Impingement baffle for a gas turbine engine and gas turbine engine

Abstract

An impingement baffle for a gas turbine engine is provided. The impingement baffle is a one piece impingement ring with one opening and with fastening elements at both free ends of the impingement ring to enable the closing of the impingement ring. A gas turbine engine including at least one such an impingement baffle is also provided.

Claims

1. An impingement baffle for a gas turbine engine, comprising: a fastening element at both of two free ends, wherein the impingement baffle is a one piece impingement ring, the one piece impingement ring being a split ring that is split at a single location, and wherein the fastening element enables the closing of the impingement ring, wherein a first fastening element comprises a male connection flap and a second fastening element comprises a female connection flap, and wherein the male connection flap and the female connection flap are arranged at a first free end of the impingement ring and overlap with complementary connection flaps arranged at a second free end of the impingement ring.

2. The impingement baffle as claimed in claim 1, wherein the impingement ring is elastic.

3. The impingement baffle as claimed in claim 2, wherein the impingement ring is spring-elastic.

4. The impingement baffle as claimed in claim 1, wherein the fastening elements comprise a locking device for assembling the fastening elements of both of two free ends to each other.

5. The impingement baffle as claimed in claim 4, wherein the locking device is a hook at a first fastening element at a first free end and a recess for engaging the hook at a second fastening element at a second free end.

6. The impingement baffle as claimed in claim 1, wherein each fastening element comprises an elongated beam whereby the elongated beam of each free end is arranged parallel and displaced to each other.

7. The impingement baffle as claimed in claim 6, wherein the male connection flap is located at a first free end of the elongated beam of the first fastening element, and wherein the female connection flap is located in an area where the elongated beam arises from a main body of the impingement ring.

8. The impingement baffle as claimed in claim 6, wherein the elongated beam of the first fastening element of the first free end may be slid on the elongated beam of the second fastening element of the second free end.

9. The impingement baffle as claimed in claim 1, wherein the impingement ring comprises a plurality of holes.

10. The impingement baffle as claimed in claim 1, wherein impingement ring is laser manufactured, and wherein the fastening elements of the impingement ring are laser manufactured.

11. The impingement baffle as claimed in claim 1, wherein fastening elements are each aligned along the respective free ends of the impingement ring such that once the impingement ring is closed it has a cylindrical inner surface without any elevation.

12. The impingement baffle as claimed in claim 1, wherein at each free end of the impingement ring at least a male and at least a female connection flaps are arranged.

13. The impingement baffle for a gas turbine engine as claimed in claim 1 wherein the fastening element of the first free end can slide on the fastening element of the second free end.

14. A gas turbine engine, comprising: an impingement baffle, comprising: a fastening element at both of two free ends, wherein the impingement baffle is a one piece impingement ring, the one piece impingement ring being a split ring that is split at a single location, and wherein the fastening element enables the closing of the impingement ring, wherein a first fastening element comprises a male connection flap and a second fastening element comprises a female connection flap, and wherein the male connection flap and the female connection flap are arranged at a first free end of the impingement ring and overlap with complementary connection flaps arranged at a second free end of the impingement ring.

15. The gas turbine as claimed in claim 14, wherein the impingement ring is elastic.

16. The gas turbine as claimed in claim 15, wherein the impingement ring is spring-elastic.

17. The gas turbine engine as claimed in claim 14 wherein the fastening element of the first free end can slide on the fastening element of the second free end.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention will now be described again in detail with reference to the enclosed figure, wherein:

(2) FIG. 1 shows schematically a perspective view of one embodiment of an impingement ring constructed according to the invention,

(3) FIG. 2 shows schematically a perspective view of an enlarged cut-out of the free ends and the fastening elements of the impingement ring according to FIG. 1,

(4) FIG. 3 shows schematically a side view of the free ends and the fastening elements of the impingement ring according to FIG. 1,

(5) FIG. 4 shows schematically a cross-sectional view of one free end of the impingement ring according to FIG. 1.

(6) Elements with the same function and mode of operation are provided in the FIG. 1 to 4 with the same reference signs.

DETAILED DESCRIPTION OF INVENTION

(7) FIG. 1 shows schematically a perspective view of one possible embodiment of an impingement baffle 1, which is an impingement ring 2, constructed according to the invention. The impingement ring 2 has a one-piece main body 7 and a single opening 3.

(8) FIG. 2 shows schematically a perspective view of an enlarged cut-out of the free ends 6a, 6b and the fastening elements 4, 5 of the impingement ring 2 according to FIG. 1. The impingement ring 2 has one opening 3. The free ends 6a, 6b of the impingement ring 2 are opposed to each other. At each of the free ends 6a, 6b two fastening element 4, 5 are arranged. The fastening elements 4, 5 of the first free end 6a and the fastening elements 4, 5 of the second free end 6b are mating elements. The fastening elements 4, 5 at the first free end 6a fit to the fastening elements 4, 5 at the second free end 6b of the impingement ring 2. Advantageously the fastening elements 4, 5 at the first free end 6a can be slit on the fastening elements 4, 5 at the second free end 6b of the impingement ring 2. Each fastening element 4, 5 comprise a beam 10 which is arranged at the main body 7 of the impingement ring 2.

(9) Advantageously, the fastening elements 4, 5 are arranged aligned to the free ends 6a, 6b of the impingement ring 2. That means the fastening elements 4, 5 are in this embodiment of the impingement baffle 1 an elongation of the main body 7 of the impingement ring 2.

(10) A first fastening element 4 of each free end 6a, 6b comprises a male connection flap 41 and a second fastening element 5 of each free end 6a, 6b comprises a female connection flap 51. The male connection flaps 41 and the female connection flaps 51 can mate with each other, namely in the way that the impingement ring stays closed after assembling the male connection flaps 41 and the female connection flaps 51 together. The male connection flaps 41 intertwine form-closed with the female connection flaps 51.

(11) Once closed, the impingement ring 2 may result in a cylindrical inner surface without any elevations. The outer surface may be cylindrical with an elevation radially outwards where the free ends 6a, 6b mate.

(12) In this embodiment of the impingement baffle 1 there is a smooth transition at the inner lateral area and a smooth transition at the outer lateral area of the impingement ring 2.

(13) The impingement ring 2 or the fastening elements 4, 5 of the both free ends 6a, 6b of the impingement ring 2 can be assembled in the same way as a belt, joining the fastening elements 4, 5, in particular the connection flaps 41, 51, together.

(14) Each fastening element 4, 5 comprise an elongated beam 10. The beams 10 at one free end 6a, 6b are arranged parallel and displaced to each other. In this preferred embodiment of the impingement baffle 1 both of the free ends 6a, 6b of the impingement ring 2 comprise two elongated beams 10. Each beam 10 arises from the main body 7 of the impingement ring 2. One of the beams 10 may be elevated in respect to the main body 7 of the impingement ring 2 or in respect another beam 10 at one free end 6a, 6b. The beam 10 may be substantially parallel to the main body 7. Between two beams 10 at one free end 6a, 6b of the impingement ring 2 a gap or an elongated slot is formed. The two beams 10 of the first free end 6a of the impingement ring 2 can be slid on, in particular form-shaped, the two beams 10 of the second free end 6b of the impingement ring 2. The beams 10 at the free ends 6a, 6b and the main body 7 of the impingement ring 2 are made of one piece. Advantageously the beams 10 and the main body 7 of the impingement ring 2 are being monolithic construction.

(15) The male connection flaps 41 are located at the free ends of the elongated beams 10 and the female connection flaps 51 are located in the areas 8, where an elongated beam 10 arises from the main body 7 of the impingement ring 2. The arrangement of the male connection flaps 41 and the female connection flaps 51 in this way allows an easy assembling of the connection flaps 41, 51 together.

(16) In FIG. 3, a schematic side view of the free ends 6a, 6b and the fastening elements 4, 5 of the impingement ring 2 according to FIG. 1 are shown. The impingement ring 2 has a plurality of holes 9 for allowing high pressure cooling air to pass through the body of impingement ring 2. Advantageously the impingement ring 2 is perforated with a plurality of holes 9. If not fastened, there is an opening 3 between the two free ends 6a, 6b. FIG. 3 shows the impingement ring 2 in a non-closed condition. Both free ends 6a, 6b have two fastening elements 4, 5. Each fastening element 4, 5 comprises an elongated beam 10. The elongated beams 10 at one free end 6a, 6b are arranged parallel and displaced to each other. Because of the specific complementary arrangement of the elongated beams 10 at the both free ends 6a, 6b the fastening elements 4, 5 of the first free end 6a can slide on the fastening elements 4, 5 of the second free end 6b.

(17) FIG. 4 shows schematically a cross section view of the first free end 6a of the impingement ring 2 according to FIG. 1. In the figure, the ring bends from left to right turning into the direction out of the drawing. A first fastening element 4 is directed substantially in the direction of the viewer. The impingement ring 2 is perforated with holes 9. The first fastening element 4 comprises a male connection flap 41 and a second fastening element 5 comprises a female connection flap 51. The connection flaps 41, 51 of this first free end 6a can overlaponce the impingement ring 2 is closedwith complementary connection flaps 41, 51 of a second free end 6b, which is not shown in this figure.

(18) The connection flaps 41, 51 provide an easy assembly operation and at the same time minimizing leakage as the connection flaps 41, 51 of both free ends 6a, 6b are in contact with each other. The impingement ring can be assembled in the same way as a belt, joining the connection flaps 41, 51 together.

(19) Cost effectiveness is gained through a design possible to laser cut in one operation and press the connection flaps 41, 51 and roll the ring shape.