contact zones 9 are each substantially the same surface as one of the heating elements 14. The left-hand end of the electrical rail 8 is provided with a first pole 11 to be connected to a source of power not shown. In front of the first pole 11, there is a second pole 12 for the electrical connection with the ground. Figure 3 shows a simplified schematic top view of the heating device 2 known according to the state of the art.
    [0006] The heating device 2 has a central zone 4 from which several fingers 6 in the form of a comb, pointing outwards. In the case of the example of Figure 3 there are six fingers. The first comb 6 shown at the top left comprises electrical connections in the form of a first pole 11 and a second pole 12. The first pole 11 is electrically connected to the electrical rail 8 which starts from the first pole 11 next an L shape with a first leg 8a along the first finger 6 and a second leg 8b substantially at right angles to the first leg 8b, along the central zone 4.
    [0007] The central zone 4 has cavities 10 in the form of pockets between the fingers 6 to receive the heating elements 14 not detailed in FIG. 3. After placing the heating elements 14 in the cavities 10, they are deformed plastically as indicated. by dashed lines to block the heating elements 14 in the cavities 10. In the next step, the heating body 5 is injected with an injected layer 30 to enclose in a fluid-tight manner, in particular the electrical rail 8 and the heating elements 14 and protect them against external influences, in particular those of the liquid reducing agent. When the pockets 10 are deformed and also during over-injection molding, significant forces are exerted on the heating elements 14 which can damage them.
    [0008] FIG. 4 shows a heating device 2 according to an exemplary embodiment of the invention in a schematic representation. According to the invention, clearance zones 10 are provided in the heating element 5 so that, in addition to the heating elements 14, fixing elements 16 can be installed in the clearance zones 10 and the heating elements 14 can be locked in position. 5a is a section along the plane AA of FIG. 4. The connecting zone 7 of the electrical rail 8 according to the representation of FIG. 5a is perpendicular to the plane of the drawing and has a contact zone 9 which descends in the representation of FIG. 5a, from the connection zone 7.
    [0009] According to Figure 5a, the right side of the contact zone 9 of the electrical rail 8 has a heating element 14 which is in particular a heating element PTC. This element is installed to have electrical contact between the side of the heating element 14 facing the contact zone 9 and the contact zone 9 of the electrical rail 8.
    [0010] On the left side, according to FIG. 5a, of the contact zone 9, there is an attachment zone 24 for the heating body 5 which has an inclined surface on its (left) side not facing the contact 9. A fastening element 16 according to the invention surrounds the fastening zone 24, the contact zone 9 of the electrical rail 8 and the heating element 14 so that this heating element 14 is blocked with a defined pressure, given by the construction of the fastening element 16, against the contact zone 9 of the electrical rail 8 and thus the heating element 14 is locked against the contact zone ensuring the reliability of the electrical contact between the heating element 14 and the zone contact 9 of the electrical rail 8. For this, the fastening element 16 has a central zone 18 which, in the representation of Figure 5a is substantially horizontal from left to right in the fastening zone 24. The central zone 18 of the fixatio element 16 has an opening 32 for passing the contact zone 9 of the electrical rail 8 through the central zone 18. The fastening element 16 has two branches 20, 22 extending from the central zone 18. The first branch FIG. 5a is shown parallel to the inclined side 25 of the fastening zone 24 and the second branch 22 shown on the right in FIG. 5a has an upper zone 21, curved, which joins the central zone 18 of the FIG. fastening element 16 and a lower zone 23 parallel to the heating element 14 to reach the contact zone 9 of the electrical rail 8. The cooperation of the two branches 20, 22 with the fixing zone 24 and the heating element 14 applies the heating element 14 with a thrust predefined by the construction of the fastening element 16 against the contact zone 9 of the electrical rail 8 and thus locks against it safely. The end of the first branch 20 shown at bottom in FIG. 5a, opposite the central zone 18, has a hook-shaped zone 19 which passes under the lower end of the fastening zone 24 to lock the fastening element 16 against the fastening zone 24, and in particular preventing the fastening element 16 from slipping off the fastening zone 24. Next to the hook-shaped zone 19, the fixing zone 24 has a part protector protector 26 avoiding during the injection, injected material arrives between the fastening element 16 and the attachment zone 24, the contact zone 9 of the electrical rail 8 and the heating element 14 and risk of Expelling the fastening element 16 and detaching it from the fastening zone 24. To improve the thermal conduction between the heating element 14 and the fastening element 16, it is possible to have between the heating element 14 and the zone 23 applied against the heating element 14 for the second branch 22, in addition to a thermo-conductive element 15 made of a very thermally conductive material. The electrical rail 8 and the heating element 14 are coated (overmolded) by injection, in common with a first injected envelope 28 made before the installation of the fixing element 16. During the production of the first injected envelope 28, the outer, contact surface of the heating element 14, facing the fixing element 16 has been left free to allow electrical contact between the contact surface of the heating element 14 and the fixing element. 16. After blocking of the electrical rail 8 and the heating element 14 on the fixing zone 24 of the heating element 5, the whole structure is injection-molded by applying a second injection 30 which ensures the tight closure to the liquid of the heating body 5, the electrical rail 8, 9, the heating element 14 and the fixing element 16 and in particular to protect it against the liquid reducing agent. Figure 5b is a section along the section line B-B of Figure 5a.
    [0011] The view shown in FIG. 5b clearly shows that the second branch 22 of the fixing element 16 surrounds, by protecting it, the heating element 16 and, if appropriate, a thermoconductive element 15 interposed between the heating element 16 and the second branch 22. The second branch 22 has in particular a U-shaped section and has a central zone 29c which is essentially parallel to the fixing zone 26 of the heating body 5 and to the heating element 14 being applied against the -this ; it has two lateral zones 29a, 29b which leave the central zone 29c at a substantially straight angle and bears against the fixing zone 26 of the heating body 5 so that the heating element 14 is completely surrounded by the second branch 22 The fixing element 16 thus protects the heating element 14 against the thrust exerted during the application of the second injected layer 30, which safely avoids damaging the heating element 14 under the effect of a force too important. Figure 6 shows in a perspective view the area of the fastener 16 shown on the right in Figure 5a; the side areas 29a, 29b surrounding the heating element 14 have not been shown.
    [0012] In the embodiment of Figure 6, the substantially straight lower zone 23 of the second branch 22 is ribbon-shaped with four strips 27a, 27b, 27c, 27d. The strips 27a, 27b, 27c, 27d are substantially parallel and directly adjacent. The realization of the lower zone 23 in the form of strips for the second branch 22 increases its flexibility which enables it to push the heating element 14 in a particularly effective and safe manner against the contact zone of the electric rail 8. For mounting, the heating element 14 is installed on the contact zone 9 of the electrical rail 8 and is coated by a first insulating layer 28, injected; at least one partial zone on the side of the heating element 14 opposite the contact zone 9 of the electrical rail 8 is left free for future contacting with the fixing element 16.
    [0013] In the following step, the fastening element 16 with its opening 32 is slid over the contact zone 9 of the electrical rail 8 and the heating element 14 so that the lower zone 23, the zones 27a, 27b, 27c, 27d lower, in the form of strips, the second branch 22 are applied against the heating element 14.
    [0014] The combination of the electrical rail 8, the heating element 14 and the fixing element 16 thus block the fastening zone 24 of the heating element 5 so that the first branch 20 of the fastening element 16 applies against the inclined side 25 of the attachment zone 24 as shown in Figure 5a.
    [0015] Thus, the heating element 14 is subjected to a guaranteed and predefined thrust by the fixing element 16, this thrust being sufficient to guarantee the electrical contact between the heating element 14 and the electrical rail 8 without risking damaging the heating element 14 in the contact zone 9 of the electrical rail 8.
    [0016] Figure 7 shows an alternative embodiment of a fastening element 16a according to the invention. In this variant, the first branch 20a shown to the left is substantially parallel to the lower right zone 23a of the second branch 22a shown on the right. The fixing element 16a shown in FIG. 7 is in particular provided for applications in which the fixing zone 24 of the heating body 5 does not have an inclined side 25. For the rest, the structure and the function of the element fasteners 16a shown in Figure 7 correspond essentially to those of the fastener 16 shown in Figures 5 and 6.
    [0017] Figure 8 shows schematically a view of another embodiment of the fastening element 16b according to the invention which has a U-shape with two branches substantially parallel 20b, 22b. In particular, in its upper zone adjacent to the central zone 18b of the fixing element 16b, the second branch 22b has a bent zone 2b. The fastening element 16b shown in FIG. 8 and corresponding to a third exemplary embodiment, unlike the fastening elements 16, 16a according to the first and second exemplary embodiments, has no intrinsic prestressing. The fixing element 16b of the third exemplary embodiment is deformed during assembly by a suitable device, for example a press or the use of the electromagnetic pulse technique as represented by the dashed line, to push the element heating element 14 against the lower zone 9 of the electrical rail 8.20 NOMENCLATURE OF THE MAIN ELEMENTS 1 Tank 2 Heating device 3 Housing 4 Central zone 5 Heater 6 Comb fingers 7 Link zone 8 Electric rail 8a First branch 8b Second branch 9 Zone contact contact of the electrical rail 10 Clearance zone 11 First pole 12 Second pole 14 Heating element 15 Thermoconductive element 16, 16a, b Fixing element 18, 18a, b Middle zone 19 Hook-shaped zone 20 First branch 20, 22a Branch starting from a central zone 21, 21a, b Arched zone 22, 22a, b Second branch 23, 23a Lower zone / right zone of the second branch 24 Zon e of fastening of the heating body 25 Inclined surface 26 Protective projection 27a, b, c, d Tape / ribbon 28 First injection / overmolding coating 29a Side zone 29c Central zone 30 Second injected / injected layer 32, 32a Opening in the zone Central 18
    权利要求:
    Claims (5)
    [0001]
    CLAIMS 1 °) Heating device (2), in particular for heating a liquid reducing agent for the after-treatment of the exhaust gas comprising: at least one heating element (5) which has at least one free zone (10) for receiving at least one heating element (14), - at least one heating element (14) installed in the disengagement zone (10), and - at least one fixing element (16) for blocking the heating element fant (14) in the clearance zone (10).
    [0002]
    2) heating device (2) according to claim 1, characterized in that it comprises at least one electrical rail (8) which passes into the clearance zone (10), - the heating element (14) being connected to the electrical rail (8) and blocked by the fastening element (16) on the electrical rail (8).
    [0003]
    3) Heating device (2) according to claim 2, characterized in that the fastening element (16) has at least one opening (32) for guiding the heating element (14) and / or at least one zone (9) of the electric rail (8) by the fastening element (16).
    [0004]
    Heating device (2) according to claim 2, characterized in that the fastening element (16) has a central zone (18) and at least two branches (20, 22) which extend from the central zone ( 18) at a certain angle, including a substantially straight angle.
    [0005]
    Heating device (2) according to Claim 4, characterized in that a limb (22) of the fastening element (16) bears against the heating element (14) when the fastening element (16) blocks the heating element (14) .6 °) Heating device (2) according to claim 5, characterized by a thermo-conductive element (15) between the branch (22) and the heating element (16). 14), this element (15) being made of a thermally conductive material. 7 °) heating device (2) according to claim 4 or 5, characterized in that at least one of the branches (22) comprises a plurality of strips (27a, 27b, 27c, 27d) parallel. 8 °) heating device (2) according to claim 1, characterized in that the heating body (5), the electric rail (8), the heating element (14) and the fixing element (16) are embedded in an injected material (30). 9 °) Method for mounting a heating element on a heating body (5), in particular for heating a liquid reducing agent for the aftertreatment of the exhaust gases and comprising at least one clearance zone (10) for receiving the heating element (14), characterized by the following steps: - placing the heating element (14) on an electric rail (8), - fixing the heating element (14) to the electric rail (8). using an elastic fastening element (16), and - introducing the heating element (14) and at least one zone of the electric rail (8) into the clearance zone (10) formed in the heating element (5). ). The method of claim 9, characterized in that the method further comprises the step of injection molding the heating body (5), the electric rail (8), the heating element (14) and the fastening element (16) with an injected material (30).
    类似技术:
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    同族专利:
    公开号 | 公开日
    FR3021996B1|2019-05-24|
    DE102014210799A1|2015-12-17|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE102012213417A1|2012-07-31|2014-02-06|Robert Bosch Gmbh|Heating device for an operating / auxiliary substance with compensating element|DE102015120250B3|2015-11-23|2017-04-13|Eichenauer Heizelemente Gmbh & Co. Kg|Method for producing a tank heater and tank heater|
    DE102016213411A1|2016-07-22|2018-01-25|Robert Bosch Gmbh|Function unit for a reducing agent storage tank and reducing agent storage tank|
    DE102016215366A1|2016-08-17|2018-02-22|Robert Bosch Gmbh|Method and device for pressurizing a reducing agent|
    DE102018212606A1|2018-07-27|2020-01-30|Robert Bosch Gmbh|heater|
    DE102019109482A1|2019-04-10|2020-10-15|Eichenauer Heizelemente Gmbh & Co. Kg|Heater|
    法律状态:
    2016-06-21| PLFP| Fee payment|Year of fee payment: 2 |
    2017-06-21| PLFP| Fee payment|Year of fee payment: 3 |
    2018-03-30| PLSC| Search report ready|Effective date: 20180330 |
    2018-06-25| PLFP| Fee payment|Year of fee payment: 4 |
    2020-06-23| PLFP| Fee payment|Year of fee payment: 6 |
    2021-06-22| PLFP| Fee payment|Year of fee payment: 7 |
    优先权:
    申请号 | 申请日 | 专利标题
    DE102014210799.7|2014-06-05|
    DE102014210799.7A|DE102014210799A1|2014-06-05|2014-06-05|heater|
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