Injector having a reinforced spray disc

Abstract

An injector for adding a liquid additive into an exhaust gas treatment apparatus includes at least one nozzle having a spray disc configured to inject the liquid additive into the exhaust gas treatment apparatus. The spray disc has: at least one spray duct, through which flow of the liquid additive can pass, the spray duct having an outlet opening configured to shape a spray jet of the liquid additive. The spray disc has a reinforcing structure arranged downstream of the outlet opening, the reinforcing structure being configured such that it is not wetted by the spray jet.

Claims

1. An injector (1) for adding a liquid additive (2) into an exhaust gas treatment apparatus (3), the injector (1) comprising: at least one nozzle (5) having a spray disc (4) configured to inject the liquid additive (2) into the exhaust gas treatment apparatus (3), the spray disc (4) having: at least one spray duct (6), through which flow of the liquid additive (2) can pass, the at least one spray duct (6) having an outlet opening (7) configured to shape a spray jet (8) of the liquid additive (2), wherein the spray disc (4) has a reinforcing structure (9) arranged downstream of the outlet opening (7), the reinforcing structure (9) being configured such that it is not wetted by the spray jet (8), and wherein the at least one spray duct (6) has, upstream of the outlet opening (7), a first duct section (13) and has, downstream of the outlet opening (7), a second duct section (14), the first duct section (13) having a first duct cross section (15), and the second duct section (14) having a second duct cross section (12) wider than the first duct cross section (15), the second cross section (12) widening from the first duct cross section (15) without graduation.

2. The injector as claimed in claim 1, wherein the reinforcing structure (9) comprises a reinforcing section (10) of the spray disc (4), the at least one spray duct (6) extending through the reinforcing section (10), as viewed in a flow direction (11), from the outlet opening (7).

3. The injector as claimed in claim 1, wherein the reinforcing structure (9) comprises a supporting disc (16), the supporting disc (16) and the spray disc (4) being connected to one another, the at least one spray duct (6) extending through the supporting disc (16), as viewed in a flow direction (11), from the outlet opening (7).

4. The injector as claimed in claim 3, wherein the spray disc (4) and the supporting disc (16) are connected to one another in an integrally joined manner.

5. The injector as claimed in claim 1, wherein the first duct section (13) has a first section length (17), and the second duct section (14) has a second section length (18), and a ratio of the first section length (17) to the second section length (18) is less than or equal to 1.

6. The injector as claimed in claim 1, further comprising a compensation element (19) arranged in the injector (1).

7. The injector as claimed in claim 1, further comprising at least one fluid distribution structure (20) arranged in the spray disc (4) upstream of the at least one spray duct (6).

8. The injector as claimed in claim 1, wherein the second duct section (14) is oriented eccentrically with respect to the first duct section (13).

9. A motor vehicle (23) comprising: an internal combustion engine (24); an exhaust gas treatment apparatus (3) configured to purify exhaust gases of the internal combustion engine (24); and the injector (1) as claimed in claim 1 configured to add the liquid additive (2) into the exhaust gas treatment apparatus (3).

10. An injector (1) for adding a liquid additive (2) into an exhaust gas treatment apparatus (3), the injector (1) comprising: at least one nozzle (5) having a spray disc (4) configured to inject the liquid additive (2) into the exhaust gas treatment apparatus (3), the spray disc (4) having: at least one spray duct (6), through which flow of the liquid additive (2) can pass, the at least one spray duct (6) having an outlet opening (7) configured to shape a spray jet (8) of the liquid additive (2), wherein the spray disc (4) has a reinforcing structure (9) arranged downstream of the outlet opening (7), the reinforcing structure (9) being configured such that it is not wetted by the spray jet (8), and wherein the at least one spray duct (6) has, upstream of the outlet opening (7), a first duct section (13) and has, downstream of the outlet opening (7), a second duct section (14), the first duct section (13) having a first duct cross section (15), and the second duct section (14) having a second duct cross section (12) wider than the first duct cross section (15), a ratio of the first duct cross section (15) to the second duct cross section (12) being less than 0.8.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention and the technical environment will be described in greater detail in the following text using the Figures. The Figures show particularly preferred exemplary embodiments, to which the invention is not restricted, however. It is to be noted, in particular, that the Figures and, in particular, the proportions which are shown are merely diagrammatic. In the Figures, diagrammatically:

(2) FIG. 1 shows a sectional illustration of an injector;

(3) FIG. 2 shows a sectional illustration of a spray disc;

(4) FIG. 3 shows a sectional illustration of a further spray disc;

(5) FIG. 4 shows a sectional illustration of yet another spray disc;

(6) FIG. 5 shows a view from below of a spray disc;

(7) FIG. 6 shows a view from above of a spray disc; and

(8) FIG. 7 shows a motor vehicle having an injector.

DETAILED DESCRIPTION OF THE PRESENTLY PREFERRED EMBODIMENTS

(9) FIG. 1 shows a sectional illustration of an injector 1. The injector 1 has a nozzle 5 formed by a spray disc 4 for injecting a liquid additive into the exhaust gas treatment apparatus. In addition, a compensation element 19 in the manner of an elastic sleeve is provided in the injector 1. The compensation element 19 is arranged in a connecting region 26 of the injector 1.

(10) FIG. 2 shows a sectional illustration of a spray disc 4. The spray disc 4 has two spray ducts 6, through which flow can pass, with in each case one outlet opening 7. It can be seen that the spray disc 4 is formed downstream of the outlet openings 7 by a reinforcing structure 9. As a result, the spray disc 4 is reinforced on its underside by the reinforcing structure 9, with the result that the spray disc 4 can withstand even high ice pressures in the injector 1.

(11) Here, the spray disc 4 is formed in two parts, the outlet openings 7 lying in an imaginary dividing plane of the spray disc 4.

(12) In accordance with the illustration according to FIG. 2, the reinforcing structure 9 is formed by a supporting disc 16, the supporting disc 16 and the spray disc 4 being connected fixedly to one another. Here, the spray ducts 6 extend through the supporting disc 16, as viewed in a flow direction 11, from the outlet opening 7, and have a duct cross section 12 widened suddenly there in comparison with a first duct section 13.

(13) The spray ducts 6 are formed upstream of the outlet openings 7 in each case by a first duct section 13 and downstream of the outlet openings 7 in each case by a second duct section 14. The first duct section 13 has a reduced duct cross section 15, and the second duct section 14 has a widened duct cross section 12. In addition, the first duct section 13 has a first section length 17, and the second duct section 14 has a second section length 18. A fluid distribution structure 20 is formed in the spray disc 4 upstream of the respective spray duct 6, through which fluid distribution structure 20 the liquid additive can be introduced into the spray ducts 6.

(14) FIG. 3 shows a sectional illustration of a spray disc 4 formed in one part or in one piece. Here, the reinforcing structure 9 is formed by a reinforcing section 10 of the spray disc 4. In other words, the spray disc 4 is already provided here per se from a (single) thick disc, the second duct sections 14 of the spray ducts 6 being formed in the reinforcing section 10 of the spray disc 4 in the manner of bores and/or recesses. This also means that the reinforcing structure 9 is not applied to a thin main disc here, but rather is machined out of a thick spray disc 4 by bores and/or recesses. In the region of the outlet openings 7, the spray ducts 6 are configured by a sudden cross-sectional widening, which forms a type of step 22.

(15) It can be seen in FIG. 3 that the second duct sections 14 are oriented eccentrically with respect to the respective associated first duct sections 13. This achieves a situation where the spray jet 8 of the additive 2 does not pass into direct contact with a duct inner face of the second duct section 14, although a spray jet 8 is deformed partially on account of the flowing exhaust gas 25. It is also possible here that the first duct sections 13 and/or the second duct sections 14 have widening or tapering cross sections.

(16) FIG. 4 shows a sectional illustration of a further spray disc 4 which can correspond, for example, to the spray disc from FIG. 3. FIG. 3 is not restricted, however, to spray discs having a sectional face in accordance with FIG. 4. The possible sectional plane is denoted by IV in FIG. 3 and lies in the region of the reinforcing section 10. The view is directed from below onto the step 22 and the outlet openings 7 here. Here, the spray disc 4 has a rectangular cross section by way of example. The step 22 and the outlet opening 7 of the spray duct 6 shown on the left hand side have a rectangular cross section by way of example. In contrast, the step 22 and the outlet opening 7 of the spray duct 6 shown on the right hand side are formed by way of example with an oval shape. It is to be noted that FIG. 4 is merely diagrammatic and shows two different spray duct shapes in order to illustrate different shapes. Actual spray discs usually have, in each case, only one defined type of duct shapes.

(17) FIG. 5 shows a view from below of a spray disc 4. The spray disc 4 is formed on the underside by a reinforcing structure 9. Here, the reinforcing structure 9 is formed by way of example by four reinforcing ribs, the reinforcing ribs being shown in a sectioned manner here. Since the view is directed from below onto the spray disc 4, outlet openings 7 can also be seen.

(18) FIG. 6 shows a view from above onto a spray disc 4. A fluid distribution structure 20 is formed in the spray disc 4 in an upper region. Here, the fluid distribution structure 20 is configured with two arcuate recesses. It is shown that each of the recesses connects three spray ducts 6 to one another. In other words, in each case three spray ducts 6 extend from a recess of the fluid distribution structure 20 into the spray disc 4 and through the spray disc 4.

(19) FIG. 7 shows a motor vehicle 23, at least having an internal combustion engine 24, and an exhaust gas treatment apparatus 3 for purifying the exhaust gases of the internal combustion engine 24, an injector 1 for adding the liquid additive being provided on the exhaust gas treatment apparatus 3.

(20) Thus, while there have been shown and described and pointed out fundamental novel features of the invention as applied to a preferred embodiment thereof, it will be understood that various omissions and substitutions and changes in the form and details of the devices illustrated, and in their operation, may be made by those skilled in the art without departing from the spirit of the invention. For example, it is expressly intended that all combinations of those elements and/or method steps which perform substantially the same function in substantially the same way to achieve the same results are within the scope of the invention. Moreover, it should be recognized that structures and/or elements and/or method steps shown and/or described in connection with any disclosed form or embodiment of the invention may be incorporated in any other disclosed or described or suggested form or embodiment as a general matter of design choice. It is the intention, therefore, to be limited only as indicated by the scope of the claims appended hereto.