Blow-off ring

Abstract

A blow-off ring for cleaning components of an electric motor includes a first ring element and a second ring element, where the first ring element and the second ring element can be assembled in order to enclose an annular cavity within the blow-off ring. The first ring element and/or the second ring element has nozzles which are connected to the annular cavity and which extend along an inner circumferential surface and/or an outer circumferential surface of the blow-off ring.

Claims

1. A blow-off ring for cleaning a component of an electric motor, comprising: a first ring element; a second ring element, wherein the first ring element and the second ring element are fixable to each other and wherein the first ring element and the second ring element define an annular cavity within the blow-off ring when fixed to each other; and an air inlet, wherein air is suppliable to the annular cavity by the air inlet; wherein the first ring element and/or the second ring element has nozzles which are connected to the annular cavity at a first end and which point out of an inner circumferential surface and/or an outer circumferential surface of the blow-off ring at a second end such that the air is blowable out through the inner circumferential surface and/or the outer circumferential surface of the blow-off ring and onto the component of the electric motor and wherein the component is a stator; wherein both the first ring element and the second ring element have a stepped profile with an L-shaped outer surface and a stepped inner surface and wherein when the first ring element is fixed to the second ring element the respective stepped profiles interengage with each other.

2. The blow-off ring as claimed in claim 1, wherein the nozzles are in a form of a bore within the first ring element and/or the second ring element.

3. The blow-off ring as claimed in claim 2, wherein the first end of the bore has a larger diameter than the second end of the bore.

4. The blow-off ring as claimed in claim 1, wherein either the first ring element or the second ring element has the nozzles.

5. The blow-off ring as claimed in claim 1, wherein the first ring element and the second ring element each have at least two seal receptacles and wherein respective seals are arrangeable in the at least two seal receptacles for sealing off the annular cavity.

6. The blow-off ring as claimed in claim 2, wherein the first ring element and the second ring element each have at least two seal receptacles and wherein respective seals are arrangeable in the at least two seal receptacles for sealing off the annular cavity.

7. The blow-off ring as claimed in claim 3, wherein the first ring element and the second ring element each have at least two seal receptacles and wherein respective seals are arrangeable in the at least two seal receptacles for sealing off the annular cavity.

8. The blow-off ring as claimed in claim 1, wherein the first ring element and/or the second ring element are manufactured from aluminum and/or steel.

9. The blow-off ring as claimed in claim 8, wherein the steel is stainless steel.

10. A blow-off apparatus, comprising: an inner blow-off ring according to claim 1; and an outer blow-off ring according to claim 1; wherein the inner blow-off ring has an outside diameter which is smaller than an inside diameter of the outer blow-off ring; wherein the inner blow-off ring is disposed within the outer blow-off ring; wherein a stator of an electric motor is passable through the blow-off apparatus between the inner blow-off ring and the outer blow-off ring.

11. The blow-off apparatus as claimed in claim 10, wherein the inner blow-off ring is disposed concentrically in relation to the outer blow-off ring.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 shows a schematic view of an inner first ring element of an inner blow-off ring according to an exemplary embodiment of the invention.

(2) FIG. 2 shows a schematic view of an inner second ring element of the inner blow-off ring according to the exemplary embodiment of the invention.

(3) FIG. 3 shows a schematic sectional view of the inner first ring element of the inner blow-off ring according to the exemplary embodiment of the invention.

(4) FIG. 4 shows a first schematic view of a detail of the inner first ring element of the inner blow-off ring according to the exemplary embodiment of the invention.

(5) FIG. 5 shows a second schematic view of a detail of the inner first ring element of the inner blow-off ring according to the exemplary embodiment of the invention.

(6) FIG. 6 shows a schematic view of the inner blow-off ring according to the exemplary embodiment of the invention.

(7) FIG. 7 shows a schematic view of a portion of the inner blow-off ring according to the exemplary embodiment of the invention.

(8) FIG. 8 shows a schematic view of an outer first ring element of an outer blow-off ring according to an exemplary embodiment of the invention.

(9) FIG. 9 shows a schematic view of an outer second ring element of the outer blow-off ring according to the exemplary embodiment of the invention.

(10) FIG. 10 shows a schematic sectional view of the outer first ring element of the outer blow-off ring according to the exemplary embodiment of the invention.

(11) FIG. 11 shows a first schematic view of a detail of the outer first ring element of the outer blow-off ring according to the exemplary embodiment of the invention.

(12) FIG. 12 shows a second schematic view of a detail of the outer first ring element of the outer blow-off ring according to the exemplary embodiment of the invention.

(13) FIG. 13 shows a schematic view of the outer blow-off ring according to the exemplary embodiment of the invention.

(14) FIG. 14 shows a schematic view of a portion of the outer blow-off ring according to the exemplary embodiment of the invention.

(15) FIG. 15 shows a schematic view of a blow-off apparatus according to an exemplary embodiment of the invention.

DETAILED DESCRIPTION OF THE DRAWINGS

(16) FIG. 1 schematically shows an inner first ring element 4. The inner first ring element 4 is part of an inner blow-off ring 1 according to an exemplary embodiment of the invention which is shown in FIGS. 6 and 7.

(17) The inner first ring element 4 advantageously has a stepped profile with an L-shaped outer surface and a stepped inner surface. Therefore, the inner first ring element 4 has, in particular, two outer walls. A large number of bores are arranged in an outer circumferential surface 11, so that the outer circumferential surface 11 has a large number of nozzles 9. The nozzles will be described in more detail below with reference to FIGS. 3 to 5.

(18) Owing to the nozzles 9, it is possible for air to be blown out of the outer circumferential surface 11 of the inner first ring element 4. To this end, fresh air can be supplied via an air inlet 17. The air inlet 17 serves to supply air to an annular cavity 8. The annular cavity 8 is created by an inner second ring element 6 being combined with the inner first ring element 4. The inner second ring element 6 is illustrated in FIG. 2.

(19) As is clear from FIG. 2, the inner second ring element 6 also has a stepped profile with an L-shaped outer surface and a stepped inner surface. If the inner first ring element 4 and the inner second ring element 6 are combined, the stepped profiles interengage. This leads to the described cavity 8 being delimited from the surrounding area. The cavity 8 is connected to an outer surrounding area of the inner first element 4 and of the inner second ring element 6, in particular, only by the nozzles 9 and by the air inlet 17.

(20) In order to ensure that a fluid which is supplied to the cavity 8 via the air inlet 17 leaves the cavity 8 only via the nozzles 9, the inner first ring element 4 has two seal receptacles 14. The seal receptacles 14 serve to receive in each case one seal, in particular in each case one O-ring, so that the cavity 8 is sealed off from an outer surrounding area. In particular, this prevents a fluid which is present within the cavity 8 from being able to escape through assembly points between the inner first ring element 4 and the inner second ring element 6.

(21) FIG. 3 schematically shows a sectional view through the inner first ring element 4. FIG. 3, in particular the region marked as detail C, which is illustrated in FIG. 4, shows that the seal receptacles 14 comprises a U-shaped recess. Therefore, it is possible to seal off the inner first ring element 4 from the inner second ring element 6.

(22) FIG. 3 also shows the construction of the nozzles 9. For example, a nozzle 9 is shown in the region marked as detail D, which is illustrated in FIG. 5. The nozzles 9 are realized by a bore through a wall of the inner first ring element 4, wherein the bore comprises a first bore 20 and a second bore 21. The first bore 20 and the second bore 21 are, in particular, of colinear design and therefore have the same center axis. Provision is made for the first bore 20 to have a smaller diameter than the second bore 21. The second bore 21 adjoins the cavity 8, while the first bore 20 points out of the first blow-off ring 1.

(23) Owing to the second bore 21, it is easier to clean the nozzles 9 on account of the increased diameter. A characteristic of the nozzles 9 can be set by the first bore 20. In particular, an outflow direction and also an outflow rate can be defined by means of the first bore 20.

(24) FIG. 1 also shows that the inner first ring element 4 has threaded bores 18. It is clear from FIG. 2 that the inner second ring element 6 has corresponding passage bores 19. The passage bores 19 and the threaded bores 18 serve to fix the inner first ring element 4 and the inner second ring element 6 to one another. This is clear from FIGS. 6 and 7.

(25) FIG. 6 shows a schematic view of an inner blow-off ring 1 which is made up of the inner first ring element 4 and the inner second ring element 6, as shown in FIGS. 1 and 2. FIG. 7 shows the same inner blow-off ring 1, wherein only the inner second ring element 6 and the seals which are present in the seal receptacles 14 are not shown.

(26) It is clear that the inner first ring element 4 and the inner second ring element 6 are fixed to one another by screws 16. The screws 16 are passed through the passage bores 19 and screwed within the threaded bores 18. In order to avoid fluid outlet from the cavity 8 through the threaded bores 18, either a sealing means and/or a Teflon strip can be used here. In order to prevent fluid being let out from the cavity 8 through the passage bores 19, a seal disk 15 is provided. This ensures that fluid, which passes through the air inlet 17 into the cavity 8, can leave the cavity 8 solely via the nozzles 9.

(27) Owing to the screw-connection by means of the screws 16, the inner blow-off ring 1 can be disassembled into the inner first ring element 4 and the inner second ring element 6 at any time. After the disassembly, the nozzles 9 can be reached from both sides, that is to say both from the first bore 20 and also from the second bore 21. In this way, the nozzles 9 can be cleaned simply and with little expenditure. Provision is particularly advantageously made for the inner blow-off ring 1 to be manufactured from a stainless steel, so that chemical cleaning of the nozzles 9 is also possible, without the inner blow-off ring being damaged in the process.

(28) FIG. 8 shows an outer first ring element 5 of an outer blow-off ring 2 according to an exemplary embodiment of the invention. FIG. 9 shows an outer second ring element 7 of the outer blow-off ring 2. FIGS. 10 to 12 show different sectional views through the outer first ring element 5. Finally, FIGS. 13 and 14 show the outer blow-off ring 2 itself.

(29) FIG. 8 shows the same as FIG. 1 in respect of functioning. Similarly, FIG. 9 shows the same as FIG. 2 in respect of functioning. FIG. 10 shows the same as FIG. 3 in respect of functioning, while FIGS. 11 and 12 show the same as FIGS. 4 and 5 in respect of functioning. Finally, FIGS. 13 and 14 show the same as FIGS. 6 and 7 in respect of functioning. Therefore, the above description of FIGS. 1 to 7 is also applicable to FIGS. 8 to 14, where only the term inner blow-off ring 1 is to be replaced by the term outer blow-off ring 2, the term inner first ring element 4 is to be replaced by the term outer first ring element 5, the term inner second ring element 6 is to be replaced by the term outer second ring element 7, and finally the term outer circumferential surface 11 is to be replaced by the term inner circumferential surface 10.

(30) In contrast to the inner blow-off ring 1 in which fluid can be blown out of the outer circumferential surface 11 via the nozzles 9, fluid can be blown out of the inner circumferential surface 10 via the nozzles 9 by the outer blow-off ring 2. In principle, the construction and the manner of operation both of the inner blow-off ring 1 and of the outer blow-off ring 2 are identical.

(31) FIG. 15 schematically shows a blow-off apparatus 12 with which a stator 3 of an electric motor can be cleaned. The stator 3 is therefore considered to be a component of the electric motor. The blow-off apparatus 12 comprises an inner blow-off ring 1 and also an outer blow-off ring 2 as respectively described above and shown in FIGS. 1 to 14.

(32) The inner blow-off ring 1 is arranged concentrically in relation to the outer blow-off ring 2, wherein an outer diameter of the inner blow-off ring 1 is smaller than an inner diameter of the outer blow-off ring 2. Therefore, the stator 3 can be passed through between the inner blow-off ring 1 and the outer blow-off ring 2. During the process of passing the stator 3 through, the stator can be inserted between the nozzles 9 of the inner blow-off ring 1 and of the outer blow-off ring 2.

(33) The inner blow-off ring 1 is held by a web element 22. The outer blow-off ring 2 is fastened to an outer wall 23. In this case, provision is particularly advantageously made for web element 22 and outer wall 23 to jointly form a pot element 13. This pot element 13 can, in particular, replace the inner first ring element 4 or the inner second ring element 6 and additionally the outer first ring element 5 or the outer second ring element 7. The resin which is blown off from the stator 3 can be collected and in particular can be discharged from the pot element 13.

(34) Finally, it is clear that both the inner blow-off ring 1 and also the outer blow-off ring 2 can be supplied with fresh air via an air supply 24. The fresh air is supplied to the air inlets 17 via the air supply 24 and in this way enters the cavities 8 of the inner blow-off ring 1 and of the outer blow-off ring 2. From there, the fresh air is routed through the nozzles 9 to the stator 3 for cleaning purposes.

(35) It is clear that, on account of the stable construction in particular of the outer blow-off ring 2, the outer wall 23 is also stable and cannot be deformed. Therefore, the outer wall 23 itself can also be manufactured from a relatively thin metal sheet. Therefore, simple and cost-effective construction of the blow-off apparatus 12 is rendered possible.

LIST OF REFERENCE SYMBOLS

(36) 1 Inner blow-off ring 2 Outer blow-off ring 3 Stator 4 Inner first ring element 5 Outer first ring element 6 Inner second ring element 7 Outer second ring element 8 Cavity 9 Nozzle 10 Inner circumferential surface 11 Outer circumferential surface 12 Blow-off apparatus 13 Pot element 14 Seal receptacle 15 Seal disk 16 Screw 17 Air inlet 18 Threaded bore 19 Passage bore 20 First bore 21 Second bore 22 Web element 23 Outer wall 24 Air supply

(37) The foregoing disclosure has been set forth merely to illustrate the invention and is not intended to be limiting. Since modifications of the disclosed embodiments incorporating the spirit and substance of the invention may occur to persons skilled in the art, the invention should be construed to include everything within the scope of the appended claims and equivalents thereof.